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AGILE检测来自GRB 080514 B的延迟gamma-ray发射

AGILE detection of delayed gamma-ray emission from GRB 080514B

A. Giuliani, S. Mereghetti, F. Fornari, E. Del Monte, M. Feroci, M. Marisaldi, P. Esposito, F. Perotti, M. Tavani, A. Argan, G. Barbiellini, F. Boffelli, A. Bul… 展开作者

A. Giuliani, S. Mereghetti, F. Fornari, E. Del Monte, M. Feroci, M. Marisaldi, P. Esposito, F. Perotti, M. Tavani, A. Argan, G. Barbiellini, F. Boffelli, A. Bulgarelli, P. Caraveo, P. W. Cattaneo, A. W. Chen, E. Costa, F. D'Ammando, G. Di Cocco, I. Donnarumma, Y. Evangelista, M. Fiorini, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, I. Lapshov, F. Lazzarotto, P. Lipari, F. Longo, A. Morselli, L. Pacciani, A. Pellizzoni, G. Piano, P. Picozza, M. Prest, G. Pucella, M. Rapisarda, A. Rappoldi, P. Soffitta, M. Trifoglio, A. Trois, E. Vallazza, S. Vercellone, D. Zanello, L. Salotti, S. Cutini, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia, N. Gehrels, K. Page, D. Burrows, A. Rossi, K. Hurley, I. Mitrofanov, W. Boynton

摘要:

GRB 080514 B是自EGRET以来第一个伽马射线暴(GRB),其中能量超过几十MeV的单个光子已被成对转换跟踪望远镜探测到。这次爆发是由意大利AGILE伽马射线卫星发现的。伽马射线暴是在AGILE和行星际网络(IPN)的合作下定位的。在SuperAGILE-IPN定位之前获得的伽马射线成像仪(GRID)的位置估计被发现与爆发位置一致。SuperAGILE观测到的硬X射线发射持续了大约7秒,而有证据表明,30 MeV以上的发射持续了更长的时间(至少~13秒)。类似的行为在过去从EGRET观察到的其他几个伽玛暴中也看到过。然而,后者的测量受到影响,在最亮的阶段,由仪器死区时间的影响,导致只有较低的限制,以爆发的强度。由于AGILE/GRID的死时间很短,我们可以评估GRB 080514 B的伽马射线与X射线的通量比在瞬发和扩展发射阶段之间发生了显着变化。

英文摘要:

GRB 080514B is the first gamma ray burst (GRB), since the time of EGRET, for which individual photons of energy above several tens of MeV have been detected with a pair-conversion tracker telescope. This burst was discovered with the Italian AGILE gamma-ray satellite. The GRB was localized with a cooperation by AGILE and the interplanetary network (IPN). The gamma-ray imager (GRID) estimate of the position, obtained before the SuperAGILE-IPN localization, is found to be consistent with the burst position. The hard X-ray emission observed by SuperAGILE lasted about 7 s, while there is evidence that the emission above 30 MeV extends for a longer duration (at least ~13 s). Similar behavior was seen in the past from a few other GRBs observed with EGRET. However, the latter measurements were affected, during the brightest phases, by instrumental dead time effects, resulting in only lower limits to the burst intensity. Thanks to the small dead time of the AGILE/GRID we could assess that in the case of GRB 080514B the gamma-ray to X-ray flux ratio changes significantly between the prompt and extended emission phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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