[vsnet-alert 15868] ASAS-SN Discovery of Two Bright CVs + CSS J163120.9+103134 outburst

[Taichi Kato]

   Both objects deserve time-resolved photometry.

   CSS J163120.9+103134 is an SU UMa-type dwarf nova.
Three past superoutbursts were observed.

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ATEL #5168							     ATEL #5168

Title:	ASAS-SN Discovery of Two Bright CVs and New Outbursts from
		Four Known CVs; Addendum to ATel #5118
Author:	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)
Queries:	stanek.32 at osu.edu
Posted:	26 Jun 2013; 19:55 UT
Subjects:Optical, Cataclysmic Variable, Transient

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 at 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/