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201. HEAO 1 A1 Lightcurves
ID:
ivo://nasa.heasarc/a1point
Title:
HEAO 1 A1 Lightcurves
Short Name:
A1POINT
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
HEAO 1 (High Energy Astronomical Observatory) is a spinning survey mission X-ray satellite. It launched 12 August 1977 and was in operation until 9 January 1979. HEAO-1 rotated once per 30 minutes about the Earth-Sun line. In this manner, the instruments scanned a great circle in the sky that lay 90 degrees from the sun. A given source near the ecliptic was viewed for a few days while sources near the ecliptic pole were scanned nearly continuously during the entire mission. The satellite has limited pointing capability that was used to produce this data, giving continuous coverage of selected sources. The pointings began about 100 days into the mission. The A1 instrument, also known as the NRL Large Area Sky Survey Experiment (LASS) covered the energy range 0.25 to 25.0 keV. The experiment consisted of seven detectors, six mounted on the -Y side of the spacecraft, the seventh on the +Y side. Two detectors, with a FWHM of 1 deg x 0.5 deg and open area of 1350 cm2 were tilted a third of a degree either towards or away from the Z (Sun-pointed) four other -Y side detectors has a FWHM of 1 deg x 4 deg and an open area of 1650 cm2. The single +Y detector has a FWHM of 2 deg x 8 deg and an open area of 1900 cm2. The experiment had sufficient sensitivity to detect sources as faint as as 0.25 uJy at 5 keV for sources with a Crab-like spectrum. Data was collected in either a 5 or a 320 millisecond timing resolution mode: Full sky coverage for both time resolutions was achieved before the mission's end. Wood et al. (1984) discuss the experiment and a catalog of sources in further detail. This is a service provided by NASA HEASARC .
202. HEAO 1 A3 MC LASS Catalog
ID:
ivo://nasa.heasarc/a3
Title:
HEAO 1 A3 MC LASS Catalog
Short Name:
A3
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
This database table contains information from the HEAO 1 A3 MC LASS Catalog of X-ray Sources. The MC experiment contained two four-grid modulation collimators with an egg-crate collimator with an overall FOV of 4 x 4 degrees (FWHM). The objects in the catalog are possible HEAO 1 A1 sources. The HEAO 1 experiment began on day 224, 19 August 1977 and ended on day 739, 9 January 1979. This is a service provided by NASA HEASARC .
203. HEAO 1 A2 Pointed Lightcurves
ID:
ivo://nasa.heasarc/a2lcpoint
Title:
HEAO 1 A2 Pointed Lightcurves
Short Name:
A2LCPOINT
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, from August, 1977 until January 1979. The experiment consisted of six multi-layer, multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database table accesses the lightcurves available at HEASARC obtained from the A2 MED (small and large field of view) and HEDs (3 units, each with small and large field of view) detectors during the pointed phase. This is a service provided by NASA HEASARC .
204. HEAO 1 A2 Pointing Catalog
ID:
ivo://nasa.heasarc/a2point
Title:
HEAO 1 A2 Pointing Catalog
Short Name:
A2POINT
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The HEAO 1 A-2 Pointing Catalog of High-Energy X-ray Sources is the result of a study of selected targets using the three detectors of the A-2 Experiment. The detectors consisted of the HED (high energy detector) in the range 3-6 KeV, the MED (medium energy detector) in the range 1.5-15 KeV, and the LED (low energy detector) in the range 0.15-3 KeV. The HEAO A-2 Experiment was primarily designed for studying the diffuse X-ray background; however, it was also capable of studying point sources to good sensitivity. Thus, after several months of continuous scanning to survey 95% of the diffuse X-ray sky, the A-2 detectors began individual pointings at selected targets. The point maneuvers began on day 319, 15 November 1977 and ended on day 739, 9 January 1979. This is a service provided by NASA HEASARC .
