GCN Circular 22538
Subject
GRB 180325A: Optical Photometry with SLKT
Event
Date
2018-03-25T06:42:44Z (8 years ago)
From
Peter Garnavich at U of Notre Dame <pgarnavi@nd.edu>
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.