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IAUC 8114: GRB 030329, 2003dh; 2003di

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                                                  Circular No. 8114
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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GRB 030329 AND SUPERNOVA 2003dh
     P. Garnavich, University of Notre Dame; T. Matheson, Harvard-
Smithsonian Center for Astrophysics (CfA); E. W. Olszewski,
University of Arizona; P. Harding, Case Western Reserve University;
and K. Z. Stanek, CfA, report that additional spectra of the
afterglow of GRB 030329 (IAUC 8101) and suspected supernova (IAUC
8108) were obtained with the 6.5-m MMT reflector on Apr. 8.13 UT.
The spectral features reported by Garnavich et al. (ibid.) continue
to develop.  Subtracting a scaled version of the power-law spectrum
of Apr. 4.27 from that of Apr. 8.13 reveals an energy distribution
remarkably similar to that of SN 1998bw a week before maximum light
(Patat et al. 2001, Ap.J. 555, 900).  This is the first spectral
confirmation linking supernovae to classical gamma-ray bursts (GRBs).
This spectrum can be seen at
     R. Chornock, R. J. Foley, A. V. Filippenko, M. Papenkova, and
D. Weisz, University of California, Berkeley, write: "Inspection of
CCD spectra (range 310-1000 nm) of GRB 030329, obtained on Apr. 8
UT with the Shane 3-m telescope at Lick Observatory, confirms the
emergence of broad bumps (especially at rest-frame 500 nm)
characteristic of the peculiar type-Ic supernovae 1998bw and 2002ap
at early times, as announced by Garnavich et al. on IAUC 8108.  The
association between core-collapse supernovae and at least some of
the long-duration GRBs thus seems solid.  We expect the supernova
features to continue strengthening with time relative to the power-
law continuum of the GRB afterglow."
     The designation 2003dh has been assigned to the supernova
emerging from the afterglow of GRB 030329.

     Further to IAUC 8112, W. M. Wood-Vasey, G. Aldering, P.
Nugent, and K. Quinones report the discovery of an apparent
supernova (mag 17.8) on unfiltered NEAT images taken on Feb. 4.58-
4.60 UT.  The new object is located at R.A. = 12h00m24s.08, Decl. =
+11o58'26".5 (equinox 2000.0), which is 17".1 east and 11".2 north
of the center of the apparent host galaxy.  Additional magnitudes
for SN 2003di:  2002 Feb. 22.53, [20.6; Apr. 1.41, [20.5; 2003 Feb.
11.60, 17.1; 24.64, 17.2; Mar. 7.54, 17.9; 14.40, 18.0; 25.39,
18.4; Apr. 8.15, 19.2.

                      (C) Copyright 2003 CBAT
2003 April 9                   (8114)            Daniel W. E. Green

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