[vsnet-alert 20098] Re: ASASSN-16jb: discovery of a very bright transient close to the Galactic Center

[Berto Monard]

Last night's observations of ASASSN-16jb have shown the start of a possible cyclic behaviour with an amplitude of 0.05 (range of 0.1) around an unfiltered CCD magnitude of 13.3. The initial period seems most likely to be 0.0317d (+/- 0.0002) as derived using Peranso's CLEANest method. Alternative periods show up around 0.07d and 0.12d.

The observations were done at CBA Kleinkaroo (KKO) using a 30cm Meade RCX400 f/8 telescope with SBIG ST-8XME CCD camera (2x2 binned) and no filter. Strong moonlight 90 degrees to the East and worsening seeing did negatively affect observing quality towards the end of the run.

Detailed reports will be submitted to CBA and VSNET.

Berto Monard / CBA KKO



-----Original Message-----
From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Berto Monard
Sent: Saturday, August 20, 2016 10:56 PM
To: bas at lowell.edu; vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 20094] Re: ASASSN-16jb: discovery of a very bright transient close to the Galactic Center

V and I observations at CBA Kleinkaroo clearly show transient ASASSN-16jb to be a blue object. Unfiltered timeseries photometry are presently ongoing. No modulation seem to be present at this early stage.

Observing results will be reported.

Berto Monard / KKO

-----Original Message-----
From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Brian Skiff
Sent: Friday, August 19, 2016 11:43 PM
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 20093] Re: ASASSN-16jb: discovery of a very bright transient close to the Galactic Center

On Fri, 2016-08-19 at 16:46 -0400, Kris Stanek wrote:
> http://www.astronomy.ohio-state.edu/~assassin/transients.html
> 
> ASASSN-16jb 	17:50:45 	-25:58:37.2 	2016-08-19.14 	13.2
> 
> Very bright CV candidate caught very early and on the rise, very close 
> to the Galactic center, so could also be a classical nova, V>17.2 on 
> 2016-08-17.04, V=13.3 on 2016-08-18.09, V=13.2 on 2016-08-19.14
> 
> If ASASSN-16jb is a Galactic classical nova, it should appear much 
> brighter in redder bands (R-band or I-band)
> 

     I note a weak detection in the GALEX near-uv image, and also on POSS-I blue/red, but much fainter on UK Schmidt plates.  Assuming the RA end-figures above are 45s.00, the object seems to correspond to a faint star in the UKIDSS survey:  17 50 44.96 -25 58 37.2 (J2000) with J-K = 2.7.  There is a GLIMPSE source 0".26 away at:
17 50 44.94 -25 58 37 (typical scatter ~0".3 in the Spitzer astrometry).


\Brian



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