The AGILE observations of the hard and bright GRB 100724B
Abstract
The observation of Gamma Ray Bursts (GRBs) in the gamma-ray band has been advanced by the AGILE and Fermi satellites after the era of the Compton Gamma-Ray Observatory. AGILE and Fermi are showing that the GeV-bright GRBs share a set of common features, particularly the high fluence from the keV up to the GeV energy bands, the high value of the minimum Lorentz factor, the presence of an extended emission of gamma-rays, often delayed with respect to lower energies, and finally the possible presence of multiple spectral components. GRB 100724B, localised in a joint effort by Fermi and the InterPlanetary Newtork, is the brightest burst detected in gamma-rays so far by AGILE. Characteristic features of GRB 100724B are the simultaneous emissions at MeV and GeV, without delayed onset nor time lag as shown by the analysis of the cross correlation function, and the significant spectral evolution in hard X-rays over the event duration. In this paper we show the analysis of the AGILE data of GRB 100724B and we discuss its features in the context of the bursts observed so far in gamma-rays and the recently proposed models.
Keywords
Cite
@article{arxiv.1109.3018,
title = {The AGILE observations of the hard and bright GRB 100724B},
author = {E. Del Monte and G. Barbiellini and I. Donnarumma and F. Fuschino and A. Giuliani and F. Longo and M. Marisaldi and G. Pucella and M. Tavani and M. Trifoglio and A. Trois and A. Argan and A. Bulgarelli and P. Caraveo and P. W. Cattaneo and A. Chen and E. Costa and F. D'Ammando and G. Di Cocco and Y. Evangelista and M. Feroci and M. Galli and F. Gianotti and C. Labanti and I. Lapshov and F. Lazzarotto and P. Lipari and S. Mereghetti and E. Moretti and A. Morselli and L. Pacciani and A. Pellizzoni and F. Perotti and G. Piano and P. Picozza and M. Pilia and M. Prest and M. Rapisarda and A. Rappoldi and S. Sabatini and P. Soffitta and E. Striani and E. Vallazza and S. Vercellone and V. Vittorini and L. A. Antonelli and S. Cutini and C. Pittori and P. Santolamazza and F. Verrecchia and P. Giommi and L. Salotti},
journal= {arXiv preprint arXiv:1109.3018},
year = {2015}
}
Comments
8 pages, 5 figures. Accepted for publication by A&A. Final version after the correction by the language editor