{
  "bibcode": "2007GCN..6920....1I",
  "body": "M. Im, I. Lee (Seoul National University), and Y. Urata\n  (Saitama University) on behalf of the EAFON team:\n\n   Using the Mt. Lemmon (Arizona, US) 1.0m telescope\n  operated by the Korea Astronomy Space Science Institute,\n  we continued our observation of GRB071010B (GCN 6871,\n  Markwardt et al.), beginning at 11:37:19 UT on Oct 12,\n  or 1.62 days after the trigger.\n   From a stacked image of nine, 5 min frames in the R-band,\n  we detect the OT again (Oksanen GCN 6873, Kann et al. GCN 6884).\n\n   A preliminary photometry of the object using the standard\n  star data taken during the same day is given below\n  (aperture mag with 6\" diameter circle). Also given is a\n  slightly revised R-band magnitude we reported earlier\n  (Im et al., GCN 6897).\n\n\n  t_start (UT)    Filter    exp (sec)    R-mag   err\n-----------------------------------------------------\n  Oct. 11,\n  11:19:47          R        4x300       19.81    0.08\n\n  Oct. 12,\n  11:37:19          R        9x300       20.54    0.10\n\n   Our result is consistent with the recent report that\n  the GRB is fading rather slowly (GCN 6918, Kann et al.;\n  GCN 6919 Kocevski et al.).  However, compared with\n  the magnitudes at Oct. 14 reported by Kann et al. (6918),\n  our photometry suggests a very marginal decrease in\n  the brightness between Oct. 12 - Oct. 14.\n\n   We will report later, the BVRI photometry data\n  taken during the same period.\n\n   This message may be cited.",
  "circularId": 6920,
  "createdOn": 1192498645000,
  "email": "mim@astro.snu.ac.kr",
  "subject": "GRB 071010B: Photometry after 1.6 days",
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "eventId": "GRB 071010B"
}