2012MNRAS.420..405K

Query : 2012MNRAS.420..405K

2012MNRAS.420..405K - Mon. Not. R. Astron. Soc., 420, 405-415 (2012/February-2)

On multiple classes of gamma-ray bursts, as deduced from autocorrelation functions or bivariate duration/hardness ratio distributions.

KOEN C. and BERE A.

Abstract (from CDS):

Autocorrelation functions (ACFs) of 119 gamma-ray bursts (GRBs) monitored by the Burst Alert Telescope (BAT) on Swift are calculated. Contrasting with previous results for smaller numbers of bursts from other missions, the widths of the ACFs are not bimodally distributed. Although the distribution appears slightly asymmetrical, underlying mixtures of distributions can also probably be ruled out. Factors contributing to differences between the results presented here, and those in the literature, may include the differences in energy passbands used, and the superior sensitivity of the BAT instrument (which affects e.g. the redshift distribution of the detected GRB). The second part of the paper is concerned with the fitting of mixtures of bivariate Gaussians to the joint duration/hardness ratio data of 325 GRBs. A careful analysis confirms that a three-component mixture is the statistically most acceptable, but it is shown that the implied marginal distribution of the hardness ratios does not fit the data very well. It is also stressed that mixture components cannot automatically be assumed to represent different classes of GRBs. The point is illustrated by showing two substantially different, but statistically almost equivalent, mixture models for the distribution of 571 BAT-determined GRB durations.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): methods: statistical - gamma-ray burst: general

