TITLE:   GCN CIRCULAR
NUMBER:  33740
SUBJECT: GRB 230506B: LCOGT Optical Upper Limits
DATE:    23/05/07 15:34:37 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 230506B (Dichiara et al., GCN 33727) field with the
LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site,
on May 7, from 04:09 to 04:41 UT (corresponding to 15.43 to 15.93 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
an uncatalouged source within the Swift-XRT error region in either band.

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

r > 22.3
i > 21.8

These magnitudes are not corrected for galactic extinction.