[vsnet-grb-info 11077] GRB 111022B: 10.4m GTC z -band observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Oct 25 19:15:44 JST 2011
TITLE: GCN CIRCULAR
NUMBER: 12494
SUBJECT: GRB 111022B: 10.4m GTC z'-band observations
DATE: 11/10/25 10:15:40 GMT
FROM: Javier Gorosabel at IAA-CSIC <jgu at iaa.es>
J. Gorosabel (IAA-CSIC), A. Cabrera Lavers (GTC), R. Sanchez-Ramirez
(IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), A.J. Levan (U.
Warwick), C.C. Thoene (IAA-CSIC), N.R. Tanvir (U. Leicester), A.J.
Castro-Tirado (IAA-CSIC), P. Kubanek (IAA-CSIC, U. Valencia), report
on behalf of a larger collaboration:
We acquired z'-band images of the GRB 111022B field (Holland et al.,
GCNC 12472; Beardmore et al., GCNC 12478) with the 10.4m GTC(+OSIRIS)
telescope. The observations were carried out on Oct 24.1105--24.1453
UT (33.4--34.3 hours post GRB) with a total exposure time of
31x60s=1860s and a seeing of 1.0-1.5". A faint object is detected
coincident with the near-IR and optical candidate (Levan et al. GCNC
12481; Moskvitin et al. GCNC 12491). This source has a very
preliminary AB magnitude of z'~25.5. In the XRT error circle
(Beardmore et al., GCNC 12478) we note the presence of an additional
object with a similar magnitude located 1.5" eastwards from the
afterglow candidate.
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