2008MNRAS.386L..87N

Query : 2008MNRAS.386L..87N

2008MNRAS.386L..87N - Mon. Not. R. Astron. Soc., 386, L87-L91 (2008/May-1)

Optical afterglow luminosities in the Swift epoch: confirming clustering and bimodality.

NARDINI M., GHISELLINI G. and GHIRLANDA G.

Abstract (from CDS):

We show that gamma-ray bursts (GRBs) of known redshift and rest-frame optical extinction detected by the Swift satellite fully confirm earlier results concerning the distribution of the optical afterglow luminosity at 12h after trigger (rest-frame time). This distribution is bimodal and relatively narrow, especially for the high-luminosity branch. This is intriguing, given that Swift GRBs have, on average, a redshift larger than pre-Swift ones, and is unexpected in the common scenario explaining the GRB afterglow. We investigate if the observed distribution can be the result of selection effects affecting a unimodal parent luminosity distribution, and find that either the distribution is intrinsically bimodal, or most (60 per cent) of the bursts are absorbed by a substantial amount of grey dust. In both cases we suggest that most dark bursts should belong to the underluminous optical family.

Abstract Copyright: ©2008 The Authors. Journal compilation © 2008 RAS

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

CDS comments: In Appendix A: GRB 050821 is a misprint for GRB 050824.

Simbad objects: 50

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Number of rows : 50
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 070110 gB 00 03 39.270 -52 58 27.00 21.8 21.9 21.2     ~ 220 0
2 GRB 050824 gB 00 48 56.100 +22 36 32.00 19.66 21.03 20.46 23.70   ~ 184 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 GRB 041006 gB 00 54 50.17 +01 14 07.0           ~ 202 2
5 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 496 0
6 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 179 0
7 GRB 040924 gB 02 06 22.52 +16 08 48.8           ~ 169 1
8 GRB 071112C gB 02 36 50.89 +28 22 16.9           ~ 164 0
9 GRB 050603 gB 02 39 56.839 -25 10 54.92     18.48     ~ 174 0
10 GRB 061007 gB 03 05 19.510 -50 30 02.50 14.28 14.40 12.95     ~ 315 1
11 GRB 050318 gB 03 18 51.000 -46 23 43.61 18.10 18.68 17.58     ~ 189 0
12 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 275 0
13 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 208 0
14 GRB 060124 gB 05 08 25.900 +69 44 26.98   18.91 17.35     ~ 280 0
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
16 GRB 061126 gB 05 46 24.460 +64 12 38.49 18.62 18.79 19.20     ~ 182 1
17 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 303 0
18 GRB 070411 gB 07 09 19.930 +01 03 52.60     17.94     ~ 138 0
19 GRB 070125 gB 07 51 17.80 +31 09 04.8           ~ 188 0
20 GRB 071020 gB 07 58 39.65 +32 51 38.8           ~ 158 0
21 GRB 070612 gB 08 05.4 +37 15           ~ 13 0
22 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 350 0
23 GRB 071010B gB 10 02 09.20 +45 43 52.2           ~ 173 0
24 GRB 050319 gB 10 16 47.900 +43 32 53.80   18.02 17.01     ~ 274 0
25 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1261 1
26 GRB 050408 gB 12 02 17.320 +10 51 10.00           ~ 153 0
27 GRB 050416 gB 12 33 54.600 +21 03 26.69     19.12     ~ 300 1
28 GRB 070810 gB 12 39.8 +10 45           ~ 16 0
29 GRB 060512 gB 13 03 05.810 +41 11 27.21 19.12 19.63 17.20     ~ 142 0
30 GRB 050502 gB 13 29 46.31 +42 40 27.2           ~ 32 0
31 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 330 0
32 GRB 050801 gB 13 36 35.000 -21 55 41.00 15.03 15.82 15.46     ~ 164 0
33 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 327 0
34 GRB 050802 gB 14 37 05.820 +27 47 12.62 16.85 17.38 16.97     ~ 186 0
35 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 209 0
36 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 288 0
37 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 389 0
38 GRB 060502A gB 16 03 42.480 +66 36 02.49     18.65     ~ 143 0
39 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 348 0
40 SN 2005nc SN* 18 32 32.560 +26 20 22.34           SNIc: 400 1
41 GRB 071010A gB 19 12 14.42 -32 24 06.2           ~ 138 0
42 GRB 071003 gB 20 07 24.50 +10 56 48.8           ~ 181 0
43 GRB 050315 gB 20 25 54.100 -42 36 02.19           ~ 225 0
44 GRB 070419B gB 21 02 49.820 -31 15 49.30   20.35       ~ 86 0
45 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 301 0
46 GRB 060614 G 21 23 32.140 -53 01 36.10           ~ 714 0
47 GRB 051109 gB 22 01 11.0 +40 50 15           ~ 34 0
48 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 409 0
49 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 223 0
50 GRB 071125 gB ~ ~           ~ 8 0

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