{
  "bibcode": "2011GCN.11914....1K",
  "body": "Matus Kocka (AI AS CR), Rudolf Slosiar (Rudy BASE Observatory\nBojnice), Vladimir Karlovsky (Observatory Hlohovec), Richard Marko (AI\nAS CR), Jan Karlovsky (Observatory Hlohovec), Rene Hudec (AI AS CR)\n\n\nWe observed the ionospheric perturbation on Apr. 7th which started at\n14:06:21 UT from 3 different VLF receivers, so called SID monitors\n(Sudden Ionospheric Disturbance) on ICV channel 20.27kHz. This event\nis with a high probability GRB 110407A (Wolf et al., GCN 11895). The\ndetectors are located in Bojnice (Slovakia), Hlohovec (Slovakia) and\nBrno (Czech Republic). Those places are so far apart that we can rule\nout a possibility of a local disturbance.\n\nThe plot from all three SID-monitors is here:\nhttp://zeus.asu.cas.cz/~koci/grb110407a/GRB110407A_vlf.png\n\nFurther analysis is ongoing.",
  "circularId": 11914,
  "createdOn": 1302365837000,
  "email": "kocka.mat@gmail.com",
  "subject": "GRB 110407A:VLF observations on 20.27kHz",
  "submitter": "Matus Kocka at AI AS CR, Ondrejov  <kocka.mat@gmail.com>",
  "eventId": "GRB 110407A"
}