{
  "bibcode": "2007GCN..6382....1G",
  "body": "Galante N., Garczarczyk M., Gaug M., Scapin V., Bastieri D. and Longo F.\nreport for the MAGIC collaboration:\n\nThe MAGIC Imaging Atmospheric Cherenkov Telescope performed a follow-up\nobservation of the SWIFT-BAT burst GRB070412 (GCN circular 6273, Romano P.\net al.). We received the delayed GCN alert at T0+647s, The data taking\nwith MAGIC started at T0+701s, 27s after the alert income. We observed the\nsky positon for 124min on April 12th and for further 178min on April 13th,\nstarting at T0+7.6x10^4s.\n\nNo evidence for VHE gamma-ray emission above the analysis threshold of\n90 GeV was found in both data sets. A preliminary analysis, for the\nhypothesis of steady emission and assumption of a differential photon\nspectral index of -2.5, yields the following 95% CL differential flux\nupper limits (inc. 30% systematic error on the absolute flux level):\n\nE(80-125 GeV)   : 1.03 x 10^(-11) erg/cm^2/s\nE(125-175 GeV)  : 0.31 x 10^(-11) erg/cm^2/s\nE(175-300 GeV)  : 0.75 x 10^(-11) erg/cm^2/s\nE(300-1000 GeV) : 0.77 x 10^(-11) erg/cm^2/s\n\nThe upper limits correspond to the time period between T0+701s and\nT0+8181s.\n\nWe can also exclude emission of a constant flux during our observation in\nany 100s time bin higher than:\n\nE(80-200 GeV)   : 2.2 x 10^(-9) erg/cm^2/s\nE(200-1000 GeV) : 0.5 x 10^(-9) erg/cm^2/s\n\nfor the time period between T0+701s and T0+8181s, and:\n\nE(80-200 GeV)   : 2.5 x 10^(-9) erg/cm^2/s\nE(200-1000 GeV) : 0.5 x 10^(-9) erg/cm^2/s\n\nfor the time period between T0+7.6x10^4 s and T0+8.7x10^4 s.\n\nThis message can be cited.",
  "circularId": 6382,
  "createdOn": 1178557518000,
  "email": "garcz@mppmu.mpg.de",
  "subject": "GRB070412: MAGIC telescope GeV observation",
  "submitter": "Markus Garczarczyk at MPI/MAGIC  <garcz@mppmu.mpg.de>",
  "eventId": "GRB 070412"
}