2010MNRAS.402.2429C

Query : 2010MNRAS.402.2429C

2010MNRAS.402.2429C - Mon. Not. R. Astron. Soc., 402, 2429-2435 (2010/March-2)

The X-ray absorbing column densities of Swift gamma-ray bursts.

CAMPANA S., THONE C.C., DE UGARTE POSTIGO A., TAGLIAFERRI G., MORETTI A. and COVINO S.

Abstract (from CDS):

Long gamma-ray bursts (GRBs) are associated with the explosion of massive stars in star-forming regions. A large fraction of GRBs show intrinsic absorption as detected in optical spectra but absorption signatures are also detectable in the afterglow X-ray spectra. We present here a comprehensive analysis of the full sample of 93 GRBs with known redshift promptly observed by the Swift X-Ray Telescope (XRT) up to 2009 June. The distribution of X-ray column densities clearly shows that GRBs are heavily absorbed indicating that they indeed occur in dense environments. Furthermore, there is a lack of heavily absorbed GRBs at low redshift (z ≲ 1-2) that might therefore be candidates for the missing `dark' GRB population. However, there is no statistically significant correlation between the amount of X-ray absorption and the `darkness' of a GRB. Finally, we compare the hydrogen column densities derived in the optical with those derived from X-ray absorption. The two distributions are different, with the optical column densities being lower than the X-ray ones, which is even more apparent when correcting for metallicity effects. The most likely explanation is photoionization of hydrogen in the circumburst material caused by the radiation field of the burst.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): gamma-rays: bursts - X-rays: general

