GCN Circular 10543
Subject
Emerging Supernova in the Afterglow of GRB 100316D
Date
2010-03-24T13:37:52Z (14 years ago)
From
Filomena Bufano at INAF-Osb Astro di Padova <filomena.bufano@oapd.inaf.it>
F. Bufano, S. Benetti, E. Cappellaro, INAF Osservatorio Astronomico di
Padova (INAF-OAPd); S. Covino, INAF Osservatorio Astronomico di Brera
(INAF-OABr); S. Vergani, P.Goldoni, GEPI (Observatoire de Paris) - APC
(Universit� Paris 7); M. Della Valle, INAF Osservatorio di
Capodimonte; E. Pian, INAF Osservatorio Astronomico di Trieste; S.
Campana, G.Tagliaferri, INAF-OABr; D.Malesani, J. Fynbo, Dark
Cosmology Centre; M. Turatto, INAF Osservatorio Astronomico di
Catania; F.Patat, European Southern Observatory (ESO) and P. Mazzali,
INAF-OAPd report on behalf of a larger colaboration that a high-dispersion
optical spectrum (range 350-900 nm, resolution 0.02 nm) of the afterglow
associated to GRB 100316D (cf. GCN 10496) was obtained with the VLT telescope
(+XShooter) at ESO-Paranal on March 23.04 UT. The spectrum of the
source located at R.A.=07:10:31.8 and Decl.=-56:15:20.2, J2000.0 (as
measured on the XShooter acquisition image) shows very broad bumps
with peaks measured at about 430nm and 670nm reminiscent of an
emerging broad line type Ic supernova (in agreement with Chornock et al,
GCN 10541). Indeed, above 600 nm the spectrum of this source
shows some similarities with that of SN 1998bw (Patat et al. 2001,
ApJ, 555, 900) taken 7 days after outburst.
There are however major differences with the spectrum of this
transient, showing a significant flux deficiency in the range
450-550nm in comparison with SN 1998bw .
[GCN OPS NOTE(24mar10): Per author's request, the parenthetical
comment "(in agreement with Chornock et al, GCN 10541)"
was added.]