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IAUC 7602: 2001af; 2001X; V445 Pup; 1998 SF_36

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                                                  Circular No. 7602
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
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SUPERNOVA 2001af IN MCG -04-24-1
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2001af (cf. IAUC 7598), obtained by K. Rines on Mar. 23.21 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-II supernova.  The spectrum consists of a
blue continuum with incipient P-Cyg lines of hydrogen and helium.

     A. Gal-Yam and O. Shemmer, Tel Aviv University, write:  "A
spectrum (range 400-780 nm) of SN 2001X (cf. IAUC 7591, 7593) was
obtained using the Wise Observatory 1-m telescope (+ FOSC
spectrograph) on Mar. 22 by J. Dann.  SN 2001X displays strong
hydrogen Balmer lines, and the H-alpha line has a pronounced P-Cyg
profile, similar to spectra of type-IIp supernova such as 1992H,
several weeks past maximum light."

     P. Garnavich and J. Quinn, University of Notre Dame, report
that time-resolved U-band photometry of this peculiar eruptive
variable was obtained with the Vatican Advanced Technology
Telescope on Mar. 16, 17, and 19 UT for two hours each night.  The
average time between consecutive exposures was 60 s.  Contrary to
the quiescence noted in January (IAUC 7565), the object showed
significant variability in the ultraviolet.  The star brightened at
a rate of 0.16 mag/day over the observing run and showed 10-percent
variations on individual nights.  No periodicity is evident in the
light curve.  An additional set of images obtained at the Fred L.
Whipple Observatory by J. Graves and P. Berlind on Mar. 26.1 shows
the ultraviolet magnitude back to its Mar. 17 level of U = 10.2.
Further monitoring at all wavelengths is encouraged.
     Visual magnitude estimates:  Feb. 20.403 UT, 9.8 (J. Bedient,
Honolulu, HI); 27.559, 10.2 (A. Pearce, Nedlands, W. Australia);
Mar. 6.783, 10.3 (M. Lehky, Hradec Kralove, Czech Republic); 14.361,
9.6 (M. Linnolt, Honolulu, HI); 19.271, 9.9 (Bedient).

1998 SF_36
     Corrigendum.  On IAUC 7598, item by Hicks et al., line 6, for
(V-X = +0.19 +/- 0.003)  read  (V-X = +0.019 +/- 0.003)

                      (C) Copyright 2001 CBAT
2001 March 27                  (7602)            Daniel W. E. Green

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