Difference: GCNCIRCULAR21618 ( vs. 1)

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

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

The detailed investigation of the fields is underway.

We are grateful to the remote staff of the observatory for timely observations.

-- ShaonGhosh - 20 Aug 2017