{
  "bibcode": "2022GCN.32339....1N",
  "body": "A. Nicuesa Guelbenzu, S. Klose (both TLS Tautenburg), and A. Rau (MPE\nGarching) report:\n\nWe observed the field of GRB 220706A (D�Ai et al., GCN 32329) with\nGROND mounted at the 2.2m MPG telescope at La Silla Observatory\n(Chile).\n\nObservations started at a midtime of 09:40 UT on July 07, 2022, about\n17.5 hours after the GRB trigger and were on target for 20 minutes.\nThey were performed at an average seeing of 1.2 arcsec and at an\nairmass close to 1.0.\n\nInside the enhanced Swift/XRT error circle (Goad et al., GCN 32333),\nwe do not detect an optical/NIR transient in any band down to the\nfollowing upper limits (AB mags; 3 sigma):\n\ng' > 25.2,\nr' > 24.9,\ni' > 24.2,\nJ  > 21.7,\nH  > 21.0,\nK  > 19.9.\n\nCombining the GROND optical (g'r'i') and NIR (JHK) bands, no object is\ndetected inside the enhanced XRT error circle either.\n\nOur measurements add to previousely reported results (Gendre et al.,\nGCN 32331; Lipunov et al., GCN 32332; Jiang et al., GCN 32335; de\nUgarte-Postigo et al., GCN 32338).\n\nThe source at the northern border of the enhanced XRT error circle\nreported by de Ugarte Postigo et al. (GCN 32338) is clearly detected\nin our combined gri images. At present we cannot decide whether this\nis a galaxy or not.\n\nThe given limits are derived based on calibrating the optical images\nagainst the Pan-STARRS catalog and the JHK data against 2MASS stars.\nWe thank Sam Kim for excellent support and for performing the\nobservations.",
  "circularId": 32339,
  "createdOn": 1657199872000,
  "email": "ana@tls-tautenburg.de",
  "subject": "GRB 220706A, GROND observations",
  "submitter": "Ana Nicuesa at TLS Tautenburg  <ana@tls-tautenburg.de>",
  "eventId": "GRB 220706A"
}