{
  "bibcode": "2010GCN.10793....1A",
  "body": "P. Afonso (MPE Garching), S. Klose (TLS Tautenburg), and J. Greiner (MPE \nGarching), report on behalf of the GROND team:\n\nGROND (Greiner et al. 2008, PASP 120, 405), the 7-channel imager mounted \nat the 2.2m ESO/MPI telescope on La Silla, started follow-up observations \nof the Swift/Fermi burst GRB 100522A (Troja et al. 2010, GCN 10784; \nMcBreen 2010, GCN 10790) on May 23 at 09:18 UT (about 29.5 hrs after the \nburst), and continued for about 1 hour.\n\nWithin the enhanced XRT 1.5 arcsec error circle reported by Osborne et al. \n(GCN 10787) we do not find any afterglow candidate. Based on 50 min of \ntotal exposures in g'r'i'z' and 40 min in JHK, preliminary measured upper \nlimits are (in the AB system, 3 sigma):\n\ng' > 24.8,\nr' > 24.4,\ni' > 23.6,\nz' > 23.3,\nJ  > 21.7,\nH  > 20.9,\nK  > 20.6,\n\nusing GROND zeropoints and the 2MASS catalog.",
  "circularId": 10793,
  "createdOn": 1274630595000,
  "email": "klose@tls-tautenburg.de",
  "subject": "GRB 100522A: GROND observations, upper limits",
  "submitter": "Sylvio Klose at TLS Tautenburg  <klose@tls-tautenburg.de>",
  "eventId": "GRB 100522A"
}