[ Previous | Next | ADS ]

ASAS-SN Discovery of A Bright Probable Supernova in UGC 00110

ATel #6892; Subo Dong (KIAA-PKU), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 10 Jan 2015; 10:29 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

Subjects: Optical, Supernovae

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new, bright transient source, most likely a supernova, in the galaxy UGC 00110:

Object      RA (J2000)     DEC (J2000)       Disc. UT Date   Disc. V mag 
ASASSN-15ak  00:12:01.576   +26:23:37.26    2015-01-09.22    15.1

ASASSN-15ak was discovered in images obtained on UT2015-01-09.22 at V~15.1. and it is also detected on 2015-01-01.26 at V~16.8 and on 2015-01-10.23 at V~14.9. We do not detect (V>17.4) this object in images taken on UT 2014-12-27.25 and before.

See the ASAS-SN discovery image, top left panel shows the reference image, top right shows the DSS image on the same angular scale, lower left is one of the 90-sec V-band images on 01/09 and lower right is the image subtraction residual image on 01/09. Circle with the 15" radius has the same position.

The position of ASASSN-15ak is approximately 3.6" from the center of the galaxy UGC 00110 (z=0.015034, d=58 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.0 (m-M=33.8, A_V=0.12). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.