[vsnet-grb-info 13423] GRB 130604A: ISON-NM optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14756
SUBJECT: GRB 130604A: ISON-NM optical upper limit
DATE:    13/06/04 09:48:21 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

L. Elenin (KIAM),  V. Savanevych (KNURE),  A. Bryukhovetskiy (NSFCTC),  I. 
Molotov (KIAM), A. Pozanenko (IKI) report on behalf of  larger GRB 
follow-up collaboration:

We observed of  the field of  the Swift GRB 130604A (Melandri et al., GCN 
14752)  with 0.45-m telescope of ISON-NM observatory on June. 04 (UT) 
06:56:11, i.e. 105 s after burst trigger. Series of 30 s and 60 s exposures 
were obtained in clear filter. In the combined image of the first 3 images 
we do not detect afterglow candidate (Perley, GCB 14753).  Preliminary 
photometry  is based  on the USNO-B1.0 (R2)  nearby  stars:

UT start,      T0+        Exposure,  OT,              UL (3 sigma)
                   days      s

06:56:11       0.0019  3x30           n/d              19.7