[vsnet-alert 17963] ASASSN-14kb (ATEL)

[Taichi Kato]

ASASSN-14kb

ATEL #6688							     ATEL #6688

Title:	ASAS-SN Discovery of an Outbursting Source Towards the LMC
Author:	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)
Queries:	jose.prietok at mail.udp.cl
Posted:	12 Nov 2014; 14:24 UT
Subjects:Optical, Transient

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.

==============================================================================
ATEL #6690							     ATEL #6690

Title:	ASASSN-14kb = OGLE-LMC529.30.114 is a New Eclipsing SU UMa-type
		Dwarf Nova
Author:	L. Wyrzykowski, P. Mroz, A. Udalski, R. Poleski, Z. Kostrzewa-Rutkowska,
		on behalf of the OGLE-IV team.
Queries:	lw at astrouw.edu.pl
Posted:	12 Nov 2014; 23:08 UT
Subjects:Optical, Cataclysmic Variable, Transient

The transient announced by the ASAS-SN group (Prieto et al. ATEL#6688)
is present in the OGLE-IV Magellanic System monitoring program under OGLE
ID: OGLE-LMC529.30.114. The data collected since 2010 show multiple super-outbursts
with period of about 162 days and numerous normal outbursts.  
Additionally, OGLE-IV data revealed periodic eclipsing behavior in the
quiescence with a period of 0.0681057 days = 98 mins. This behavior fulfils
the criteria of a dwarf nova of SU UMa type. 
The full span light curve and the phase-folded with eclipsing period is
available here:  
http://ogle.astrouw.edu.pl/CVs/OGLE-LMC529.30.114-ASASSN-14kb.pdf 

OGLE-IV will continue the photometric monitoring of this object. Further
studies including spectroscopic observations are encouraged. 

===

ASASSN-14kb 20141109.13 <170V ASN
ASASSN-14kb 20141110.20 155V ASN
ASASSN-14kb 20141111.20 155V ASN
ASASSN-14kb 20141112.22 164V ASN

(likely a normal outburst)