- ID:
- ivo://nasa.heasarc/ariel5
- Title:
- Ariel V All-Sky Monitor
- Short Name:
- ARIEL5
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The All Sky Monitor was one of six X-ray instruments on the Ariel 5 satellite. The satellite was launched into a low inclination (2.8 degrees), nearly circular orbit (altitude ~520 km) on 15 October 1974. Ariel 5 was actively pointed so that objects of interest could be observed by the four instruments aligned along its spin axis. The ASM was mounted 90 degrees from the spin axis; the satellite had a spin period of 6 seconds. The ASM operated from October 18, 1974 to March 10, 1980. The ASM instrument, built by the Lab for High Energy Astrophysics at NASA- Goddard Space Flight Center, provided continuous coverage of the entire sky, except for a 20 degree band straddling the satellite's equator. The ASM was intended to act as an early detection system for transients, and to monitor the variability of bright ( > 0.2 Crab) galactic sources. The instrument consisted of a pair of X-ray pinhole cameras, each covering opposite halves of the sky, with gas-filled imaging proportional counters. Position determination of sources was accomplished through position-sensitive anode wires and satellite rotation. Each camera had a 1-cm<sup>2</sup> aperture. Overall telemetry constraints limited the duty cycle for any given source to 1 percent. With the low telemetry rate provided for this instrument (1 bit/s), temporal and spectral information were sacrificed for the sake of all-sky coverage. Hence, spectral information was limited to a single 3 - 6 keV bandpass, and temporal resolution was limited to the satellite orbital period, ~100 minutes. This is a service provided by NASA HEASARC .
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- ID:
- ivo://nasa.heasarc/ascamaster
- Title:
- ASCA Master Catalog
- Short Name:
- ASCA
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The ASCAMASTER table contains data on all ASCA observations that were ever in any of the following states: 'Accepted', 'Scheduled Long-Term', 'Scheduled Short-Term', 'Processed', and 'Archived'. The final status of an observation is given by the parameter Status. Specific dates that affect the status of an observation are listed as the parameters scheduled_date, observed_date, processed_date, archived_date, and cycle. Notice that, if one or more of the date parameters are empty for a given observation, this means that that those particular processes have not occurred: e.g., if observed_date is empty, this means that the planned observation was not observed. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/ascao
- Title:
- ASCA Proposals
- Short Name:
- ASCAO
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The ASCAO database contains the listing of accepted targets from all proposals submitted in repsonse to the ASCA Guest Observer (GO) Announcements of Opportunities (AOs), as well as the targets that were selected for the Performance Verification (PV) phase. The current version of ASCAO includes all accepted targets from AOs 1 through 8.5 inclusive. Notice that, since the accepted targets include Priority 3 ones of which only a fraction have or will actually be observed, some of the listed targets in this database will never have been observed. To obtain more detailed information about the status of particular targets, please consult either the Master ASCA database table (ASCAMASTER) or the ASCA Observing Log database table (ASCALOG). This database was last updated in August 2000 based on information provided by the ASCA Project. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/bbxrt
- Title:
- BBXRT Archive
- Short Name:
- BBXRT
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The BBXRT database table contains information about each observation made by the Broad Band X-Ray Telescope. It includes a catalog of observations and spectral and lightcurve products for each of the 10 pixels per observation. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/saxao
- Title:
- BeppoSAX Approved Pointings
- Short Name:
- SAXAO
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The SAXAO database contains the list of the all accepted AO1/AO2/AO3/A04/AO5 SAX CORE and GO program proposals, approved for the first year of operations. The database also includes targets scheduled for the Science Verification Phase (SVP) (from launch, 30 April 1996, till August 1996). The CORE program includes proposals led by Principal Investigator belonging to Italian or Dutch institutions, to the Space Science Department of ESA or to the Max Planck Institute for Extraterrestial Physics in Garching. Approximately 80 percent of the first year observing time is allocated to the CORE program. The remaining 20 percent of time for the first year operations is reserved for the GO program. For the AO2 60 percent is allocated to the CORE program and 40 percent to the GO. For the AO3 and AO4 50 percent is allocated to the CORE program and 50 percent to the GO. More information on the SAX mission is available at the following address <a href="http://www.asdc.asi.it">http://www.asdc.asi.it</a> and also <a href="https://heasarc.gsfc.nasa.gov/docs/sax/saxgof.html">https://heasarc.gsfc.nasa.gov/docs/sax/saxgof.html</a>. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/saxnfilog
- Title:
- BeppoSAX NFI Archive and Observation Log
- Short Name:
- SAXNFI
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The SAXNFILOG database contains the SAX Narrow Field Instruments (NFI) approved pointings, but it also served as an observations log. It includes data taken during AO1, AO2, AO3, A04 and AO5 cycles and the Science Verification Phase (SVP). This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/saxwfclog
