{
  "bibcode": "2010GCN.11180....1S",
  "body": "R. S�nchez-Ram�rez, J.C. Tello, A. Sota, J. Gorosabel, A.J. Castro-Tirado\n(IAA-CSIC, Granada), report on behalf of a larger collaboration:\n\n\"We have taken several series of BVRI-band images of the  Swift GRB 100901A\n(Immler et  al. GCNC  11159) optical afterglow  (Guidorzi et  al. GCNC\n11160) with the  1.5m  telescope at  Observatorio  de Sierra  Nevada, Spain.\n  The  afterglow is  well  detected  in  the four  bands,  with preliminary\n average magnitudes (calibrated against  USNO  B1.0  and GSC  3.2 stars) of\n B~18.0 (Sep  2.021 UT), V~17.4  (Sep 2.035 UT),  R~17.3 (Sep 2.003 UT) and\nI~17.3 (Sep 2.049 UT).\"",
  "circularId": 11180,
  "createdOn": 1283456085000,
  "email": "jtello@iaa.es",
  "subject": "GRB 100901A: 1.5m OSN BVRI-band observations.",
  "submitter": "Juan Carlos Tello at IAA-CSIC  <jtello@iaa.es>",
  "eventId": "GRB 100901A"
}