1999ApJ...523L.121H

Query : 1999ApJ...523L.121H

1999ApJ...523L.121H - Astrophys. J., 523, L121-L124 (1999/October-1)

Optical and radio observations of the afterglow from GRB 990510: evidence for a jet.

HARRISON F.A., BLOOM J.S., FRAIL D.A., SARI R., KULKARNI S.R., DJORGOVSKI S.G., AXELROD T., MOULD J., SCHMIDT B.P., WIERINGA M.H., WARK R.M., SUBRAHMANYAN R., McCONNELL D., McCARTHY P.J., SCHAEFER B.E., McMAHON R.G., MARKZE R.O., FIRTH E., SOFFITTA P. and AMATI L.

Abstract (from CDS):

We present multicolor optical and two-frequency radio observations of the bright BeppoSAX event GRB 990510. Neither the well-sampled optical decay nor the radio observations are consistent with simple spherical afterglow models. The achromatic steepening in the optical band and the early decay of the radio afterglow, which both occur at t∼1 day, are evidence for hydrodynamical evolution of the source and can be most easily interpreted by models in which the gamma-ray burst ejecta are collimated in a jet. Employing a simple jet model to explain the observations, we derive a jet opening angle of θ0=0.08(n/1cm–3)1/8, reducing the isotropic gamma-ray energy release of 2.9x1053 ergs by a factor of ∼300.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Miscellaneous - Gamma Rays: Bursts - Radio Continuum: General - Shock Waves

Simbad objects: 6

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Number of rows : 6
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 970228 gB 05 01 46.7 +11 46 53           ~ 650 1
2 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 883 1
3 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 445 1
4 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 499 1
5 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 1012 1
6 GRB 980703 gB 23 59 06.7 +08 35 07           ~ 453 1

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