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

被引：67

作者：

Giuliani, A. ^{[1
]}

Mereghetti, S. ^{[1
]}

Fornari, F. ^{[1
]}

Del Monte, E. ^{[3
]}

Feroci, M. ^{[3
]}

Marisaldi, M. ^{[5
]}

Esposito, P. ^{[1
,8
,19
]}

Perotti, F. ^{[1
]}

Tavani, M. ^{[3
,4
]}

Argan, A. ^{[3
]}

Barbiellini, G. ^{[6
,7
]}

Boffelli, F. ^{[8
,19
]}

Bulgarelli, A. ^{[5
]}

Caraveo, P. ^{[1
]}

Cattaneo, P. W. ^{[8
]}

Chen, A. W. ^{[1
,2
]}

Costa, E. ^{[3
]}

D'Ammando, F. ^{[3
,4
]}

Di Cocco, G. ^{[5
]}

Donnarumma, I. ^{[3
]}

Evangelista, Y. ^{[3
]}

Fiorini, M. ^{[1
]}

Fuschino, F. ^{[5
]}

Galli, M. ^{[15
]}

Gianotti, F. ^{[5
]}

Labanti, C. ^{[5
]}

Lapshov, I. ^{[3
]}

Lazzarotto, F. ^{[3
]}

Lipari, P. ^{[13
]}

Longo, F. ^{[6
,7
]}

Morselli, A. ^{[10
]}

Pacciani, L. ^{[3
]}

Pellizzoni, A. ^{[1
]}

Piano, G. ^{[3
,4
]}

Picozza, P. ^{[10
]}

Prest, M. ^{[11
]}

Pucella, G. ^{[3
]}

Rapisarda, M. ^{[12
]}

Rappoldi, A. ^{[8
]}

Soffitta, P. ^{[3
]}

Trifoglio, M. ^{[5
]}

Trois, A. ^{[3
]}

Vallazza, E. ^{[6
,7
]}

Vercellone, S. ^{[1
]}

Zanello, D. ^{[13
]}

Salotti, L. ^{[14
]}

Cutini, S. ^{[9
]}

Pittori, C. ^{[9
]}

Preger, B. ^{[9
]}

Santolamazza, P. ^{[9
]}

机构：

[1] INAF IASF Milano, I-20133 Milan, Italy

[2] CIFS Torino, I-10133 Turin, Italy

[3] INAF IASF Roma, I-00133 Rome, Italy

[4] Univ Roma Tor Vergata, Dip Fis, I-00133 Rome, Italy

[5] INAF IASF Bologna, I-40129 Bologna, Italy

[6] Ist Nazl Fis Nucl, I-34127 Trieste, Italy

[7] Dip Fis, I-34127 Trieste, Italy

[8] Ist Nazl Fis Nucl, I-27100 Pavia, Italy

[9] ASI ASDC, I-00044 Frascati, Roma, Italy

[10] INFN Roma Tor Vergata, I-00133 Rome, Italy

[11] Univ Insubria, Dip Fis, I-22100 Como, Italy

[12] ENEA, I-00044 Frascati, Roma, Italy

[13] INFN Roma La Sapienza, I-00185 Rome, Italy

[14] ASI, I-00198 Rome, Italy

[15] ENEA, I-40129 Bologna, Italy

[16] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[17] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[18] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[19] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy

[20] Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany

[21] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[22] Moscow Space Res Inst, Moscow 117997, Russia

[23] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2008年 / 491卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

gamma rays: bursts;

D O I：

10.1051/0004-6361:200810737

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 by a cooperation between 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 has been seen from a few other GRBs observed with EGRET. However, during the brightest phases, the latter measurements were affected 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.

引用

页码：L25 / L28

页数：4

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