Giuliani 2008 AGILE观测到了比GRB 080514B暴本身时标更长的高能辐射

主要内容:
说EGRET也观测到了类似的现象的。
“Similar behavior was seen in the past from a few other GRBs observed with EGRET. ”

精彩摘抄:
最上面的是高能的光变，比伽玛暴本身的时标要长。

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Title:		AGILE detection of delayed gamma-ray emission from GRB 080514B
Authors:		Giuliani, A.; Mereghetti, S.; Fornari, F.; Del Monte, E.; Feroci, M.; Marisaldi, M.; Esposito, P.; Perotti, F.; Tavani, M.; Argan, A.; Barbiellini, G.; Boffelli, F.; Bulgarelli, A.; Caraveo, P.; Cattaneo, P. W.; Chen, A. W.; Costa, E.; D'Ammando, F.; Di Cocco, G.; Donnarumma, I.; Evangelista, Y.; Fiorini, M.; Fuschino, F.; Galli, M.; Gianotti, F.; Labanti, C.; Lapshov, I.; Lazzarotto, F.; Lipari, P.; Longo, F.; Morselli, A.; Pacciani, L.; Pellizzoni, A.; Piano, G.; Picozza, P.; Prest, M.; Pucella, G.; Rapisarda, M.; Rappoldi, A.; Soffitta, P.; Trifoglio, M.; Trois, A.; Vallazza, E.; Vercellone, S.; Zanello, D.; Salotti, L.; Cutini, S.; Pittori, C.; Preger, B.; Santolamazza, P.; Verrecchia, F.; Gehrels, N.; Page, K.; Burrows, D.; Rossi, A.; Hurley, K.; Mitrofanov, I.; Boynton, W.
Publication:		eprint arXiv:0809.1230
Publication Date:		09/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		A&A letters, in press
Bibliographic Code:		2008arXiv0809.1230G

Abstract

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.

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