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IAUC 7041: 1998em; 1ES 2005-489; N Sco 1998

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                                                 Circular No. 7041
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)


SUPERNOVA 1998em IN IC 4837A
     J. Maza, Department of Astronomy, University of Chile, reports
the discovery of a supernova (B about 16.5) by Roberto Antezana on
a T-Max 400 film taken by L. E. Gonzalez with the Maksutov
telescope at Cerro El Roble on Oct. 26.96 UT.  SN 1998em is located
at R.A. = 19h15m12s.69, Decl. = -54o06'49".7 (equinox 2000.0),
which is 26" west and 67" north of the spiral galaxy IC 4837A.  The
new object is not present on a film taken on Oct. 13.96 (B > 19).
SN 1998em was confirmed on direct CCD images taken by I. Perez on
Oct. 27.95 using the 1.0-m Swope telescope at Las Campanas
Observatory.  A spectrum was obtained by W. Kunkel, Carnegie
Institution of Washington (CIW), using the du Pont telescope (+
Modular Spectrograph) at Las Campanas.  M. Phillips, CIW, reports:
"The spectrum of the supernova exhibits strong, broad Si II
635.5-nm absorption consistent with a type-Ia event at maximum, or
perhaps a few days before.  Narrow Galactic interstellar Na I D
lines with a combined equivalent width of 0.054 nm are observed
near zero velocity.  A second set of Na I D absorption lines with
an equivalent width of 0.11 nm and presumably due to gas in the
host galaxy IC 4837A is present at a redshift of 0.0091."


1ES 2005-489
     R. Remillard reports for the ASM instrument teams at the
Massachusetts Insitute of Technology and Goddard Space Flight
Center: "The RXTE All Sky Monitor has detected increased x-ray flux
from the BL Lac object 1ES 2005-489 = PKS 2005-489 (R.A. =
20h09m25s.39, Decl. = -48o49'53".8, equinox 2000.0).  During the
interval Oct. 11-28, the flux has been in the range of 4 to 10
mCrab at 2-12 keV, which is a factor of 2-3 above its typical
intensity during 1996-1998.  Observations at other wavelengths are
strongly encouraged."


NOVA SCORPII 1998
     W. Liller, Vina del Mar, Chile, reports the following
magnitudes for N Sco 1998 as measured with a broadband-V system
(CCD + minus-infrared filter).  Note that the first magnitude has
been revised slightly from what appeared on IAUC 7037:  Oct.
23.0029 UT, 7.71; 23.9983, 8.08; 25.0006, 8.34; 25.9993, 8.45.
     Additional visual magnitude estimates by W. G. Dillon,
Missouri City, TX:  Oct. 25.05 UT, 9.2; 26.03, 9.4; 27.03, 9.6.

                      (C) Copyright 1998 CBAT
1998 October 28                (7041)            Daniel W. E. Green

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