AstroWeb: High Energy Astrophysics

1st High Energy Astrophysics Observatory (HEAO 1. GSFC. NASA)

The first of NASA's three High Energy Astronomy Observatories, HEAO 1 was launched aboard an Atlas Centaur rocket on 12 August 1977 and operated until 9 January 1979. During that time, it scanned the X-ray sky almost three times over 0.2 keV - 10 MeV, provided nearly constant monitoring of X-ray sources near the ecliptic poles, as well as more detailed studies of a number of objects through pointed observations.

http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/heao1.html

2nd High Energy Astrophysics Observatory (HEAO 2, renamed Einstein. GSFC. NASA)

The second High Energy Astronomy Observatory (HEAO-B) was launched into an approximate 100-min low Earth orbit on 13 November 1978. Renamed the Einstein Observatory, it operated (with one significant interruption) until April 1981 and made over 5,000 targeted observations.

http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/heao2.html

All-sky Low Energy Gamma Ray Observatory (ALEGRO)

ALLEGRO is a proposed MidEx class instrument providing all-sky monitoring of low-energy gamma-rays at unprecedented sensitivity. Unlike previous hard X-ray experiments, there is no time-averaging, data-selection, or triggering on-board: ALLEGRO transmits all events, time-tagged to 1/8th ms and with full energy information. This produces a database of uniformly high resolution in both energy and time, permitting non-triggered, unbiased detection of transient and pulsed events.

http://www.astro.nwu.edu/astro/allegro

Antarctic Muon and Neutrino Detector Array (AMANDA)

http://amanda.berkeley.edu/

Astrophysics Data System Archive Service (ADS Archive)

This service provides access and search capability to Einstein Observatory Data, including the 29 CDROMs released by the Einstein Observatory project at the Smithsonian Astrophysical Observatory. These data include image files and photon event list files from the Image Proportional Counter (IPC) and the High Resolution Imager (HRI) instruments.

http://adsarc.harvard.edu/einstein_service.html

Astrophysics and Radiation Measurements Group

The interests in astrophysics of the Astrophysics and Radiation Measurements Group (NIS-2) focus on gamma-ray bursts, x-ray binaries, accretion- and rotation-powered pulsars, neutron star dynamics, atomic processes in astrophysical sources, soft x-ray and EUV backgrounds, and EUV and soft x-ray transients such as flare stars. An important mission of the group is to develop new types of optical, ultraviolet, x-ray and gamma-ray detectors for ground and space applications. The group has flown high-energy instruments on Pioneer Venus Orbiter, the ISEE-3 (ICE), P78-1, Vela satellites, and the Japanese satellite Ginga. The group is currently developing experiments for several scientific missions including the X-ray Multimirror Mission (XMM), High Energy Transient Explorer (HETE), MARS-96, and the MOXE all sky x-ray monitor on the Russian Spectrum X-Gamma satellite project, and is the lead institution operating the Array of Low Energy X-ray Imaging Sensors (ALEXIS) satellite and its wide field-of-view ultrasoft x-ray telescope array. The group is actively participating in Compton Gamma Ray Observatory (CGRO) and Rossi X-ray Timing Explorer (RXTE) research through several guest investigator projects, and is also involved in establishing the growing-up Fenton Hill Observatory in the Jemez mountains, which includes an ultra-high-energy gamma-ray telescope, Milagro.

http://nis-www.lanl.gov/nis2astro.html

BeppoSAX Mission (SAX)

The X-ray astronomy satellite BeppoSAX (Satellite per Astronomia X "Beppo" in honor of Giuseppe Occhialini) is a project of the Italian Space Agency (ASI) with participation of the Netherlands Agency for Aerospace Programs (NIVR).
In the framework of past and future X-ray missions BeppoSAX stands out for its wide spectral coverage, ranging from 0.1 to over 200 keV. The sensitivity of the scientific payload allows the detailed study over the entire energy band of sources as weak as about 1/20 of 3C273. This opens new perspectives in the study of broad band X-ray spectra and variability of cosmic sources.

http://www.sdc.asi.it/

Berkeley - Space Sciences Laboratory

HEAD The High Energy Astrophysics Division of the American Astronomical Society. SPRG The Space Physics Research Group. SERENDIP The Search for Extraterrestrial Radio Emissions from Nearby Developed Intelligent Populations. HOU The Hands-On Universe Program. COBE The Cosmic Background Explorer. EAG The Experimental Astrophysics Group. ISI The Infrared Spatial Interferometer Group. CEA The Center for Extreme Ultraviolet Astrophysics. ORFEUS The Orbiting Retrievable Far and Extreme Ultraviolet Spectrometers and The Berkeley Spectrometer.

