{
  "bibcode": "2015GCN.18481....1P",
  "body": "D. A. Perley (DARK/NBI) and S. B. Cenko (NASA/GSFC) report:\n\nThe Palomar 60-inch robotic telescope responded automatically to the \nalert for GRB 151027A (Maselli et al., GCN151027A) and began a sequence \nof i, r, and z-band imaging at 04:00:49 UT, 145 seconds after the BAT \ntrigger.   We identify a very bright afterglow consistent with the UVOT \nand KAIT (Zheng et al., GCN18479) positions in all filters.\n\nThe preliminary afterglow light curve shows a slow rise to a peak at \nabout ~5 minutes after the GRB trigger, then slowly fades by about 1 \nmagnitude between then and approximately 30 minutes after the trigger. \nOver the next 20 minutes it then rapidly rebrightens by about 0.7 \nmagnitude.  Little or no fading is seen after that point (through to at \nleast 90 minutes after the trigger.)\n\nContinued monitoring is encouraged, and should remain possible even from \nsmall telescopes for quite some time.  High-resolution spectroscopy is \nalso strongly encouraged.",
  "circularId": 18481,
  "createdOn": 1445925423000,
  "email": "dperley@astro.caltech.edu",
  "subject": "GRB 151027A: P60 afterglow confirmation and rebrightening",
  "submitter": "Daniel Perley at Caltech  <dperley@astro.caltech.edu>",
  "eventId": "GRB 151027A"
}