TITLE:   GCN CIRCULAR
NUMBER:  32926
SUBJECT: GRB 221110A: LCOGT Optical Afterglow Detection
DATE:    22/11/10 04:44:32 GMT
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 221110A (Williams et al., GCN 32925) field with the
LCOGT 1-meter Sinistro instrument at the Cerro Tololo Interamerican
Observatory, Chile site, on November 10, from 03:12 to 03:40 (corresponding
to 0.73 to 1.20 hours from the GRB trigger time) with the SDSS r and i
filters.

We performed a series of 3x300s exposures in each band.  We detect an
uncataloged source in the Swift error region, in both bands, consistent
with the optical counterpart candidate (Lipunov et al., GCN 32924).

The following magnitudes are calculated using the Pan-STARRS catalog as
reference:

r = 19.45 +/- 0.06
i = 18.19 +/- 0.08

These magnitudes are not corrected for galactic extinction.  Imaging and
spectroscopic follow-up has been conducted with Gemini and analysis is
ongoing.