GCN Circular 13512
Subject
GRB 120724A: Gemini-N tentative redshift
Event
Date
2012-07-24T09:51:40Z (13 years ago)
From
Antonino Cucchiara at UCSC/UCO Lick <acucchia@ucolick.org>
A. Cucchiara (UCSC/UCO Lick), N.R. Tanvir (U. Leicester),
D. Perley (Caltech), and A. J. Levan (U. Warwick) report
on behalf of a larger collaboration:
We observed the afterglow of GRB 120724A (Guidorzi et al.
GCN 13511; D'Avanzo et al. GCN 13510) using the GMOS-N
spectrograph on the Gemini-North telescope under very good
seeing conditions (0.5").
Observations began at 2012-7-24 08:31 UT, about 2 hr post-burst.
Two spectra of 900s each were acquired, covering the
6000-10000 Angstrom wavelength range.
A preliminary analysis of some of the absorption features
identified suggests that the GRB redshift is z = 1.48,
based on identification of MgII2796,2803 doublet,
MnII2606, FeII2600, and MnII2594.
We thank the Gemini staff, in particular J. Holt and
J. Kemp, for making these observations possible.