- Title:
- BeppoSAX WFC Observation Log
- Short Name:
- SAXWFC
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The SAXWFCLOG database contains the SAX WFCs observations log for the AO cycles and the Science Verification Phase (SVP). The two WFCs are located at 90 degrees from the NFI and set 180 degrees apart. The field of view is 40 deg X 40 deg and the coordinates given in this databases are the pointing positions. The database is updated regularly to include the most recent timeline, and updates are provided by the SAX-Science Data Center in Rome. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/grbcat
- Title:
- Catalog of Gamma-Ray Bursts
- Short Name:
- GRBCAT
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- This GRBs Catalog (GRBCAT) records high level information of the GRBs detected since their discovery in 1967. The catalog has been created using publications that report lists of GRB detections. These are mostly papers already published in refereed journals, unpublished papers, and PhD thesis presenting lists of GRBs. GRBCAT includes also compilation of bursts that were already present in the HEASARC database system. The catalog is organized with a main table reporting general information for each GRB and additional tables linked to the main table where specific information for the flux and the region of detection are reported. Afterglow measurements are also recorded in a separate table for all bursts detected after May 11 1996. The main table for each GRB contains an entry for each satellite that reports a detection with either a flux and/or position measurement. Therefore for a given GRB there are multiple records if the GRB was detected by more than one satellite. The associated flux table contains an entry for each flux and fluence values reported in literature for a given energy band. The positional information is reported via different tables each dedicated to a specific region of detection. The region descriptions are the following : circle, annulus, box, dual, annulus intersect, irregular, and intersect. The associated afterglow table contains position, intensity and redshift measurements taken after the discovery of the GRB. There are several records associated to a given GRB/afterglow since several observatories collected data on that position. The main table and the associated tables are updated when a new GRB and/or afterglow measurements are reported. This table was ingested by the HEASARC in June 2008 based on electronic versions obtained from the author(s), who compiled the catalog in 2005. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/grbcatag
- Title:
- Catalog of Gamma-Ray Bursts: Afterglows
- Short Name:
- GRBCATAG
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The GRB Afterglow table contains intensity and redshift measurements obtained with ground based telescopes or with space based observatories carried out after the detection of the GRBs. The catalog has been created using information from journal publications, IAU circulars, and GCN notices, and records afterglow measurements for bursts detected after May 1996. Each record within this catalog is dedicated to a specific measurement of an afterglow made with an observatory. Therefore for a given GRB, there are several entries reporting afterglow measurements from the different observatories. This catalog is linked to the main GRB catalog and it is updated when a new GRB and/or afterglow measurements are reported. This table was ingested by the HEASARC in June 2008 based on electronic versions obtained from the author(s), who compiled the catalog in 2005. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/comptel
- Title:
- CGRO/COMPTEL Low-Level Data and Maps
- Short Name:
- COMPTEL
- Date:
- 07 Mar 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- COMPTEL is both the name of the Imaging Compton Telescope on the Compton Gamma Ray Observatory (CGRO) and the name of this HEASARC database table which allows the user to select low-level data and maps produced by this instrument. Much more information on the COMPTEL instrument, data products, and data analysis techniques can be obtained from the Compton Observatory Science Support Center (COSSC) web site at <pre> <a href="https://heasarc.gsfc.nasa.gov/docs/cgro/">https://heasarc.gsfc.nasa.gov/docs/cgro/</a> </pre> and from the article in Legacy No. 7 on the HEASARC CGRO Data Archive <pre> <a href="https://heasarc.gsfc.nasa.gov/docs/journal/cgro7.html">https://heasarc.gsfc.nasa.gov/docs/journal/cgro7.html</a> </pre> Interactions in COMPTEL occur in a two stage process: First, a Compton collision occurs in one of seven (low-Z) liquid scintillators and is usually then completely absorbed in one of fourteen (high-Z) NaI(Tl) scintillators. The unusual aspect of this detector is that the location of the gamma-ray on the sky is given by an annulus and not a point. The correlation of many events enables the localization of point sources or the creation of sky maps. Time-of-flight measurements, pulse shape discrimination and anti-coincidence shields are used to reject background events. COMPTEL has a wide field of view (about 1 steradian, equivalent to a FWHM of about 40 degrees), an angular resolution under optimal conditions of about 1 degree, and an energy resolution that ranges from 5-10% at 1 MeV. During Phase 1 of the CGRO mission, COMPTEL completed the first all-sky survey in the energy range of 0.75-30 MeV (in four energy bands). In addition, COMPTEL can measure energy spectra of solar flares or bright cosmic gamma-ray bursts between 0.1-10 MeV, and neutrons from solar flares. This is a service provided by NASA HEASARC .
