Central Bureau for Astronomical Telegrams
IAUC 7326: 1999gg; 1999gb; V1494 Aql
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Circular No. 7326
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1999gg IN MCG +7-8-11
G. M. Hurst, Basingstoke, England, reports the discovery by
Tom Boles, Wellingborough, of a supernova (mag about 16.8) on an
unfiltered CCD frame taken on Nov. 6.965 UT in the course of the
U.K. Nova/Supernova Patrol with a 0.36-m reflector; the new object
is lcoated at R.A. = 3h27m58s.9, Decl. = +39o54'18".4 (equinox
2000.0). M. Schwartz, Cottage Grove, OR, obtained a CCD image
showing SN 1999gg on Nov. 23, but the new object is not visible to
mag about 18 on an image taken by Schwartz on 1998 Nov. 1.
S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that spectra of SN
1999gg, obtained by E. Falco on Dec. 2.28 and 3.25 UT with the F.
L. Whipple Observatory (FLWO) 1.5-m telescope (+ FAST spectrograph),
show it to be a type-II supernova. The spectrum is heavily
contaminated by the host galaxy, but a broad P-Cyg H-alpha profile
is visible, as well as broad H-beta absorption. The photospheric
expansion velocity of the supernova, measured from the H-alpha
absorption minimum, is 5100 km/s. Cross-correlation of the host
galaxy spectrum with an emission-line template yields a recession
velocity of 4350 +/- 20 km/s. An image of SN 1999gg, taken by A.
Bragg on Nov. 30.29 with the FLWO 1.2-m telescope (+ 4Shooter),
yields precise position end figures for the supernova: 58s.84,
19".0 (equinox 2000.0, uncertainty +/- 0".2), which is 4".7 west
and 3".3 north of the galaxy nucleus.
SUPERNOVA 1999gb IN NGC 2532
Jha, Challis, and Kirshner also report: "A spectrum of SN
1999gb (cf. IAUC 7316), obtained by Falco on Nov. 30.45 UT with the
FLWO 1.5-m telescope (+ FAST spectrograph), reveals that it is
likely a type-IIn supernova at an early epoch. The spectrum
exhibits a very blue continuum with H-alpha emission, the line
profile consisting of very narrow emission (FWHM < 300 km/s) on a
broader base (FWHM = 2800 km/s). The redshift of the host galaxy,
measured via cross-correlation with an emission-line template is
5270 +/- 15 km/s."
V1494 AQUILAE
Visual magnitude estimates: Dec. 2.95 UT, 3.7 (J. Rao,
Yonkers, NY); 3.043, 4.1 (S. Giovanardi, New York City, NY); 3.38,
4.1 (H.-l. Tao, Raohe, Heilongjiang, China); 3.46, 3.6 (W.-f.
Song, Jingzhou, China); 3.670, 4.1 (K. Hornoch, Lelekovice, Czech
Republic); 3.68, 4.0 (L. Kiss, Szeged, Hungary); 3.702, 4.3
(Hornoch).
(C) Copyright 1999 CBAT
1999 December 3 (7326) Daniel W. E. Green
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