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IAUC 7791: 2002B; IM Nor; PECULIAR Var IN Mon

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                                                  Circular No. 7791
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)

     C. Stubbs, University of Washington, reports, on behalf of the
SuperMacho microlensing survey team (including also A. Rest, R.
Covarrubias, A. Becker, C. Smith, K. Olsen, N. Suntzeff, R. Hiriart,
D. Welch, D. Lepischak, A. Clocchiati, B. Schmidt, and K. Cook),
the detection with the Cerro Tololo 4-m telescope (+ MOSAIC II
imager) on Jan. 7.20 UT of an apparent supernova (R about 20.5) in
a galaxy behind the Large Magellanic Cloud.  The new object was not
apparent in images taken on 2001 Nov. 22 (limiting mag R about 23)
and, based on the accumulated light curve with data points from
multiple nights, appears to reach a peak magnitude of R about 20.5
on 2002 Jan. 9.2.  SN 2002B is located at R.A. = 5h40m46s.06, Decl.
= -71o51'15".1 (equinox 2000.0), which is about 2".2 west of the
host galaxy's nucleus.

     T. Kato, Kyoto University, reports that the proposed
identification of IM Nor with 2U 1536-52 (cf. IAUC 7789) is
incorrect, with QV Nor = 2U 1536-52 = 4U 1538-52 shown to be valid
(cf. IAUC 3184, 3201; Kholopov 1985, General Catalogue of Variable
Stars 2, 348).  H. Yamaoka, Kyushu University, having looked at
various Digitized Sky Survey images of the field, reports that IM
Nor may be identical with the easternmost star (having red mag
about 17.0, via comparison with nearby USNO-A2.0 stars on a red
plate, and blue mag about 18.0 from a blue plate taken on 1975 July
7) of three aligned stars.  Yamaoka adds that the star appears less
bright on a Palomar blue plate taken on 1987 Apr. 25, noting that
the object may be variable in quiescence.  W. Liller, Vina del Mar,
Chile, reports that this variable had brightened to broadband V =
7.84 on Jan. 14.3285 UT.

     C. Bailyn, Yale University, reports on YALO-consortium
observations of this variable (IAUC 7786):  "Images with the
ANDICAM instrument on the Yale 1-m telescope at Cerro Tololo taken
on Jan. 11.139 UT reveal a bright infrared source with J, H, and K
magnitudes < 7.  Preliminary reductions suggest K = 5.9, H = 6.2, J
= 6.6, but these values may be imprecise due to non-linearity
effects at these high count rates."
     Visual magnitude estimates:  Jan. 11.01 UT, 10.6 (K.
Sarneczky, Piszkesteto, Hungary); 11.616, 10.5 (A. Pearce,
Nedlands, Western Australia); 13.375, 10.4 (J. Bedient, Honolulu,
HI); 14.361, 10.3 (Bedient).

                      (C) Copyright 2002 CBAT
2002 January 14                (7791)            Daniel W. E. Green

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