http://ssl.berkeley.edu/

Broad Band X-ray Telescope (BBXRT. GSFC. NASA)

The Broad Band X-ray Telescope (BBXRT) was flown on the space shuttle Columbia (STS-35) on 1990 December 2-December 11, as part of the ASTRO-1 payload. The flight of BBXRT marked the first opportunity for performing X-ray observations over a broad energy range (0.3-12 keV) with a moderate energy resolution (typically 90 eV and 150 eV at 1 and 6 keV, respectively).

http://heasarc.gsfc.nasa.gov/docs/bbxrt/bbxrt_menu.html

CASS - High Energy Astrophysics

http://mamacass.ucsd.edu:8080/

CERN Hybrid Oscillation Research apparatUS (CHORUS)

http://choruswww.cern.ch/Public/welcome1.html

CHIANTI: A database for astrophysical emission line spectroscopy (CHIANTI)

CHIANTI is a database that contains the most accurate data available for the calculation of emission line intensities as a function of both temperature and density. The database is essentially complete for wavelengths greater than 50 Angstroms and is to be extended to shorter wavelength. A library of IDL procedures is included.

http://wwwsolar.nrl.navy.mil/chianti.html

CLOUDY - Photoionization Simulation code (CLOUDY)

Cloudy is a large-scale Fortran code designed to simulate physical conditions in a broad range of astronomical plasmas, and predict its resulting spectrum. The Cloudy homepage provides pointers to the code and its documentation, along with related publications and activities.

http://www.pa.uky.edu/~gary/cloudy

Cambridge X-Ray Astronomy Group (IoA, Cambridge)

Home page of the X-Ray Astronomy Group at the Instittue of Astronomy, University of Cambridge. This server provides information on the Group's research activities and links to other useful astronomical WWW sites.

http://www-xray.ast.cam.ac.uk/

Chandra X-Ray Observatory - Public Information & Education

This site provides current information on the "hot" field of X-ray astronomy and the Chandra mission, NASA's Great Observatory. Chandra is designed for detecting X-rays from cosmic sources such as black holes, and exploding stars and galaxies.

http://xrtpub.harvard.edu/pub.html

Chandra X-ray Observatory (AXAF)

The Chandra X-ray Observatory is the U.S. follow-on to the Einstein Observatory. Chandra was formerly known as AXAF, the Advanced X-ray Astrophysics Facility, but renamed by NASA in December, 1998. The Chandra spacecraft carries a high resolution mirror, two imaging detectors, and two sets of transmission gratings.

http://chandra.harvard.edu/

Chandra X-ray Observatory (AXAF) - Science Center (ASC)

The Chandra (AXAF) Science Center is located at the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts. The purpose of the ASC is to provide the support required by the science community to realize fully the potential of the Chandra X-ray Observatory.

http://asc.harvard.edu/

Chicago Air Shower Array

The Chicago Air Shower Array (CASA) is a very large array of scintillation counters located in Utah, fifty miles southwest of Salt Lake City. CASA has been operating since 1992 in coincidence with a second array, the Michigan Anti (MIA), is made of 2500 square meters of buried muon detectors. CASA is the most sensitive experiment built to date in the study of gamma-ray and cosmic ray interactions at energies above 100 TeV (10^14 electron-Volts). Research topics on data from this experiment cover a wide variety of physics issues, including the search for gamma-rays from extragalactic sources (quasars and gamma-ray bursts), the study of diffuse gamma-ray emission from the Galactic plane, and a measurement of the cosmic ray composition in the poorly understood region from 100 to 100,000 TeV.

http://hep.uchicago.edu/~covault/casa.html

Coded Aperture Imaging in High-Energy Astronomy

Information about coded aperture imaging as applied in X- and gamma-ray astronomy: - introduction to the principle - specific details about instruments of the past, present and proposed future - bibliography.

http://lheawww.gsfc.nasa.gov/docs/cai/coded.html

Collaboration between Australia and Nippon for a Gamma Ray Observatory in the Outback (CANGAROO)

The project uses two gamma ray telescopes at a dark site 15 km from Woomera, a small town 500 km north of Adelaide.

