2014A&A...567A..84M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:41:09

2014A&A...567A..84M - Astronomy and Astrophysics, volume 567A, 84-84 (2014/7-1)

GRB 120711A: an intense INTEGRAL burst with long-lasting soft γ-ray emission and a powerful optical flash.

MARTIN-CARRILLO A., HANLON L., TOPINKA M., LACLUYZE A.P., SAVCHENKO V., KANN D.A., TROTTER A.S., COVINO S., KRUEHLER T., GREINER J., McGLYNN S., MURPHY D., TISDALL P., MEEHAN S., WADE C., McBREEN B., REICHART D.E., FUGAZZA D., HAISLIP J.B., ROSSI A., SCHADY P., ELLIOTT J. and KLOSE S.

Abstract (from CDS):

A long and intense γ-ray burst (GRB) was detected by INTEGRAL on 11 July 2012 with a duration of ∼115s and fluence of 2.8x10–4erg/cm2 in the 20keV-8MeV energy range. GRB120711A was at z∼1.405 and produced soft γ-ray emission (>20keV) for at least ∼10ks after the trigger. The GRB was observed by several ground-based telescopes that detected a powerful optical flash peaking at an R-band brightness of ∼11.5mag at ∼126s after the trigger, or ∼9th magnitude when corrected for the host galaxy extinction (AV∼0.85). The X-ray afterglow was monitored by the Swift, XMM-Newton, and Chandra observatories from 8ks to 7Ms and provides evidence for a jet break at ∼0.9Ms. We present a comprehensive temporal and spectral analysis of the long-lasting soft γ-ray emission detected in the 20-200keV band with INTEGRAL/IBIS, the Fermi/LAT post-GRB detection above 100MeV, the soft X-ray afterglow and the optical/near-infrared detections from Watcher, Skynet/PROMPT, GROND, and REM. The prompt emission had a very hard spectrum (Epeak∼1MeV) and yields an Eγ,iso∼1054erg (1keV-10MeV rest frame), making GRB120711A one of the most energetic GRBs detected so far. We modelled the long-lasting soft γ-ray emission using the standard afterglow scenario, which indicates a forward shock origin. The combination of data extending from the near-infrared to GeV energies suggest that the emission is produced by a broken power-law spectrum consistent with synchrotron radiation. The afterglow is well modelled using a stratified wind-like environment with a density profile k∼1.2, suggesting a massive star progenitor (i.e. Wolf-Rayet) with a mass-loss rate between ∼10–5-10–6M/yr depending on the value of the radiative efficiency (ηγ=0.2 or 0.5). The analysis of the reverse and forward shock emission reveals an initial Lorentz factor of ∼120-340, a jet half-opening angle of ∼2°-5°, and a baryon load of ∼10–5-10–6M consistent with the expectations of the fireball model when the emission is highly relativistic. Long-lasting soft γ-ray emission from other INTEGRAL GRBs with high peak fluxes, such as GRB041219A, was not detected, suggesting that a combination of high Lorentz factor, emission above 100MeV, and possibly a powerful reverse shock are required. Similar long-lasting soft γ-ray emission has recently been observed from the nearby and extremely bright Fermi/LAT burst GRB130427A.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: individual: GRB 120711A - gamma-ray burst: individual: GRB 041219A - gamma-ray burst: individual: GRB 130427A

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GRB 101225A gB 00 00 47.48 +44 36 01.0           ~ 118 0
2 GRB 041219 gB 00 24 27.7 +62 50 34           ~ 206 1
3 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 431 1
4 SN 2011kl SN* 00 57 22.64 -46 48 03.6           SNSLSN 174 1
5 3B 940217 gB 01 56.3 +04 33           ~ 197 0
6 GRB 110918A gB 02 10 09.39 -27 06 19.6           ~ 66 0
7 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 136 0
8 GRB 130925A gB 02 44 42.38 -26 09 15.8           ~ 114 0
9 GRB 121027A gB 04 14 23.450 -58 49 47.17           ~ 95 0
10 GRB 980923 gB 05 07.8 -80 36           ~ 47 0
11 GRB 120711A gB 06 18 42.839 -70 59 56.78           ~ 72 0
12 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 247 0
13 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 287 0
14 SN 2013cq SN* 11 32 32.84 +27 41 56.2           SNIc 378 1
15 GRB 080723B gB 11 47 19.77 -60 14 27.9           ~ 43 0
16 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 421 0
17 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 963 1
18 GRB 060428C gB 19 00 52.0 -09 33 00           ~ 8 0
19 GRB 920723 gB 19 10 32 +27 17.8           ~ 42 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:41:09

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