GCN Circular 15408
Subject
GRB 131030A: Spectroscopy from 10.4m GTC
Date
2013-10-30T22:51:59Z (10 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),
R. Sanchez-Ramirez (IAA-CSIC), J. Gorosabel (IAA-CSIC),
J.P.U. Fynbo (DARK/NBI), N.R. Tanvir (U. Leicester) and
C.A. Alvarez Iglesias (ULL/IAC) report on behalf of a larger collaboration:
We have observed the afterglow of GRB131030A (Troja et al. GCN 15402)
with the 10.4m GTC telescope at Roque de los Muchachos Observatory (Spain)
starting at 21:50 UT (54 min after the burst). We used the R2000B grism that covers
the range from 3950 to 5700 A at a resolution of ~2200.
A single 600s exposure reduced with archive calibrations shows a strong trace
with absorption features of AlIII, ZnII, CrII, NiII, FeII, NiII* and FeII* at a common redshift
of z=1.295, which we identify as the redshift of the GRB. An additional intervening
system is seen at z=1.164, with lines of AlIII, FeII and MnII.