{
  "body": "A. J. Castro-Tirado (IAA-CSIC Granada), A. de Ugarte Postigo (ESO\nSantiago), M. Jelínek, J. Gorosabel, A. Marín Fernández de Capel\n(IAA-CSIC), C. Abia (Universidad de Granada), D. Pérez-Ramírez (Univ. de\nJaén & U. Leicester), D. Malesani (DARK/NBI), S. Guziy (Univ. of\nNikolaev) and R. Oreiro (IAC), on behalf of a larger collaboration,\nreport:\n\n\"Following the detection of GRB 071021 by SWIFT (Barthelmy et al. GCNC\n6958) we have obtained JHK-band observations (300s each) with the 3.5m\nTelescopio Nazionale Galileo at Observatorio del Roque de los Muchachos\nin La Palma and optical observations with the 2.5m Nordic Optical\nTelescope (1200s, R-band)\nand with the 1.5m telescope (3960s, I-band) at Observatorio de Sierra\nNevada.\nThe NIR frames were obtained  starting on 21.872 Oct (i.e. 11.25 hr after\nthe BAT trigger).\n\nWithin the XRT error box (Page et al. GCNC 6963) there seems to be an\nindication of a faint source at RA(J2000) = 22:42:34.31  Dec(J2000)=\n+23:43:06.5 (+/- 1\"). The object seems to be barely detected in the -H\nand -K bands, but not in J,  indicating a highly obscured object or a\nvery high-z (~10) event, supporting in the latter case the SWIFT high-z\nindications (Sakamoto et al. GCNC 6967).\n\nA finding chart is available at:\n\nhttp://www.iaa.es/~deugarte/GRBs/071021/GRB071021_JHK.jpg\n\nFurther analysis is ongoing.\n\nAdditional NIR observations are needed to confirm the reality of this\nsource and whether this is the NIR afterglow to  GRB 071021.\"\n\n[GCN OPS NOTE(22oct07): Per author's request, the coordinates were \ncorrected from \"RA(J2000) = 10:58:11.3  Dec(J2000)=+53:50:56\" to\n\"RA(J2000) = 22:42:34.31  Dec(J2000)=+23:43:06.5\".]\n\n[GCN OPS NOTE(24oct07): Per author's request, \"U Leceister\" was changed to\n\"U. Leicester\".]",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "eventId": "GRB 071021",
  "subject": "GRB 071021: optical and NIR observations",
  "version": 2,
  "submitter": "Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct@iaa.es>",
  "format": "text/plain",
  "email": "ajct@iaa.es",
  "createdOn": 1193013094000,
  "circularId": 6968,
  "editedOn": 1731924481217,
  "bibcode": "2007GCN..6968....1C"
}