Electronic Telegram No. 3861
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 2014as IN NGC 5410 = PSN J14005449+4058596
     D. Grennan, Dublin, Ireland, reports the discovery of an apparent
supernova (mag 17.3) on an unfiltered CCD image taken on Apr. 18.921 UT with a
0.35-m reflector (limiting mag 19.2) at his Raheny Observatory.  The new
object is located at R.A. = 14h00m54s.49, Decl. = +40o58'59".6 (equinox
2000.0), which is approximately 0".2 west and 12".6 south of the published
coordinates of the galaxy NGC 5410.  Nothing is present at this position on
Digitized Sky Survey plates (limiting red mag 20.5 and limiting blue mag
21.0).  The variable was designated PSN J14005449+4058596 when it was posted
at the Central Bureau's TOCP webpage and is here designated SN 2014as based on
the spectroscopic confirmation reported below.  Additional approximate CCD
magnitudes for 2014as (unfiltered unless noted otherwise):  Mar. 9, [19.3
(Grennan); Apr. 10.4, [18.3 (W. Zheng, KAIT telescope, Lick Observatory; R
magnitude); 14.392, [17.5 (Zheng); 16.425, 17.3 (Zheng; marginal detection at
about a 3-sigma level); 19.013, 17.1 (Albert White, Dalkey, Ireland; 0.23-m
Schmidt-Cassegrain telescope; position end figures 54s.50, 59'00".1); 19.148,
17.0 (S. Howerton, Arkansas City, KS, U.S.A.; 0.28-m f/5 reflector; image
posted at URL https://www.flickr.com/photos/watchingthesky/13931569244/);
19.894, R_c = 16.0 (Denis Buczynski, Portmahomack, U.K.; Celestron C14
telescope + ST9XE + Cousins R filter; position end figures 54s.49, 59'00".7);
19.928, 17.2 (Grennan; position end figures 54s.59, 58'59".9); 19.993, 16.8
Federica Luppi and Luca Buzzi, Varese, Italy; 0.60-m f/4.6 reflector;
position end figures 54s.51, 59".8; reference stars from CMC-14 catalogue;
image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_N5410.jpg); 21.276,
17.6 (J. Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope
+ STXL-6303 camera at the New Mexico Skies observatory near Mayhill, NM,
U.S.A.; position end figures 54s.51, 58'59".7; image posted at website URL
https://www.flickr.com/photos/43846774@N02/13968010794/); 21.808, 16.5 (G.
Masi, Francesca Nocentini, and Patrick Schmeer; remotely with a 43-cm
telescope near Ceccano, Italy; position end figures 54s.49, 59".8).

     J.-J. Zhang, Yunnan Astronomical Observatory (YNAO); and X.-F. Wang,
Tsinghua University, report on an optical spectrogram (range 350-890 nm) of
PSN J14005449+4058596 = SN 2014as that was obtained on Apr. 19.73 UT with the
2.4-m telescope (+ YFOSC) at the LiJiang Gaomeigu Station of YNAO.  The
spectrum is consistent with a broad-lined type-Ic supernova a few days before
maximum light.  Cross-correlation with a library of supernova spectra using
the GELATO software (Harutyunyan et al. 2008, A.Ap., 488, 383) shows that
2014as matches with SN 2006aj at -5 days.  The spectrum is superimposed by
some narrow emission lines of H and O [III], likely due to light
contamination from a nearby H II region.


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

                         (C) Copyright 2014 CBAT
2014 April 26                    (CBET 3861)              Daniel W. E. Green