[vsnet-grb-info 3277] GRB060418: optical observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5112
SUBJECT: GRB060418: optical observations
DATE:    06/05/11 11:04:51 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

R. Karimov,  B. Hafizov (MAO),  A. Pozanenko (IKI), M. Ibrahimov (MAO) on
behalf of larger GRB follow up collaboration report:

We observed the afterglow of GRB060418 (Falcone et al. GCN 4966) with 1.5m
telescope of Maidanak Astronomical Observatory (MAO) in BRI-bands on April
18  between  (UT) 19:54 and 22:37 (Hafizov et al. GCN 4990).  A photometry
of the afterglow is following:

Mid_Time(UT), Filter, Exposure, Magnitude

18.857   B   7x180 s     22.38  +/- 0.10
18.853   R   7x120 s     21.14  +/- 0.05
18.855   I   9x120 s     20.66  +/- 0.04
18.934   I   9x120 s     20.35  +/- 0.04

The photometry is  based on field stars calibration by Henden (GCN 4979) and
not corrected for Galaxy extinction. We note our I-observations indicate a
possible  re-brighntening  of the afterglow.

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