Simbad objects: 119

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Number of rows : 119
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     ~ 201 0
2 GRB 070611 gB 00 07 58.000 -29 45 19.40           ~ 89 0
3 GRB 060912A gB 00 21 08.11 +20 58 18.9           ~ 103 1
4 GRB 071031 gB 00 25 37.40 -58 03 33.9           ~ 166 0
5 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 470 0
6 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 173 0
7 Fermi bn100814160 gB 01 29 53.61 -17 59 43.6           ~ 192 0
8 GRB 081222 gB 01 30 57.76 -34 05 44.0           ~ 176 0
9 GRB 100906A gB 01 54 44.19 +55 37 49.8           ~ 199 0
10 Fermi bn091208410 gB 01 57 38.50 +16 52 50.7           ~ 191 0
11 GRB 060908 gB 02 07 18.360 +00 20 31.20 16.99 18.34 16.85     ~ 199 0
12 GRB 091018 gB 02 08 46 -57 33.0           ~ 143 0
13 GRB 080707 gB 02 10 28.48 +33 06 35.1           ~ 72 0
14 GRB 070721B gB 02 12 32.98 -02 11 39.8           ~ 116 0
15 SN 2009nz SN* 02 26 19.87 -18 57 08.6           ~ 273 1
16 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 153 0
17 GRB 080411 gB 02 31 54.82 -71 18 07.5           ~ 94 0
18 GRB 050603 gB 02 39 56.839 -25 10 54.92     18.48     ~ 165 0
19 Fermi bn100728439 gB 02 56 13.44 +00 16 51.6           ~ 121 0
20 Fermi bn090926914 gB 03 05 14.30 -38 59 50.9           ~ 131 1
21 GRB 061007 gB 03 05 19.510 -50 30 02.50 14.28 14.40 12.95     ~ 289 1
22 GRB 070318 gB 03 13 56.830 -42 56 46.30 18.27 16.23 15.49     ~ 156 0
23 GRB 060115 gB 03 36 08.400 +17 20 43.00           ~ 167 0
24 GRB 060223A gB 03 40 49.560 -17 07 48.40     17.90     ~ 89 0
25 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 253 0
26 GRB 070714B gB 03 51 22.30 +28 17 51.3           ~ 216 1
27 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 192 0
28 GRB 091029 gB 04 00 40.00 -55 57 12.7           ~ 147 0
29 GRB 080913 gB 04 22 57.90 -25 07 38.6           ~ 193 0
30 GRB 050826 gB 05 51 01.590 -02 38 35.40           ~ 127 0
31 GRB 081121 gB 05 57 07.70 -60 36 42.1           ~ 132 0
32 Fermi bn080928628 gB 06 20 16.85 -55 11 59.3           ~ 165 0
33 GRB 061222B gB 07 01 24.600 -25 51 36.00     19.87     ~ 80 0
34 GRB 070411 gB 07 09 19.930 +01 03 52.60     17.94     ~ 127 0
35 GRB 071020 gB 07 58 39.65 +32 51 38.8           ~ 151 0
36 GRB 070612A gB 08 05 28.530 +37 16 09.57           ~ 73 0
37 GRB 081028 gB 08 07 34.40 +02 18 16.8           ~ 110 0
38 GRB 090102 gB 08 32 59.50 +33 06 25.7           ~ 221 0
39 GRB 051016B gB 08 48 27.810 +13 39 20.00 20.45         ~ 144 0
40 GRB 050505 gB 09 27 03.300 +30 16 23.70     20.74     ~ 191 0
41 GRB 061021 gB 09 40 36.120 -21 57 05.40 18.21 19.20 16.82     ~ 145 0
42 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 326 0
43 GRB 070306 gB 09 52 23.220 +10 28 55.20           ~ 206 1
44 Fermi bn090423330 gB 09 55 33.19 +18 08 57.7           ~ 357 0
45 GRB 071010B gB 10 02 09.20 +45 43 52.2           ~ 160 0
46 GRB 050319 gB 10 16 47.900 +43 32 53.80   18.02 17.01     ~ 258 0
47 GRB 100316B gB 10 54 00 -45 28.0           ~ 53 0
48 GRB 080430 gB 11 01 14.63 +51 41 07.8           ~ 142 0
49 GRB 080330 gB 11 17 06.70 +30 36 24.1           ~ 133 0
50 Fermi bn091020900 gB 11 42 55.20 +50 58 42.0           ~ 164 0
51 GRB 060319 gB 11 45 33.050 +60 00 39.61 20.10         ~ 67 0
52 GRB 080603B gB 11 46 07.46 +68 03 38.5           ~ 138 0
53 GRB 050416 gB 12 33 54.600 +21 03 26.69     19.12     ~ 283 1
54 GRB 090424 gB 12 38 07.40 +16 49 45.9           ~ 238 0
55 GRB 070810A gB 12 39 51.18 +10 45 02.8           ~ 73 0
56 GRB 080607A gB 12 59 47.14 +15 55 09.6           ~ 235 0
57 GRB 060512 gB 13 03 05.810 +41 11 27.21 19.12 19.63 17.20     ~ 134 0
58 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 313 0
59 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 313 0
