{
  "bibcode": "2001GCN..1129....1B",
  "body": "G. Beskin, V. Debur, A. Panferov, I. Panferova, V. Plokhotnichenko (SAO),\nA. Pozanenko,  (IKI),\nM. Boer, J.L. Atteia, A. Klotz (CESR/CNRS),\nG. Ricker (MIT)\n\nWe have observed SGR 1806-20 during its probable gamma-ray activity (GCN\n1068, 1089). Observations were  performed with 6-meter telescope of Special\nAstrophysical Observatory equipped with the high time resolution\nMultichannel Panoramic Photometer-Polarimeter and MANIA registration system.\nObservations of a 1 arcmin diameter area covered IPN position  of the object\n(K.Hurley, ApJ, 523, L37, 1999) were  carried out in B band on June,  20th\nand August,  22nd. The start time on June, 20 is UT 19:58 (2 days after HETE\ntrigger), and start time in August, 22 is UT 20:31 (16 hours after HETE\ntrigger).  Accumulation time is 4500s and 800s, respectively.    The arrival\ntime of  each photon was measured with an accuracy of 1 mcsec, and the\nspatial  resolution reached 0.2 arcsec.\n\nNo variable emission in  the  range 2 mcsec - 1s was found in 300 sq.arcsec\nregion centered in IPN source  position. Three sigma upper limits for the\nrelative power (in respect to background) of the variable radiation\ncomponent in the form of triangle-like flares with a filling factor of 0.1\nare: 35% at 5 mcsec, 10% at 0.5 ms, 5% at 0.01 s and 1% at 1s.  Analysis of\nentire image area for variable emission is in progress.",
  "circularId": 1129,
  "createdOn": 1004815104000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "Optical observation of SGR 1806-20 at the 6-m SAO telescope",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>"
}