GCN Circular 10644
Subject
GRB 100418A: further GROND observations and light curve fit
Date
2010-04-21T19:20:41Z (14 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
R. Filgas (MPE Garching), D. A. Kann, S. Klose (all Tautenburg),
M. Nardini, and J. Greiner (all MPE Garching), report on behalf of the GROND
team:
GROND on La Silla (Greiner et al. 2008, PASP 120, 405) continues
observing the afterglow of GRB 100418A. GROND data, with the first epoch
at 28 ks after the burst and the last data point at 133 ks after the
burst, in combination with data from Updike et al. (GCN 10619), Antonelli
et al. (GCN 10620), Malesani (GCN 10621), Pearson et al. (GCN 10626),
Malesani et al. (GCN 10631), Rumyantsev et al. (GCN 10634), Bikmaev et al.
(GCN 10635), Updike et al. (GCN 10637), and Bikmaev et al. (GCN 10643),
show that the R-band afterglow light curve had a break at t = 1.11 +/-
0.01 days and is now decaying with a slope of 2.41 +/- 0.08.
While the steep decay of the afterglow is in favor of a SN search, the
bright host (Malesani, GCN 10621) might make a detection difficult.
Assuming a SN 1998bw template, a Galactic visual extinction along the line
of sight of 0.2 mag, no GRB host extinction but 0.2 mag host extinction
for SN 1998bw, we predict the following SN peak times and magnitudes:
band dt/days mag
V 21.5 24.5
R 22.5 23.7
I 24.0 22.9
J 29.5 22.8
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