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IAUC 7454: EXO 1745-248 = XB 1745-25; 2000cu; C/1999 H5, 2000 M9, 2000 N1

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                                                  Circular No. 7454
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


EXO 1745-248 = XB 1745-25
     C. B. Markwardt, University of Maryland and Goddard Space Flight
Center (GSFC); and J. H. Swank, GSFC, report: "RXTE PCA scans of the
galactic bulge on July 2.73 and 6.69 UT have detected a transient
source.  The position is consistent with a reappearance of the source
EXO 1745-248 = XB 1745-25, an x-ray burster in the globular cluster Terzan 5
(cf., e.g., IAUC 3506).  The best position as observed by ROSAT was R.A. =
17h48m05s.0, Decl. = -24o46'47" (equinox 2000.0; Johnston et al. 1995,
A.Ap. 298, L21).  The RXTE observations are inconsistent with the
position of Johnston's nearby source S2 (= 1RXS 174746.0-24451; 6'.9 away)
at a high confidence level.  The 2-10-keV x-ray fluxes in the PCA
observations were 54 and 94 mCrab, indicating that the intensity is rising.
Pointed PCA observations are being scheduled; follow-up observations by
imaging instruments are encouraged."


SUPERNOVA 2000cu IN ESO 525-G004
     S. Benetti, R. M. Dominguez and A. Zacchei, Telescopio Nazionale Galileo
(TNG); E. Molinari, Osservatorio Astronomico di Brera; and E. Giro,
Osservatorio Astronomico di Padova, report: "A fully reduced CCD spectrum
(range 331.4-721.5 nm, resolution 1.2 nm), obtained on July 14.03 UT with the
TNG reflector (+ D.o.lo.res spectrograph), shows SN 2000cu (cf. IAUC
7453) to be a type-Ia supernova at maximum light.  The spectrum is
dominated by P-Cyg lines of Ca II H and K, S II and Si II ions, where
the absorption component of the Si II 597.2-nm transition is very intense
for the deduced phase."


COMETS C/1999 H5, 2000 M9, 2000 N1
     Following the item on IAUC 7453, three more Kreutz sungrazing
comets have been detected with the SOHO/LASCO coronagraphs (C2 alone for the
first, both C3 and C2 for the others).  Detections were by M. Oates
(in archival data), by M. Meyer, and by T. Lovejoy and M. Boschat,
respectively.  Discovery positions follow.  Details are on MPEC 2000-N34.

     1999 UT           R.A. (2000) Decl.       Comet
     Apr. 24.455       2 12.5      +11 43      C/1999 H5

     2000 UT           R.A. (2000) Decl.       Comet
     June 30.971       6 31.6      +20 16      C/2000 M9
     July  1.929       6 34.8      +19 24      C/2000 N1

                      (C) Copyright 2000 CBAT
2000 July 14                   (7454)              Brian G. Marsden

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