GCN Circular 10547
Subject
GROND observations of GRB100316D/SN2010bh
Date
2010-03-26T22:58:43Z (14 years ago)
From
Arne Rau at MPE <arau@mpe.mpg.de>
Arne Rau, Marco Nardini (both MPE Garching), Adria Updike (Clemson
University), Robert Filgas, Jochen Greiner, Thomas Kruehler (all MPE
Garching), and Sylvio Klose (TLS Tautenburg) report on behalf of the
GROND team:
We report on additional observations of the field of GRB 100316D
(Swift trigger 416135; Stamatikos et al., GCN 10496) simultaneously in
g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at
the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started on 17 March 2010 at 00:27 UT, 11.7 hours after
the burst (Afonso et al., GCN Circular #10514). The field was observed
during additional 16 epochs and observations are continuing.
Image subtraction revealed the supernova SN2010bh reported by Wiersema
et al. (GCN Circular #10525), Chornock et al. (GCN Circular #10541),
and Bufano et al. (GCN Circular #10543) to emerge approx. 5 days
post-burst and to reach an AB magnitude of r ~ 18.8 +/- 0.2 at 7.5
days post-burst.
The observed light curve evolution of SN2010bh is similar to that of
SN1998bw (Galama et al. 1998), the supernova associated with
GRB980425, shifted to the redshift of GRB100316D (z=0.059; Vergani et
al., GCN Circular #10512). The optical luminosity is comparable to
SN1998bw, except in the g-band, where the flux is suppressed by
approx. 30%. This likely corresponds to the significant flux
deficiency in the range 450-550nm reported from the X-Shooter spectrum
(Bufano et al., GCN Circular #10543).