TITLE: GCN CIRCULAR NUMBER: 22538 SUBJECT: GRB 180325A: Optical Photometry with SLKT DATE: 18/03/25 06:42:44 GMT FROM: Peter Garnavich at U of Notre Dame C. Littlefield and P. Garnavich (Notre Dame) report: We observed the field of GRB 180325A (GCN 22532) with the 0.8-m Sarah L. Krizmanich Telescope at the University of Notre Dame. Unfiltered CCD images were obtained under hazy conditions beginning 1.5 hours after the burst. We calibrated the afterglow in SDSS-r using a nearby star in the Pan-STARRS catalog and constructed the following light curve: DateAge SDSS-r err (UT) (hours) March 25.1403 1.483 19.29 0.14 March 25.1626 2.018 19.52 0.18 March 25.227 3.564 20.1 0.3 Based on SDSS-r magnitudes reported by Heintz et al. (GCN 22535) and Guidorzi et al. (GCN 22534), we obtain a rather shallow power-law decay index of 0.31+/-0.05 between 0.5 hours and 2 hours after the burst.