{
  "bibcode": "2013GCN.14655....1S",
  "body": "S. Schmidl, D. A. Kann (both TLS Tautenburg) and J. Greiner (MPE Garching)\nreport on behalf of the GROND team:\n\nWe observed the field of the short GRB 130515A (Swift trigger 555880;\nMalesani et al., GCN 14650) simultaneously in g'r'i'z'JHKs with GROND\n(Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO\ntelescope at La Silla Observatory (Chile).\n\nObservations started as soon as the position became visible above the\npointing limit, at 02:12:08 UT on May 15th, 51 minutes after the BAT\ntrigger. They were performed at an average seeing of 1\".6 and at an\naverage airmass of 2.4.\n\nInside the 2\".9 SPER XRT error circle (RA = 18:53:45.79, Dec.\n-54:16:45.2), we detect a faint source, and additionally a significantly\nbrighter, possibly extended source on the western edge of the XRT error\ncircle.\n\nWe find the following positions (J2000) for these sources:\nIn the error circle: RA = 18:53:45.79, Dec. = -54:16:47.3\nOn the western edge: RA = 18:53:45.24, Dec. = -54:16:44.5\nwith an error of 0\".5 in each case.\n\nBased on an observation with 780 s integration time in g'r'i'z' and 720 s\nintegration time in JHK, centered at 0.043586 days after the trigger, we\nestimate preliminary magnitudes 3-sigma upper limits (all in AB system) of\n\ng' > 23.86,\nr' = 22.55 +/- 0.15,\nz' = 21.17 +/- 0.11,\nJ  = 19.74 +/- 0.27,\nH  > 19.4 and\nK  > 19.1\n\nfor the object inside the error circle, and\n\ng' = 22.12 +/- 0.08.,\nr' = 20.68 +/- 0.03.,\nz' = 19.51 +/- 0.03.,\nJ  = 18.50 +/- 0.09,\nH  = 18.45 +/- 0.14 and\nK  = 18.47 +/- 0.17\n\nfor the possible galaxy on the western edge.\n\nGiven magnitudes are calibrated against GROND zero points (g'r'i'z') as\nwell as 2MASS field stars (JHK) and are not corrected for the expected\nGalactic foreground extinction corresponding to a reddening of\nE_(B-V)=0.07 mag in the direction of the burst (Schlegel et al. 1998).",
  "circularId": 14655,
  "createdOn": 1368597697000,
  "email": "schmidl@tls-tautenburg.de",
  "subject": "GRB 130515A: GROND Observations",
  "submitter": "Sebastian Schmidl at TLS Tautenburg  <schmidl@tls-tautenburg.de>",
  "eventId": "GRB 130515A"
}