GCN Circular 17696
Subject
GRB 150413A: P60 photometry
Event
Date
2015-04-14T04:41:01Z (11 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (Caltech) and S. B. Cenko (GSFC) report:
The Palomar 60-inch telescope observed the location of the optical
counterpart of GRB 150413A (Markwardt et al., GCN 17688; Ivanov et al.,
GCN 17689) starting at 03:15:21 UT on 2015-04-14. We acquired 3x180s
images in griz filters under good conditions.
The optical transient is well-detected in all four filters. Calibrating
relative to USNO stars in the field, we measure a magnitude of R = 19.1
(+/- 0.1) mag at this time (t = 0.560 days after the BAT trigger),
indicating significant fading since the early observations.
Further follow-up is planned.