http://www.physics.adelaide.edu.au/astrophysics/cangaroo.html

Compton Gamma-Ray Observatory (CGRO. GSFC. NASA)

The Compton Gamma Ray Observatory is the second of NASA's Great Observatories. Compton, at 17 tons, the heaviest astrophysical payload ever flown, was launched on April 5, 1991 aboard the space shuttle Atlantis. Compton has four instruments that cover an unprecedented six decades of the electromagnetic spectrum, from 30 keV to 30 GeV

http://cossc.gsfc.nasa.gov/cossc/cgro.html

Constellation-X

The Constellation X-ray Mission (formerly HTXS) is a Next Generation X-ray Observatory dedicated to observations at high spectral resolution, providing as much as a factor of 100 increase in sensitivity over currently planned high resolution X-ray spectroscopy missions.

http://constellation.gsfc.nasa.gov/

Cosmic rays, gamma rays, and neutrinos (categorized list of links to experiments and institutions)

A categorized list of links to experiments and institutions in the areas of cosmic rays, gamma rays, and neutrinos.

http://www-hfm.mpi-hd.mpg.de/CosmicRay/CosmicRaySites.html

Deep Undersea Muon and Neutrino Detection (DUMAND)

Directory tree of information about the DUMAND project, designed to serve the needs of the experimenters, as well as to make information about DUMAND progress available to the broader scientific public.

http://www.phys.washington.edu/~dumand/

Einstein Observatory (HEAO-2)

The second of NASA's three High Energy Astrophysical Observatories, HEAO 2, renamed Einstein after launch, was the first fully imaging X-ray telescope put into space. The few arcsecond angular resolution, the field-of-view of tens of arcminutes, and a sensitivity several 100 times greater than any mission before it provided, for the first time, the capability to image extended objects, diffuse emission, and to detect faint sources. It was also the first X-ray NASA mission to have a Guest Observer program. Overall, it was a key mission in X-ray astronomy and its scientific outcome completely changed the view of the X-ray sky.

http://heasarc.gsfc.nasa.gov/docs/einstein/heao2.html

Extreme UltraViolet Explorer (EUVE) Archive (at HEASARC)

A copy of the EUVE Final Archive is at HEASARC for the service of the community of high-enregy astrophysicists.

http://euve.gsfc.nasa.gov/

Falling into a Black Hole

In which we fall into a black hole on a real free fall orbit. All distortions of images are real, both general relativistic from the gravitational bending of light, and special relativistic from the near light speed orbit. After you are done dying at the central singularity of the black hole, feel free to explore more about the Schwarzschild geometry, about wormholes, and about the collapse of a black hole.

http://casa.colorado.edu/~ajsh/schw.html

Fred Lawrence Whipple Gamma-Ray Telescopes (Tucson, Ariz)

http://egret.sao.arizona.edu/

GRB Coordinates Network (GCN)

The GRB Coordinates Network (used to be called BACODINE) system (1) calculates RA,Dec coordinate positions of Gamma Ray Bursts (GRB) detected with BATSE and distributes those positions around the world in real time -- a few seconds! -- so that other instruments can make follow-up observations in other wavebands while the burst is still bursting! (2) distributes locations of GRBs detected by other spacecraft. (3) distributes reports follow-up observations made by ground-based optical and radio observers.
These three functions provide a one-stop shopping network for follow-up sites and GRB researchers.

http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn_main.html

Gamma and Cosmic Ray Astrophysics Branch (NRL)

The mission of the Gamma and Cosmic Ray Astrophysics Branch of the Space Science Division (SSD), at the Naval Research Laboratory (NRL) is to conduct a broadly-based research program relating to the gamma-ray and cosmic-ray enviroment and the use of gamma ray and energetic particle detection systems in space.

http://osse-www.nrl.navy.mil/

Gamma-Ray Astronomy with COMPTEL (MPE Garching)

Local project documentation and utilities as well as collaboration-wide information sources are maintained by the MPE COMPTEL people for: COMPTEL Data Reduction Group work: documents, scientific results and utilities used by the data analysts, the processing team and the scientists. COMPASS software system work : technical and management documents, used and maintained by the MPE software team. the local computing environment : documents on system configuration, maintained by the MPE/RZG software team. MPE - COMPTEL People Matters: the weekly activity list individual 'home pages'

http://www.gamma.mpe-garching.mpg.de/gamma.html

Gamma-ray Large Area Space Telescope (GLAST)

