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IAUC 8168: 2003gn, 2003go, 2003gp, 2003gq; XTE J1810-197

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                                                  Circular No. 8168
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVAE 2003gn, 2003go, 2003gp, 2003gq
     Four additional apparent supernovae have been found on
unfiltered CCD images, each by LOTOSS/KAIT (via J. Graham, D. Weisz,
and W. Li; cf. IAUC 8162), with SN 2003gq reported initially by T.
Puckett and A. Langoussis (cf. IAUC 8154; Puckett's data for SN
2003gq tabulated below).  Li provides position end figures 20s.74,
57".6 for SN 2003gq.

SN      2003 UT       R.A.  (2000.0)  Decl.   Mag.     Offset
2003gn  July 22.4   22 33 51.68  +20 48 08.5  18.4  16".4 E, 11".0 S
2003go  July 22.3   19 52 47.68  -19 11 28.2  18.6  4".8 E, 0".7 S
2003gp  July 23.2   16 03 55.47  +25 00 24.8  18.6  12".9 E, 12".0 S
2003gq  July 24.32  22 53 20.68  +32 07 57.6  17.6  5".0 W, 11".3 N

Additional approximate magnitudes, from KAIT unless otherwise noted:
SN 2003gn, July 10.4 UT, [19.0; 17.4, [18.0; 23.4, 18.1.  SN 2003go,
July 17.3, [19.0; 23.3, 18.6.  2003gp in UGC 10160, July 16.2, [19.0;
25.2, 18.6.  SN 2003gq in NGC 7407, July 8, [20.0 (Puckett); 16.4,
19.0; 25.22, 17.7 (M. Marcus and Puckett); 25.4, 17.6; 26.4, 17.5.


XTE J1810-197
     C. B. Markwardt, University of Maryland and Goddard Space
Flight Center (GSFC); A. I. Ibrahim, GSFC and George Washington
University; and J. H. Swank, GSFC, report that, following reports
from the IPN and HETE of renewed bursting activity by the soft
gamma-ray repeater SGR 1806-20 (GCN 2297, 2308), an RXTE PCA
pointed observation was undertaken that revealed unexpected x-ray
pulsations at a period of 5.54 s in the PCA field-of-view (GCN
2306).  An RXTE PCA scanning observation on July 18.23-18.27 UT
showed a new source at R.A. = 18h10m.9, Decl. = -19o42' (equinox
2000.0), with estimated 99-percent-confidence semi-major axes of 5'
in R.A. and 7' in Decl.; this confidence region excludes both the
reported IPN burst annuli and the HETE burst error region, and is
not consistent with any other known pulsar.  The pulsations are
clearly from this source, designated XTE J1810-197.  The fitted
flux was 2.5 +/- 0.2 mCrab (2-10 keV).  On hindsight, XTE J1810-197
has been detectable in RXTE PCA galactic-bulge scans since Feb. 7
(but not before), and it is steadily declining from a maximum of
3.6 mCrab.  Follow-up observations are encouraged.

                      (C) Copyright 2003 CBAT
2003 July 27                   (8168)            Daniel W. E. Green

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