TITLE:   GCN CIRCULAR
NUMBER:  34112
SUBJECT: GRB 230628E: LCOGT Optical Upper Limit
DATE:    23/06/29 00:32:59 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 230628E (Klingler et al., GCN 34110) field with the LCOGT
1-meter Sinistro instrument at the Cerro Tololo Interamerican Observatory,
Chile site, on June 28, from 23:08 to 23:40 UT (corresponding to 0.70 to
1.23 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 (Klingler et al., GCN 34110) in
either band.

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

r > 19.2

i > 19.0

These magnitudes are not corrected for galactic extinction.