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IAUC 5473: 1992M; 1991bk; N Pup 1991

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                                                  Circular No. 5473
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     J. Mueller reports her discovery of a supernova (mag 18-18.5)
on an IV-N plate taken Feb. 25 with the 1.2-m Oschin Telescope by C.
Brewer and J. D. Mendenhall in the course of the second Palomar Sky
Survey.  The galaxy is located 289" west and 107" north of SAO 41643
(R.A. = 7h11m59s.7, Decl. = +45 29'53", equinox 1950.0); SN 1992M is
3".4 west and 7" south of the galaxy's center.  N. Reid reports that
the object does not appear on an IV-N plate taken in January.
     A. V. Filippenko, T. Matheson, L. C. Ho, and W. D. Vacca,
University of California at Berkeley, report that preliminary
inspection of low-quality uncalibrated spectra (range 340-1000 nm),
obtained on Mar. 13 UT with the Shane 3-m reflector at Lick
Observatory, suggests that SN 1992M is a type-Ia supernova within a few
weeks past maximum brightness.

SUPERNOVA 1991bk IN UGC 7171
     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of an apparent supernova located 5".0 east and 7".1 south of the
center of UGC 7171.  SN 1991bk was visible at mag about 18.5 on Tech
Pan films (limiting mag 21) taken with the OCA Schmidt telescope on
1991 Apr. 15.0 and 19.9 and May 6.9 UT, but does not appear on the
Palomar Sky Survey prints (limiting mag 19) or on a Tech Pan film taken
by Pollas on 1992 Mar. 12.1 (limiting mag 20.5).  SN 1991bk is located
at R.A. = 12h08m09s.04, Decl. = +13 36'26".8 (equinox 1950.0).

     R. M. Hjellming, National Radio Astronomy Observatory, reports
the detection of a radio counterpart of Nova Pup 1991 on Mar. 7 made
with the Very Large Array.  The radio source at that time was 0.5,
1.2, and 3 mJy at 4.9, 8.4, and 14.9 GHz, at R.A. = 8h09m44s.04 +/-
0s.1, Decl. = -37 58'31" +/- 3" (equinox 1950.0), which is consistent
with the optical position (IAUC 5422).  The radio spectrum is
as expected for the detection of a classical nova during the rising,
optically thick phase of the radio light curve.  Observations of
Nova Cyg 1992 at the same time indicated that a radio source had not
yet appeared, at levels of 0.5 mJy, for the same frequencies.

1992 March 13                  (5473)             Daniel W. E. Green

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