{
  "bibcode": "2022GCN.31977....1D",
  "body": "D. Dornic (CPPM), A. Klotz (CNRS-OMP-IRAP), A. Sabahaddin (ShaO),\nT. Midavaine (KNC), V. Rupchandani (AUS), P. A. Duverne (IJCLAB),\nY. Rajabov (UBAI), X. Song (BJP), X. F. Wang (THU/BJP), J. Zhu (BJP),\nL. Wang,�� X. Zeng, A. Iskandar (XAO), P. Thierry (AGORA),\nA. Kaeouach (Tanger), Z. Benkhaldoun (OUCA),\nS. Antier, A. de Ugarte Postigo (CNRS-OCA-ARTEMIS)\nreport on behalf of GRANDMA collaboration:\n\nThe GRANDMA telescope network responded to the alert of GRB 220430A\n(Ambrosi et al. GCN 31972, Osborne et al., GCN 31973,\nGroot et al., GCN 31974, Ursi�� et al., GCN 31975,\nPozanenko et al. GCN 31976). The first observations\nstarted 34 min after the SWIFT BAT trigger time.\n\nWe did not detect any optical transient within the XRT error box\nduring the first 2.9 hours. We report our 3-sigma upper limits.\nMagnitudes are given in the AB system.\n\nT-T0 (hr)| MJD������������ | Obser.���� |Exposure| Filter| Upp.Lim. (AB)\n0.56111�� |59699.60204| SNOVA �������� | 4x300s | Clear | 19.0\n2.59194�� |59699.68666| Makes-T60| 10x120s| Clear | 19.5\n6.24347�� |59699.83880| HAO���������� | 20x120s| L�������� | 20.6\n6.33472�� |59699.84260| MOSS�������� | 30x60s | Clear | 21.0\n\nThe images have been calibrated with SDSS DR7.\nT-T0 is the started date.\n\nGRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr)\ndevoted to the observation of transients in the context of multi-messenger\nastrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is\nthe citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).",
  "circularId": 31977,
  "createdOn": 1651364657000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 220430A: GRANDMA observations",
  "submitter": "Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz@free.fr>",
  "eventId": "GRB 220430A"
}