from:	 Young, Ken 
to:	 Mark Gurwell ,
         Rurik Primiani ,
         Jonathan Weintroub ,
         Eric Keto ,
         Nimesh Patel ,
         Chunhua Qi ,
         Lars Kristensen ,
         David Wilner ,
         Qizhou Zhang ,
         Sridharan Tirupati Kumara ,
         Raymond Blundell ,
         Jun-Hui Zhao 
date:	 Mon, Dec 2, 2013 at 11:40 AM
subject:	 SWARM Phase Closure
mailed-by:	 cfa.harvard.edu

I've looked at the phase closure on BL Lac for the SWARM data we took 
the week before last. Attached are plots of all phase closure triangles 
which include antenna 2. One set of plots shows the phase closure when 
the pseudo-continuum was calculated using the portion of the Legacy 
Correlator which overlapped in frequency with the SWARM Correlator 
(Legacy Correlator chunks s37 through s48). The second set of plots shows 
the phase closure when the pseudo-continuum was calculated from the SWARM data.    
As you can see, all the triangles close to 0 when calculated from the 
Legacy Correlator data, and none of them do when calculated from the SWARM data.   
I think this means that there is a baseline-based phase error in the SWARM data.   
The signal/noise on the SWARM plots is also much higher.

Taco