2019A&A...625A..60R


Query : 2019A&A...625A..60R

2019A&A...625A..60R - Astronomy and Astrophysics, volume 625A, 60-60 (2019/5-1)

Evidence of two spectral breaks in the prompt emission of gamma-ray bursts.

RAVASIO M.E., GHIRLANDA G., NAVA L. and GHISELLINI G.

Abstract (from CDS):

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 0.1keV, 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'∼10G in the comoving frame), at odd with expectations.

Abstract Copyright: © ESO 2019

Journal keyword(s): radiation mechanisms: non-thermal - gamma rays: general

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GRB 180720A gB 00 02 06.70 -02 55 01.2           ~ 6 0
2 GRB 090227A gB 00 13.2 -43 00           ~ 23 0
3 GRB 120624A gB 00 19 +07.2           ~ 16 0
4 GRB 101014A gB 01 47.8 -51 04           ~ 21 0
5 GRB 150819A gB 02 49 19.94 +09 48 26.9           ~ 14 0
6 GRB 171010A gB 04 26 19.42 -10 27 47.7           ~ 45 0
7 GRB 090228 gB 07 07.2 -24 18           ~ 39 0
8 GRB 110205A gB 10 58 31.12 +67 31 31.2           ~ 156 0
9 GRB 160821A gB 11 25 01 +42 20.7           ~ 29 0
10 SN 2013cq SN* 11 32 32.84 +27 41 56.2           SNIc 412 1
11 GRB 170127A gB 11 37 26.33 -45 50 08.3           ~ 10 0
12 GRB 160625A gB 11 47 39.73 -65 08 40.8           ~ 11 0
13 GRB 100724A gB 12 58 10.37 -11 06 09.3           ~ 54 0
14 GRB 170206A gB 14 11 09.60 +14 28 48.0           ~ 12 0
15 GRB 130606A gB 16 37 35.12 +29 47 46.4           ~ 125 0
16 GRB 090902B gB 17 39 45.26 +27 19 28.1           ~ 343 0
17 GRB 130504A gB 18 09 49.48 -16 18 48.8           ~ 16 0
18 GRB 090618 gB 19 36 01.80 +78 21 07.1           ~ 283 0
19 GRB 160625B gB 20 34 23.55 +06 55 09.5           ~ 111 0
20 GRB 120323A gB 22 42 +29.7           ~ 40 0
21 GRB 130701A gB 23 48 55.05 +36 06 01.3           ~ 57 0
22 GRB 170409A gB ~ ~           ~ 8 0
23 GRB 171227A gB ~ ~           ~ 7 0

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2021.09.24-23:27:37

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