TITLE:   GCN CIRCULAR
NUMBER:  13200
SUBJECT: GRB 120402A: optical upper limit
DATE:    12/04/03 18:48:49 GMT
FROM:    Alina Volnova at SAI MSU  <alinusss@gmail.com>

A. Volnova (SAI MSU), E. Litvinenko (UBAI), I. Molotov (KIAM), A.
Pozanenko (IKI) on behalf of �larger GRB follow up collaboration
report:

We observed the field of the possible GRB 120402A (Swift
trigger=519207; Barthelmy et al., �GCN 13190) with ORI-40 telescope of
Kitab ISON observatory on Apr. 02 starting �(UT) 22:55:14, i.e. ~6 min
after burst trigger. We obtained several �unfiltered images with
exposure of 60 seconds. Within BAT error circle of 3 arcmin, radius
(Barthelmy et al., �GCN 13190) we do not detect apparently new source
in comparison with DSS2-red. �The �photometry is based on �USNO-B1.0
reference star 1092-0548647 �(20:57:27.42 +19:17:47.2) assuming R =
14.41.

Tstart UT, � T0+, � � � �Filter, Exposure, OT, �UL (3 sigma)
� � � � � � � �(mid, d) � � � � � � � (s)

22:55:14 � �0.01449 � �none � 2800 � � �n/d � � 19.8