{
  "bibcode": "2010GCN.11419....1F",
  "body": "T. A. Fatkhullin, V. N. Komarova, V.V. Sokolov, A.S. Moskvitin \n(SAO-RAS), J. Gorosabel, A. Sota and A.J. Castro-Tirado (IAA-CSIC),  A. \nde Ugarte Postigo (DARK/NBI), on behalf of a larger collaboration, report:\n\n\"Following the detection of the optical afterglow to the INTEGRAL GRB \n101112A (Gotz et al., GCNC 11396), we have undertaken observations of\nthe region with the 1.5-m telescope at Sierra Nevada Obs. (Spain) on Nov \n13 and with the 6.0-m BTA at SAO-RAS in Zelenchukskaia (Russia) on Nov \n14 and Nov 15. At the location of the optical afterglow (Guidorzi et \n al., GCNC 11397, de Ugarte Postigo et al., GCNC 11398) a faint source \nwith R-band magnitude about 23 was detected on Nov 14.766 UT, which was \nbelow the detection limit on Nov 15.838 UT. This value should be \ncompared with R = 15.6, as derived from the BOOTES-2/TELMA early time \nimages on Nov 12.9260 UT (a value that supersedes the one given on GCNC \n11398 which was based on a wrong photometric calibration). The fact that \nthe optical counterpart is blended (1.\"2) with a brighter star (with R \nabout 18) has made useless the attempted spectroscopy on Nov 14.8 UT.\"\n\nThis message can be quoted.",
  "circularId": 11419,
  "createdOn": 1290157243000,
  "email": "ajct@iaa.es",
  "subject": "GRB 101112A: OSN and BTA observations",
  "submitter": "Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct@iaa.es>",
  "eventId": "GRB 101112A"
}