[vsnet-grb-info 24462] GRB 191221B: Zadko observatory - Gingin optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Dec 23 04:46:01 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 26561
SUBJECT: GRB 191221B: Zadko observatory - Gingin optical observations
DATE: 19/12/22 19:43:01 GMT
FROM: Bruce Gendre at UVI <bruce.gendre at gmail.com>
B. Gendre (OzGrav-UWA), H. Crisp (OzGrav-UWA), J. Moore (OzGrav-UWA),
D. Coward (OzGrav-UWA), A. Klotz (IRAP-CNRS-OMP), P. Thierry (Aragne
Observatory), A. Burrell (OzGrav-UWA), J. Zadko (Claire Energy),
M. Boer, (UNS-CNRS-OCA)
report:
We imaged the field of GRB 191221B detected by Swift (trigger 945521,
Laha et al. GCN 26534) with the Zadko robotic telescope (D=100cm)
located at the Zadko observatory - Gingin, Australia.
The observations started 19 hours after the GRB trigger. The elevation
of the field was at 32 degrees above horizon and weather conditions
were good. We performed 6 long exposures of 180s in Clear filter.
We detected the candidate couterpart mentioned by Lipunov et al. (GCNC
26537) in each of the images.
OT was R~17.6+/-0.2 at that time. Further analysis and observations are
ongoing.
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
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