GCN Circular 21875
Subject
LIGO/Virgo G299232: Khureltogot observations
Date
2017-09-12T19:49:39Z (8 years ago)
From
Alexei Pozanenko at IKI,Moscow <grbgw.iki@gmail.com>
A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), S. Schmalz
(KIAM), N. Tungalag (Research Center of Astronomy and Geophysics MAS),
I. Molotov (KIAM) report on behalf of IKI-GW follow-up collaboration:
We observed the field of LIGO/Virgo trigger G299232 (LVC GCN 21693)
and the error circle of IceCube candidate X1, hereafter ICX1 (GCNs
21694, 21698) with wide FOV VT-78a telescope of Khureltogot observatory
starting on 2017-08-25 (UT) 15:24:13. We obtained several unfiltered
images with the two time series, each centered to the position of
localization reported in GCN 21694, and GCN 21698, respectively.
Preliminary results of our analysis of the fields are following.
Date UT start t-T0 Exp. UL FOV Center Coverage
(Since G299232 (s) (5 sigma) RA, Dec. %
mid, days) degrees
2017-08-25 15:24:13 0.11289 60*60 19.3 27.1, 45.1 85.1
2017-08-25 16:32:52 0.16054 60*60 19.4 28.2, 44.8 78.3
Photometry is based on USNO-B1.0 stars (R2 magnitudes).
Total coverage of the error region of ICX1 (GCN 21698) is 85.7%. The map
of the coverage can be found at
http://grb.rssi.ru/GW170825_G299232/LVC_IC_Khureltogot_v3.png
We found no new or unknown objects in the combined images up to the
limits listed above.
We investigate all sources above S/N > 10 (~17m) and found no
significant variability of the sources between the two epochs. We found
no significantly more brighter sources which could be galaxies
(including galaxy 2MASX J01571097+4715588 listed as Nearby Galaxies in
the Localization Volume (GCN 21707)) than their R-magnitudes presented
in the USNO-B1.0 catalog.