Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7119: SAX J1819.3-2525; C/1999 A1

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 7118 SEARCH Read IAUC 7120

View IAUC 7119 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 7119
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SAX J1819.3-2525
     J. in 't Zand and J. Heise, Space Research Organization of the
Netherlands (SRON), Utrecht; A. Bazzano and M. Cocchi, Istituto di
Astrofisica Spaziale, CNR, Rome; L. Di Ciolo, BeppoSAX Science
Operations Center; and J. M. Muller, BeppoSAX Science Data Center,
Rome, and SRON, communicate:  "During an observation of the
Galactic-center field on Feb. 20.59-22.06 UT, the Wide Field
Cameras onboard BeppoSAX detected the new flaring transient SAX
J1819.3-2525, located at R.A. = 18h19m20s, Decl. = -25o24'.9
(equinox 2000.0; 99-percent confidence error radius 2').  The
source was detected above the detection threshold during the first
two hours and peaked to a level of about 80 mCrab (2-10 keV) during
Feb. 20.647-20.675.  After that, the source flux remained below an
upper limit of about 10 mCrab.  No x-ray bursts were detected from
the source during 15 hr of effective exposure.  The centroid is
1'.0 from the variable late-type star GM Sgr, which we propose as a
candidate optical counterpart of the x-ray source.  A follow-up
observation with the BeppoSAX narrow-field instruments is scheduled
for Mar. 6."


COMET C/1999 A1 (TILBROOK)
     Ephemeris extension to IAUC 7085 (elements MPC 33858):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Mar.  3    22 56.19   -50 16.1   1.410   0.966   43.2   44.6   12.1
     13    22 43.16   -51 00.7   1.452   1.094   48.9   43.1   12.6
     23    22 29.70   -51 50.9   1.459   1.231   56.5   42.4   13.0
Apr.  2    22 13.92   -52 58.7   1.438   1.372   65.7   41.6   13.3
     12    21 53.27   -54 28.9   1.396   1.514   76.3   40.0   13.6
     22    21 24.31   -56 16.8   1.345   1.655   88.3   37.4   13.8
May   2    20 43.03   -57 59.3   1.294   1.795  101.8   33.3   14.0
     12    19 47.48   -58 47.6   1.260   1.934  116.4   27.9   14.2
     22    18 42.92   -57 39.0   1.255   2.070  131.5   21.5   14.4
June  1    17 42.54   -54 08.4   1.294   2.205  145.3   15.2   14.6
     11    16 56.22   -49 01.1   1.383   2.337  153.8   11.1   15.0
     21    16 24.91   -43 29.6   1.521   2.467  152.5   11.0   15.4

     Visual m_1 estimates:  Feb. 2.44 UT, 10.6 (D. A. J. Seargent,
Cowra, N.S.W., 0.25-m reflector); 4.44, 10.6 (Seargent); 8.42, 10.3
(S. T. Rae, Te Awamutu, New Zealand, 0.11-m reflector); 12.40, 10.1
(Rae); 17.51, 11.3, 1'.5 (A. Pearce, Dowerin, W. Australia, 0.41-m
reflector).

                      (C) Copyright 1999 CBAT
1999 March 3                   (7119)            Daniel W. E. Green

Read IAUC 7118 SEARCH Read IAUC 7120

View IAUC 7119 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!