ASASSN-16fx: Discovery of A Probable Supernova in GALEXASC J020044.56-461644.0

ATel #9127; J. S. Brown, K. Z. Stanek, 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), Subo Dong, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 8 Jun 2016; 17:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Tweet

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy GALEXASC J020044.56-461644.0.

ASASSN-16fx (AT 2016csd) was discovered in images obtained on UT 2016-06-08.43 at V~17.2 mag. We also detect the object in images obtained on UT 2016-06-07.42 (V~17.2) and 2016-06-06.41 (V~17.4). We do not detect (V>17.6) the object in images taken on UT 2016-05-28.44 and before. This figure shows the ASAS-SN V-band reference image (left), the ASAS-SN subtraction image (middle), and the archival DSS image of the host (right). The red circle has a radius of 10" and is centered on the position of the transient in the discovery image.

The position of ASASSN-16fx is approximately 3.5" South and 4.0" East from the center of the galaxy GALEXASC J020044.56-461644.0 (no redshift information available from NED). 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-16fx  02:00:44.960   -46:16:49.05     2016-06-08.43      17.2           N/A                5.32 

 
Obs. UT Date         V mag 
2016-05-28.44        >16.6 
2016-06-06.41         17.4 
2016-06-07.42         17.2 
2016-06-08.43         17.2 
 

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.