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GCN Circular 33069

GRB 221216A: Zadko observatory - Gingin optical observations
2022-12-16T13:45:05Z (a year ago)
Bruce Gendre at UVI <>
B. Gendre, H. Crisp, E. Moore, F. Panther, D. Coward, J. A. Moore
(OzGrav-UWA), A. Klotz (IRAP-CNRS-OMP),
and P. Thierry (AGORA),

We imaged the field of GRB 221216A detected by SWIFT
(trigger 1144698) with the Zadko robotic telescope (D=100cm)
located at the observatory - Gingin, Australia.

The observations started 1.39h after the GRB trigger.
The elevation of the field decreased from
35 degrees above horizon and weather conditions
were good.

On individual images taken between t0+4994.4s and t0+7433.4s,
we do not detect any OT with a limiting magnitude of: R > 17.5

On a co-added series of exposures between t0+4993s to t0+6613s,
we estimated a limiting magnitude of R > 19.0

Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.

N.B. Galactic coordinates are lon= 10.7381 lat=-49.4597
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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