TITLE:   GCN CIRCULAR
NUMBER:  12411
SUBJECT: GRB 110905A /  MAXI J1836-194: optical monitoring
DATE:    11/10/01 16:31:58 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Pozanenko (IKI), A. Volnova (SAI MSU), M. Andreev  (Terskol Branch of 
Institute of Astronomy), V. Rumyantsev (CrAO),  D. Shakhovskoy  (CrAO),  V. 
Biryukov (SAI MSU & CrAO),  A. Sergeev (Terskol Branch of Institute of 
Astronomy) on behalf of larger GRB follow up collaboration report:

We started a monitoring campaign of  MAXI J1836-194 (Negoro et al., ATel 
3611) after Swift triggers #502415 (=GRB110905A, Pagani et al., GCN 12327). 
Till now observations were obtained with Zeiss-600 (Mt. Terskol), AZT-11 
(CrAO), Zeiss-600 and ZTE (SAI MSU) in the R and B filters. We clearly 
detect significant optical variability of the source of MAXI J1836-194, and 
at least one peak of our light curve (Sep. 19.80) coincides with a peak of 
radio light curve of MAXIJ1836-194 at 4.8 GHz (Trushkin et al., ATel. 3656).

The light curve (Sep. 5 - Sep. 26) can be found at
http://grb.rssi.ru/GRB110905A=MAXI_J1836-194/MAXIJ1836-194_lc_opt.png

Observations will be continued.