Radio observations of SNLS-04D2jz
ATel #376; Avishay Gal-Yam (Caltech)
on 4 Jan 2005; 21:58 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Avishay Gal-Yam (avishay@astro.caltech.edu)
Subjects: Radio, Gamma-Ray Burst, Supernovae
A. Gal-Yam, A. Soderberg and M. Sullivan report for
a larger collaboration:
We have observed with the Very Large Array (VLA)
the location of supernova SNLS-04D2jz, discovered on November
21, 2004 by the Supernova Legacy Survey (SNLS),
using Megacam mounted on the
3.6m CFHT telescope. Spectroscopy obtained by R. Ellis and
M. Sullivan using the Keck I 10m telescope (+LRIS)
shows this event is of type Ib/c, spectroscopically similar
to SN 1998bw (associated with GRB 980425),
at a redshift of z=0.323. Analysis of our radio
data (1hr integration at 8.5 GHz) does not yield a detection
of the SN. The flux measured at the optical position is
31 +/- 26 uJy at 8.5 GHz. Correcting for the luminosity
distance (assuming standard concordance cosmology) we find
that this event may have been as radio luminous as local
type Ib/c SNe (including SN 1998bw) but does not have a radio
afterglow signature expected from long-duration GRBs at
comparable redshifts, which would have been easily detected
by our VLA observations.
