[vsnet-grb-info 9602] GRB 100805A: SAO RAS optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11071
SUBJECT: GRB 100805A: SAO RAS optical observations
DATE:    10/08/07 13:47:19 GMT
FROM:    Vladimir Sokolov at SAO RAS  <sokolov at sao.ru>

A. S. Moskvitin, T. A. Fatkhullin, V. V. Sokolov, T. N. Sokolova &
V. N. Komarova (SAO RAS, Niznijh Arkhyz, Russia), report:

We observed the field of the GRB100805A (Hoversten E. A. et al., GCN 11047)
with the Zeiss-1000 telescope of SAO RAS, Russia. The observations were
carried out in the BVRc bands on  Aug. 5.843-6.033 UT. Assuming the
magnitudes of the reference USNO-B1.0 star (L.P. Xin et al., GCN 11065) as
B = 18.94 and R = 17.41 we estimated the brightness of the GRB100805A optical
transient as:

B = 22.85 +/- 0.11
R = 21.43 +/- 0.10

Errors are formal and do not include ones of USNO-B1.0 to Johnson-Cousins
photometric system transformation.

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