ASASSN-16dp: Discovery of A Probable Supernova in SDSS J145942.12+040518.1

ATel #8892; Subo Dong (KIAA-PKU), K. Z. Stanek, J. S. Brown, T. W.-S. Holoien, C. S. Kochanek, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 1 Apr 2016; 09:05 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

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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 transient source, most likely a supernova, in the galaxy SDSS J145942.12+040518.1.

ASASSN-16dp (AT 2016bli) was discovered in images obtained on UT 2016-03-31.47 at V~16.8 mag. We also detect the object in images taken on UT 2016-03-30.52 at V~16.7 and do not detect (V>17.1) the object in images taken on UT 2016-03-20.46 and before. An image obtained on UT 2016-04-01 with the LCOGT 1-m robotic telescope at CTIO confirms the discovery of the transient. This figure shows the SDSS g-band archival image (left) and the LCOGT confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the discovery image.

The position of ASASSN-16dp is approximately 10" from the center of the galaxy SDSS J145942.12+040518.1 (z = 0.032641, d=137 Mpc from NED), giving an absolute V-band magnitude of approximately -19.0 (m-M=35.68, A_V=0.134). Properties of the new source and photometry are summarized in the tables below:

  
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (")  
ASASSN-16dp  14:59:42.13  +04:05:08.09      2016-03-31.47      16.8          -19.0               10  

  
Obs. UT Date         V mag  
2016-03-20.46        >17.1        
2016-03-30.52         16.7        
2016-03-31.47         16.8          

Follow-up observations are encouraged.

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-16xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-16xx (AT2016xyz) to preserve, rather than anonymize, the origin of the transient.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Mt. Cuba Astronomical Foundation, George Skestos, and the Robert Martin Ayers Sciences Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.