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IAUC 8114: GRB 030329, 2003dh; 2003di

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                                                  Circular No. 8114
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


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
http://cfa-www.harvard.edu/~tmatheson/compgrb.jpg.
     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.


SUPERNOVA 2003di
     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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