2005MNRAS.357..722L

Query : 2005MNRAS.357..722L

2005MNRAS.357..722L - Mon. Not. R. Astron. Soc., 357, 722-731 (2005/February-3)

Precursor activity in bright, long BATSE gamma-ray bursts.

LAZZATI D.

Abstract (from CDS):

We study a sample of bright, long Burst and Transient Source Experiment (BATSE) gamma-ray burst (GRB) light curves in the 200 s before the detection of the GRB prompt emission. We find that in a sizable fraction of cases (∼20 per cent) there is evidence of emission above the background coming from the same direction as the GRB. This emission is characterized by a softer spectrum with respect to the main spectrum and contains a small fraction (0.1-1 per cent) of the total event counts. The precursors have typical delays of several tens of seconds extending (in few cases) up to 200 s (the limit of the investigated period). Their spectra are typically non-thermal power-law spectra, aside from a few cases. Such long delays and the non-thermal origin of their spectra are hard to reconcile with any model for the progenitor.

Abstract Copyright: 2005 RAS

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

Simbad objects: 28

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Number of rows : 28
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 3B 930425B gB 01 12.0 -35 11           ~ 20 0
2 2B 921230 gB 01 18.1 +17 13           ~ 20 0
3 4B 941014 gB 02 06.6 +07 26     10.5     ~ 19 0
4 4B 960607 gB 03 13.7 +75 06           ~ 17 0
5 1B 910814C gB 03 52.0 +45 13           ~ 30 0
6 4B 950401B gB 05 44.2 +43 45           ~ 15 0
7 GRB 970816 gB 06 00 +41.0           ~ 15 0
8 GRB 990129 gB 06 38 -12.0           ~ 9 0
9 3B 930603 gB 08 04.6 +00 25           ~ 11 0
10 GRB 900126 gB 08 46.5 -38 11           ~ 16 0
11 3B 940206 gB 10 04.5 -62 37           ~ 29 0
12 GRB 990316 gB 10 11 -05.5           ~ 27 0
13 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1261 1
14 4B 950425 gB 10 52.6 -35 15           ~ 26 0
15 1B 911202 gB 11 30.0 -22 50           ~ 40 0
16 GRB 011121 gB 11 34 26.67 -76 01 41.6       23.0   ~ 286 1
17 1B 910627 gB 13 12.0 -02 29           ~ 54 0
18 3B 940810 gB 14 08.0 -17 28           ~ 18 0
19 GRB 990728 gB 14 10 -58.4           ~ 12 0
20 4B 950818 gB 18 34.6 +33 52           ~ 33 0
21 GRB 980124 gB 18 40 +80.1           ~ 11 0
22 2B 920525 gB 19 58.5 -42 03           ~ 53 0
23 4B 941017 gB 20 06.2 +09 49           ~ 93 0
24 4B 950104 gB 20 13.0 -15 38           ~ 18 0
25 2B 930309 gB 21 41.6 +51 44           ~ 33 0
26 2B 921123 gB 22 17.0 -53 15           ~ 42 0
27 4B 950208 gB 22 27.8 +54 11           ~ 21 0
28 GRB 970315 gB 23 48 +62.4           ~ 22 0

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