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IAUC 6469: 1996as; GAMMA-RAY BURST 960720; 1996 PW

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                                                  Circular No. 6469
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1996as IN ANONYMOUS GALAXY
     B. P. Schmidt, Mount Stromlo and Siding Spring Observatories,
reports the discovery of a supernova (mag about 17.5) by R. O.
Evans on a U.K. Schmidt film taken by M. Drinkwater on Sept. 3 as
part of the U.K. Schmidt Supernova Search.  SN 1996as is located at
R.A. = 21h05m36s.3, Decl. = -52 22'41".2 (equinox 2000.0), which is
about 15" northwest of the galaxy's nucleus.  SN 1996as was not
visible on a similar film taken on Aug. 14.
     S. Benetti and M. Turatto, European Southern Observatory
(ESO), obtained a spectrum (range 515-927 nm, resolution 1.1 nm) of
SN 1996as on Sept. 6.02 UT at La Silla with the 2.2-m ESO/MPI
telescope (+ EFOSC-2).  The object is a type-II supernova with a
blue [T(BB) about 10 400 K] continuum and broad emission lines of
H-alpha (FWHM = 13 800 km/s) and He I (FWHM = 10 000 km/s).  The
spectrum's continuum slope and line profiles resemble that of SN
1992H on day 13 after explosion (Clocchiatti et al. 1996, A.J. 111,
1286).  The redshift of the galaxy, measured from narrow emissions
of H-alpha and [N II] superimposed on the galaxy spectrum, is 0.036.


GAMMA-RAY BURST 960720
     T. Boller and W. Voges, Max-Planck-Institut fur
Extraterrestrische Physik, Garching, report:  "Within the 10' error
box centered on the SAX position of the July 20 gamma-ray burst
(IAUC 6467), we have found a faint x-ray source in the ROSAT all-
sky survey data.  The ROSAT source is centered at R.A. = 17h29m34s,
Decl. = +49 05'.8 (equinox 2000.0; estimated error 30" in 1-sigma
radius), which is within 3'.7 of the SAX position.  The PSPC
countrate in the ROSAT hard-energy band (0.5-2.0 keV) was 0.007 +/-
0.002 count/s during 1990 Aug. 22-28.  This is the only ROSAT x-ray
source within the SAX error circle.  It is not clear if this source
relates to the gamma-ray burst."


1996 PW
     I. P. Willams, Queen Mary and Westfield College, London; and M.
Cartwright and A. Fitzsimmons, Queen's University, Belfast, report
the following B, R, and B-R photometry of 1996 PW made at the 1.0-m
Jacobus Kapteyn Telescope on La Palma:  Sept. 2.0111 UT, -, 16.81,
-; 2.0306, 18.12, -, +1.31; 3.0014, -, 17.15, -; 3.0174, 18.39, -,
+1.24; 3.0361, -, 17.12, +1.27; 4.0174, -, 17.09, -; 4.0299, 18.33,
-, +1.24.

                      (C) Copyright 1996 CBAT
1996 September 6               (6469)            Daniel W. E. Green

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