{
  "bibcode": "2017GCN.20981....1P",
  "body": "Zsolt Paragi (JIVE)\nTao An (Shanghai Astronomical Observatory)\nPhilippe Bacon (APC Universite�� Paris Diderot)\nRob Beswick (JBO-Manchester University)\nEric Chassande-Mottin (APC Universite�� Paris Diderot)\nSa��ndor Frey (Konkoly Observatory)\nMarcello Giroletti (IRA-INAF)\nPeter Jonker (SRON)\nMark Kettenis (JIVE)\nBenito Marcote (JIVE)\nArpad Szomoru (JIVE)\nHuib van Langevelde (JIVE)\nJun Yang (Onsala Space Observatory)\nfor the Euro VLBI team\n\nWe observed the near-IR transient (Yoshida et al., GCN 20784) within\nthe error circle of AGL J1914+1043 (Tavani et al., GCN 20754) with\nthe real-time very long baseline interferometry (e-VLBI) technique\nusing the EVN at 4.9 GHz between 2:06���11:48 UT on 24 March 2017.\nThere is no compact radio emission detected on milliarcsecond scales\nwithin +-4 arcseconds of the near-IR transient coordinates of\nRA=19:10:31.46, DEC=+07:53:52.0, with a 6 sigma upper limit of\n105 microJy/beam.\n\nMore details on the Euro VLBI team observations:\nParticipating EVN telescopes were Effelsberg, Irbene, Jodrell Bank MkII,\nMedicina, Onsala, Noto, Torun, Westerbork (single dish), Yebes,\nArecibo, Hartebeesthoek and Tianma. The observing frequency of 4.9 GHz\nwas preferred over 1.6 GHz because of strong scatter-broadening in\nthis region. The phase-referencing calibrator was J1922+0841, 3 degrees\naway from the target; it has resolved structure on mas scales, but\nstrong fringes were detected. The cycle time was 1:30-3:30 minutes.\nTotal on-source integration time on the target was 4.1 hours.\nA number of other calibrators/calibrator candidates were observed\nas well, most notably J1909+0756 (11 arcminutes from the target),\nthat was detected as a ~30 mJy but quite resolved source (~10 mas\nEast-West; not useful as calibrator beyond 10 Mlambda at this frequency).\nNone of the sources reported by Medicina single dish observations at\n5 GHz (Pilia et al., GCN 20869) were detected (we had 3 times 1-minute\nscans on each). The data were correlated real-time with the\nEVN Software Correlator at JIVE (SFXC) and processed according to\nstandard procedures, using measured system temperature for most\ntelescopes (for Arecibo, Noto, Jodrell Bank we used nominal SEFDs).\n\nThe EVN is a joint facility of independent European, African, Asian,\nand North American radio astronomy institutes. Scientific results\nfrom data presented in this publication are derived from the following\nEVN project code: RP027.",
  "circularId": 20981,
  "createdOn": 1491403835000,
  "email": "zparagi@jive.eu",
  "subject": "LIGO/Virgo G275404: European VLBI Network (EVN) follow-up of the near-IR transient in the AGL J1914+1043 field",
  "submitter": "Zsolt Paragi at Euro VLBI  <zparagi@jive.eu>",
  "eventId": "LIGO/Virgo G275404"
}