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ASAS-SN Discovery of an Outbursting Source Towards the LMC

ATel #6688; J. L. Prieto (Diego Portales; MAS), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 12 Nov 2014; 14:24 UT
Credential Certification: Jose L. Prieto (jose.prietok@mail.udp.cl)

Subjects: Optical, Transient

Referred to by ATel #: 6690

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source towards the LMC:

  
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  
ASASSN-14kb  04:46:49.860  -71:22:56.38      2014-11-11.20       15.4  

ASASSN-14kb was discovered in images obtained on UT 2014-11-11.20 at V~15.5 mag. We also detect the object in images obtained on UT 2014-11-10.20 (V~15.5) and already fading by ~1 mag on UT 2014-11-12.22 (V~16.4). We do not detect the object (V > 17 mag) in images obtained UT 2014-11-09.13 and earlier (undetected since the survey started in May 2014). The transient is consistent with the position of a blue source in the MCPS (Zaritsky et al. 2004), with U=18.00 +/- 0.04, B=18.63 +/- 0.04, V=19.02 +/- 0.04, I=19.23 +/- 0.07. It is also detected in the IRSF near-IR catalog (Kato et al. 2007), where it shows variability of 1.7-1.9 mag in three epochs of J, H and K-band photometry (MJD=52598.989, J=15.62 +/- 0.03, H=15.38 +/- 0.02, K=15.14 +/- 0.03; MJD=52608.886, J=17.51 +/- 0.03, H=17.04 +/- 0.04, K=16.65 +/- 0.12; MJD=53400.894, J=17.22 +/- 0.03, H=16.92 +/- 0.07, K=16.85 +/- 0.13). Follow-up observations are encouraged.