2008MNRAS.383.1049N

Query : 2008MNRAS.383.1049N

2008MNRAS.383.1049N - Mon. Not. R. Astron. Soc., 383, 1049-1057 (2008/January-3)

Optical afterglows of gamma-ray bursts: a bimodal distribution?

NARDINI M., GHISELLINI G. and GHIRLANDA G.

Abstract (from CDS):

The luminosities of the optical afterglows of gamma-ray bursts, 12 h (rest-frame time) after the trigger, show a surprising clustering, with a minority of events being at a significantly smaller luminosity. If real, this dichotomy would be a crucial clue to understand the nature of optically dark afterglows, i.e. bursts that are detected in the X-ray band, but not in the optical. We investigate this issue by studying bursts of the pre-Swift era, both detected and undetected in the optical. The limiting magnitudes of the undetected ones are used to construct the probability that a generic burst is observed down to a given magnitude limit. Then, by simulating a large number of bursts with pre-assigned characteristics, we can compare the properties of the observed optical luminosity distribution with the simulated one. Our results suggest that the hints of bimodality present in the observed distribution reflect a real bimodality: either the optical luminosity distribution of bursts is intrinsically bimodal, or there exists a population of bursts with a quite significant grey absorption, i.e. wavelength-independent extinction. This population of intrinsically weak or grey-absorbed events can be associated with dark bursts.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): radiation mechanisms: non-thermal - dust, extinction - gamma-rays: bursts

