تقرير
GRB 091024A and the nature of ultra-long gamma-ray bursts
| العنوان: | GRB 091024A and the nature of ultra-long gamma-ray bursts |
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| المؤلفون: | Virgili, F. J., Mundell, C. G., Pal'shin, V., Guidorzi, C., Margutti, R., Melandri, A., Harrison, R., Kobayashi, S., Chornock, R., Henden, A., Updike, A. C., Cenko, S. B., Tanvir, N. R., Steele, I. A., Cucchiara, A., Gomboc, A., Levan, A., Cano, Z., Mottram, C. J., Clay, N. R., Bersier, D., Kopac, D., Japelj, J., Filippenko, A. V., Li, W., Svinkin, D., Golenetskii, S., Hartmann, D. H., Milne, P. A., Williams, G., O'Brien, P. T., Fox, D. B., Berger, E. |
| سنة النشر: | 2013 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We present a broadband study of gamma-ray burst (GRB) 091024A within the context of other ultra-long-duration GRBs. An unusually long burst detected by Konus-Wind, Swift, and Fermi, GRB 091024A has prompt emission episodes covering ~1300 s, accompanied by bright and highly structured optical emission captured by various rapid-response facilities, including the 2-m autonomous robotic Faulkes North and Liverpool Telescopes, KAIT, S-LOTIS, and SRO. We also observed the burst with 8- and 10-m class telescopes and determine the redshift to be z = 1.0924 \pm 0.0004. We find no correlation between the optical and gamma-ray peaks and interpret the optical light curve as being of external origin, caused by the reverse and forward shock of a highly magnetized jet (R_B ~ 100-200). Low-level emission is detected throughout the near-background quiescent period between the first two emission episodes of the Konus-Wind data, suggesting continued central-engine activity; we discuss the implications of this ongoing emission and its impact on the afterglow evolution and predictions. We summarize the varied sample of historical GRBs with exceptionally long durations in gamma-rays (>~ 1000 s) and discuss the likelihood of these events being from a separate population; we suggest ultra-long GRBs represent the tail of the duration distribution of the long GRB population. Comment: Updated abstract, acknowledgements. Accepted for publication in ApJ; 21 pages, 10 figures, 6 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0004-637X/778/1/54 |
| URL الوصول: | http://arxiv.org/abs/1310.0313 |
| رقم الأكسشن: | edsarx.1310.0313 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0004-637X/778/1/54 |
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