[vsnet-outburst 10417] SDSS J161027.61+090738.3 = CSS090727:161028+090739

[David Boyd]

1.9hrs of unfiltered photometry of this blue (g=20.10, r=20.06) object in the 
SDSS catalogue showed apparent superhumps with period about 0.063d and amplitude 
0.04 mag. Mean magnitude was 14.09C.

This appears to be a previously unknown SU UMa type dwarf nova in a 6 mag 
superoutburst.

Regards,
David Boyd

----- Original Message ----- 
From: "Hiroyuki Maehara" <maehara at kwasan.kyoto-u.ac.jp>
To: <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp>
Sent: Monday, July 27, 2009 8:09 AM
Subject: [vsnet-outburst 10410] OT_J161027.6+090739 = CSS090727:161028+090739


> Dear colleagues,
>
> The Catalina Real-Time Transient Survey (Drake et al. 2009, ApJ, 696, 870)
> discovered a bright OT, CSS090727:161028+090739.
>
> 907271090864112546 2009-07-27T06:36:21 2009-07-27T06:31:44 16 10 27.63 +09 07 
> 38.5 13.87 13.88 13.85 13.85 
> http://nesssi.cacr.caltech.edu/catalina/20090727/907271090864112546.html
>
> There is a 20 mag blue object in SDSS Catalog.
> The SDSS spectrum shows a blue continuum and double-peaked Halpha
> and Hbeta emission lines.
> http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587742610276024800
> http://cas.sdss.org/astro/en/get/specById.asp?id=711240219487109120
>
> The object is likely a dwarf nova in outburst.
> Follow-up observations are encouraged.
>
> Best regards,
> Hiroyuki Maehara
>