TITLE:   GCN CIRCULAR
NUMBER:  34939
SUBJECT: GRB231104A: LCOGT Optical Upper Limits
DATE:    23/11/04 04:09:15 GMT
FROM:    Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>

R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:

We observed the Fermi GRB 231104A field (Fermi GBM team, GCN 34937) with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory, USA site, on November 4, from 02:53 to 03:25 UT (corresponding to 1.10 to 1.63 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 within the Swift-XRT error region around the candidate X-ray source (Page et al., GCN 34938) in either band.

The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:

r > 22.6
i > 21.8

These magnitudes are not corrected for galactic extinction.