{
  "bibcode": "2008GCN..7701....1K",
  "body": "D. A. Kann, C. Hoegner, S. Ertel and S. Schulze (TLS Tautenburg) report:\n\nWe observed the field of the AGILE GRB 080507 (Lapshov et al., GCN 7697) \nwith the Tautenburg 1.34m Schmidt telescope after twilight in good \nconditions. We obtained 12 usable 180 second images in the Rc band, with a \nmid-exposure time of 1.54 days after the GRB.\n\nAt the position of the brightest X-ray source (Mangano et al., GCN 7699), \nwe detect an optical source that is not visible in the DSS (but is \nsignificantly below the limiting magnitude) or the SDSS (which has a \ncomparable limiting magnitude to our image). We consider this the optical \nafterglow of GRB 080507 due to the coincidence with the bright X-ray \nsource. At the moment, we can't make any claims of variability.\n\nAssuming the USNOB1.0 star just to the north of the afterglow position, at \nR.A. = 15 34 43.7, Dec. = +56 26 21, has R1 = 14.96 (R2 = 15.08), we find \na magnitude for the afterglow of:\n\ntime (days)\tRc\tdRc\n\n1.5383\t\t22.10\t0.11\n\nFurther follow-up is encouraged to confirm a fading nature for this \nsource.\n\nWe note that the error circle of the second faint X-ray source at R.A. = \n233.662500, Dec. = 56.420972 (Mangano et al., GCN 7699) also contains an \noptical source clearly visible in the SDSS and in our images, implying \nthat this is a persistent source.\n\nThis message may be cited.",
  "circularId": 7701,
  "createdOn": 1210288561000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 080507: Optical Afterglow",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 080507"
}