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IAUC 6491: 1996bk; PSR 0833-45; C/1996 R1; SNe

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                                                  Circular No. 6491
Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1996bk IN NGC 5308
     Piero Mazza and Stefano Pesci, Milan, report their visual
discovery with a 0.40-m reflector of an apparent supernova (mag
14.5-15.0) on Oct. 12.79 UT, located about 20" southwest of the
nucleus of NGC 5308.  The object is not present in various
photographic atlases.  Nothing unusual was noted by Pesci on Aug.
15 at this location.  M. Schwartz, Cascade Mountains, OR, obtained
a CCD image showing the new object on Oct. 13; no star is present
at this position on an image of the galaxy taken by Schwartz on
June 5.  J. Mackey, Werrington, England, reports the following CCD
position obtained on Oct. 13.795 UT:  R.A. = 13h46m57s.98, Decl. =
+60o58'12".9 (equinox 2000.0); he measured the magnitude of SN
1996bk as V = 14.05.  G. Comello, Groningen, The Netherlands,
reports the following visual magnitude estimates:  Oct. 13.82,
13.9; 14.80, 14.1.
     P. Garnavich and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics, report that spectra obtained by J. Huchra and L.
Macri on Oct. 15.1 UT with the 1.5-m Tillinghast telescope show
that this is a type-Ia supernova about a week past maximum light.
CCD images taken with the Whipple Observatory 1.2-m reflector show
SN 1996bk to be 10".5 south and 17".9 west of the galaxy center, at
magnitude V = 15."

PSR 0833-45
     C. Flanagan, Hartebeesthoek Radio Astronomy Observatory (HRAO),
reports that a large spin-up in PSR 0833-45 (the Vela pulsar) was
observed from the HRAO, the relative increase (delta f)/f in spin-
rate being +2.15(2) x 10E-6 on Oct. 13.394 UT.

     Total visual magnitude estimates:  Sept. 30.77 UT, 11.6 (K.
Hornoch, Lelekovice, Czech Republic, 0.35-m reflector); Oct. 8.25,
13.0 (R. Keen, Mt. Thorodin, CO, 0.32-m reflector); 13.86, 12.5 (K.
Sarneczky, Raktanya, Hungary, 0.44-m reflector);

     Corrigendum.  Regarding the item on IAUC 6490, B. Schmidt
reports that P. Garnavich (CfA) was also observing on the MMT with
R. Kirshner.

                      (C) Copyright 1996 CBAT
1996 October 15                (6491)            Daniel W. E. Green

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