TITLE: GCN CIRCULAR NUMBER: 32610 SUBJECT: GRB 220930A: LCOGT Optical Upper Limits DATE: 22/10/01 04:03:35 GMT 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.