GCN Circular 9459
Subject
GRB090530: R-band Observation
Event
Date
2009-05-31T14:49:20Z (16 years ago)
From
Myungshin Im at Seoul Nat U <mim@astro.snu.ac.kr>
M. Im (CEOU/Seoul National Univ) and Y. Urata (NCU)
on behalf of EAFON team.
We observed GRB090530 (Cannizzo et al. GCN 9438) in R using
the 1.0m telescope at Mt. Lemmon (Arizona, US) operated by
the Korea Astronomy Space Science Institute.
The R-band imaging started at 2009 May 30, 04:18:02 UT
(~1 hr after the burst), with the mid-point at May 30,
04:45 UT.
In a stacked image of 9 frames (3 min exp. each),
the optical afterglow is clearly detected
at R=19.6 +- 0.15 mag.
The photometry was calibrated against R2mag of USNO-B1 stars
in the vicinity of GRB.
We thank the LOAO operator, J. Yoon for his assistance for this
observation.