2012A&A...539A...3B

Query : 2012A&A...539A...3B

2012A&A...539A...3B - Astronomy and Astrophysics, volume 539A3-3 (2012/3-1)

The X-ray light curve of gamma-ray bursts: clues to the central engine.

BERNARDINI M.G., MARGUTTI R., MAO J., ZANINONI E. and CHINCARINI G.

Abstract (from CDS):

We present the analysis of a large sample of gamma-ray burst (GRB) X-ray light curves in the rest frame to characterise their intrinsic properties in the context of different theoretical scenarios. We determine the morphology, timescales, and energetics of 64 long GRBs observed by Swift/XRT without flaring activity. We furthermore provide a one-to-one comparison to the properties of GRBs with X-ray flares. We find that the steep decay morphology and its connection with X-ray flares favour a scenario in which a central engine origin. We show that this scenario can also account for the shallow decay phase, provided that the GRB progenitor star has a self-similar structure with a constant envelope-to-core mass ratio ∼0.02-0.03. However, difficulties arise for very long duration (tp>104s) shallow phases. Alternatively, a spinning-down magnetar whose emitted power refreshes the forward shock can quantitatively account for the shallow decay properties. In particular we demonstrate that this model can account for the plateau luminosity vs. end time anticorrelation.

Abstract Copyright: ∼

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

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 070611 gB 00 07 58.000 -29 45 19.40           ~ 94 0
2 GRB 060708 gB 00 31 13.850 -33 45 32.40 19.07 19.79 17.37     ~ 109 0
3 GRB 081222 gB 01 30 57.76 -34 05 44.0           ~ 199 0
4 GRB 080707 gB 02 10 28.48 +33 06 35.1           ~ 83 0
5 SN 2009nz SN* 02 26 19.87 -18 57 08.6           ~ 307 1
6 GRB 080411 gB 02 31 54.82 -71 18 07.5           ~ 109 0
7 GRB 091029 gB 04 00 40.00 -55 57 12.7           ~ 168 0
8 GRB 081118 gB 05 30 22.28 -43 18 03.1           ~ 79 0
9 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 303 0
10 GRB 061222B gB 07 01 24.600 -25 51 36.00     19.87     ~ 87 0
11 GRB 070411 gB 07 09 19.930 +01 03 52.60     17.94     ~ 138 0
12 GRB 071020 gB 07 58 39.65 +32 51 38.8           ~ 158 0
13 GRB 090102 gB 08 32 59.50 +33 06 25.7           ~ 253 0
14 GRB 051016B gB 08 48 27.810 +13 39 20.00 20.45         ~ 153 0
15 GRB 061021 gB 09 40 36.120 -21 57 05.40 18.21 19.20 16.82     ~ 160 0
16 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 350 0
17 GRB 070306 gB 09 52 23.220 +10 28 55.20           ~ 222 1
18 Fermi bn091020900 gB 11 42 55.20 +50 58 42.0           ~ 188 0
19 GRB 090424 gB 12 38 07.40 +16 49 45.9           ~ 269 0
20 Fermi bn090323002 gB 12 42 50.28 +17 03 11.9           ~ 244 1
21 GRB 050801 gB 13 36 35.000 -21 55 41.00 15.03 15.82 15.46     ~ 164 0
22 GRB 090529 gB 14 09 52.49 +24 27 33.5           ~ 89 0
23 GRB 080310 gB 14 40 13.89 -00 10 30.4           ~ 214 0
24 GRB 080721A gB 14 57 55.76 -11 43 24.9           ~ 180 0
25 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 209 0
26 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 288 0
27 GRB 081203A gB 15 32 07.6 +63 31 15           ~ 177 0
28 GRB 080604 gB 15 47 51.64 +20 33 28.5           ~ 71 0
29 GRB 060510B gB 15 56 29.200 +78 34 12.00           ~ 155 0
30 GRB 090814A gB 15 58 26.44 +25 37 52.4           ~ 56 0
31 GRB 060502A gB 16 03 42.480 +66 36 02.49     18.65     ~ 143 0
32 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 348 0
33 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 174 0
34 SN 2005nc SN* 18 32 32.560 +26 20 22.34           SNIc: 400 1
35 GRB 090618 gB 19 36 01.80 +78 21 07.1           ~ 358 0
36 GRB 100425A gB 19 56 47.16 -26 25 50.5           ~ 91 0
37 Fermi bn080905705 gB 20 06 57.93 -62 33 46.8           ~ 119 0
38 GRB 071003 gB 20 07 24.50 +10 56 48.8           ~ 181 0
39 GRB 100621A gB 21 01 13.12 -51 06 22.5           ~ 204 0
40 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 301 0
41 GRB 060605 gB 21 28 37.320 -06 03 31.30   20.12 16.53     ~ 210 0
42 GRB 080413B gB 21 44 34.62 -19 58 51.2           ~ 191 0
43 Fermi bn080804972 gB 21 54 41.90 -53 11 20.2           ~ 158 0
44 GRB 051221 G 21 54 48.626 +16 53 27.16 19.49         ~ 377 0
45 GRB 060927A gB 21 58 11.930 +05 21 50.32           ~ 215 0
46 GRB 051109A gB 22 01 15.320 +40 49 23.70   20.09 20.14     ~ 190 0
47 GRB 071117 gB 22 20 10.40 -63 26 36.6           ~ 112 0
48 Fermi bn090927422 gB 22 55 53.41 -70 58 49.3           ~ 112 0
49 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 223 0

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