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THE ASTRONOMER Electronic Circular No 1875      2003 Apr 11 14.56UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK             GMH at AST.STAR.RL.AC.UK
WORLD WIDE WEB                         http://www.theastronomer.org
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GRB 030329 = SUPERNOVA 2003dh
Tom Matheson (CfA) and others have reported further details of this
object (cf TA E-Circular 1868, 1869) on GCN 2107. They obtained
spectra of the afterglow of GRB 030329 with the 6.5-m MMT and Blue-
Channel spectrograph each night from March 30.12 to April 6.15
(UT). The spectra cover a wavelength range of 350 nm to 850 nm with
a resolution of 0.6 nm (FWHM). The early spectra consist of a
power-law continuum with narrow emission lines originating from HII
regions in the host galaxy. However, a spectrum taken Apr. 6.15
(UT) shows a broad peak in flux at approximately 570nm and another
weak deviation from a power-law near 470nm that were not evident in
the earlier spectra.

The April 6 spectrum is well reproduced by adding a spectrum of SN
1998bw seven days before maximum light to a power-law distribution.
They conclude that a supernova spectrum is emerging from the
afterglow light. The brightness of the supernova is approximately
V=22 based on the strengths of the broad features relative to a
pure power-law. Further spectroscopy is planned.


Since the issue of the two earlier TA E-Circulars, reports have
been received from Arto Oksanen, Nick James, Martin Mobberley,
David Strange, Peter Birtwhistle, Gordon Rogers, Tom Boles, John
Fletcher and Azz for which we are very grateful. We have awaited a
photometric sequence for the field, which is now available courtesy
of Arne Henden (USA), so a preliminary reduction of magnitudes can
be undertaken.

If anyone has images they have not sent through please e-mail them
and similarly if you do not appear in the above list (probably
because of the lengthy telephone outage here and lost e-mails)
please send through your reports. At this stage 'jpegs' or similar
will suffice but if a more detailed analysis is needed at
professional level we will contact you for FITS files.

Finally the designation 2003dh has been assigned to the supernova
emerging from the afterglow of GRB 030329, according to IAUC 8114.

Guy M Hurst