AGILE探测到GRB 080514B的延迟伽马射线发射
天体物理学
2010-03-19 v1
摘要
GRB 080514B是自EGRET时代以来，首次使用对湮灭跟踪望远镜探测到能量高于几十MeV的单个光子的伽马射线暴（GRB）。该暴是由意大利AGILE伽马射线卫星发现的。通过AGILE与行星际网络（IPN）的合作，对该暴进行了定位。在SuperAGILE-IPN定位之前获得的伽马射线成像仪（GRID）位置估计，被发现与暴的位置一致。SuperAGILE观测到的硬X射线发射持续了约7秒，而有证据表明，高于30 MeV的发射持续时间更长（至少约13秒）。过去从EGRET观测到的其他几个GRB中也看到了类似的行为。然而，后者的测量在最亮阶段受到仪器死时间效应的影响，只能得到暴强度的下限。得益于AGILE/GRID的小死时间，我们能够确定，在GRB 080514B的情况下，伽马射线与X射线通量比在瞬时发射阶段和延展发射阶段之间发生了显著变化。
引用
@article{arxiv.0809.1230,
title = {AGILE detection of delayed gamma-ray emission from GRB 080514B},
author = {A. Giuliani and S. Mereghetti and F. Fornari and E. Del Monte and M. Feroci and M. Marisaldi and P. Esposito and F. Perotti and M. Tavani and A. Argan and G. Barbiellini and F. Boffelli and A. Bulgarelli and P. Caraveo and P. W. Cattaneo and A. W. Chen and E. Costa and F. D'Ammando and G. Di Cocco and I. Donnarumma and Y. Evangelista and M. Fiorini and F. Fuschino and M. Galli and F. Gianotti and C. Labanti and I. Lapshov and F. Lazzarotto and P. Lipari and F. Longo and A. Morselli and L. Pacciani and A. Pellizzoni and G. Piano and P. Picozza and M. Prest and G. Pucella and M. Rapisarda and A. Rappoldi and P. Soffitta and M. Trifoglio and A. Trois and E. Vallazza and S. Vercellone and D. Zanello and L. Salotti and S. Cutini and C. Pittori and B. Preger and P. Santolamazza and F. Verrecchia and N. Gehrels and K. Page and D. Burrows and A. Rossi and K. Hurley and I. Mitrofanov and W. Boynton},
journal= {arXiv preprint arXiv:0809.1230},
year = {2010}
}
备注
A&A letters, in press