{
  "bibcode": "2024GCN.38500....1P",
  "circularId": 38500,
  "subject": "GRB 241209A: GRANDMA/TAROT upper limit",
  "body": "M. Pillas (ULiege), S. Antier (OCA), O. Pyshna (Caltech), N. Guessoum (AUS), A. Klotz (IRAP), C. Andrade (UMN), M. Boer, C. Limonta (OCA), S. Karpov (FZU), M. Coughlin (UMN), , P. Hello (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC),  D.Turpin (CEA-Saclay/Irfu), on behalf of the GRANDMA collaboration:\n\nWe observed the field of GRB 241209A, detected by Fermi/GBM (GCN 38474) and SWIFT/BAT (GCN 38476) using TAROT,/TCA and TCH. Observations began 3.5 min after Swift/T0 for TCA and 3.7 minutes after the trigger for TCH and both without a filter and continue up to 180 min after T0.\n\nWeather was not great at TCA with an upper limit of 16 mag in r-mag of the image.\n\nWe did not detect any optical afterglow candidate with TCH to an upper limit of 19 mag in r and from T0+3 min to T0+6.1min within a circle of 6 arcmin radius centered on the most updated Swift/XRT source location (GCN 38486).\nIt is consistent with GOTO's report (GCN 38481) and VLT's report (GCN 38484).\n\nAll the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). \n\nGRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).",
  "createdOn": 1733779240699,
  "eventId": "GRB 241209A",
  "submittedHow": "web",
  "submitter": "marion.pillas@ligo.org",
  "format": "text/plain"
}