Comptel analysis of GRB 940217

Details Comptel analysis of GRB 940217 Comptel analysis of GRB 940217

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.231..153w&link_type=abstract

Astrophysics and Space Science, Volume 231, Issue 1-2, pp. 153-156

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

COMPTEL on board CGRO has observed a very strong (S[> 0.3 MeV] = 2.03 × 10-4 erg cm-2), complex, and long lasting (162 s) gamma-ray burst on February 17, 1994 (GRB 940217). Temporal fluctuations occur on timescales as short as 100 ms. Hard-to-soft spectral evolution has been observed during the burst emission and also within individual peaks. The photon spectra obtained within the 6 peaks can be modelled by single power law spectra and by broken power laws with break energies at around 1 MeV. The best-fit power law slopes vary between 1.1 and 3.5 throughout the event. The burst is located at [α 2000,δ 2000] = [29.5°, 3.8°] with a 3σ error radius of 0.9°. COMPTEL does not detect any significant “post-burst” emission (as reported by EGRET) at low energies (< 30 MeV), and our upper limits are marginally consistent with the EGRET detections. Using high energy spectral and temporal information, distance limits to GRB 940217 have been derived.

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