2009A&A...498..671X


Query : 2009A&A...498..671X

2009A&A...498..671X - Astronomy and Astrophysics, volume 498, 671-676 (2009/5-2)

The initial Lorentz factors of fireballs inferred from the early X-ray data of Swift GRBs.

XUE R.-R., FAN Y.-Z. and WEI D.-M.

Abstract (from CDS):

We intend to determine the type of circumburst medium and directly measure the initial Lorentz factor Γ0 of GRB outflows. If the early X-ray afterglow light curve has a peak and the whole profile across the peak is consistent with the standard external shock model, the early rise profile of light curves can be used to differentiate whether the burst was born in the interstellar medium (ISM) or in a stellar wind. In the thin shell case related to a subrelativistic reverse shock, the peak time occurring after the end of the prompt emission can be used to derive an accurate Γ0, especially for the ISM case. The afterglow light curves for a flat electron spectrum 1<p<2 have been derived analytically. In our GRB sample, we obtained Γ0∼300 for the bursts born in ISM. We did not find any good case for bursts born in stellar wind and behaving as a thin shell that can be used to constrain Γ0 reliably.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - ISM: jets and outflows - radiation mechanisms: non-thermal

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Fermi bn090113778 gB 02 08 16.00 +33 26 08.4           ~ 74 0
2 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 897 1
3 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 632 1
4 GRB 080409 gB 05 37 19.20 +05 05 05.1           ~ 33 0
5 SN 2003lw SN* 08 02 30.1 -39 51 03       20.23   SNIc: 526 0
6 GRB 080307 gB 09 06 30.73 +35 08 19.8           ~ 50 0
7 GRB 060801 gB 14 12 01.290 +16 58 54.00           ~ 150 0
8 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 976 1
9 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 346 0
10 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 147 0
11 GRB 060926 gB 17 35 43.660 +13 02 18.60     19.36     ~ 125 0
12 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1756 2
13 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 552 1
14 GRB 080413B gB 21 44 34.62 -19 58 51.2           ~ 159 0
15 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 283 0
16 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 198 0

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2022.11.28-13:43:01

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