GCN Circular 9333
Subject
GRB 090509, SMARTS optical/IR afterglow observations
Date
2009-05-10T02:05:34Z (15 years ago)
From
Bethany Cobb at UC Berkeley <bcobb@astro.berkeley.edu>
B. E. Cobb (UC Berkeley) reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the error region of GRB 090509
(Grupe et al. GCN 9325) beginning approximately 0.8 hours post-burst
(2009-05-09 05:59 UT). Several dithered images
were obtained in each filter, with total summed exposure times
of 180s in each of BRIJK and 120s in each of H and V.
The GRB afterglow (Olivares et al. GCN 9326, Covino et al. GCN 9327)
is detected in all filters with the following magnitudes
at a mid-exposure time of 2009-05-09 06:14 UT (1.07 hours
post-burst):
B= 20.18 +/- 0.13
V= 19.68 +/- 0.16
R= 19.02 +/- 0.10
I= 18.76 +/- 0.09
J= 17.70 +/- 0.16
H= 17.07 +/- 0.15
K= 16.48 +/- 0.22
(Optical photometry is calibrated against Landolt standard stars
and IR photometry is calibrated against 2MASS stars in the field.)