205. HEAO 1 A2 Raw Rates
ID:
ivo://nasa.heasarc/a2rtraw
Title:
HEAO 1 A2 Raw Rates
Short Name:
A2RTRAW
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, between August, 1977 until January 1979. The experiment consisted of six multi-layer multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database accesses the raw rate data obtained from the A2 MED (small and large field of view, FOV) and HEDs (1,2 and 3 small and large filed of view) detectors during the scanning and pointed phase. Note: This database does not contain coordinates. Since the satellite was mostly scanning, the XRATE database, from which the FITS files are generated, was organized in time. This is a service provided by NASA HEASARC .
206. HEAO 1 A2 Scanned Lightcurves
ID:
ivo://nasa.heasarc/a2lcscan
Title:
HEAO 1 A2 Scanned Lightcurves
Short Name:
A2LCSCAN
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, from August, 1977 until January 1979. The experiment consisted of six multi-layer, multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database table accesses the lightcurves available at HEASARC obtained from the A2 MED (small and large field of view) and HEDs (3 units, each with small and large field of view) detectors during the scanning phase. This is a service provided by NASA HEASARC .
207. HEAO 1 A2 Spectra
ID:
ivo://nasa.heasarc/a2spectra
Title:
HEAO 1 A2 Spectra
Short Name:
A2SPECTRA
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, between August, 1977 until January 1979. The experiment consisted of six multi-layer multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database accesses the spectra (and associated files) obtained from the A2 MED (small and large field of view) and HEDs (1 and 3 small and large filed of view) detectors during the pointed phase. The spectra were generated for all HEAO-1 A2 pointed observations except for those in more unusual HEAO-1 modes (RAM-11 and "radical RAMs"). Thus the set of spectra created are only a subset (though a fairly complete one) of the entire catalog of HEAO-1 A2 pointed observations. This is a service provided by NASA HEASARC .
208. HEAO 1 A4 Spectra
ID:
ivo://nasa.heasarc/a4spectra
Title:
HEAO 1 A4 Spectra
Short Name:
A4SPECTRA
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The UCSD/MIT Hard X-Ray and Low-Energy Gamma-Ray Instrument, A4, was flown on the HEAO 1 satellite, between August 1977 until January 1979. The experiment consisted of a collection of collimated sodium iodide scintillators, two of which the Low Energy detectors (LED, LED-3 and LED-6), were optimized for the lower energy part of the hard X-ray range between 13 to 180 keV. The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. In pointing mode the A4-LED instrument look axis was kept in a 1 deg dead band centered on the target position. Instead in the "ping-pong" mode the look axis was regularly alternated with a secondary target a few degrees away, usually for background determination. This database table accesses the spectra (and associated files) obtained from the A4-LED detectors in the ping-pong mode. This is a service provided by NASA HEASARC .
209. HEAO 1 A2 Spectra Background
ID:
ivo://nasa.heasarc/a2specback
Title:
HEAO 1 A2 Spectra Background
Short Name:
A2SPECBACK
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, between August, 1977 until January 1979. The experiment consisted of six multi-layer multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database table accesses all the background files available at HEASARC obtained from the A2 MED (small and large field of view) and HEDs (1 and 3 small and large filed of view) detectors during the pointed phase. This is a service provided by NASA HEASARC .
210. Herschel Astrophysical Terahertz Large Area Survey
ID:
ivo://irsa.ipac/Herschel/Images/H-ATLAS
Title:
Herschel Astrophysical Terahertz Large Area Survey
Short Name:
H-ATLAS
Date:
27 Oct 2022 19:00:00
Publisher:
NASA/IPAC Infrared Science Archive
Description:
The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 600 deg^2 in five photometric bands - 100, 160, 250, 350 and 500 microns - with the Photoconductor Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) cameras. H-ATLAS DR1 includes the survey of three fields on the celestial equator, covering a total area of 161.6 deg^2 and previously observed in the Galaxy and Mass Assembly (GAMA) spectroscopic survey.

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