[vsnet-grb-info 12348] GRB 120907A: Spectroscopy from OSIRIS/GTC
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Sep 8 01:35:27 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13723
SUBJECT: GRB 120907A: Spectroscopy from OSIRIS/GTC
DATE: 12/09/07 16:35:20 GMT
FROM: Antonio de Ugarte Postigo at IAA-CSIC <deugarte at iaa.es>
R. Sanchez-Ramirez, J. Gorosabel (IAA-CSIC), A. de Ugarte Postigo
(IAA-CSIC, DARK/NBI) and J.M. Gonzalez Perez (GTC) report
on behalf of a larger collaboration:
We have obtained spectroscopy of the afterglow of GRB 120907A
(Racusin et al. GCN 13716) with OSIRIS/ GTC (La Palma, Spain) on
Sep 7.20647-7.23893 UT (4.55-5.33 hours post GRB). The observation
consisted of 3x900s exposures using the R1000R grating, covering the
range from 5100 to 10000 A with a resolution of ~1100.
In the combined spectrum we detect several absorption features
corresponding to FeII, MgII, MgI and CaII at a common redshift of z=0.970,
which we identify as the redshift of the GRB.
We acknowledge the excellent support of the GTC staff.
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