{
  "bibcode": "2010GCN.11198....1U",
  "body": "T. N. Ukwatta (GWU/GSFC), T. Sakamoto (GSFC/UMBC), N. Gehrels (GSFC),\nand K. S. Dhuga (GWU)\n\nWe observed the Swift GRB 100901A (Immler et al., GCN 11159)\nwith the Lightbuckets 0.61m rental telescope LB-0001 in Rodeo, NM,\nUSA. Under good weather conditions, observations were carried out in\nthe R filter starting Sep. 02 (UT) 07:05 (~ 17.5 hours after\nthe GRB trigger) and a followup observation was performed on\nSep. 03 (UT) 07:01 under acceptable weather conditions.\n\nThe burst afterglow is clearly detected with a R magnitude of ~18.05\nin the first observation. The afterglow, not corrected for Galactic\nextinction, is calibrated against the USNO-B1.0 R1 mag catalog.\n\nTime after trigger      Exposure (s)        R Magnitude\n\n17.5 hours (0.7 days)      3 x 60            ~ 18.05\n41 hours   (1.7 days)     10 x 60            > 19.1\n\n\nWe acknowledge the helpful assistance of the Lightbuckets staff, in\nparticular LightBuckets CEO Stephen G. Cullen.",
  "circularId": 11198,
  "createdOn": 1283544154000,
  "email": "tilan.ukwatta@gmail.com",
  "subject": "GRB 100901A: Lightbuckets Optical Observations",
  "submitter": "Tilan Ukwatta at GSFC/GWU  <tilan.ukwatta@gmail.com>",
  "eventId": "GRB 100901A"
}