Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.6303h&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #63.03; Bulletin of the American Astronomical Society, Vol. 32, p.1507
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
We present deep HST/STIS and ground-based images of the host galaxy of the gamma-ray burst GRB 980703. We find that the host galaxy is slightly sub-luminous with LB ≈ 0.6 L*B in the rest frame. The host has a mean ellipticity of /lineɛ = 0.16 +/- 0.01 and there is no evidence for substructure. The surface brightness profile is best fit by a r1/n law with n = 1.2 +/- 0.1, but we can not rule out an exponential disc profile. The galaxy has V-R = 0.43 +/- 0.13 and there is evidence that the centre of the galaxy is bluer than the outer regions are. The late-time R- and I-band light curves show weak evidence for an excess flux above what is predicted by either a single power law or a broken power law decline. The excess flux is consistent with GRB 980703 being associated with a Type Ic supernova similar to GRB 980425/SN1998bw. However, we are not able to rule out dust echos as the source of this excess flux. This work was supported by the Danish Natural Science Research Council (SNF) through the Danish Centre for Astrophysics with the HST.
Andersen Michael I.
Dar Arnon
Fynbo Johan U.
Gorosabel Javier
Hjorth Jens
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