GCN Circular 14393
Subject
GRB 130418A: LOAO Observation
Event
Date
2013-04-19T14:34:07Z (13 years ago)
From
Myungshin Im at Seoul Nat U <mim@astro.snu.ac.kr>
M. Im (CEOU/SNU), H.-I. Sung(KASI), and Y. Urata (NCU)
on behalf of EAFON
We observed the field of GRB 130418A (Pasquale et al., GCN 14377)
in R, I, and z filters using the 1-m telescope at Mt. Lemmon
observatory in Arizona, US.
The observation started at 2013-04-19 03:40 UT,
or about 8.6 hours after the BAT alert, and continued for
about 45 min. We clearly identify the fading afterglow in
R- and I-band, at the location reported earlier (Gorosabel et al.
GCN 14378; Quadri et al. GCN 14379; de Ugarte Postigo et al. GCN14380;
D'Avanzo et al. GCN 14381; Klotz et al. GCN14382; Kuin et al.
GCN14384; Tello et al. GCN 14385; Nardini et al. GCN 14386;
Perley et al. GCN 14387; Butler et al. GCN 14388; Covino et al.
GCN 14389; Kruehler et al. GCN 14390). On the other hand,
the detection in z-band is marginal.
Preliminary magnitudes of the afterglow, calibrated against
a USNO B-1 star at RA=140.047350 and Dec=+13.655828 are given below:
T(mid, UT) Mag
04-19 03:58:26 R=18.95 +- 0.07
04-19 04:04:16 I=18.18 +- 0.08
We thank the LOAO operator, Jae-Hyuk Yoon for performing
the observation.