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IAUC 7131: 1999az, 1999ba, 1999bb; S4 0954+65

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                                                  Circular No. 7131
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVAE 1999az, 1999ba, 1999bb
     L. G. Strolger, University of Michigan; and R. C. Smith, Cerro
Tololo Interamerican Observatory (CTIO), report for the Nearby
Galaxies Supernova Search team (cf. IAUC 7125) and the Supernova
Cosmology Project (cf. IAUC 7125, 7128) the discovery of three
supernovae in R-band images taken with the Kitt Peak 0.9-m
telescope (+ MOSAIC camera):

1999az  Feb. 23   10 18 56.37    -10 25 18.1    20.5    near center
1999ba  Feb. 23   10 19 19.37    - 2 49 39.0    20.0    near center
1999bb  Feb. 23   11 05 16.47    - 6 01 32.5    20.6     ?

Based on spectra taken by Strolger and Smith on Mar. 17 UT at the
CTIO 4-m telescope, P. Nugent (Lawrence Berkeley Laboratory) and M.
Phillips (Las Campanas Observatory) identify SN 1999az as a type-Ia
supernova (redshift about 0.15), observed about 1 month past
maximum brightness, and SN 1999ba as a type-Ia event (redshift
about 0.09), observed between 20 and 30 days past maximum
brightness.  Both SNe 1999az and 1999ba are slightly offset from the
core of their apparent host galaxies.  Based on spectra taken by
Strolger and Smith on Mar. 18 at the same telescope, SN 1999bb has
been identified as a type-II supernova, between 20 and 30 days past
maximum brightness (redshift about 0.18); no host is apparent in
the discovery images.  Finding charts for the three objects
(identified as nb-125, nb-092, and nb-088, respectively) can be
obtained from http://panisse.lbl.gov/nearsearch/fcharts/index.html.
The Nearby Galaxies Supernova Search team was also involved in the
discoveries of SNe 1999au, 1999av, and 1999aw reported on IAUC 7130.


S4 0954+65
     C. M. Raiteri, M. Villata, G. Massone, G. De Francesco, L.
Lanteri, L. Ostorero, M. Puccio, and G. Sobrito, Osservatorio
Astronomico di Torino; and G. Tosti, Universita di Perugia, report:
"S4 0954+65 (cf. Pauliny-Toth et al. 1978, A.J. 83, 451) is
undergoing a major optical outburst (see Blazar Data News 14 and
19, http://bldata.pg.infn.it/news_index.html); CCD data taken with
the Torino 1.05-m and the Perugia 0.4-m telescopes on Mar. 24.97
and 25.00 UT show a new historical maximum at R = 14.63 +/- 0.03.
Observations at other wavelengths are strongly encouraged."

                      (C) Copyright 1999 CBAT
1999 March 26                  (7131)            Daniel W. E. Green

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