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IAUC 8288: 2004Y; 2004F, 2004X; NO 2003lr

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IAUC number

                                                  Circular No. 8288
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Further to IAUC 8287, W. Li reports the LOSS discovery, on a
KAIT image taken on Feb. 12.5 UT, of a supernova (mag 18.5) located
at R.A. = 11h43m28s.26, Decl. = +21o40'30".3 (equinox 2000.0),
which is 0".5 east and 3".3 north of the center of the apparent
host galaxy.  A. V. Filippenko, R. Chornock, and R. J. Foley report
that inspection of CCD spectra (range 400-1000 nm), obtained on
Feb. 14 UT with the Keck II 10-m telescope (+ ESI), shows that SN
2004Y is of type Ia, roughly 3-4 weeks past maximum brightness.
The redshift of the host galaxy, measured from narrow emission
lines from H II regions close to the supernova, is 0.0692.

     Filippenko, Chornock, and Foley add that inspection of CCD
spectra, obtained on Feb. 13 UT with the Keck I 10-m telescope (+
LRIS; range 310-920 nm) and on Feb. 14 with the Keck II 10-m
telescope (+ ESI; range 400-1000 nm), reveals that SN 2004F (cf.
IAUC 8271) is a peculiar variety of type IIn, resembling SN 1994W
and SN 1994ak (see Fig. 14 in Filippenko 1997, ARAA 35, 309).  Very
narrow H_alpha emission (FWHM about 1000 km/s) is visible, and the
bottom of the corresponding P-Cyg absorption line indicates an
expansion velocity of about 800 km/s.  Narrow absorption lines
(sometimes with associated emission) of Ca II, O I, Fe II, and Na I
are also visible, and they indicate comparable expansion velocities.
W. Li reports that the object faded from maximum brightness quite
rapidly, according to KAIT photometry.
     Corrigendum.  On IAUC 8287, the offset for SN 2004X in Decl.
is 2".3 north (not south).

     Li, Filippenko, Chornock, and Foley also report that there is
no supernova 2003lr (cf. IAUC 8266) in UGC 2904.  Further
inspection of the KAIT images taken on 2003 Dec. 28.23 and 2004
Jan. 10.19 UT reveals that two different minor planets were imaged
at nearly the same location (7" positional difference):  (42805)
1999 JU_1 on Dec. 28, and (42671) 1998 HQ_68 on Jan. 10.
Remarkably, a Keck-I CCD spectrum of an object close to the
putative position of the supernova, obtained on 2004 Feb. 13.32,
revealed yet another minor planet, (23017) 1999 VQ_190.  A KAIT
image taken on Jan. 16.2 showed nothing at the position of 2003lr
(limiting mag about 19.0).

                      (C) Copyright 2004 CBAT
2004 February 15               (8288)            Daniel W. E. Green

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