[vsnet-grb-info 11083] GRB 111029A: optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12500
SUBJECT: GRB 111029A: optical upper limit  
DATE:    11/10/29 12:04:50 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

L. Elenin (ISON),  A. Pozanenko (IKI), I. Molotov (KIAM) report on behalf of 
larger GRB  follow-up collaboration:

We observed the field of  GRB 111029A (Swift trigger 506519; Troja et al., 
GCN 12498) with 0.45-m telescope Ïf ISON-NM observatory  starting in 
automatic response mode on  Oct. 29 (UT) 09:47:47, i.e. 187 s after burst 
trigger.  We took 31 unfiltered images.  We do not detect any source within 
XRT error circle.   The photometry of a single and co-added frames is based 
on the USNO-B1.0  nearby stars (R magnitudes):

T_start,   T0+,       Exposure, OT,  Upper Limit (3sigma)
(UT)        (mid, s)   (s)

09:47:47    216.5        60       n/d    18.3
09:47:47   1101.5  15x60       n/d    19.5
09:47:47   1385.0  31x60       n/d    20.3