Circular No. 8520

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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)
CBAT@CFA.HARVARD.EDU
(science)
URL http://cfa-www.harvard.edu/iau/cbat.htmlљ ISSN
0081-0304
Phone 617-495-7440/7244/7444 (for
emergency use only)
 
 

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SUPERNOVAE 2005bv AND 2005bw

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љљљљ Two apparent supernovae
have been found on unfiltered CCD
images.љ
SN 2005bv was reported by V. Lipunov, A. Krylov, V.
Kornilov, G. Borisov, D. Kuvshinov, A. Belinski, G.
Antipov, E.
Gorbovskoy, M. Kuznetsov, S.
Potanin,
N.
Tyurina, and V. Vladimirov,
Sternberg Astronomical Institute (MASTER
0.36-m robotic telescope;
scale 2".1/pixel).љ SN 2005bw was reported by T. Puckett and
R.
Gagliano (cf. IAUC 8515; 0.60-m automated
supernova patrol
telescope).
 
SNљљљљљ 2005 UTљљљљљ R.A.љ
(2000.0)љ Decl.љљљ
Mag.љљљљ
Offset
2005bvљ
Apr.
20.94љ 14 24 07.44љ +26
17 50.3љ 16.5љљ 11" E, 9"
S
2005bwљ
Apr.
28.25љ 13 33 29.73љ +33 02 27.8љ 17.0љљ
8".7 E, 4".8 S
 
Additional approximate magnitudes from the
respective discoverers:
SN
2005bv, 2004 May 7.92, [18.7; 2005 Apr. 28.9,
16.6-16.7.
SN
2005bw in UGC 8539, 2002 Apr. 16, [20.0; 2003 Mar. 10,
[20.0;
2005
Apr. 29.21, 17.0 (confirming image by T. Crowley, Chiefland,
FL, 0.30-m reflector).љ SN 1999cf also appeared in UGC 8539
(cf.
IAUC 7178).

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SUPERNOVAE 2005bf AND 2005bq

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љљљљ G. Folatelli, N. Morrell, M. Hamuy, and C. Contreras,
Las
Campanas Observatory, report that an
optical spectrum (range
380-920 nm) of SN 2005bq (cf. IAUC 8515),
obtained in the course of
the Carnegie Supernova Project on Apr.
19.35 UT
with the Las
Campanas 2.5-m du Pont telescope (+ WFCCD spectrograph), reveals
it
to be a type-Ic
supernova.љ The spectrum is similar to
that of SN
1983V at 38 days after maximum light,
although the Na I 589.3-nm
line is particularly strong in the case of SN
2005bq.
љљљљ
M. Hamuy,
C. Contreras, S. Gonzalez, and W.
Krzeminski,
Carnegie Supernova Project, report that the
type-Ic SN 2005bf
(cf.
IAUC
8507, 8509) is undergoing an unusual photometric
behavior,
brightening from u' = 18.69 on Apr. 7 to u'
= 17.90 on Apr. 13, and
declining to u' = 18.61 on Apr. 21, after
which it has been re-
brightening (reaching u' = 17.92 on Apr.
29).љ Similar
photometric
behaviors have been observed in the g',
r', and i' bands,
although
the dip is less pronounced at longer
wavelengths.љ On Apr.
29,
g'
=
16.91, r' = 16.71, and i' = 16.76.љ The
light curves are posted at

http://csp1.lco.cl/~cspuser1/images/OPTICAL_LIGHT_CURVES/SN05bf.html.
Additional photometric and
spectroscopic observations are urged.
 
2005 April 29љљљљљљљљљљљљљљљљљ (8520)љљљљљљљљљљљ Daniel W. E.
Green