The GLAST Mission is under study for flight in the first decade of the next century. GLAST is a next generation high-energy gamma-ray observatory designed for making observations of celestial gamma-ray sources in the energy band extending from 10 MeV to more than 100 GeV.

http://www-glast.stanford.edu/

Ginga

Astro-C, renamed Ginga (Japanese for 'galaxy'), was launched from the Kagoshima Space Center on 5 February 1987. The primary instrument for observations was the Large Area Counter (LAC). Ginga was the third Japanese X-ray astronomy mission, following Hakucho and Tenma. Ginga reentered the Earth's atmosphere on 1 November 1991.

http://heasarc.gsfc.nasa.gov/docs/ginga/ginga.html

High Energy Astrophysics Division (SAO)

The Division's main focus is on X-ray astronomy via observations of high-energy sources with instruments aboard satellites, rockets, and the Space Shuttle; and development of new instrumentation for future space missions to address the processes involved in generating x-rays, the amount of matter in the universe, and the origin, evolution, and the ultimate fate of the universe. The AXAF Science Center The AXAF HRC project The AXAF Mission Support Team The ROSAT Science Data Center The PROS/XRAY Data Analysis Software The Einstein Data Center The Spectrum-X Gamma Coordination Facility The Solar and Stellar X-ray Group The Astrophysics Data System Project The Einline Database Service The SIMBAD Database Service The Quasar Energy Distribution Team The Supernova Remnant Group The Energetic X-Ray Imaging Survey Telescope (EXIST) The Large Area X-Ray Spectroscopy Mission (LAXSM) Galaxy Clusters at the Center for Astrophysics Multiwavelength Atlas of Galaxies The Everyday Classroom Tools Project The SAO Summer Intern Program Science Education and Outreach HEAD Lunch Talks Preprints of HEAD papers

http://hea-www.harvard.edu/

High Energy Astrophysics Missions (HEASARC. GSFC. NASA)

Comprehensive list of satellites with high energy astrophysics instrumentation. Includes images from these missions.

http://heasarc.gsfc.nasa.gov/docs/heasarc/missions.html

High Energy Gamma Ray Astronomy (HEGRA)

The HEGRA experiment (High Energy Gamma Ray Astronomy) is mainly devoted to the study of VHE gamma ray emmision (in the range between 5*10¹¹ eV and 10¹⁶ eV) produced either by galactic and extragalactic objects. The experiment also studies the origin and nature of cosmic rays in this energy range. It is located at The Roque de los Muchachos Observatory at LA Palma (Canary Islands, Spain) as a guest of the Instituto de Astrofísica de Canarias (IAC) .

http://wpos6.physik.uni-wuppertal.de:8080/

High Energy Gamma Ray Astronomy experiment (HEGRA)

The HEGRA experiment was constructed for investigations of cosmic rays (seen as extended air showers) at energies too high to be detectable by small satellite experiments. The HEGRA detector is sensitive in the energy range from 0.5-10.000 TeV and was designed with special emphasis on the detection of Gamma Rays. HEGRA is located at the Roque de los Muchachos Observatory on La Palma.

http://wpos6.uni-wuppertal.de:8080/

High Energy X-ray Timing Experiment (HEXTE)

The High Energy X-ray Timing Experiment is one of 3 common-user instruments on board the Rossi X-ray Timing Explorer (RXTE) which was launched on 1995 December 30. The HEXTE is sensitive to X-rays from 15 to 250 keV and is able to time-tag photons in this energy range to 8 microseconds.

http://mamacass.ucsd.edu:8080/hexte/hexte.html

High Resolution Fly's Eye Cosmic Ray Detector (HiRes)

The HiRes detector - an atmospheric fluorescence detector: HiRes currently consists of two sites on top of two mountains seperated by 13km in western Utah. At present it consists of a 14 mirror prototype at the first site and a 4 mirror site at the second site. Construction is under way to built two full eyes which should be finnished by the end of 1996

http://www.physics.adelaide.edu.au/astrophysics/FlysEye.html

IKI, Moscow - High Energy Astrophysics

High Energy Astrophysics department at IKI, Moscow, is carrying out research in various fields of X-ray astronomy: physical processes in the vicinity of compact sources of x-ray emission, x-ray observations using Russian space observatories MIR/KVANT and GRANAT, development of scientific instrumentation for the SPECTRUM-X-GAMMA mission and ALPHA space station, participation in the INTEGRAL project.

