2011A&A...526A..23S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:21:42

2011A&A...526A..23S - Astronomy and Astrophysics, volume 526A, 23-23 (2011/2-1)

The circumburst density profile around GRB progenitors: a statistical study.

SCHULZE S., KLOSE S., BJOERNSSON G., JAKOBSSON P., KANN D.A., ROSSI A., KRUEHLER T., GREINER J. and FERRERO P.

Abstract (from CDS):

According to our present understanding, long gamma-ray bursts (GRBs) originate from the collapse of massive stars, while short bursts are caused by to the coalescence of compact stellar objects. Because the afterglow evolution is determined by the circumburst density profile, n(r), traversed by the fireball, it can be used to distinguish between a constant density medium, n(r)=const., and a free stellar wind, n(r) ∝r–2. Our goal is to derive the most probable circumburst density profile for a large number of Swift-detected bursts using well-sampled afterglow light curves in the optical and X-ray bands. We combined all publicly available optical and Swift/X-ray afterglow data from June 2005 to September 2009 to find the best-sampled late-time afterglow light curves. After applying several selection criteria, our final sample consists of 27 bursts, including one short burst. The afterglow evolution was then studied within the framework of the fireball model. We find that the majority (18) of the 27 afterglow light curves are compatible with a constant density medium (ISM case). Only 6 of the 27 afterglows show evidence of a wind profile at late times. In particular, we set upper limits on the wind termination-shock radius, RT, for GRB fireballs that are propagating into an ISM profile and lower limits on RT for those that were found to propagate through a wind medium. Observational evidence for ISM profiles dominates in GRB afterglow studies, implying that most GRB progenitors might have relatively small wind termination-shock radii. A smaller group of progenitors, however, seems to be characterised by significantly more extended wind regions.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - ISM: structure - radiation mechanisms: non-thermal

Simbad objects: 33

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Number of rows : 33

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 080710 gB 00 33 05.68 +19 30 05.8           ~ 103 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
3 GRB 060908 gB 02 07 18.360 +00 20 31.20 16.99 18.34 16.85     ~ 175 0
4 GRB 000911 gB 02 18 42 +07 48.0           ~ 147 0
5 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 136 0
6 GRB 050603 gB 02 39 56.839 -25 10 54.92     18.48     ~ 148 0
7 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 162 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
9 GRB 090328 gB 06 02 39.69 -41 52 55.1           ~ 140 1
10 GRB 070411 gB 07 09 19.930 +01 03 52.60     17.94     ~ 113 0
11 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 315 0
12 GRB 090102 gB 08 32 59.50 +33 06 25.7           ~ 184 0
13 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1117 2
14 GRB 070810A gB 12 39 51.18 +10 45 02.8           ~ 62 0
15 GRB 090323 gB 12 42 50.28 +17 03 11.9           ~ 183 1
16 GRB 060512 gB 13 03 05.810 +41 11 27.21 19.12 19.63 17.20     ~ 120 0
17 GRB 050801 gB 13 36 35.000 -21 55 41.00 15.03 15.82 15.46     ~ 140 0
18 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 421 0
19 GRB 080721 gB 14 57 55.76 -11 43 24.9           ~ 140 0
20 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 164 0
21 GRB 081203A gB 15 32 07.6 +63 31 15           ~ 132 0
22 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 322 1
23 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
24 GRB 090726 gB 16 34 43.50 +72 51 56.5           ~ 52 0
25 GRB 090902B gB 17 39 45.26 +27 19 28.1           ~ 327 0
26 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1650 2
27 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 250 0
28 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 507 1
29 GRB 080514B gB 21 31 22.61 +00 42 30.3           ~ 58 0
30 GRB 051221 gB 21 54 48.626 +16 53 27.16 19.49         ~ 307 1
31 GRB 051109A gB 22 01 15.320 +40 49 23.70   20.09 20.14     ~ 148 0
32 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 338 1
33 GRB 090926A gB 23 33 36.18 -66 19 25.9           ~ 250 0

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2020.07.08-03:21:42

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