SN 2003jd

D. Watson, E. Pian (INAF - Astron. Obs. of Trieste), J. N. Reeves (GSFC),
J. Hjorth and K. Pedersen (University of Copenhagen) report:

A 25ks observation of the hypernova SN2003jd (IAUC 8232,8234) which has an
optical spectrum similar to the GRB-associated SNe 1998bw and 2003dh (GCN
2431
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 , 2435
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 ) was performed with Chandra ACIS-S starting 18:47:44 UT Nov.
10.

No source is detected at the position of the supernova with a 3sigma
upper limit for the 0.3-2.0keV band of 5.7e-16 erg/cm^2/s.  At a distance
of 75 Mpc this implies an upper limit to the luminosity 3.8e38 erg/s.
This is at least 40 times fainter than SN1998bw at about 30 days after the
GRB or a factor of >4 fainter than SN1980K and consistent with the X-ray
flux from either SN 1994I or SN2002ap at a similar epoch.

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
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 )
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."

T. Matheson, P. Challis, R. P. Kirshner (CfA) and P. Berlind (FLWO)
report:

We obtained a spectrum (range 370-750 nm) of SN 2003jd (IAUC 8232)
with the F. L. Whipple Obs. 1.5-m telescope and the FAST spectrograph
on Oct 28.32 UT.  The supernova is a peculiar Type Ic and it shows
strong similarities with SN 1998bw near maximum (Patat et al. 2001,
ApJ, 555, 900).  Other peculiar Type Ic SNe (such as SNe 1997ef or
2002ap) do not match up as well with SN 2003jd.  The blue end of the
spectrum is not as consistent with SN 1998bw, highlighting the
heterogeneous nature of these peculiar Ic SNe.  The spectrum and a
comparison with SN 1998bw are available at

http://cfa-www.harvard.edu/cfa/oir/Research/supernova/RecentSN.html

Further observations, especially in other wavelengths, are encouraged.

P.S.  This information will appear in an IAU Circular, but has been
reported here for the benefit of those GCN subscribers who do not read
the IAU Circulars.