TITLE:   GCN CIRCULAR
NUMBER:  20492
SUBJECT: LIGO/Virgo G270580: Mini-MegaTORTORA follow-up observations
DATE:    17/01/21 01:33:33 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)

We observed the sky area corresponding to 49% probability of initial LIB
skymap for the advanced LIGO trigger G270580 with Mini-MegaTORTORA
nine-channel wide-field monitoring system (located at Special Astrophysical
Observatory near Russian 6-m telescope) between 2017-01-20 15:05:45 UT (2.6
hours since trigger) and 2017-01-20 19:31:28 UT (7.0 hours since trigger)
under varying weather condition.
Observations consisted of several pointings with 10 x 60 s unfiltered
exposures each in every channel, covering roughly 900 square degrees
simultaneously. Image of the total sky coverage is available at
http://mmt.favor2.info/scheduler/1436/lvc
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.