GCN Circular 19354
Subject
GRB 160425A: SMARTS optical/IR observations
Event
Date
2016-04-26T20:51:10Z (10 years ago)
From
Bethany Cobb at GWU <bcobb@gwu.edu>
B. E. Cobb (GWU), reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained
optical/IR imaging of the error region of GRB 160425A (GCN 19343,
Krimm et al.) at two epochs. For each epoch, total summed exposure times
amounted to 15 minutes in I and V and 12 minutes in J and K.
No source is detected at the position of the optical
afterglow (e.g. GCN 19343, Krimm et al.; GCN 19344, Lipunov
et al.; GCN 19349, Bodensteiner et al.) to the approximate limiting
magnitudes listed below. The first epoch was obtained under particularly
poor seeing conditions.
mid-exposure mid-exposure time
time post-burst
limits
2016-04-26 04:53 UT 5.44083 hours I > 19.5 J > 16.6 K > 15.7
2016-04-26 08:29 UT 9.04250 hours I > 19.9 J > 17.9 K > 17.1
Magnitudes are calibrated using USNO-B1.0 stars in I, and
2MASS stars in J and K.