[vsnet-grb-info 18399] GRB 160821B: GTC follow-up observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19847
SUBJECT: GRB 160821B: GTC follow-up observation
DATE:    16/08/23 04:45:23 GMT
FROM:    Soomin Jeong at IAA-CSIC  <sjeong at iaa.es>

S. Jeong (SKKU/IAA-CSIC), I. H. Park (SKKU), Y. Hu (IAA-CSIC), R. Scarpa
(GTC) and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger
collaboration report:

We observed the field of the short GRB 160821B detected by Swift (Siegel et
al. GCNC
19833) and Fermi (Stanbro et al. GCNC 19843) using the 10.4m Gran
Telescopio Canarias (GTC)
equipped with OSIRIS. Observations started at 00:16:17.480 UT on Aug 22
(i.e.,
1.78 hr after the burst), in the riz-band filters.

We also detect the point-like source proposed by Xu et al. (GCNC 19834) as
a potential
afterglow candidate) within the XRT error circle reported by Siegel et al.
(GCNC 19833),
for which we measure a preliminary magnitude (pending final calibration) of
R = 22.40+/-0.06
at 1.83 hr after the burst.

Lacking variability, unless there is an initial plateau phase lasting
several hour in the
afterglow brightness, this would be consistent with a host galaxy detection.
Further GTC observations are planned.

We thanks D. Xu and D. Malesani for providing secondary reference stars in
the field.


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Dr. Soomin Jeong

Institute for Science and Technology in Space (ISTS)
Research Fellow
Engineering building #27508
Natural Science Campus
Sungkyunkwan University
440-746, Suwon, Korea
soominjeong at gmail.com

Stellar Physics Dept.
Instituto de Astrofísica de Andalucía (IAA-CSIC)
Glorieta de la Astronomía s/n
18008 Granada, Spain
Tel.: +34-958-230-310 (ext 610)
Fax : +34-958-814-530
E-mail: sjeong at iaa.es
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