http://hea.iki.rssi.ru/

Imagine the Universe

This site is dedicated to a discussion about our Universe... what we know about it, how it is evolving, and the kinds of objects and phenomena it contains. Just as importantly, we also discuss how scientists know what they know, what mysteries remain, and how they might one day find the answers to these questions. This site is intended primarily for ages 14 and up. If you are interested in a lower level, more basic discussion about astronomy and space exploration, try our StarChild site. It may have just what you are looking for!

http://imagine.gsfc.nasa.gov/

Institute of Space and Astronautical Science (Japan) - Astronomy Group (ISAS)

ISAS Astronomy Projects/Missions: Ginga, ASCA, ASTRO-E,IRTS, IRIS, BICE, ISO, YOHKOH, VSOP(Space VLBI).

http://www.astro.isas.ac.jp/

INACTIVE LINK ? - 15 --- Instituto de Astronomia y Fisica del Espacio (IAFE)

IAFE is an Institute devoted to the research in the areas of Astronomy, Solar Physics, Astrophysical Plasmas, Atomic Collisions and Relativistic Quantum Field Theories and Gravitation. Besides the Institute takes part in international interinstitutional instrumental projects. The objective of the Institute of Astronomy and Space Physics in Buenos-Aires, Argentina, is to constitute a multidisciplinary group of astronomers, physicists and engineers, whose work be centered on astrophysical problems not covered by other national institutions. Besides, through the requirements imposed by the non classical astronomical experiments, to carry on technological developements, mainly in the area of electronics, transferable to other sectors of the scientific-technological system of the country.
The Investigation Projects are: Astronomy, Solar Physics, Astrophysical Plasmas, Relativistic Quantum Field Theories and Gravitation, and Atomic Collisions.

http://www.iafe.uba.ar/

Laboratori Nazionali del Gran Sasso (INFN, Italy)

Underground laboratory for Particle Physics and Astrophysics. The server includes information about the experiments:

• GALLEX
• LVD
• MACRO

http://www.lngs.infn.it/

Lawrence Livermore National Laboratory - Physics Directorate (LLNL)

http://www-phys.llnl.gov/

Low Energy Gamma-Ray Imager (LEGRI)

LEGRI is a payload for the first mission of the Spanish MINISAT platform. The objective of LEGRI is to demonstrate the viability of HgI2 detectors for space astronomy, providing imaging and spectroscopical capabilities in the 10-100 keV range.

http://pollux.uv.es/legri.html

MOnitoring X-ray Experiment (MOXE)

The MOnitoring X-ray Experiment (MOXE) is an X-ray all-sky monitor to be launched on the Russian Spectrum-X-Gamma satellite. It will monitor several hundred X-ray sources on a daily basis, and will be the first instrument to monitor the complete X-ray sky simultaneously. MOXE is built by Los Alamos Nat Lab, Goddard Space Flight Center and Space Research Institute (Moscow).

http://nis-www.lanl.gov/nis-projects/moxe/

Max Planck Institut für Extraterrestrische Physik

http://www.mpe.mpg.de/

Multiwavelength Milky Way

Images of the Milky Way galaxy in the light of several spectral lines and continuum bands, spanning the electromagnetic spectrum from radio to high-energy gamma-ray, are presented. The display is interactive, allowing zooming and panning of the images, each of which covers the entire sky within ten degrees of the Galactic plane. Explanatory text and links to the data sources and references are included. The Multiwavelength Milky Way site is an educational service of the Astrophysics Data Facility at NASA Goddard Space Flight Center.

http://adc.gsfc.nasa.gov/mw/milkyway.html

Neutrino Oscillation MAgnetic Detector (NOMAD)

Nomad (Neutrino Oscillation MAgnetic Detector) is CERN experiment WA96. The experiment searches for the oscillation nu_mu -> nu_tau in the CERN wide-band neutrino beam. It aims at detecting tau-neutrino charged-current interactions by observing the production of the tau lepton through its various decay modes by means of kinematical criteria.

http://nomadinfo.cern.ch/

Nonproliferation and International Security (NIS/LANL)

