{
  "bibcode": "2014GCN.16315....1K",
  "body": "D. Kawamura, T. Sakamoto, I. Takahashi, A. Yoshida (AGU)\n\nWe observed the field of GRB 140521A detected by Swift (trigger #599546; \nTroja et al., GCN Circ. 16311) with the 12-inch AGU Robotic Optical \nMonitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara \ncampus of Aoyama Gakuin University.  \n\n15 images of 60 sec exposures were taken in the R filter starting from \nMay 21 17:36:17 (UT) about 119 sec after the trigger \n(104 sec after the BAT position notice) and stopped on May 21 18:03:04 (UT).  \nWe do not detect the optical afterglow both in the individual images and \nthe stacked image inside the BAT flight position (Troja, et al., GCN #16311).  \nThe estimated five sigma upper limit of the combined image (total exposure of  900 sec) \nis ~17.2 mag using the USNO-B1 catalog.",
  "circularId": 16315,
  "createdOn": 1400754709000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 140521A: AROMA-N Optical Observation",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 140521A"
}