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IAUC 8113: Prob. N IN Sgr; 2003dg; XTE J1807-294

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                                                  Circular No. 8113
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)


PROBABLE NOVA IN SAGITTARIUS
     S. Nakano, Sumoto, Japan, reports the discovery by Hideo
Nishimura (Kakegawa, Shizuoka-ken) of a possible nova (mag 9.8) on
a T-Max 400 film taken on Apr. 8.792 UT with a 200-mm f/4 camera
lens.  Nishimura reported the object at R.A. approximately
18h07m19s, Decl. approximately -27o24'20" (equinox 2000.0), and he
provided the following magnitudes from other films:  Mar. 25.81,
[11; 27.81, 10.9; 30.80, [11-12; Apr. 5.80, 10.4.  R. Kushida,
Yatsugatake South Base Observatory, reports that an unfiltered CCD
frame taken on Apr. 9.704 shows the object at mag 7.6 and yields
the following position end figures (measured by Y. Kushida):
20s.38, 31".6.  She adds that nothing appears at this position
brighter than mag 18-19 on the Digitized Sky Survey (two stars of
mag 19-20 appear near the position).


SUPERNOVA 2003dg IN UGC 6934
     Further to IAUC 8101, H. Pugh and W. Li report the LOTOSS
discovery of an apparent supernova on unfiltered KAIT images on
Apr. 8.4 (mag about 19.3) and 9.4 UT (mag about 19.1).  The new
object is located at R.A. = 11h57m31s.97, Decl. = -1 15'13".6
(equinox 2000.0), which is 2".7 east and 3".1 south of the nucleus
of UGC 6934.  A KAIT image taken on Mar. 24.4 showed nothing at
this position (limiting mag about 20.0).


XTE J1807-294
     S. Campana and M. Ravasio, Osservatorio Astronomico di Brera;
and G. L. Israel and V. Mangano, Osservatorio Astronomico di Roma,
report:  "XMM-Newton observed the fourth millisecond pulsar XTE
J1807-294 (IAUC 8080) during Mar. 22.581-22.778 UT.  The source
position is consistent with that determined with Chandra (IAUC
8095).  The 0.5-10-keV x-ray countrate measured with EPIC-pn (in
timing mode) was approximately 34.2 +/- 0.1 count/s.  No x-ray
bursts were detected.  Pulsations at 5.2459996(4) ms were detected
with a pulsed fraction of 1.9 +/- 0.3 percent (90-percent
confidence level) in the band 0.5-10 keV.  The orbital modulation
instead was barely visible (probably due to the short exposure).
No prominent emission or absorption lines are present in the RGS
spectra.  Analysis of the EPIC-MOS1 (full-frame mode) and EPIC-pn
(timing mode) provided an absorbed (0.5-10 keV) source flux of 2 x
10**-10 erg cm**-2 s**-1.  The source is still bright, and optical
and infrared observations are encouraged in order to identify the
optical counterpart."

                      (C) Copyright 2003 CBAT
2003 April 9                   (8113)            Daniel W. E. Green

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