The interests in astrophysics of the Astrophysics and Radiation Measurements Group (NIS-2) focus on gamma-ray bursts, x-ray binaries, accretion- and rotation-powered pulsars, neutron star dynamics, atomic processes in astrophysical sources, soft x-ray and EUV backgrounds, and EUV and soft x-ray transients such as flare stars.
An important mission of the group is to develop new types of optical, ultraviolet, x-ray and gamma-ray detectors for ground and space applications. The group has flown high-energy instruments on Pioneer Venus Orbiter, the ISEE-3 (ICE), P78-1, Vela satellites, and the Japanese satellite Ginga. The group is currently developing experiments for several scientific missions including the X-ray Multimirror Mission (XMM), High Energy Transient Explorer (HETE), MARS-96, and the MOXE all sky x-ray monitor on the Russian Spectrum X-Gamma satellite project, and is the lead institution operating the Array of Low Energy X-ray Imaging Sensors (ALEXIS) satellite and its wide field-of-view ultrasoft x-ray telescope array.
The group is actively participating in Compton Gamma Ray Observatory (CGRO) and Rossi X-ray Timing Explorer (RXTE) research through several guest investigator projects, and is also involved in establishing the growing-up Fenton Hill Observatory in the Jemez mountains, which includes an ultra-high-energy gamma-ray telescope, Milagro.

http://nis-www.lanl.gov/nis-projects/

REACT Optical Gamma-Ray Burst Follow-up Network

REACT is a consortium of optical telescopes that have agreed to work together toward a common goal of comprehensive, multiwavelength study of gamma-ray burst afterglows.

http://pulsar.ucolick.org/REACT/

ROSAT

Roentgen Satellite (X-ray satellite) operated by the Max-Planck-Institut für Extraterrestrische Physik (MPE), Garching, Germany.

http://wave.xray.mpe.mpg.de/rosat/

ROSAT All Sky Survey (RASS at MPE)

The ROSAT All-Sky X-ray Survey was obtained during 1990/1991 using the ROSAT Position Sensitive Proportional Counter (PSPC) in combination with the ROSAT X-ray Telescope (XRT).

http://wave.xray.mpe.mpg.de/rosat/survey

ROSAT Guest Observer Facility (ROSAT)

The ROSAT Science Data Center (RSDC) is responsible for execution of the guest investigator program, including such activities as providing assistance in the preparation of proposals, the receiving, processing, and distributing ROSAT pointed data, and providing facilities for the scientific analysis of these data.

http://rosat.gsfc.nasa.gov/

ROentgen SATellite (ROSAT at GSFC. NASA)

ROSAT, the ROentgen SATellite, is an X-ray observatory developed through a cooperative program between the Germany, the United States, and the United Kingdom. The satellite was designed and is operated by Germany, and was launched by the United States on June 1, 1990.

http://heasarc.gsfc.nasa.gov/docs/rosat/rosat3.html

RXTE Guest Observer Facility (GFSC)

http://xte.gsfc.nasa.gov/

Radio Ice Cherenkov Experiment (RICE)

A prototype ultra-high energy neutrino detector/obervatory located at the South Pole. RICE consists of an array of radio antennas buried deep in the ice which detect coherent Cherenkov emission from electromagnetic cascades produced as a by product of ultra-high energy neutrino interactions.

http://kuhep4.phsx.ukans.edu/~iceman/

Robotic Optical Transient Search Experiment (ROTSE)

ROTSE is an experimental program to search for astrophysical optical transients on time scales of a fraction of a second to a few hours. This is an area of astronomical science that has been relatively unexplored until now. The primary incentive for this research is to find the optical counterparts of gamma-ray bursts (GRBs). Two sets of instruments are now under construction: ROTSE-I, a 4-fold camera array using telephoto lenses to cover a 16 degree by 16 degree field of view and ROTSE-II, a pair of 0.45 meter aperture telescopes to cover a 2 degree by 2 degree field of view. The expected sensitivities of these two systems is expected to be m_v ~ 15 and 18 respectively.

http://www.umich.edu/~rotse

Rossi X-Ray Timing Explorer Project (RXTE)

The Rossi X-ray Timing Explorer is designed to facilitate the study of time variability in the emission of X-ray sources with moderate spectral resolution.

http://space.mit.edu/XTE/XTE.html

Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE)

STACEE is a new experiment for detecting gamma-rays with energies from 20 to 300 GeV, corresponding to the last unopened window in the electromagnetic spectrum. STACEE will use a the heliostats available at a large solar power facility to collect Cherenkov light that results from gamma-ray air showers. STACEE is currently under development and should be operational sometime in 1997 or 1998.

