Central Bureau for Astronomical Telegrams
IAUC 7932: 2002dw; TRANSIENT X-RAY PULSARS; C/2002 C1
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Circular No. 7932
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2002dw IN UGC 11376
D. Weisz and W. D. Li, University of California, report the
LOTOSS (cf. IAUC 7906) discovery of an apparent supernova on
unfiltered KAIT images taken on July 4.3 (mag about 18.9) and 5.3
UT (mag about 19.2). SN 2002dw is located at R.A. = 18h54m15s.25,
Decl. = +48o55'37".3 (equinox 2000.0), which is 8".1 east and 3".5
south of the nucleus of UGC 11376. Another (possibly cataclysmic)
variable star (mag 19.7 on June 4.3; 19.4 on June 5.3), was found
at position end figures 06s.41, 18".5. A KAIT image taken on June
27.3 showed nothing at these two positions (limiting mag about 20.0).
TRANSIENT X-RAY PULSARS
R. Corbet, Goddard Space Flight Center (GSFC) and Universities
Space Research Association; C. B. Markwardt, GSFC and University of
Maryland; F. E. Marshall, GSFC; and S. Laycock and M. Coe,
University of Southampton, report their detection of two transient
x-ray pulsars in the direction of the Small Magellanic Cloud from
RXTE Proportional Counter Array observations having 2-degree FWZI
fields-of-view centered at R.A. = 0h50m00s, Decl. = -73o06'.0, and
R.A. = 0h53m53s, Decl. = -72o26'.7 (equinox 2000.0): "Pulsations
at 82.4 +/- 0.2 s from a previously unknown source were detected on
June 19 and 26, and pulsations at 46.4 +/- 0.1 s were detected on
June 5 and 19. Source positions were determined from four scans,
but accuracy is limited by the pulsations, which give variability
on the scan timescales. For the 82.4-s pulsar, we find R.A.(mean)
= 0h52m55s (standard deviation 2') and Decl.(mean) = -72o33'.0
(s.d. 8'), and so designate this source XTE J0052-725. The 46.4-s
pulsar's position is not near the scan centers and so is not well
determined, but it is unlikely to coincide with the apparently
inactive 46.6-s pulsar 1WGA J0053.8-7226 (IAUC 6788, 6789). The
intensity of XTE J0052-725 was approximately 1.5 mCrab (2-10 keV)
in all observations. The 46.4-s pulsar's collimator-response-
corrected intensity was poorly determined but was similar to that
of XTE J0052-725 on June 19."
COMET C/2002 C1 (IKEYA-ZHANG)
Total visual magnitude estimates: May 21.08 UT, 5.4 (J.
Bortle, Stormville, NY, 10x50 binoculars); 31.96, 5.9 (M. V.
Zanotta, Monte Tellero, Italy, 7x42 binoculars); June 8.54, 6.7
(D. A. J. Seargent, The Entrance, N.S.W., 10x50 binoculars); 17.11,
7.1 (Bortle); 28.94, 8.4 (J. J. Gonzalez, Asturias, Spain, 11x80
binoculars); July 4.87, 8.9 (K. Hornoch, Lelekovice, Czech
Republic, 10x80 binoculars).
(C) Copyright 2002 CBAT
2002 July 5 (7932) Daniel W. E. Green
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