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IAUC 8063: 2003aa; 2003Y, 2003Z; IGR J16318-4848

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IAUC number

                                                  Circular No. 8063
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2003aa IN NGC 3367
     Further to IAUC 8061, B. Swift, H. Pugh, and W. Li report the
LOTOSS discovery of an apparent supernova (mag about 17.6) on
unfiltered KAIT images taken on Jan. 31.4 and Feb. 1.4 UT.  SN
2003aa is located at R.A. = 10h46m36s.82, Decl. = +13o45'32".2
(equinox 2000.0), which is 26".4 east and 30".2 north of the
nucleus of NGC 3367.  A KAIT image taken on Jan. 24.4 showed
nothing at this position (limiting mag about 18.5).

     T. Matheson, P. Challis, and R. Kirshner, Center for
Astrophysics, report that a spectrum (range 370-750 nm) of SN 2003Y
(cf. IAUC 8062), obtained by M. Calkins on Jan. 31.34 UT with the
Mt. Hopkins 1.5-m telescope (+ FAST spectrograph), shows it to be a
type-Ia supernova near maximum.  Several titanium features appear
stronger than normal, indicating that this may be a subluminous
event.  Adopting the NASA/IPAC Extragalactic Database (NED)
recession velocity of 5079 km/s for the host galaxy, the supernova
expansion velocity is 10400 km/s for Si II (rest 635.5 nm).  A
spectrogram of SN 2003Z (cf. IAUC 8062), obtained on Jan. 31.36,
shows it to be a type-II supernova.  The spectrum consists of a
very blue continuum with well-defined P-Cyg lines of hydrogen and
helium.  Adopting the NED recession velocity of 1289 km/s for the
host galaxy, the expansion velocity derived from the minimum of the
H_beta line is 6800 km/s.

IGR J16318-4848
     T. J.-L. Courvoisier, INTEGRAL Science Data Centre (ISDC),
Versoix, writes that R. Walter, ISDC; J. Rodriguez, Centre d'Etude
Atomique and Service d'Astrophysique, Saclay; L. Bouchet, Centre
d'Etude Spatial du Rayonnement, Toulouse; and A. A. Lutovinov,
Space Research Institute, Russian Academy of Sciences, Moscow,
report the detection of the first transient source observed by the
ISGRI detector of the IBIS instrument onboard the European Space
Agency's INTEGRAL satellite.  The source appeared at R.A. =
16h31m52s, Decl. = -48o48'.5 (equinox 2000.0; uncertainty about 2'),
while INTEGRAL was performing an observation of the Galactic plane
on Jan. 29.271 UT.  The source flux in the band 15-40 keV was
50-100 mCrab.  The source was observed to vary significantly on a
timescale of 1000 s.  INTEGRAL will observe the source again during
Feb. 1-3.  Observations at other wavelengths are encouraged.

                      (C) Copyright 2003 CBAT
2003 February 1                (8063)            Daniel W. E. Green

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