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IAUC 7568: 2001M; 2001N; Mkn 421

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                                                  Circular No. 7568
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2001M IN NGC 3240
     A. B. Aazami and W. D. Li, University of California at
Berkeley, on behalf of LOTOSS (cf. IAUC 7514), report the discovery
with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of an
apparent supernova on unfiltered images taken on Jan. 21.4 (mag
about 17.5) and 22.4 UT (mag about 17.7).  SN 2001M is located at
R.A. = 10h24m31s.48, Decl. = -21o47'40".6 (equinox 2000.0), which
is 12".3 east and 12".7 south of the nucleus of NGC 3240.  A KAIT
image of the same field taken on Jan. 3.4 showed nothing at this
position (limiting mag about 19.0).


SUPERNOVA 2001N IN NGC 3327
     Li also reports the discovery by R. Chornock of an apparent
supernova on unfiltered KAIT images taken on Jan. 21.4 (mag about
16.3) and 22.4 UT (mag about 16.2).  SN 2001N is located at R.A. =
10h39m58s.08, Decl. = +24o05'26".0 (equinox 2000.0), which is 1".8
east and 2".7 south of the nucleus of NGC 3327.  The photometry and
astrometry of the new object were measured after subtracting a KAIT
image of the same field taken on Jan. 1.4, which showed nothing at
the position of the new object (limiting mag about 19.0).


MARKARIAN 421
     H. G. Boerst, University of Kiel; N. Goetting, University of
Hamburg; and R. Remillard, Massachusetts Institute of Technology,
report on behalf of the High-Energy Gamma-Ray Astronomy (HEGRA)
collaboration and the ASM/RXTE team:  "Following the detection of
enhanced x-ray emission from the BL Lac object Markarian 421 with
the All-Sky Monitor onboard the RXTE satellite, observations with
the stereoscopic Cherenkov telescope system and the Cherenkov
telescope CT1 of HEGRA at La Palma performed on Jan. 16-22 showed
very strong TeV activity from the source.  Above a threshold energy
of 500 GeV, diurnal integral fluxes (20-min averages) of up to 1,
4, 2, 1.5, 2.5, and 3 times that of the Crab nebula have been
measured during these consecutive nights (source at altitudes > 45
deg).  Observations at other wavelengths are strongly encouraged.
For updates on the activity of Mkn 421 and the HEGRA observation
schedule, see http://www-hegra.desy.de/mrk-421/."

                      (C) Copyright 2001 CBAT
2001 January 22                (7568)            Daniel W. E. Green

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