Simbad objects: 96

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Number of rows : 96
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 GRB 070110 gB 00 03 39.270 -52 58 27.00 21.8 21.9 21.2     ~ 200 0
2 GRB 070611 gB 00 07 58.000 -29 45 19.40           ~ 89 0
3 GRB 071031 gB 00 25 37.40 -58 03 33.9           ~ 166 0
4 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 469 0
5 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 173 0
6 GRB 081222 gB 01 30 57.76 -34 05 44.0           ~ 176 0
7 GRB 060908 gB 02 07 18.360 +00 20 31.20 16.99 18.34 16.85     ~ 199 0
8 GRB 080707 gB 02 10 28.48 +33 06 35.1           ~ 72 0
9 GRB 070721B gB 02 12 32.98 -02 11 39.8           ~ 116 0
10 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 153 0
11 GRB 080411 gB 02 31 54.82 -71 18 07.5           ~ 94 0
12 GRB 071112C gB 02 36 50.89 +28 22 16.9           ~ 148 0
13 GRB 060906 gB 02 43 00.900 +30 21 42.12     19.84     ~ 132 0
14 GRB 061007 gB 03 05 19.510 -50 30 02.50 14.28 14.40 12.95     ~ 289 1
15 GRB 070318 gB 03 13 56.830 -42 56 46.30 18.27 16.23 15.49     ~ 156 0
16 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 940 1
17 GRB 060115 gB 03 36 08.400 +17 20 43.00           ~ 167 0
18 GRB 060223A gB 03 40 49.560 -17 07 48.40     17.90     ~ 89 0
19 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 253 0
20 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 192 0
21 GRB 080913 gB 04 22 57.90 -25 07 38.6           ~ 193 0
22 GRB 060124 gB 05 08 25.900 +69 44 26.98   18.91 17.35     ~ 264 0
23 GRB 081118 gB 05 30 22.28 -43 18 03.1           ~ 71 0
24 GRB 050826 gB 05 51 01.590 -02 38 35.40           ~ 127 0
25 Fermi bn080928628 gB 06 20 16.85 -55 11 59.3           ~ 165 0
26 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 282 0
27 GRB 061222B gB 07 01 24.600 -25 51 36.00     19.87     ~ 80 0
28 GRB 070411 gB 07 09 19.930 +01 03 52.60     17.94     ~ 127 0
29 GRB 071020 gB 07 58 39.65 +32 51 38.8           ~ 151 0
30 GRB 081028 gB 08 07 34.40 +02 18 16.8           ~ 110 0
31 GRB 090102 gB 08 32 59.50 +33 06 25.7           ~ 221 0
32 GRB 051016B gB 08 48 27.810 +13 39 20.00 20.45         ~ 144 0
33 Fermi bn090516353 gB 09 12 59 -11 50.9           ~ 149 0
34 GRB 050505 gB 09 27 03.300 +30 16 23.70     20.74     ~ 191 0
35 Fermi bn090519881 gB 09 29 16.20 +00 11 23.9           ~ 86 0
36 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 326 0
37 GRB 070306 gB 09 52 23.220 +10 28 55.20           ~ 206 1
38 Fermi bn090423330 gB 09 55 33.19 +18 08 57.7           ~ 357 0
39 GRB 050319 gB 10 16 47.900 +43 32 53.80   18.02 17.01     ~ 258 0
40 GRB 080430 gB 11 01 14.63 +51 41 07.8           ~ 142 0
41 GRB 080330 gB 11 17 06.70 +30 36 24.1           ~ 133 0
42 GRB 080603B gB 11 46 07.46 +68 03 38.5           ~ 138 0
43 GRB 070419A gB 12 10 58.830 +39 55 34.06 18.52         ~ 118 0
44 GRB 050416 gB 12 33 54.600 +21 03 26.69     19.12     ~ 283 1
45 GRB 090424 gB 12 38 07.40 +16 49 45.9           ~ 238 0
46 GRB 070810A gB 12 39 51.18 +10 45 02.8           ~ 73 0
47 GRB 080607A gB 12 59 47.14 +15 55 09.6           ~ 235 0
48 GRB 060512 gB 13 03 05.810 +41 11 27.21 19.12 19.63 17.20     ~ 134 0
49 GRB 070208 gB 13 11 32.607 +61 57 54.37 20.79 20.79 19.86     ~ 108 0
50 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 313 0
51 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 313 0
52 GRB 090529 gB 14 09 52.49 +24 27 33.5           ~ 81 0
53 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 467 0
54 GRB 080310 gB 14 40 13.89 -00 10 30.4           ~ 189 0
55 GRB 090205 gB 14 43 40.00 -27 50 51.4           ~ 85 0
56 GRB 080721A gB 14 57 55.76 -11 43 24.9           ~ 164 0
57 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 192 0
58 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 269 0
59 GRB 081203A gB 15 32 07.6 +63 31 15           ~ 157 0
60 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 360 0
61 GRB 080604 gB 15 47 51.64 +20 33 28.5           ~ 65 0
62 GRB 060510B gB 15 56 29.200 +78 34 12.00           ~ 143 0
63 GRB 060502A gB 16 03 42.480 +66 36 02.49     18.65     ~ 131 0
64 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 335 0
65 GRB 080210 gB 16 45 04.03 +13 49 36.3           ~ 109 0
66 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 157 0
67 GRB 080605 gB 17 28 30.04 +04 00 56.9           ~ 176 0
68 GRB 060926 gB 17 35 43.660 +13 02 18.60     19.36     ~ 128 0
69 GRB 090418A gB 17 57 15.17 +33 24 21.1           ~ 87 0
70 GRB 071122 gB 18 26 25.26 +47 04 29.5           ~ 75 0
71 GRB 050126 gB 18 32 27.22 +42 22 14.2           ~ 124 0
72 SN 2005nc SN* 18 32 32.560 +26 20 22.34           SNIc: 382 1
73 Fermi bn081008832 gB 18 39 52.40 -57 25 58.8           ~ 197 0
74 GRB 080520 gB 18 40 46.50 -54 59 30.4           ~ 64 0
75 GRB 070529 gB 18 54 58.230 +20 39 34.00 20.38   17.25     ~ 88 0
76 GRB 080413A gB 19 09 11.73 -27 40 39.6           ~ 143 0
77 Fermi bn080905705 gB 20 06 57.93 -62 33 46.8           ~ 101 0
78 GRB 050315 gB 20 25 54.100 -42 36 02.19           ~ 215 0
79 GRB 080805 gB 20 56 55.30 -62 25 58.8           ~ 92 0
80 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 282 0
81 GRB 060605 gB 21 28 37.320 -06 03 31.30   20.12 16.53     ~ 193 0
82 GRB 060522 gB 21 31 44.850 +02 53 10.80           ~ 131 0
83 GRB 061110B gB 21 35 40.400 +06 52 34.10           ~ 84 0
84 GRB 080413B gB 21 44 34.62 -19 58 51.2           ~ 168 0
85 Fermi bn080804972 gB 21 54 41.90 -53 11 20.2           ~ 137 0
86 GRB 060927A gB 21 58 11.930 +05 21 50.32           ~ 196 0
87 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 295 0
88 GRB 051109A gB 22 01 15.320 +40 49 23.70   20.09 20.14     ~ 173 0
89 Fermi bn080916406 gB 22 25 09.30 -57 01 33.7           ~ 157 0
90 GRB 061110A gB 22 25 09.800 -02 15 30.70 21.43         ~ 126 0
91 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 386 0
92 SN 2008hw SN* 22 39 50.39 -40 08 49.1           SNIc 174 1
93 GRB 070506 gB 23 08 52.390 +10 43 20.30     19.04     ~ 79 0
94 GRB 050803 gB 23 22 37.910 +05 47 09.00           ~ 116 0
95 Fermi bn080810549 gB 23 47 08.00 +00 18 35.1           ~ 213 0
96 GRB 060707 gB 23 48 19.000 -17 54 17.00     19.79     ~ 158 0

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