[vsnet-grb-info 18566] GRB 161007A: GTC observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Oct 8 13:33:25 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 20014
SUBJECT: GRB 161007A: GTC observations
DATE: 16/10/08 04:32:45 GMT
FROM: Antonio de Ugarte Postigo at IAA-CSIC <deugarte at iaa.es>
A. de Ugarte Postigo (IAA-CSIC), D. A. Kann (TLS Tautenburg),
L. Izzo, C. C. Thoene (both IAA-CSIC), N. Castro-Rodriguez, and
G. Gomez Velarde (GRANTECAN/IAC/Universidad de La Laguna)
report:
We observed the field of GRB 161007A (Swift 716127, D'Elia et al.,
GCN #20008), with the 10.4m GTC on La Palma, Canary Islands,
Spain. We obtained four 30 sec images in the Sloan i' band at an
airmass of 1.8. The midtime of our observations was 0.2228 days
after the GRB trigger.
At the UVOT-enhanced Swift XRT position (Goad et al., GCN #20013),
we detect a source at the edge of the error circle, at:
RA (J2000) = 06:53:38.10
Dec. (J2000) = +23:18:24.6
For this source, we measure:
i’ (Vega) = 22.23 +/- 0.15
The photometric calibration was done by comparing to USNOB-1.0
stars in the I-band filter, therefore this is only a preliminary value.
No statement can be made about fading. We note that the X-ray
spectrum of this GRB's afterglows shows evidence for excess
absorption, therefore this may be a dark GRB, with this source being
its host galaxy. The source looks extended in our image, which has a
seeing of 1.2".
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