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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."
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