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 [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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References
Baring, M.: 1990,Monthly Not. Roy. Astr. Soc. 244, 49.
Baring, M.: 1994,Astrophys. J. Suppl. Ser. 90, 899.
Connors, A., Aarts, H., Bennett, K. et al.: 1993,Astron. Astrophys. Suppl. Ser. 97, 75.
Hurley, K., Bertsch, D., Cline, T. et al.: 1994a,IAU Circular 5940.
Hurley, K., Dingus, B., Mukherjee, R. et al.: 1994b,Nature 372, 652.
Ryan, J., Bennett, K., Collmar, W. et al.: 1994,Astrophys. J. 422, L67.
Schmidt, W. 1978:Nature 271, 525.
Schönfelder, V., Aarts, H., Bennett, K. et al.: 1993,Astrophys. J. Suppl. Ser. 86, 657.
Winkler, C., Kippen, R.M., Bennett, K. et al.: 1995,Astron. Astrophys. in press
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Winkler, C., Bennett, K., Hanlon, L.O. et al. Comptel analysis of GRB 940217. Astrophys Space Sci 231, 153–156 (1995). https://doi.org/10.1007/BF00658606
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DOI: https://doi.org/10.1007/BF00658606