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IAUC 6819: SNe; 4U 1608-52

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                                                 Circular No. 6819
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
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVAE
     P. Garnavich, Harvard-Smithsonian Center for Astrophysics
(CfA), reports that the High-Z Supernova Search Team (IAUC 6160,
6646) has discovered nine supernovae on CCD images taken with the
Cerro Tololo Interamerican Observatory (CTIO) 4-m telescope by R.
Schommer (CTIO), B. Schmidt (Mount Stromlo and Siding Springs
Observatory), and S. Jha and P. Challis (CfA).  The supernovae were
identified by subtracting images taken on 1997 Dec. 29-30 UT from
those obtained on 1998 Jan. 23-24.  The candidates were confirmed
with spectra and images taken on Jan. 25-26 and Feb. 1 with the
Keck-2 telescope by A. V. Filippenko, A. G. Riess, and D. C.
Leonard (University of California, Berkeley).

SN      1998 UT       R.A.  (2000)  Decl.      I      z    type
1998F   Jan. 23    04 16 50.13  -05 44 59.6   24.5   0.52    ?
1998G   Jan. 23    08 03 37.02  +06 10 13.9   22.8   0.30   II?
1998H   Jan. 23    08 04 51.47  +05 36 39.3   23     0.66    ?
1998I   Jan. 23    08 04 51.56  +05 15 47.7   23.6   0.89   Ia
1998J   Jan. 23    09 31 10.48  -04 45 36.5   23.5   0.83   Ia
1998K   Jan. 24    04 13 42.86  -05 50 45.2   23.8    ?      ?
1998L   Jan. 24    11 33 36.63  +04 35 04.6   23.6    ?     II?
1998M   Jan. 24    11 33 44.37  +04 05 13.4   23.3   0.63   Ia
1998N   Jan. 24    11 33 29.39  +03 51 12.5   23.1   0.26    ?

Each supernova is within 2" of its host galaxy's center.  A
foreground galaxy with z = 0.02 is centered 2".5 southeast of SN
1998M.  Finder charts may be requested by sending e-mail to
pgarnavich@cfa.harvard.edu.


4U 1608-52
     W. Cui, Center for Space Research, Massachusetts Institute of
Technology; and J. Swank, Goddard Space Flight Center, report on
behalf of the ASM team at MIT and RXTE Science Operation Facility:
"The real-time ASM lightcurve indicates that 4U 1608-52, a
recurrent soft x-ray transient source, started an x-ray outburst on
Jan. 29.  Rough daily-averaged 1.3-12-keV fluxes:  Jan. 29, 25
mCrab; 31, 21; Feb. 1, 28; 2, 121; 3, 261; 4, 491.  A pointed
observation was carried out with the PCA and HEXTE detectors aboard
RXTE on Feb. 3.82 UT, and the measured flux was consistent with the
ASM results.  More pointed RXTE observations have been planned.
Observations at other wavelengths are encouraged."

                      (C) Copyright 1998 CBAT
1998 February 5                (6819)            Daniel W. E. Green

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