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The Host Galaxy and Optical Light Curve of the Gamma-Ray Burst GRB 980703 | | S. Holland
; J. P. U. Fynbo
; J. Hjorth
; J. Gorosabel
; H. Pedersen
; M. I. Andersen
; A. Dar
; B. Thomsen
; P. Moller
; G. Bjornsson
; A. O. Jaunsen
; P. Natarajan
; N. Tanvir ( Aarhus
; Notre Dame
; ESO
; Copenhagen
; DSRI
; Oulu
; Technion
; Iceland
; Yale
; | | Date: |
3 Mar 2001 | | Journal: | Astron.Astrophys. 371 (2001) 52 | | Subject: | astro-ph | | Affiliation: | 1 and 2), J. P. U. Fynbo , J. Hjorth , J. Gorosabel , H. Pedersen , M. I. Andersen , A. Dar , B. Thomsen , P. Moller , G. Bjornsson , A. O. Jaunsen , P. Natarajan , N. Tanvir (10) ( Aarhus, Notre Dame, ESO, Copenhagen, DSRI, Oulu, Technion, Ice | | Abstract: | We present deep HST/STIS and ground-based photometry of the host galaxy of the gamma-ray burst GRB 980703 taken 17, 551, 710, and 716 days after the burst. We find that the host is a blue, slightly over-luminous galaxy with V_gal = 23.00 +/- 0.10, (V-R)_gal = 0.43 +/- 0.13, and a centre that is approximately 0.2 mag bluer than the outer regions of the galaxy. The galaxy has a star-formation rate of 8-13 M_sun/yr, assuming no extinction in the host. We find that the galaxy is best fit by a Sersic R^(1/n) profile with n ~= 1.0 and a half-light radius of 0.13 arcsec (= 0.72/h_100 proper kpc). This corresponds to an exponential disk with a scale radius of 0.22 arcsec (= 1.21/h_100 proper kpc). Subtracting a fit with elliptical isophotes leaves large residuals, which suggests that the host galaxy has a somewhat irregular morphology, but we are unable to connect the location of GRB 980703 with any special features in the host. The host galaxy appears to be a typical example of a compact star forming galaxy similar to those found in the Hubble Deep Field North. The R-band light curve of the optical afterglow associated with this gamma-ray burst is consistent with a single power-law decay having a slope of alpha = -1.37 +/- 0.14. Due to the bright underlying host galaxy the late time properties of the light-curve are very poorly constrained. The decay of the optical light curve is consistent with a contribution from an underlying Type Ic supernova like SN1998bw, or a dust echo, but such contributions cannot be securely established. | | Source: | arXiv, astro-ph/0103058 | | Services: | Forum | Review | PDF | Favorites | |
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