TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2435
SUBJECT: SN 2003jd (SN/GRB?), Radio Observations 
DATE:    03/10/30 01:30:43 GMT
FROM:    Alicia Soderberg at Caltech  <ams@astro.caltech.edu>

A. M. Soderberg, S. R. Kulkarni (Caltech) and D. A. Frail (NRAO) report:

"We observed the peculiar type Ic SN 2003jd (IAUC 8232,8234; GCN 2431)
with the VLA on Oct 29.15 UT at 4.9, 8.5 and 22.5 GHz.  We
do not detect the supernova and place the following 3 sigma limits on
the radio emission from the source: 0.16, 0.10, and 0.17 mJy, respectively.

At a distance of 80.8 Mpc, the radio luminosity of SN 2003jd at 8.5
GHz is at least a factor of 100 lower than that of SN 1998bw at a
similar epoch.  Furthermore, making the typical assumption of
equipartition, we place an upper limit on the ejecta energy of 4x10^45
erg, a factor of 10^4 lower than that inferred for SN 1998bw (Kulkarni
et al. 1998, Nature, 395, 663; Li & Chevalier 1999, ApJ, 526, 716) but
similar to the energy inferred for SN 2002ap (Berger et al. 2002, ApJ,
577, L5).

Further observations are planned."