GCN Circular 9248
Subject
GRB090424: BVRI/R-band detection after 15 hrs burst
Event
Date
2009-04-25T06:52:02Z (16 years ago)
From
Myungshin Im at Seoul Nat U <mim@astro.snu.ac.kr>
M. Im, W. Park, Y. Jeon, I. Lee (CEOU/Seoul National Univ),
Y.-B. Jeon (KASI) and Y. Urata (NCU) on behalf of EAFON team.
We took BVRI-band images of GRB090424 (GCN 9223)
using the 1.0m telescope at Mt. Lemmon (Arizona, US)
operated by the Korea Astronomy Space Science Institute.
The whole sequence of the observation started at
2009 April 25, 04:30:19 UT, among which R-band observation
started at 04:58:32.22.
From a stacked image of 6 frames (3 min exp. each),
we cleary detect the afterglow at R=19.9 +- 0.14 mag, calibrated
against USNO-B1 stars in the vicinity. The mid-point of the
obseravation is April 25, 05:10:57 UT (14.97 hrs after
the burst).
Analysis of the BVI data is ongoing.
We thank the LOAO operator, J. Yoon for his assistance for this
observation.