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GCN Circular 23786

GRB 190123A: AROMA-N Optical Observation
2019-01-24T14:59:31Z (5 years ago)
Takanori Sakamoto at AGU <>
M. Nakamura, T. Sakamoto (AGU)

We observed the field of GRB 190123A detected by Swift
(D'Ai et al., GCN Circ. 23769) with the 14-inch AGU Robotic
Optical Monitor for Astrophysical object - Narrow (AROMA-N)
located at the Sagamihara campus of Aoyama Gakuin University.

30 images of 60 sec exposures were taken in the R filter
starting from January 23 12:21:49 (UT) about 156 seconds
after the trigger and stopped on January 23 12:58:25 (UT).
We do not detect the optical afterglow both in the individual
images and the stacked image.  The estimated five sigma
upper limit of the combined image (total exposure of 1800 sec)
is ~17.7 mag using the USNO-B1 catalog.
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