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SPI: The spectrometer aboard INTEGRAL
SPI is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory). It consists of an array of 19 closely packed germaniumExpand
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BATSE observations of gamma-ray burst spectra. I: Spectral diversity
We studied the time-averaged gamma-ray burst spectra accumulated by the spectroscopy detectors of the Burst and Transient Source Experiment. The spectra are described well at low energy by aExpand
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Evolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts
We report evidence that the asymptotic low-energy power-law slope a(below the spectral break) of BATSE gamma-ray burst (GRB) photon spectra evolves with time rather than remaining constant. WefindExpand
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Diffuse Cosmic Gamma Radiation Measured by HEAO 1
The High Energy Astronomical Observatory 1 (HEAO 1) contained as one of its instruments the UCSD/MIT hard X-ray and gamma-ray instrument, a complex of actively shielded scintillation counters thatExpand
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BATSE Observations of Gamma-Ray Burst Spectra. III. Low-Energy Behavior of Time-averaged Spectra
We analyze time-averaged spectra from 86 bright gamma-ray bursts from the first 5 years of the Burst And Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory to determineExpand
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HEAO 1 observations of the Perseus cluster above 10 keV
We present the results of HEAO 1 observations of the Perseus cluster from 10 to 150 keV in 1977 August and 1978 February and August. The spectrum exhibits a previously unknown hard (>25 keV)Expand
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The Identification of Two Different Spectral Types of Pulses in Gamma-Ray Bursts
It is shown in this study that two different types of spectral emission are generally produced in gamma-ray bursts. A subset of bursts is identified that exhibits a marked lack of fluence above 300Expand
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An absorption feature in the spectrum of the pulsed hard X-ray flux from 4U0115 + 63
A spectral feature, apparently an absorption line, has been observed at an energy of 20.1 ± 0.5 ke V in the pulsed flux of 3.61 s X-ray pulsar 4U0115 + 63 using the UCSD/MIT instrument on HEAO 1. TheExpand
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BATSE spectroscopy catalog of bright gamma-ray bursts
This paper presents comprehensive results on the spectra of 30 bright gamma ray bursts (GRBs) as observed by the Spectroscopy Detectors (SDs) of the Burst And Transient Source Experiment (BATSE). TheExpand
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HEAO 1 observation of a type I burst from MXB 1728-34
Results are presented for an analysis of data on a type I X-ray burst from MXB 1728-34 observed by three large-area instruments on HEAO 1. The measurements cover the energy range from 2 to 150 keVExpand
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