[vsnet-grb-info 16634] GRB150607A: AAO and CrAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17915
SUBJECT: GRB150607A: AAO and CrAO optical observations
DATE:    15/06/08 17:49:29 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), R. Inasaridze (AAO), S. Nazarov (CrAO), Sh. 
Makandarashvili (AAO), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of GRB 150607A (Swift trigger 642620, D'Elia et 
al., GCN 17904) with the AS-32 (0.7m) telescope of Abastumani 
Observatory (AAO) starting on June, 07 17:54:22, and with AZT-8 
telescope of CrAO starting on June, 07 19:43:21.  The afterglow of GRB 
150607A (Kruehler et al., GCN 17908; Hagen et al., GCN 17909) is clearly 
detected in early observation in AAO. Preliminary photometry is following.

telescope  UT start   t-T0     Filter   Exp.     OT    Err.
                       (mid, days)       (s)

AS-32      17:54:22   0.45669  None     44*120   21.20 0.1
AZT-8      19:43:21   0.49864  R         6*180  >19.4 (3sigma)

Photometry is based on nearby USNO-B1.0 stars.