The discovery of SN2003lw associated to GRB031203: its properties and those of the Host Galaxy

Details The discovery of SN2003lw associated to GRB031203: its properties and those of the Host Galaxy The discovery of SN2003lw associated to GRB031203: its properties and those of the Host Galaxy

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.4201t&link_type=abstract

American Astronomical Society, HEAD meeting #8, #42.01; Bulletin of the American Astronomical Society, Vol. 36, p.1207

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Optical and near-infrared observations of the gamma-ray burst GRB031203 and its host galaxy, at z = 0.1055, have been performed with the ESO telescopes at La Silla and Paranal over a timescales of few months. A very faint afterglow is detected superimposed to the host galaxy in our first infrared JHK observations, carried out ˜ 9 hours after the burst. Subsequently, a rebrightening is detected in all bands, peaking in the R band about 18 rest-frame days after the burst. The rebrightening closely resembles the light curve of a supernova like SN1998bw, assuming that the GRB and the SN went off almost simultaneously, but with a somewhat slower evolution. Spectra taken close to the maximum of the rebrightening led to the discovery of the supernova SN2003lw. The determination of the absolute magnitude of this SN is difficult owing to the large and uncertain extinction, but likely this event was brighter than SN1998bw by 0.5 mag in the VRI bands, reaching an absolute magnitude MV=-19.75 ± -0.15.
The optical spectrum of the host galaxy is dominated by strong emission lines, typical of HII and starburst galaxies. The inferred star formation rate is quite high, several solar masses per year. The size of the HII region and the amount of ionising flux and its origin will also be discussed.

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