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IAUC 7997: 2002ha; SAX J1808.4-3658; Corrs

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IAUC number 

                                                  Circular No. 7997
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 2002ha IN NGC 6962
     J. Graham, M. Papenkova, and W. D. Li, University of
California at Berkeley, report the LOTOSS (cf. IAUC 7906) discovery
of an apparent supernova on unfiltered KAIT CCD images taken on
Oct. 21.2 (mag about 17.3) and 22.2 UT (mag about 16.7).  SN 2002ha
is located at R.A. = 20h47m18s.58, Decl. = +0 18'45".6 (equinox
2000.0), which is 6".9 west and 29".4 south of the nucleus of NGC
6962.  A KAIT image taken on Oct. 19.2 showed nothing at this
position (limiting mag about 19.0).


SAX J1808.4-3658
     M. P. Rupen, V. Dhawan, and A. J. Mioduszewski, National Radio
Astronomy Observatory; B. W. Stappers, University of Amsterdam and
Stichting Astronomisch Onderzoek in Nederland; and B. M. Gaensler,
Harvard-Smithsonian Center for Astrophysics, report the detection
of radio emission associated with the recent outburst of the
accreting millisecond pulsar SAX J1808.4-3658 (IAUC 7993):
"Observations at 8.5 GHz with the Very Large Array (VLA) on Oct.
16.05 UT show a 0.44-mJy source (7 sigma) at R.A. = 18h08m27s.60
+/- 0s.02, Decl. = -36o58'43".4 +/- 0".4 (equinox 2000.0),
consistent with the position reported by Gaensler et al. (1999,
Ap.J. 522, L117) during the source's 1998 outburst.  Data taken
with the Australia Telescope Compact Array (ATCA) on Oct.
16.07-16.36 give a 3-sigma detection of 0.4 mJy at 8.5 GHz,
suggesting that the source was not rapidly fading.  VLA and ATCA
observations at 4.9 GHz at the same epochs as above both give a
marginal detection at a flux density of 0.3 +/- 0.1 mJy, while
ATCA observations on Oct. 16.05-16.38 provide an upper limit of 0.5
mJy (3 sigma) at 2.4 GHz at the detected position.  Subsequent VLA
observations on Oct. 17.98 at 8.5 GHz give a probable detection
(based on positional agreement with the Oct. 16 data) at 0.3 mJy (4
sigma).  Further radio observations are planned; we encourage
continued optical and x-ray monitoring."


CORRIGENDA
     On IAUC 7996, 'Possible Nova in Small Magellanic Cloud', line
2, for Oct. 19.131 read Oct. 18.131
     On IAUC On IAUC 7763, 'Supernovae', line 7, for SN 2000fr,
the R.A. SHOULD READ  14h01m57s.75

                      (C) Copyright 2002 CBAT
2002 October 22                (7997)            Daniel W. E. Green

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