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IAUC 6843: 1998W; SAX J1810.8-2609; 1998S; 1998T

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IAUC number

                                                 Circular No. 6843
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     W. Li, M. Modjaz, R. R. Treffers, and A. V. Filippenko,
University of California at Berkeley, report their discovery of an
apparent supernova during the course of the Lick Observatory
Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic
Imaging Telescope.  SN 1998W was found and confirmed on unfiltered
CCD images obtained on Mar. 16.3 (mag about 17.3) and 17.2 UT (mag
about 17.4), and it is located at R.A. = 9h58m54s.83, Decl. =
+14o25'25".7 (equinox 2000.0), which is about 20" west and 12"
north of the nucleus of NGC 3075.  An image of the same field taken
on Jan. 25 (limiting mag about 18.5) shows no star at this position.

SAX J1810.8-2609
     P. Ubertini and A. Bazzano, Istituto di Astrofisica Spaziale
(IAS), CNR, Rome; J. Heise and J. in 't Zand, Space Research
Organization of the Netherlands, Utrecht; A. Antonelli, BeppoSAX
Science Operation Center, Rome; and L. Piro, IAS, report on a
BeppoSAX follow-up observation of SAX J1810.8-2609 (cf. IAUC 6838)
with the Narrow Field Instruments on Mar. 12:  "An improved
position has been obtained, corresponding to R.A. = 18h10m44s.5,
Decl. = -26o06'39" (equinox 2000.0; error radius 1'); this is 2'.5
from the previously reported position.  The average flux for the
source in the band 2-10 kev corresponds to 1.5 x 10E-10 erg cmE-2
sE-1 and photon index 2.2."

     Magnitude estimates, visual unless otherwise noted (comparison-
star magnitudes from an AAVSO sequence):  Mar. 15.814 UT, 12.29 (M.
Bignotti, Lumezzane, Italy; CCD); 15.9, 12.1 (L. Kiss, Szeged,
Hungary); 16.85, 12.2 (Kiss); 16.93, 11.8 (Carvajal); 17.146, 12.0
(C. E. Spratt, Victoria, BC); 17.22, 12.5 (D. Borgman, W. Dillon,
and K. Rivich, Damon, TX; unfiltered CCD); 17.8, 12.1 (Kiss).

     Visual magnitude estimates:  Mar. 15.795 UT, 14.3 (K. Hornoch,
Lelekovice, Czech Republic; GSC comparison stars); 15.803, 13.9 (M.
Plsek, Lelekovice, Czech Republic).

                      (C) Copyright 1998 CBAT
1998 March 18                  (6843)            Daniel W. E. Green

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