Introduction

Despite active campaigns to study radio emission from type Ib/c supernovae, only a small number of events have been successfully detected. Among the class of radio bright supernovae is SN1998bw, an unusually bright type Ic discovered within the error box of the nearby gamma-ray burst GRB 980425. Reaching a peak radio luminosity ~ 100 times higher than all other radio bright type Ib/c supernovae (SNe), it has been proposed that SN1998bw was powered by a central engine, similar to the popular model for gamma-ray bursts (GRBs) [3].

In this paper we present observations of the first radio bright type Ib/c supernova with energetics comparable to those shown in SN1998bw. SN2003L was optically discovered on 2003 Jan 12.15 UT [2] and spectroscopically identified on 2003 Jan 25.0 UT [5, 8]. The supernova was seen to bear strong resemblance to the typical type Ic SN1994I at maximum light, showing low average expansion velocities of 5900 km/s as derived from the Si II line. The optical lightcurve peaks at mV « 16 which places SN2003L among the brightest optical type Ic's observed to date.

10 100 time (doys)

time (doys)

time (doys)

Fig. 1. Radio lightcurves for type Ic SN 2003L at 8.5, 15., and 22.5 GHz for the time period 2003 Jan 26 - 2003 Aug 15 UT.

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