COMPTEL Observations of GRB 930131

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Session 74 -- Gamma-Ray Bursts
Oral presentation, Thursday, 2:30-4:00, Zellerbach Auditorium Room

[74.03] COMPTEL Observations of GRB 930131

R.M. Kippen, A. Connors, M. McConnell, J. Ryan (UNH), W. Collmar, J. Greiner, G. Lichti, V. Sch\"onfelder, M. Varendorff (MPE), W. Hermsen, L. Kuiper (SRON-Leiden), L. Hanlon, O.R. Williams, C. Winkler (SSD/ESA)

The Imaging Compton Telescope (COMPTEL) on the {\sl Compton Gamma-Ray Observatory} (CGRO) images gamma radiation in the 0.75-30 MeV energy range. On 1993 January 31 at 18:57:11 UT, COMPTEL detected emission from the intense gamma-ray burst GRB 930131. COMPTEL's imaging capability was utilized to locate the source of this emission to within about 2 degrees sooner than 7 hours after the start of the burst. This early burst location was later found to be consistent with independent BATSE and EGRET positions, as well as triangulation between BATSE and Ulysses. GRB 930131 is among the most successful applications to date of a BATSE/COMPTEL rapid response program which quickly and accurately locates gamma-ray bursts. The majority of emission from GRB 930131 in the COMPTEL data is confined to two short intense pulses both occurring within a $\sim$1 second interval. Spectral analysis of the limited number of COMPTEL telescope events indicate hard, power-law emission extending to greater than 10 MeV. The COMPTEL spectral and temporal observations of this unique gamma-ray burst will be discussed along with results of refined imaging analysis.

Thursday program listing