High Resolution Gamma-ray Burst Spectra from Mars Observer

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Session 15 -- Gamma Ray Bursts
Display presentation, Monday, 9, 1995, 9:20am - 6:30pm

[15.10] High Resolution Gamma-ray Burst Spectra from Mars Observer

J.G.Laros, W.Boynton (U of AZ), A.Metzger (JPL), R.Starr, J.Trombka (GSFC)

The Gamma-Ray Spectrometer (GRS) experiment on Mars Observer, which featured a fairly large Germanium detector, obtained approximately 2 months of net burst coverage during the cruise phase of the mission before the spacecraft was lost. GRS triggered on a short, intense event that occurred on 1993 July 6, and detected at least 11 additional events in a low time resolution mode. One or two 10kchannel spectra covering 0.2-10 MeV were obtained for each burst. Sensitivity to narrow lines was typically 1-3 photons/cm**2 (4-sigma) for each individual spectrum. All of the spectra have been searched for lines using simple, curve-fitting procedures. Given the very large number of data channels, it is not surprising that a number of >4-sigma line candidates emerged. We will present preliminary results of our analysis, with emphasis on arguments for or against the reality of the candidates. Future work will concentrate on comparing GRS data with corresponding spectra from the BATSE SD Detectors.

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