ASAS-SN Discovery of Two Bright CVs and New Outbursts from Four Known CVs; Addendum to ATel #5118

ATel #5168; K. Z. Stanek, B. J. Shappee, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullens, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory)
on 26 Jun 2013; 19:55 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"; ATel #4987, #4999, #5010, #5052, #5082, #5102, #5118, #5138), using data from the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered two new transients:

  
Object       RA (J2000)   DEC (J2000)   Disc. UT Date     Approx. Disc. V mag  
ASASSN-13as  17:23:06.36 +17:57:55.9    2013 June 26.42      15.1  
ASASSN-13at  18:21:22.49 +61:48 56.0    2013 June 26.40      14.5 

ASASSN-13as was present in images obtained 2013 UT June 26.42 but undetected (V > 17) on 2013 UT June 24. Vizier reveals an optical source with B = 20.5 detected 1.3" from our ASAS-SN position in the USNO-B1 catalog. There is also a 1.5" match to a faint GALEX source. ASASSN-13as is most likely a CV in an outburst.

ASASSN-13at was detected in images obtained 2013 UT June 26.40 and also present with V~16.0 on 2013 UT June 22 but undetected (V > 17) on 2013 UT June 20. Vizier reveals an optical source with B = 19.5 detected 0.5" from our ASAS-SN position in the USNO-B1 catalog. There is also a 0.9" match to a faint GALEX source. ASASSN-13at is most likely a CV in an outburst.

In addition, new outbursts were detected from four known CVs:

  
Object                   RA (J2000)   DEC (J2000)    Detect. UT Date   Approx. V mag  
CSS080505:163121+103134  16:31:20.87 +10:31:35.2    2013 June 25.35      15.3  
V368 Peg                 22:58:43.42 +11 09 12.5    2013 June 25.5       14.0 
NOVA Ser 1903            16:19:17.68 -02:29:28.5    2013 June 26.41      15.5  
TW Tri                   01:36:37.05 +32:00:40.4    2013 June 26.55      14.1  

NOVA Ser 1903, also known as X Ser, was previously detected as CSS090816:161918-022929 and also had an AAVSO-detected outburst in May 2012. TW Tri shows numerous outbursts in ASAS-SN data, most recently on 2013 UT June 13.

In general, ASAS-SN will not be announcing new outbursts of known CVs via ATel, unless they are particularly noteworthy. Such detections will however be announced via "ASAS-SN Transients" website at http://www.astronomy.ohio-state.edu/~assassin/transients.html and you can also send an e-mail to stanek.32@osu.edu if you would like to be notified of future ASAS-SN detections.

We note that ASASSN-13ap (ATel #5118) was discovered by the CRTS Survey as CSS130529:135642+613025. We thank A. Drake for pointing that out.

For more information about the ASAS-SN project see http://www.astronomy.ohio-state.edu/~assassin/