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GCN Circular 13045

Subject
GRB 120311B: Faulkes Telescope North observations
Date
2012-03-12T08:58:55Z (12 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), F. Virgili (LJMU),
J. Japeli (U. Ljubljana)  on behalf of a larger collaboration report:

"The 2-m Faulkes Telescope North robotically followed up GRB 120311B
(Swift trigger 517489, Marshall et al., GCN Circ 13038) 200 sec after
the GRB trigger time. Within the enhanced XRT error circle (Osborne et
al., GCN Circ. 13042) we do not detect any object in R and i' filters
down to the following limits:

Mid time from       Exposure        Filter       Magnitude
GRB (hr)            (s)
----------------------------------------------------------
0.29                240             R > 20.5
0.39                220             i' > 20.3
----------------------------------------------------------

Values are calibrated against nearby USNOB-1 field stars.
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