2007ApJ...663..407B


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.22CET19:46:37

2007ApJ...663..407B - Astrophys. J., 663, 407-419 (2007/July-1)

X-ray hardness evolution in GRB afterglows and flares: late-time GRB activity without NHVariations.

BUTLER N.R. and KOCEVSKI D.

Abstract (from CDS):

We show that the X-ray and γ-ray spectra of Swift GRBs and their afterglows are consistent with the emission characteristic of an expanding, relativistic fireball. The classical afterglow due to the impact of the fireball on the external medium is often not observed until 1 to several hours after the GRB. Focusing on GRBs 061121, 060614, and 060124, but generalizing to the full (>50 Ms XRT exposure) Swift sample up to and including GRB 061210, we show that the early emission in >90% of early afterglows has a characteristic νFν spectral energy Epeak, which likely evolves from the γ-rays through the soft X-ray band on timescales of 102-104 s after the GRB. The observed spectra are strongly curved when plotted with logarithmic axes and have often been incorrectly fitted in other studies with a time-varying soft X-ray absorption. The spectral evolution inferred from fitting instead models used to fit GRBs demonstrates a common evolution–a power-law hardness-intensity correlation and hard-to-soft evolution–for GRBs and the early X-ray afterglows and X-ray flares. Combined with studies of short-timescale variability, our findings indicate a central engine active for longer than previously suspected. The GRB spectra are observed to become very soft at late times due to an intrinsic spectral evolution and due to the surprising faintness of some afterglows. We discuss models for the early X-ray emission.

Abstract Copyright:

Journal keyword(s): Gamma Rays: Bursts - Stars: Supernovae: General - X-Rays: General

Simbad objects: 27

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Number of rows : 27

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 050904 gB 00 54 50.794 +14 05 09.42           ~ 433 0
2 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 841 1
3 GRB 050822 gB 03 24 27.240 -46 01 59.20     20.82     ~ 96 0
4 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 226 0
5 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 166 0
6 GRB 060124 gB 05 08 25.900 +69 44 26.98   18.91 17.35     ~ 239 0
7 GRB 050712 gB 05 10 48.100 +64 54 47.60 19.09   17.86     ~ 61 0
8 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 254 0
9 GRB 051227 gB 08 20 58.107 +31 55 32.01           ~ 111 0
10 GRB 050502B gB 09 30 10.024 +16 59 48.07           ~ 150 0
11 GRB 061210 gB 09 38 05.270 +15 37 17.30           ~ 116 0
12 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 291 0
13 GRB 050714B gB 11 18 47.610 -15 32 48.90           ~ 66 0
14 GRB 060204B gB 14 07 14.900 +27 40 36.40           ~ 75 0
15 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 285 0
16 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 167 0
17 GRB 051117A gB 15 13 34.020 +30 52 12.30 18.66 19.81       ~ 62 0
18 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 237 0
19 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 325 0
20 GRB 060904A gB 15 50 54.560 +44 59 10.51           ~ 68 0
21 GRB 050724 gB 16 24 44.400 -27 32 27.90     19.70     ~ 389 1
22 GRB 060929 gB 17 32 28.920 +29 50 06.20           ~ 52 0
23 GRB 060111A gB 18 24 49.132 +37 36 14.47     18.86     ~ 58 0
24 GRB 050607 gB 20 00 42.790 +09 08 31.50   19.55 18.94     ~ 86 0
25 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 515 1
26 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 262 0
27 GRB 050716 gB 22 34 20.730 +38 41 03.60   21.52 20.32     ~ 68 0

    Equat.    Gal    SGal    Ecl

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