{
  "bibcode": "2013GCN.15526....1K",
  "body": "D. Kawamura, T. Sakamoto, I. Takahashi, S. Sugai, A. Yoshida (AGU)\n\nWe observed the field of GRB 131127A detected by Swift (trigger #579571; \nMarkwardt et al., GCN Circ. 15516) with the 12-inch AGU Robotic Optical \nMonitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara \ncampus of Aoyama Gakuin University.  \n\n60 images of 60 sec exposures were taken in the R filter starting from \nNovember 27 10:42:18 (UT) about 30 minutes after the trigger and \nstopped on November 27 11:48:15 (UT).  We do not detect the optical \nafterglow both in the individual images and the stacked image, which \ncombined 57 good quality images, inside the enhanced XRT position \n(Evans, et al., GCN #15520).  The estimated five sigma upper limit of \nthe combined image (total exposure of 3420 sec) is ~16.6 mag using \nthe USNO-B1 catalog.\n\n[GCN OPS NOTE(29nov13): Per author's request, the \"November 11\" date\nwas changed to \"November 27\" in two places.]",
  "circularId": 15526,
  "createdOn": 1385638616000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 131127A: AROMA-N Optical Observation",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 131127A"
}