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金彰伟 XM51ZJ = SN 2015D * 超新星 II型

POSSIBLE SUPERNOVA IN NGC 5020
Zhangwei Jin(Ningbo, Zhejiang, China) and Xing Gao (Urumqi, Xinjiang, China), report the discovery of a possible supernova (mag 17.5 at discovery mag) on two 40-s survey images(limiting mag about 19.5)taken by Xing Gao in Xingming ObservationSky Survey(C42) around Jan. 18.90494 and Jan. 19.89860 UT, 2015. using an unfilted CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=350-mm @f/6.9 ).the new object approximately located at R.A. =13h 12m 41s.16 Decl.=+12°36’01”.8(equinox 2000.0). Which is about 14.5″ east and 2.7″ north of the center of  the NGC 5020.
Nothing is visible at this position on archival images taken on Dec.25,2014. (limiting mag 19.5) nor on the DSS(POSS2/UKSTU Red) from May. 07,1997(limiting mag about 19.8)
NET USNO-A2.0
XM51ZJ   C2015 01 18.90471 13 12 41.13 +12 36 01.6          17.5 V      C42
XM51ZJ   C2015 01 19.89860 13 12 41.16 +12 36 01.8          17.4 V      C42
All images can be seen from: http://www.xjltp.com/XOSS/XM51ZJ/XM51ZJ.htm
C42,Xingming Observatory, Mt. Nanshan. Observers Z.Jin, X.Gao ,Measurers Z.Jin 0.35-m f/6.9 Schmidt-Cassegrain telescope and CCD.

Electronic Telegram No. 4051

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network

SUPERNOVA 2015D IN NGC 5020 = PSN J13124116+1236018
Z.-w. Jin, Ningbo, Zhejiang, China; and X. Gao, Urumqi, Xinjiang, China,
report the discovery of an apparent supernova (mag 17.5) on two unfiltered
40-s survey CCD images (limiting mag about 19.5) taken by Gao around Jan.
18.905 and 19.899 UT (the magnitude measured as 17.4 on the second date) using
a 35-cm Celestron C14 Schmidt-Cassegrain telescope at Mt. Nanshan in the
course of the Xingming Sky Survey.  The new object is approximately located at
R.A. = 13h12m41s.16, Decl. = +12d36’01”.8 (equinox 2000.0), which is about
14″.5 east and 2″.7 north of the center of NGC 5020.  Nothing is visible at
this position on a red Digitized Sky Survey photograph from 1997 May 7
(limiting mag about 19.8) or on Xingming archival images taken on 2014 Dec.
25 (limiting mag 19.5).  The discoverers’ images have been posted at website
URL http://www.xjltp.com/XOSS/XM51ZJ/XM51ZJ.htm.  The variable was designated
PSN J13124116+1236018 when it was posted at the Central Bureau’s TOCP webpage
and is here designated SN 2015D based on the spectroscopic confirmation
reported below.  The type-II supernova 1991J also appeared in NGC 5020 (cf.
IAUC 5196).

K. Migotto, C. Fremling, A. Nyholm, F. Taddia, E. Karamehmetoglu, and J.
Sollerman, Oskar Klein Centre; N. Elias-Rosa, Osservatorio Astronomico di
Padova; L. Galbany, Universidad de Chile; C. Inserra Queen’s University,
Belfast (QUB); K. Maguire, European Southern Observatory (ESO); S. J. Smartt
and K. W. Smith, QUB; M. Sullivan, Southampton University; S. Valenti, Las
Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for
Science; D. Young, QUB; and I. Manulis, Weizmann Institute for Science, on
behalf of the Public ESO Spectroscopic Survey for Transient Objects (PESSTO;
see website URL http://www.pessto.org), report that a spectrogram of PSN
J13124116+1236018 = SN 2015D was taken with the ESO New Technology Telescope
at La Silla on Jan. 20.33 UT using EFOSC2 and Grism 13 (range 370-930 nm;
1.8-nm resolution).  Cross-correlation of the spectrum with a library of
template spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and
GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) gives a best match to the
under-luminous type-IIP supernova 2005cs at the redshift of NGC 5020 (z =
0.011), at phases around two weeks after explosion.

NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2015 CBAT
2015 January 23                  (CBET 4051)              Daniel W. E. Green

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