2003A&A...404L...5C

Query : 2003A&A...404L...5C

2003A&A...404L...5C - Astronomy and Astrophysics, volume 404, L5-9 (2003/6-2)

Optical and NIR observations of the afterglow of GRB 020813.

COVINO S., MALESANI D., TAVECCHIO F., ANTONELLI L.A., ARKHAROV A., DI PAOLA A., FUGAZZA D., GHISELLINI G., LARIONOV V., LAZZATI D., MANNUCCI F., MASETTI N., BARRENA R., BENETTI S., CASTRO-TIRADO A.J., DI SEREGO ALIGHIERI S., FIORE F., FRONTERA F., FRUCHTER A., GHINASSI F., GLADDERS M., HALL P.B., ISRAEL G.L., KLOSE S., MAGAZZU A., PALAZZI E., PEDANI M., PIAN E., ROMANO P., STEFANON M. and STELLA L.

Abstract (from CDS):

We present optical and near-infrared (NIR) photometry of the bright afterglow of GRB 020813. Our data span from 3 hours to 4 days after the GRB event. A rather sharp achromatic break is present in the light curve, 14 hours after the trigger. In the framework of jetted fireballs, this break corresponds to a jet half-opening angle of 1.9°±0.2°, the smallest value ever inferred for a GRB. We discuss our results in the framework of currently available models, and find that they have problems in explaining the joint temporal and spectral properties, and in particular the slow decay before the break.

Abstract Copyright: ∼

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

Simbad objects: 6

Full paper

View the references in ADS

Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag V	Sp type	#ref 1850 - 2023	#notes
1	GRB 000131	gB	06 13 31.08	-51 56 41.7	24.7	~	162	1
2	GRB 010222	G	14 52 12.5	+43 01 06		~	344	1
3	GRB 990123	gB	15 25 29	+44 45.0	8.95	~	979	1
4	GRB 000926	gB	17 04 15	+51 46.0		~	353	0
5	GRB 020813A	gB	19 46 41.874	-19 36 04.81		~	295	0
6	GRB 010921	gB	22 55 59.90	+40 55 52.9		~	166	1

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