TITLE:   GCN CIRCULAR
NUMBER:  18446
SUBJECT: LIGO/Virgo G194575: Mini-MegaTORTORA observations
DATE:    15/10/23 00:50:00 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 #18442 on the possible GW event G194575, we
observed its secondary probability density region with
Mini-MegaTORTORA nine-channel wide-field monitoring system
(located at Special Astrophysical Observatory near Russian 6-m
telescope) starting on 2015-10-22 22:33:24 UT under bad weather
conditions.

The system field of view has been centered on RA, Dec = 16.8, 5.7
covering roughly 900 square degrees simultaneously. Coverage map
of all nine channels is shown at
http://mmt.favor2.info/scheduler/761/lvc

Every channel acquired 10 x 60s exposure images in white light
between 2015-10-22 22:33:24 UT and 2015-10-22 22:42:31 UT,
further observations interrupted due to heavy clouds. The
footprints of acquired images are uploaded to GraceDB.

Quick-look analysis did not reveal any transient brighter than
V~13.5 magnitude in the data.