Comptel analysis of GRB 940217 |
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Authors: | C. Winkler K. Bennett L. O. Hanlon K. S. O'Flaherty O. R. Williams R. M. Kippen J. Ryan W. Collmar V. Schönfelder H. Steinle W. Hermsen |
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Affiliation: | (1) Space Science Department, ESA/ESTEC, Noordwijk, The Netherlands;(2) University of New Hampshire, ISEOS, Durham, USA;(3) Max-Planck-Institut für extraterrestrische Physik, Garching, Germany;(4) SRON, Utrecht, The Netherlands |
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Abstract: | 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 [2000,2000] = [29.5°, 3.8°] with a 3 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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