[vsnet-grb-info 3917] GRB060904b: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5741
SUBJECT: GRB060904b: optical observations
DATE:    06/10/20 20:42:14 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

I. Asfandyarov,  M. Ibrahimov (MAO),  A. Pozanenko (IKI), on behalf of
larger GRB follow up collaboration report:

We observed  the  error box of GRB060904b (Grupe et al., GCN 5505)  with 1.5
m telescope of Maidanak Astronomical Observatory (MAO)  on September 4 and
5. A set of R images were taken under good weaher conditions.  The afterglow
(Rykoff  et al., GCN 5504; Grupe et al., GCN 5505) is clearly detected in
combined images of each epochs. A photometry of the afterglow based on USNO
A2.0 is following:

Mid time (UT), Exposure (s), R_ mag.,     Seeing

Sep. 04.999    4x360        21.63 +/-0.18  1.4"
Sep. 05.993    4x300        22.40 +/-0.30  1.1"

The message may be cited