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IAUC 7621: 2001bg; CI Aql; 2001bb; C/1999 T1

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                                                  Circular No. 7621
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 2001bg IN NGC 2608
     G. M. Hurst, Basingstoke, England, reports the discovery by T.
Boles, Coddenham, of an apparent supernova (mag about 14) on an
unfiltered CCD frame (limiting mag about 18) taken on May 8.943 UT
with a 0.36-m Schmidt-Cassegrain telescope in the course of the
U.K. Nova/Supernova Patrol.  The object was near the same
brightness on a second image obtained by Boles on May 9.9 in rather
poor conditions.  The new object is located at R.A. = 8h35m18s.86,
Decl. = +28o28'05".8 (equinox 2000.0), which is 22" east and 19"
south of the center of NGC 2608.  Nothing appears at this location
on a master image taken on 2000 Jan. 13.956 (limiting mag about 19)
or on Palomar Sky Survey images taken on 1989 Nov. 8 (limiting red
mag about 20) and on 1990 Mar. 23 (limiting blue mag about 20).  SN
2001bg also appears near mag 14 on an unfiltered CCD image taken on
May 9.884 with a 0.15-m reflector by H. Kerner, Fassberg, Germany,
at the request of Hurst.

     B. E. Schaefer, University of Texas at Austin, writes:  "The
recurrent nova CI Aql displayed an eclipsing light curve with a
range in V of 14.7 to 15.3 from May 2.32 to 3.48 UT in data
obtained with the 2.1-m telescope at McDonald Observatory.  The
normal maximum during quiescence is V = 16.2, so CI Aql is still in
its plateau phase after its May 2000 outburst, during which it is
predicted to be a bright supersoft x-ray source (Hachisu and Kato,
http://xxx.lanl.gov/abs/astro-ph/0104461), in need of observations."

SUPERNOVA 2001bb IN IC 4319
     Corrigendum.  On IAUC 7620, while Chassagne's prediscovery
observation was made of SN 2001bb, the actual discovery (cf. IAUC
7614) was by the LOTOSS, not Chassagne.

     Visual m_1 estimates:  Jan. 1.28 UT, 7.9 (B. H. Granslo,
Malm, Norway, 0.07-m refractor); Feb. 18.08, 7.9 (J. Carvajal,
Avila, Spain, 10x70 binoculars); Mar. 12.88, 9.4 (R. J. Bouma,
Groningen, The Netherlands, 0.31-m reflector); Apr. 1.12, 11.3 (N.
Biver, Poigny, France, 0.26-m reflector); 28.94, 11.4 (Bouma,
0.25-m reflector).

                      (C) Copyright 2001 CBAT
2001 May 9                     (7621)            Daniel W. E. Green

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