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IAUC 8300: 2004ap; PSR 1259-63; C/2003 T5, C/2003 T6, C/2003 T7

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                                                  Circular No. 8300
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)

SUPERNOVA 2004ap IN PGC 29306
     Further to IAUC 8299, J. Graham and W. Li report the LOSS
discovery, on KAIT images taken on Mar. 8.31 and 9.24 UT, of an
apparent supernova (mag about 16.5) located at R.A. = 10h05m43s.81,
Decl. = +10o16'17".1 (equinox 2000.0), which is 10".5 west and
19".5 south of the nucleus of PGC 29306.  A KAIT image taken on
Feb. 10.41 showed nothing at this position (limiting mag about 19.0).

PSR 1259-63
     M. Beilicke, Universitaet Hamburg; M. Ouchrif, Laboratoire de
Physique Nucleaire de Haute Energie, Universite Paris VI and VII;
G. Rowell, Max-Planck-Institut fuer Kernphysik; and S. Schlenker,
Humboldt-Universitaet, Berlin; on behalf of the 'High Energy
Stereoscopic System Collaboration', report detection of very-high-
energy gamma-ray emission from the binary millisecond pulsar PSR
1259-63 (1236.72-day orbit) above a threshold of about 200 GeV (in
the observed zenith-angle range, 40o-45o) at the 5.9-sigma level,
where previously upper limits were reported by the CANGAROO
collaboration (Kawachi et al. 2004, Ap.J., in press).  The source
was observed for a total of 4.6 hr live-time between Feb. 26 and
Mar. 5 with the full four-telescope Cherenkov array.  Preliminary
estimates yield a flux at about 10 percent of the level of the
Crab nebula (0.4 photons/min gamma-ray excess detected after
selection cuts).  Periastron passage of the pulsar was expected on
Mar. 7.43 UT.  Observations at other wavelengths are strongly
encouraged, especially on Mar. 20-25, when the neutron star will
cross the inclined Be disk for the second time.  Particle
acceleration associated with the pulsar wind is predicted to result
in observable GeV/TeV emission also after periastron (Kirk et al.
1999, Astroparticle Phys. 10, 31).

COMETS C/2003 T5, C/2003 T6, C/2003 T7 (SOHO)
     Further to IAUC 8291, K. McGleam reports her measures of three
additional Kreutz sungrazing comets found on SOHO C3 website images
by J. Sachs.  The reduced astrometry and orbital elements by B. G.
Marsden appear on MPEC 2004-E28.

      Comet          2003 UT          R.A. (2000.0) Decl.
      C/2003 T5     Oct.  8.929       12 33.6      - 7 21
      C/2003 T6           9.471       12 42.3      - 7 37
      C/2003 T7           9.471       12 28.7      - 7 58

                      (C) Copyright 2004 CBAT
2004 March 9                   (8300)            Daniel W. E. Green

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