Central Bureau for Astronomical Telegrams
IAUC 6873: 1998ao, 1998ap; SAX J1747.0-2853
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Circular No. 6873
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 1998ao AND 1998ap IN ANONYMOUS GALAXIES
J. Maza, Department of Astronomy, University of Chile, reports
the discovery of two supernovae by Roberto Antezana on a T-Max 400
films taken by L. E. Gonzalez with the Maksutov telescope at Cerro
El Roble. SN 1998ao (B about 18) was found on a film taken on Mar.
25.07 UT, and it is located at R.A. = 10h07m14s.58, Decl. =
-26o23'35".1 (equinox 2000.0), which is 9".7 east and 3".7 south of
the center of the host galaxy. The object was confirmed by R.
Covarrubias at Cerro Tololo using the 0.91-m telescope on Mar. 28,
and it is not present (B > 20) on a film obtained on Feb. 25. A
spectrum of SN 1998ao was obtained by J. Maza on Apr. 2.15 at Cerro
Tololo using the Blanco 4-m telescope; M. Phillips classified the
spectrum as a normal type-II supernova, younger than 10 days after
maximum (the redshift of the parent galaxy is z = 0.01557). SN
1998ap (B about 17) was found on a film taken on Mar. 31.385, and
it is located at R.A. = 20h00m35s.58, Decl. = -52o42'36".8 (equinox
2000.0), which is 16".2 west and 2".9 north of the center of the
host galaxy. SN 1998ap was confirmed by J. Maza on Apr. 3.8 at
Cerro Tololo with the Blanco 4-m telescope; a spectrum shows narrow
hydrogen lines (FWHM about 1000 km/s) at a redshift of z = 0.04146
superimposed on a blue featureless continuum. The object is not
present on a film obtained with the same telescope on 1997 Oct. 7.
SAX J1747.0-2853
A. Bazzano and P. Ubertini, Istituto di Astrofisica Spaziale,
CNR, Rome; J. in 't Zand and J. Heise, Space Research Organization
of the Netherlands (SRON), Utrecht; D. Ricci and L. A. Antonelli,
BeppoSAX Science Data Center, Rome; and M. J. S. Smith, BeppoSAX
Science Operation Centre, Rome, and SRON, report on a BeppoSAX
follow-up observation of SAX J1747.0-2853 (cf. IAUC 6846) with the
Narrow Field Instruments on Mar. 23: "An improved position has
been obtained, corresponding to R.A. = 17h47m02s, Decl. = -28o52'.5
(equinox 2000.0; error radius 1'); this is 0'.5 from the previously
reported position and 0'.8 from the centroid position of the 1976
transient GX +0.2-0.2 (Proctor et al. 1978, MNRAS 185, 745). The
source shows strong absorption, corresponding to a hydrogen column
density of about 7 x 10E22 cmE-2 and an average flux of 5.0 x
10E-10 erg cmE-2 sE-1 in the band 2-10 keV. Since Mar. 23, the
source was monitored with the Wide Field Camera 1 and has shown
repeated bursting activity; a persistent emission corresponding to
7 mCrab in the range 2-9 keV was detected on Apr. 3 and 4."
(C) Copyright 1998 CBAT
1998 April 9 (6873) Daniel W. E. Green
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