[vsnet-grb-info 16534] GRB 150512A: CrAO optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri May 15 04:31:11 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 17815
SUBJECT: GRB 150512A: CrAO optical observations
DATE: 15/05/14 19:30:18 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
E. Mazaeva (IKI), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We observed the two OT candidates (Singer et al., GCN 17809) of the
Fermi GRB 150512A (Zhang et al., GCN 17811) with ZTSh telescope of CrAO
observatory starting on May. 13 (UT) 21:04:53. Both candidats are
clearly visible in our images. Photometry of the candidates is following
iPTF15asn:
Date UT start t-T0 Filter Exp. Source Err.
(mid, days) (s)
2015-05-13 21:04:53 1.45795 R 16*120 19.20 0.03
iPTF15asm:
Date UT start t-T0 Filter Exp. Source Err.
(mid, days) (s)
2015-05-13 21:46:49 1.48417 R 12*120 19.40 0.02
Photometry of iPTF15asm might be biased by nearby galaxy SDSS
J134044.09+631954.4. However both sources do not fade in comparison with
early observations (Singer et al., GCN 17809) and most probably cannot
be considered as afterglow.
Photometry is in Vega, and based on following SDSS stars
SDSS9_id R_Lupton
J135741.63+650759.8 16.82
J135738.44+650852.4 18.03
J135752.58+650922.2 18.14
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