[vsnet-grb-info 7784] GRB 090408: optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9330
SUBJECT: GRB 090408: optical upper limit
DATE:    09/05/09 20:55:42 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

D. Shakhovskoy, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of 
larger GRB follow-up collaboration:

We observed  the Swift GRB 090408  (Swift trigger=348720; Stroh  et al., GCN 
9110) in R-filter   on Apr. 8  with AZT-11 telescope of CrAO.  We do not 
detect any new object within BAT erorr box (Stroh  et al., GCN 9110)  in  a 
stacked image in R at ~ 3.7 hrs after burst onset.  An upper limit 
photometry of combined images  based on USNO B1.0 1275-0286482 
RA(J2000)=15:26:27.78 Dec(J2000)= +37:33:46.2 R =17.55 is  following:

T0+     Filter, Exposure, mag.,     err.
(d)             (s)

0.1561  R   20x180     > 20.4 (3sigma)