Jordan, TJ, Jess, Andy, Nairwita

We noticed that there  was a significant increase in loud SNR glitch rate at the end of 3rd November's lock (Fig 1 and 2). While going through the HVETO  result we noticed that these glitches were vetoed out at round 1 and the auxiliary channel used to veto out these triggers is : PEM-EY_MAINSMON_EBAY_QUAD_SUM  (Fig 3).  Omega scan of one of such glitch can be seen in Fig 4. 

The spectrum of one of the EY EBAY mainsmon channel is also attached. The "Blue" one is the current spectrum (4th Nov ~ 10:45pm UTC) and red one corresponding to one of the coincident glitch time.  Though the later one (red trace) is slightly elevated in compare to the blue one, it's hard to believe that Mainsmon glitches with such small SNR can create those glitches in DARM. 

We did notice some related glitches in EX Mainsmon (but not in CS Mainsmon channel, any magnetometers or microphones).  HEPI L4C, GS13s and ACC channels  at corner station have some glitches around the same time. 

The main question is why these glitches are showing up in end station Mainsmon channels and around the same time at corner station seismometers.