{
  "bibcode": "2010GCN.10613....1P",
  "body": "S. B. Pandey (U Mich), W. Zheng (U Mich), Limin Xiao (Louisiana State) and\nT. Guver (U Arizona), report on behalf of the ROTSE collaboration:\n\nROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe,\nTurkey, responded to GRB 100418A (Swift trigger 419797), producing images\nbeginning 4.6 s after the GCN notice time. An automated response took the\nfirst image at 21:10:30.5 UT, 16.7 s after the burst, and during the\ngamma-ray emission, under fair conditions. We took 10 5-sec, 10 20-sec and\n10 60-sec exposures. These unfiltered images are calibrated relative to\nUSNO A2.0 (R). Imaging is on going.\n\nComparison to the DSS (second epoch) reveals no new sources within the\n3-sigma Swift/BAT error circle or the XRT error circle, for both single\nimages and coadding into sets of 10. Individual images have limiting\nmagnitudes ranging from 15.1-16.2; we set the following specific limits.\n\nstart UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?\n--------------------------------------------------------------------\n21:10:30.6   21:10:35.6         5     15.4           16.7       N\n21:10:30.6   21:12:37.9       127     16.8           16.7       Y\n\nFurther observations are ongoing.",
  "circularId": 10613,
  "createdOn": 1271626505000,
  "email": "shaship@umich.edu",
  "subject": "GRB 100418A: ROTSE-III Optical Limits",
  "submitter": "Shashi Bhushan Pandey at ROTSE  <shaship@umich.edu>",
  "eventId": "GRB 100418A"
}