TITLE:   GCN CIRCULAR
NUMBER:  20373
SUBJECT: LIGO/Virgo G268556: Mini-MegaTORTORA follow-up observations
DATE:    17/01/05 19:24:22 GMT
FROM:    Sergey Karpov at Special Astrophysical Obs  <karpov.sv@gmail.com>

S.Karpov, G.Beskin (SAO RAS and Kazan Federal University,
Russia), S.Bondar, E.Ivanov, E.Katkova, A.Perkov (OJS RPC PSI,
Russia), A.Biryukov (SAI MSU and Kazan Federal University,
Russia), V.Sasyuk (Kazan Federal University, Russia)

Following GCN #20364 on the possible GW event G258556, we observed part of
its sky localization region with Mini-MegaTORTORA nine-channel wide-field
monitoring system (located at Special Astrophysical Observatory near
Russian 6-m telescope) starting on 2017-01-04 18:32:48 UT (8.3 hours since
trigger) under moderate weather conditions.

The system field of view has been centered on RA, Dec = 136, 54 covering
roughly 900 square degrees simultaneously. This covers about 30% of the
probability in the BAYESTAR map.
Coverage map of all nine channels is shown at
http://mmt.favor2.info/scheduler/1416/lvc

Every channel acquired 10 x 60s exposure images in white light between
2017-01-04 18:32:48 UT and 2017-01-04 18:41:50 UT. The footprints of
acquired images are uploaded to GraceDB.

Quick-look analysis did not reveal any transient brighter than V~14.5
magnitude in the data.