Central Bureau for Astronomical Telegrams

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IAUC 7247: 1999dp; 1999dq; SAX J1712.6-3739

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                                                  Circular No. 7247
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)


SUPERNOVA 1999dp IN UGC 3046
     W. D. Li, University of California at Berkeley, on behalf of
the Lick Observatory Supernova Search (LOSS; cf. IAUC 6627, 7126),
reports the discovery with the 0.8-m Katzman Automatic Imaging
Telescope (KAIT), of an apparent supernova in UGC 3046.  SN 1999dp
was discovered on an unfiltered image taken on Sept. 2.5 UT and was
confirmed on earlier images taken on Aug. 18.5, 25.5, and 28.5, all
showing the star at mag about 18.2. The new object is located at
R.A. = 4h29m16s.66, Decl. = +69o32'00".6 (equinox 2000.0), which is
18".0 west and 7".8 north of the nucleus of UGC 3046.  There is a
nearby star (mag about 16.5) with position end figures 15s.87,
02".4.  A KAIT image of the same field on 1998 Aug. 31.5 (limiting
magnitude about 19.5) showed nothing at the position of SN 1999dp.


SUPERNOVA 1999dq IN NGC 976
     Li also reports the discovery by the LOSS of an apparent
supernova in NGC 976.  SN 1999dq was discovered and confirmed on
unfiltered images taken on Sept. 2.5 (mag about 16.3) and 3.4 UT
(mag about 16.0).  The new object is located at R.A. = 2h33m59s.68,
Decl. = +20o58'30".4 (equinox 2000.0), which is 4".3 west and 6".4
south of the nucleus of NGC 976.  KAIT images of the same field on
Aug. 27.5 (limiting mag about 17.0) and 24.5 (limiting mag about
19.0) showed nothing at the position of SN 1999dq.


SAX J1712.6-3739
     M. Cocchi and L. Natalucci, Istituto di Astrofisica Spaziale,
CNR, Rome; J. in 't Zand and J. Heise, Space Research Organization
Netherlands (SRON), Utrecht; J. M. Muller, BeppoSAX, Rome, and
SRON; and G. Celidonio and L. Di Ciolo, BeppoSAX, Rome, communicate:
"During an observation with Wide Field Camera 2 onboard BeppoSAX on
Sept. 1.68-3.16 UT, an about 20-s long x-ray burst was detected on
Sept. 2.87 from a position 1'.9 away from SAX J1712.6-3739 (IAUC
7243).  The 99-percent-confidence error radius is 3'.5.  The peak
flux on a time scale of 1 s is 1.7 Crab units (2-26 keV).  This
burst and its time profile (fast rise and exponential decay)
suggest that SAX J1712.6-3739 is a low-mass x-ray binary with a
neutron star as the compact object.  No steady emission was
detected above an upper limit of 7 mCrab over the whole observation.
During an observation with the narrow-field instruments of BeppoSAX
on Aug. 27.43-27.95, the flux was 6 mCrabs (2-10 keV)."

                      (C) Copyright 1999 CBAT
1999 September 3               (7247)            Daniel W. E. Green

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