Simbad objects: 97

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Number of rows : 97
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 030204 gB 00 03 20 +32 43.0           ~ 12 0
2 GRB 030824 gB 00 05 02 +19 55.6           ~ 23 0
3 GRB 000529 gB 00 09 48.3 -61 27 53           ~ 17 0
4 GRB 021016 gB 00 11 04 +49 08.3           ~ 16 0
5 GRB 041015 gB 00 18 46 +66 51.2           ~ 19 0
6 GRB 011019 gB 00 42.8 -12 27           ~ 19 0
7 GRB 021113 gB 01 33 54 +40 27.7           ~ 20 0
8 GRB 041016 gB 01 45 24 -04 39.5           ~ 15 0
9 GRB 990627 gB 01 48 25.4 -77 04 38           ~ 19 1
10 GRB 000210 gB 01 59 15 -40 40.0           ~ 175 0
11 GRB 000607 gB 02 33 58.7 +17 08 51           ~ 25 1
12 GRB 021112 gB 02 36 52 +48 50.9           ~ 22 0
13 GRB 010220 gB 02 36 59.0 +61 46 00           ~ 40 0
14 GRB 001204 gB 02 41 08.6 +12 53 46           ~ 20 1
15 GRB 990217 gB 03 02 52.3 -53 05 37           ~ 29 0
16 GRB 990806 gB 03 10.5 -68 07           ~ 36 0
17 GRB 031026 gB 03 18.7 +28 22           ~ 21 0
18 GRB 981220 gB 03 42 33.8 +17 09 00           ~ 48 0
19 GRB 031111 gB 04 47 03.0 +18 06 00           ~ 22 0
20 GRB 011212 gB 05 00 05 +32 07.6           ~ 21 0
21 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 650 1
22 GRB 000307 gB 05 55 +05.8           ~ 18 0
23 GRB 041211 gB 06 43 12.0 +20 23 42           ~ 18 0
24 GRB 001212 gB 06 49.6 +36 23           ~ 12 0
25 GRB 991014 gB 06 51 03.0 +11 36 05           ~ 41 0
26 GRB 000424B gB 06 58 52.3 +49 52 23           ~ 24 0
27 GRB 010324 gB 07 11.1 +20 05           ~ 14 0
28 GRB 990907 gB 07 33.7 -69 47           ~ 20 0
29 GRB 000620 gB 07 35 17.2 +69 11 35           ~ 19 0
30 GRB 040403 gB 07 40 54 +68 12.9           ~ 18 1
31 GRB 000126 gB 07 45 00.0 +07 44 30           ~ 18 0
32 GRB 030414 gB 07 59.0 -48 35           ~ 9 0
33 GRB 000115 gB 08 03 30.0 -17 13 30           ~ 29 0
34 GRB 010103 gB 08 03.8 -16 07           ~ 5 0
35 GRB 021201 gB 08 07 49.3 +21 12 32           ~ 25 0
36 GRB 020127 gB 08 15 05.8 +36 44 31           ~ 66 0
37 GRB 001025 gB 08 36.6 -13 04           ~ 48 1
38 GRB 020409 gB 08 45 +66.7           ~ 18 0
39 GRB 000408B gB 08 53 +68.8           ~ 19 0
40 GRB 020418 gB 09 39 06 +76 35.6           ~ 13 1
41 GRB 010126 gB 10 06 02 +64 53.6           ~ 15 0
42 GRB 040228 gB 10 12 12.0 -07 19 33           ~ 11 0
43 GRB 010213 gB 10 31 36.0 +05 30 39           ~ 23 0
44 GRB 000528 gB 10 45 08.0 -33 59 26           ~ 29 0
45 GRB 030416 gB 11 06 51 -02 53.0           ~ 14 0
46 GRB 000801 gB 11 11 46.1 -09 24 44           ~ 15 0
47 GRB 000623 gB 11 15 41 +10 42.0           ~ 9 0
48 GRB 000616 gB 11 20.2 +26 16           ~ 6 0
49 GRB 010326B gB 11 24.4 -11 10           ~ 12 0
50 GRB 021008 gB 11 42 27.8 +36 50 20           ~ 11 0
51 GRB 990506 gB 11 54 41 -26 45.0           ~ 169 1
52 GRB 010326 gB 11 57 08 +30 50.5           ~ 15 0
53 GRB 991105 gB 12 11 -62.7           ~ 23 0
54 GRB 990704 gB 12 19 27.3 -03 50 22           ~ 50 0
55 GRB 040624 gB 13 00.2 -03 35           ~ 21 0
56 GRB 001105 gB 13 01.9 +35 29           ~ 12 0
57 GRB 000323 gB 13 04 +57.1           ~ 22 0
58 GRB 001018 gB 13 14 10.3 +11 48 32           ~ 15 0
59 GRB 030413 gB 13 14 25 +62 21.0           ~ 8 0
60 GRB 020531 gB 15 14 55.8 -19 24 54           ~ 60 0
61 GRB 970111 gB 15 28 15.0 +19 36 18           ~ 140 0
62 GRB 000615 gB 15 32.6 +73 48           ~ 27 0
63 GRB 020603 gB 15 46 35.530 -22 15 12.95           ~ 13 0
64 GRB 021206 gB 16 00 46.8 -09 42 36           ~ 112 0
65 GRB 040812 gB 16 26 08.5 -44 41 04           ~ 30 0
66 GRB 020604 gB 16 27 32.3 -29 48 21           ~ 9 0
67 GRB 010629 gB 16 32 38.3 -18 43 24           ~ 17 1
68 GRB 040223 gB 16 39 30.2 -41 56 00           ~ 33 0
69 GRB 000508B gB 16 57 -24.1           ~ 19 0
70 GRB 001019 gB 17 11.7 +35 20           ~ 8 0
71 GRB 000416 gB 17 15 -71.6           ~ 9 0
72 GRB 030320 gB 17 51 42 -25 18.7           ~ 19 0
73 GRB 970828 gB 18 08 31.6 +59 18 51           ~ 353 1
74 GRB 000812 gB 18 08 43.7 +45 50 47           ~ 10 0
75 GRB 001109 gB 18 30 07.8 +55 17 56           ~ 39 0
76 GRB 021219 gB 18 50 30.0 +31 54 00           ~ 25 0
77 GRB 010119 gB 18 53 46.17 +11 59 47.0           ~ 20 0
78 GRB 000214 gB 18 54 27.0 -66 27 30           ~ 92 0
79 GRB 030501 gB 19 05 30 +06 18.4           ~ 28 0
80 GRB 010412 gB 19 23.6 +13 37           ~ 17 0
81 GRB 020812 gB 20 38 51 -05 31.2           ~ 26 0
82 GRB 011030 gB 20 43 35.4 +77 17 20           ~ 76 0
83 GRB 020625 gB 20 44 14 +07 10.2           ~ 14 0
84 GRB 040701 G 20 47 46.3 -40 14 13           ~ 45 1
85 GRB 030913 gB 20 58 02 -02 12.5           ~ 22 0
86 GRB 030823 gB 21 30 47 +21 59.8           ~ 18 0
87 GRB 000326A gB 22 11 23.5 -26 08 46           ~ 17 0
88 GRB 001120 gB 22 18.5 +01 06           ~ 8 0
89 GRB 991106 gB 22 24 40.8 +54 22 45           ~ 26 0
90 GRB 040825B gB 22 46.6 -02 24           ~ 14 0
91 GRB 990527 gB 22 50 27 -20 53.4           ~ 13 1
92 GRB 040825A gB 22 59.0 -10 56           ~ 14 0
93 GRB 020819 gB 23 00 12 -43 00.7           ~ 135 1
94 GRB 000519 gB 23 04 38.6 +01 10 17           ~ 26 0
95 GRB 000830 gB 23 34 12.1 +06 20 47           ~ 14 0
96 GRB 040810 gB 23 54.1 -35 04           ~ 13 0
97 GRB 021204 gB ~ ~           ~ 6 0

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