SN2001ba in ESO439-G018 ( 11hm38mn00.5ss -32°19'29" )
offset 15.8"E 21.8 "S magnitude 15.9
Telescope LX200 12" f/d 2.7 ST7E UAI173 Ste Clotilde REUNION ISLAND
2001/04/27.78 unflated binning 2x 60s
2001/02/19.96 unflated limiting mag 18 binning 2x 60s
confirmation image 2001/04/28.69 mag 15.9 180s
referenced image DSS UK Schmidt 1980/02/20 limiting mag 21
Circular No. 7614
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)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2001ba IN MCG -05-28-1
R. Chassagne, Ste. Clotilde, Ile de Reunion, reports the
discovery of an apparent supernova (mag about 15.9) on unfiltered
CCD images taken with a 0.3-m telescope on Apr. 27.8 and 28.7 UT.
SN 2001ba is located at R.A. = 11h38m01s.76, Decl. = -32o19'51".0
(equinox 2000.0), which is 18".7 east and 21".8 south of the
nucleus of MCG -05-28-1 (= ESO 439-G18). An image of the same
field taken on Feb. 19.9 showed nothing at this position (limiting
mag about 18).
P. Nugent and L. Wang, Lawrence Berkeley National Laboratory,
report: "A spectrum (range 400-800 nm) obtained on Apr. 30.17 UT
at the Kitt Peak 2.1-m telescope (+ GCAM) shows that SN 2001ba is a
type-Ia supernova near maximum light. Adopting the NASA/IPAC
Extragalactic Database recession velocity of 8819 km/s for the host,
we find that the minimum of the Si II feature is at a velocity of
10 900 km/s."
Dear SN watchers,
New bright SNe are discovered. IAUC 7614 reports three SN
discovery, and among them, the brightest one SN 2001bb can become
brighter than mag 16.
M. Schwartz, on behalf of LOTOSS colllaboration (Mike and KAIT),
discovered SN 2001bb on Apr 29.3 (mag about 16.5) and confirmed one
day later when SN became mag 0.2 brighter. The position is R.A. =
13h43m25s.31, Decl. = -29o48'13".1 (2000.0), which is about 16".8 west
and 1".4 south of the nucleus of the tilted spiral (SA(s)bc?) galaxy
IC 4319. There are several foreground stars on the west side of this
galaxy, so the identification needs care.
The expected maximum of the typical SN Ia on this galaxy is about
15.6, and it seems that SN 2001bb is in the rising phase. The
follow-up photometry and type-determining spectroscopy is urged.
The other two are also britht. SN 2001ba in MCG -05-28-1 (SN
location: R.A. = 11h38m01s.76, Decl. = -32o19'51".0 (2000.0), offset
19"E 22"S) is discovered on Apr 27.8 at about mag 16, and is turned
out to be of SN Ia. It seems to be at the maximum. SN 2001az in UGC
10483 (SN position: R.A. = 16h34m27s.71, Decl. = +76o01'46".8
(2000.0), offset 5" due west) is discovered on Apr 27.39 at mag 17.1.
The recession velocity of the host galaxy is unknown.
Hitoshi Yamaoka, Kyushu Univ., Japan