[vsnet-grb-info 21203] GRB 180930A: TSHAO optical upper limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Oct 4 02:11:33 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 23302
SUBJECT: GRB 180930A: TSHAO optical upper limit
DATE: 18/10/03 17:10:51 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
E. Mazaeva (IKI), A. Kusakin (FAPHI), A. Pozanenko (IKI), I. Reva
(FAPHI), A. Volnova (IKI), M. Krugov (FAPHI) report on behalf of larger
GRB follow-up collaboration:
We observed the field of GRB 180930A (Tohuvavohu et al., GCN 23279)
with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory
starting on September 30 (UT) 21:55:14, obtaining a total of 31*120 s
exposure in the Rc-band. Within enhanced XRT position (Osborne et al.,
GCN 23282) we do not detect any object. Preliminary photometry of the
field is following.
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2018-09-30 21:55:14 0.41030 R 31*120 n/d n/d 20.1
The photometry is based on several nearby USNO-B1.0 stars.
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