GCN Circular 33188
Subject
GRB 230116D: LCOGT Optical Upper Limit
Date
2023-01-17T15:59:16Z (a year ago)
From
Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>
R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on
behalf of a larger collaboration:
We observed the GRB 230116D (Sonbas et al., GCN 33176) field with the LCOGT
1-meter Sinistro instrument at the McDonald Observatory, TX, USA site, on
January 17, from 05:24 to 05:56 UT (corresponding to 8.33 to 8.64 hours
from the GRB trigger time) with the SDSS r and i filters.
We performed a series of 3x300s exposures in each band. We do not detect a
source in either band within the XRT enhanced error region (Osborne et al.,
GCN 33180). This suggests fading compared to other optical detections (Zhu
et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al., GCN 33179;
Swain et al., 33182).
The following magnitudes and upper limits are calculated using the
PanSTARRS catalog as reference:
r > 22.2
i > 21.2
These magnitudes are not corrected for galactic extinction.