GCN Circular 3104
Subject
GRB 050315, SMARTS optical/IR afterglow observations
Event
Date
2005-03-16T22:18:02Z (21 years ago)
From
Bethany Cobb at Yale U <cobb@astro.yale.edu>
B. E. Cobb and C. D. Bailyn (Yale), part of the larger SMARTS
consortium, report:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the error region of GRB 050315
(GCN 3094, Parsons et al.) beginning ~11.6 hours post-burst
(2005-03-16 08:35:09 UT). Total summed exposure times amounted
to 180s in BRIYJK and 120s in H and V.
An optical source is detected in R and I at the coordinates of the
reported optical afterglow candidate (GCN 3100, Kelson & Berger). This
source is, however, only slightly brighter than our detection limits.
Preliminary comparison with Landolt Standard PG 1047+003 and USNO B1.0
stars yields the following approximate afterglow magnitudes:
R = 20.9
I = 20.3
No source was detected in B or V with upper limits of B > 22.3 and V > 21.4.
Additionally, the afterglow candidate is not detected in the IR images to
the following detection limits (obtained by comparison with 2MASS):
J > 18.0
H > 17.4
K > 16.3