GCN Circular 21618
Subject
LIGO/Virgo G298048: optical observations of CHILESCOPE observatory
Date
2017-08-20T14:24:47Z (8 years ago)
From
Alexei Pozanenko at IKI,Moscow <grbgw.iki@gmail.com>
A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), P. Minaev
(IKI), M. Krugov (AFIF) report on behalf of IKI-GW follow-up collaboration:
We observed the field of LIGO/Virgo trigger G298048 (LVC GCNs 21509,
21513) and the error circle of GMB/Fermi short burst GRB 170817A
(Connaughton et al., GCN 21506) with RC-1000 and ASA-500 telescopes of
CHILESCOPE observatory located at W 70d 34m S20d 27m. The observations
started on Aug 17 (UT) 23:17:16 in clear filter. The last image was
recorded on 2017-08-18T00:59:48.
We cover central part of G298048 localization with typical limiting
magnitude of 20m at 60 s exposure in each image. The covering map can be
found in
http://grb.rssi.ru/GRB170817A/bayestar_RC1000%20coverage.png
The OT candidate found by Coulter et al. (LVC GCN 21529), the DLT17ck
(Sheng Yang et al., GCN 21531) is out of the coverage in the first epoch
of the observations.
We also cover northern part of GBM/Fermi localization? 1-sigma
containment, statistical only (Connaughton et al., GCN 21506). The
coverage of the GBM localization is about 20%. Typical limiting
magnitude of 17.5m at 60 s exposure in each image. The covering map can
be found in
http://grb.rssi.ru/GRB170817A/GRB170817A_GBM_coverage_ASA500.png
The detailed investigation of the fields is underway.
We are grateful to the remote staff of the observatory for timely
observations.