ASAS-SN Prediscovery Photometry of MASTER OT J175924.12+252031.7

ATel #6061; K. Z. Stanek, B. J. Shappee, C. S. Kochanek, T. W-S. Holoien, J. Jencson, U. Basu, B. Danilet, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU)
on 10 Apr 2014; 22:25 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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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 detected a new transient source:

 
Object        RA (J2000)   DEC (J2000)     Disc. UT Date   Disc. V mag 
ASASSN-14an   17:59:24.02  25:20:33.2 	   2014-04-10.51 	13.3 

ASASSN-14an has coordinates very close to the bright transient source OT J175924.12+252031.7 discovered by the MASTER project (Vladimirov et al. 2014, ATel #6059). ASASSN-14an was automatically detected in ASAS-SN images obtained on 2014-04-10.51, and it was also present (but not automatically detected) in poor image quality data taken on the following dates:

 
UT Date                 preliminary V mag 
2014-04-04.53               below 17.0 
2014-04-08.46              12.9 +- 0.1 
2014-04-09.483             12.9 +- 0.1 
2014-04-10.511             13.3 +- 0.1 

OT J175924.12+252031.7 was not detected (V>17.0) in ASAS-SN data taken at this location on UT 2014 Apr. 04.5 and earlier. Our prediscovery photometry is broadly consistent with prediscovery data reported by Dintinjana and Mikuz via vsnet-alert 17194.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.