60 GRB 050802 gB 14 37 05.820 +27 47 12.62 16.85 17.38 16.97     ~ 173 0
61 GRB 080310 gB 14 40 13.89 -00 10 30.4           ~ 189 0
62 GRB 060814 gB 14 45 21.480 +20 35 11.80           ~ 218 0
63 GRB 080721A gB 14 57 55.76 -11 43 24.9           ~ 164 0
64 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 192 0
65 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 269 0
66 GRB 081203A gB 15 32 07.6 +63 31 15           ~ 157 0
67 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 360 0
68 GRB 060510B gB 15 56 29.200 +78 34 12.00           ~ 143 0
69 GRB 060502A gB 16 03 42.480 +66 36 02.49     18.65     ~ 131 0
70 GRB 070521 gB 16 10 38.600 +30 15 22.70           ~ 149 0
71 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 335 0
72 GRB 080210 gB 16 45 04.03 +13 49 36.3           ~ 109 0
73 GRB 090715B gB 16 45 21.59 +44 50 20.1           ~ 124 0
74 GRB 100418A gB 17 05 26.96 +11 27 41.9           ~ 180 0
75 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 157 0
76 GRB 080605 gB 17 28 30.04 +04 00 56.9           ~ 176 0
77 GRB 060926 gB 17 35 43.660 +13 02 18.60     19.36     ~ 128 0
78 GRB 090418A gB 17 57 15.17 +33 24 21.1           ~ 87 0
79 GRB 050223 gB 18 05 32.200 -62 28 20.40           ~ 106 0
80 GRB 050126 gB 18 32 27.22 +42 22 14.2           ~ 124 0
81 SN 2005nc SN* 18 32 32.560 +26 20 22.34           SNIc: 382 1
82 Fermi bn081008832 gB 18 39 52.40 -57 25 58.8           ~ 197 0
83 GRB 080520 gB 18 40 46.50 -54 59 30.4           ~ 64 0
84 GRB 070529 gB 18 54 58.230 +20 39 34.00 20.38   17.25     ~ 88 0
85 GRB 080413A gB 19 09 11.73 -27 40 39.6           ~ 143 0
86 GRB 090618 gB 19 36 01.80 +78 21 07.1           ~ 320 0
87 GRB 100425A gB 19 56 47.16 -26 25 50.5           ~ 75 0
88 Fermi bn080905705 gB 20 06 57.93 -62 33 46.8           ~ 101 0
89 GRB 071003 gB 20 07 24.50 +10 56 48.8           ~ 170 0
90 GRB 050315 gB 20 25 54.100 -42 36 02.19           ~ 215 0
91 GRB 070508 gB 20 51 11.810 -78 23 04.88     19.62     ~ 131 0
92 GRB 080805 gB 20 56 55.30 -62 25 58.8           ~ 92 0
93 GRB 100621A gB 21 01 13.12 -51 06 22.5           ~ 184 0
94 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 282 0
95 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 614 1
96 GRB 060605 gB 21 28 37.320 -06 03 31.30   20.12 16.53     ~ 193 0
97 GRB 060522 gB 21 31 44.850 +02 53 10.80           ~ 131 0
98 GRB 061110B gB 21 35 40.400 +06 52 34.10           ~ 84 0
99 GRB 080413B gB 21 44 34.62 -19 58 51.2           ~ 168 0
100 Fermi bn080804972 gB 21 54 41.90 -53 11 20.2           ~ 137 0
101 GRB 060927A gB 21 58 11.930 +05 21 50.32           ~ 196 0
102 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 295 0
103 GRB 051109A gB 22 01 15.320 +40 49 23.70   20.09 20.14     ~ 173 0
104 GRB 060505 gB 22 07 03.440 -27 48 51.89           ~ 259 1
105 GRB 071117 gB 22 20 10.40 -63 26 36.6           ~ 101 0
106 Fermi bn080916406 gB 22 25 09.30 -57 01 33.7           ~ 157 0
107 GRB 061110A gB 22 25 09.800 -02 15 30.70 21.43         ~ 126 0
108 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 386 0
109 Fermi bn091024380 gB 22 37 +56.9           ~ 131 0
110 SN 2008hw SN* 22 39 50.39 -40 08 49.1           SNIc 174 1
111 Fermi bn090927422 gB 22 55 53.41 -70 58 49.3           ~ 95 0
112 GRB 051109B gB 23 01 50.330 +38 40 46.51           ~ 85 0
113 GRB 070506 gB 23 08 52.390 +10 43 20.30     19.04     ~ 79 0
114 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 206 0
115 Fermi bn100816026 gB 23 26 57.56 +26 34 42.6           ~ 149 0
116 GRB 090812 gB 23 32 48.5 -10 36 17           ~ 143 0
117 Fermi bn080810549 gB 23 47 08.00 +00 18 35.1           ~ 213 0
118 GRB 060707 gB 23 48 19.000 -17 54 17.00     19.79     ~ 158 0
119 GRB 061222A gB 23 53 03.419 +46 31 58.60           ~ 158 0

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