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GCN Circular 33208

Subject
GRB 230123A: Zadko observatory - Gingin optical observations
Date
2023-01-23T14:31:21Z (a year ago)
From
Bruce Gendre at UVI <bruce.gendre@gmail.com>
B. Gendre (UWA/OzGrav), G. Stratta (INAF/Goethe University Frankfurt),
E. Moore (UWA/OzGrav), F. Panther (UWA/OzGrav), D. Coward (UWA/OzGrav),
J. A. Moore (OzGrav-UWA), A. Klotz (IRAP-CNRS-OMP), and P. Thierry (AGORA)
report:

We imaged the field of GRB 230123A detected by SWIFT
(trigger 1150429, GCN 33206, Williams et al. 2023)
with the Zadko robotic telescope (D=100cm)
located at the Zadko observatory - Gingin, Australia.

The observations started 2.56h after the GRB trigger (t0+9213.4s).
The elevation of the field decreased from
51 degrees above horizon and weather conditions
were good.

We observed the field for one hour, and have not detected any afterglow
down to magnitude 18.7 in individual images. On a stack of 6 images, we reached
an upper limit of R = 19.0 with no detection of the afterglow.
Further observations are planned.

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

N.B. Galactic coordinates are lon=286.2098 lat=-47.6419
and the galactic extinction in R band is 0.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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