Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6846: Poss. N IN Sgr; SAX J1747.0-2853, GX +0.2-0.2; 1998S

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 6845 SEARCH Read IAUC 6847

View IAUC 6846 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 6846
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)


POSSIBLE NOVA IN SAGITTARIUS
     W. Liller, Vina del Mar, Chile, reports his discovery of an
apparent nova (mag 7.8) on Technical Pan photographs taken with
PROBLICOM on Mar. 22.3628, 22.3642, and 22.3663 UT with an 85-mm
camera lens (+ orange filter).  The star is located at R.A. =
18h21m.6, Decl. = -27o32' (equinox 2000.0).  Nothing brighter than
mag 11.5 appears at this location on two photographs taken on Mar.
18.35.  On Mar. 23.316, the CCD magnitude was measured by Liller as
V = 7.74.  A low-resolution spectrogram obtained with a 0.20-m
Schmidt camera (+ objective prism + CCD) on Mar. 23 shows H-alpha
in emission at a level about 1.5 times brighter than the
surrounding continuum.


SAX J1747.0-2853 AND GX +0.2-0.2
     J. in 't Zand, Space Research Organization of the Netherlands
(SRON), Utrecht; A. Bazzano, M. Cocchi, and P. Ubertini, Istituto
di Astrofisica Spaziale, CNR, Rome; J. M. Muller, BeppoSAX Science
Data Center, Rome, and SRON; and V. Torroni, BeppoSAX Science
Operation Center, Rome, communicate:  ''A transient, bursting x-ray
source was detected in an observation of the Galactic bulge with
the Wide Field Camera 2 onboard BeppoSAX between Mar. 20.3 and 22.1
UT.  This object, designated SAX J1747.0-2853, is at R.A. =
17h47m02s, Decl. = -28o53'.0 (equinox 2000.0; preliminary error
radius 3'), and the position is 0'.3 from the centroid position of
GX +0.2-0.2, a transient last seen in 1976 (Proctor et al. 1978,
MNRAS 185, 745).  This supports the identification of SAX
J1747.0-2853 with GX +0.2-0.2.  However, we regard the probability
for chance coincidence to be not negligible so close to the Galactic
center (19').  No other accurately positioned catalogued x-ray
source is in the error box.  The average intensities are 8 mCrab
over 2-9 keV and 18 mCrab over 9-25 keV.  A burst was detected
coincident with the position on Mar. 21.51, with a peak intensity
of about 1 Crab (2-9 keV) and a duration of 15 s.  GX +0.2-0.2 is
not known to be a burster."


SUPERNOVA 1998S IN NGC 3877
     Visual magnitude estimates:  Mar. 18.021 UT, 11.9 (B. H.
Granslo, Fjellhamar, Norway); 18.99, 12.0 (J. Shanklin, Cambridge,
England); 19.93, 11.8 (J. Carvajal, Madrid, Spain); 20.93, 11.7
(Carvajal); 21.77, 12.1 (K. Hornoch, Lelekovice, Czech Republic);
22.77, 12.1 (Hornoch).

                      (C) Copyright 1998 CBAT
1998 March 23                  (6846)            Daniel W. E. Green

Read IAUC 6845 SEARCH Read IAUC 6847

View IAUC 6846 in .dvi or .ps format.

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

Valid HTML 4.01!