http://hep.uchicago.edu/~stacee/stacee.html

Spectrum-X-Gamma Coordination facility (SXG. University of Harvard)

Spectrum-X-Gamma (SXG) is an international high-energy astrophysics observatory which is being built under the leadership of the Russian Space Research Institute (IKI). The US SXG CF supports the US astronomical community in obtaining information about SXG, proposing for and making SXG observations, and performing archival research using the SXG archive

http://hea-www.harvard.edu/SXG/sxg.shtml

Sternberg Astronomical Institute (Moscow)- Relativistic Astrophysics Department (SAI)

Relativistic Astrophysics Department of the Sternberg Astronomical Institute.

http://xray.sai.msu.ru/

Sudbury Neutrino Observatory (SNO at Queen's University)

SNO is an astronomical neutrino observatory that is being built below ground in the deepest section of INCO Limited's Creighton Mine near Sudbury, Ontario. SNO is an international collaboration of scientists from Canada, USA and UK. Information services are available at

• Queen's University
• University of Guelph.

http://www.sno.phy.queensu.ca/

Super-Kamiokande

Super-Kamiokande is a joint Japan-US collaboration to construct the world's largest underground neutrino observatory.

http://www.phys.washington.edu/~superk/

Telescope Array Project

A project of ground-based detector for Astrophysics.

http://www-ta.icrr.u-tokyo.ac.jp/

Texas A&M University. High Energy Physics Group (MACRO experiment at Gran Sasso)

Information server operated by the High Energy Physics Group at Texas A&M University

http://hepr5.tamu.edu/macro.html

UK Dark Matter Collaboration (PPARC, UK)

The UK Dark Matter Collaboration is a consortium of astrophysicists and particle physicists, conducting experiments with the ultimate goal of detecting rare scattering events which would occur if the Galactic dark matter consists largely of a new heavy neutral particle.

http://hepwww.rl.ac.uk/ukdmc/

Uhuru Satellite (GSFC. NASA)

Uhuru was the first earth-orbiting mission dedicated entirely to celestial X-ray astronomy. It was launched on 12 December 1970 into an orbit of about 560 km apogee, 520 km perigee, 3 degrees inclination, with a period of 96 minutes. The mission ended in March 1973.

http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/uhuru.html

Ulysses Mission (JPL)

The Ulysses Mission is the first spacecraft to explore interplanetary space at high solar latitudes. Ulysses is a joint endeavor of the European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA) of the USA. Instruments include: Magnetometer (VHM/FGM), Solar Wind Plasma Experiment (SWOOPS), Solar Wind Ion Composition Instrument (SWICS), Unified Radio and Plasma Wave Instrument (URAP), Energetic Particle Instrument (EPAC), Low-Energy Ion and Electron Experiment (HISCALE), Cosmic Ray and Solar Particle Instrument (COSPIN), Solar X-ray and Cosmic Gamma-Ray Burst Instrument (GRB)

http://ulysses.jpl.nasa.gov/ULSHOME.html

University of California, Riverside - High Energy Astrophysics (UCR)

Information on current research in High Energy Astrophysics being conducted at the University of California, Riverside.

http://tigre.ucr.edu/astro.html

University of New Hampshire - High Energy Astrophysics Group

COMPTEL Project.

http://wwwgro.unh.edu/

X-Ray Astronomy Data Center at the Max-Planck-Institute for Extraterrestrial Physics (MPE)

Research activities, data center services, and databases related to the X-ray satellite ROSAT at the Max-Planck-Institute for extraterrestrial Physics.

http://wave.xray.mpe.mpg.de/data_center

X-Ray Timing Explorer (XTE. GSFC.NASA)

The Rossi X-ray Timing Explorer is a Goddard mission which was launched on December 30th, 1995. RXTE is designed to facilitate the study of time variability in the emission of X-ray sources with moderate spectral resolution. Time scales from microseconds to months are covered in an instantaneous spectral range from 2 to 250 keV. It is designed for a required lifetime of two years, with a goal of five years.

http://heasarc.gsfc.nasa.gov/docs/xte/XTE.html

X-rays from Hot Massive Stars (XMEGA)

This site is a central location for scientists interested in the problem of X-ray emission from hot, massive stars. It contains a list of current observational projects and planned observations. Schedules of currently planned X-ray observations are also included for those interested in providing ground-based coordinated observations.

http://lheawww.gsfc.nasa.gov/users/corcoran/xmega/xmega.html