GCN Circular 32610
Subject
GRB 220930A: LCOGT Optical Upper Limits
Event
Date
2022-10-01T04:03:35Z (3 years ago)
From
Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>
R. Strausbaugh (University of Minnesota), A. Cucchiara (College of Marin)
report on behalf of a larger collaboration:
We observed the Swift GRB 220930A (Cenko et al., GCN 32603) field with the
LCOGT 1-meter Sinistro instrument at the South African Astronomical
Observatory site, on October 1, from 00:42 to 01:24 (corresponding to 13.52
to 14.22 hours from the GRB trigger time) with the SDSS i and r filters.
We performed a series of 3x300s exposures in i and r bands. We do not
detect any uncatalogued sources in the XRT enhanced error region (Evans et
al., GCN 32608), in either band, consistent with other optical upper limits
(Watson et al., GCN 32604; Hu et al., GCN 32606; Belles et al., GCN 32609).
The following upper limits are calculated using the Pan-STARRS catalog as
reference:
r > 22.08
i > 21.73
These magnitudes are not corrected for galactic extinction.