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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29148
Title: Evidence of two spectral breaks in the prompt emission of gamma-ray bursts
Authors: Ravasio, M. E.
GHIRLANDA, Giancarlo 
Nava, Lara 
GHISELLINI, Gabriele 
Issue Date: 2019
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 625
First Page: A60
Abstract: The long-lasting tension between the observed spectra of gamma-ray bursts (GRBs) and the predicted synchrotron emission spectrum might be solved if electrons do not completely cool. Evidence of incomplete cooling was recently found in Swift GRBs with prompt observations down to 0.1 keV, and in one bright Fermi burst, GRB 160625B. Here we systematically search for evidence of incomplete cooling in the spectra of the ten brightest short and long GRBs observed by Fermi. We find that in eight out of ten long GRBs there is compelling evidence of a low-energy break (below the peak energy) and good agreement with the photon indices of the synchrotron spectrum (respectively -2/3 and -3/2 below the break and between the break and the peak energy). Interestingly, none of the ten short GRBs analysed shows a break, but the low-energy spectral slope is consistent with -2/3. In a standard scenario, these results imply a very low magnetic field in the emission region (B'∼10 G in the comoving frame), at odd with expectations.
URI: http://hdl.handle.net/20.500.12386/29148
URL: https://www.aanda.org/articles/aa/abs/2019/05/aa34987-18/aa34987-18.html
https://arxiv.org/abs/1903.02555
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201834987
Bibcode ADS: 2019A&A...625A..60R
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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