{
  "format": "text/plain",
  "subject": "GRB 250419A: Calapai Observatory, Massa S. Giorgio (Messina), optical observations.",
  "circularId": 40209,
  "eventId": "GRB 250419A",
  "submitter": "Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, Messina, Italy <giovannicalapai@tiscali.it>",
  "body": "Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, (Messina) Italy \nMember of: GRB/UAI Gamma Ray Burst Section of Unione Astrofili Italiani. \n\nReport:\n\nWe observed the field of GRB 250419A detected by SVOM/ECLAIRs (Wang et al. GCN 40168) with the 11 inches Schmidt-Cassegrain (Celestron 11) telescope F/D=6,3. \n  \nThe observations were started at 2025-04-19 23:55 UT (approximately 21.43 hours after burst) stacking a set of unfiltered CCD image. The observations were carried out with clear skies\nand good visibility conditions.\n\nThe OT was detected at the following position:\n\nRA    (J2000.0)  13h 29m 37.33s   \nDecl. (J2000.0) +07° 02' 27.5\" \n \nPhotometry was obtained using nearby PanSTARRS stars as follows: \n\nObservation    Mid-Time    T-T0 (hr)      Exposure        Filter      Mag.        Err.\n2025-04-20   01:19:29 UT    22.83         164x60s           CR       19.76      +/-0.06\n\nMagnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations. \nNo correction for galactic dust extinction was applied.\n\nOur observations are consistent with other already reported López et al. (GCN 40169), Xin et al. (GCN 40170), Zheng et al. (GCN 40171), Kumar et al. (GCN 40172), Lipunov et al. (GCN 40179), Odeh et al. (GCN 40180), Perley & Bochenek (GCN 40181), Pankov et al. (GCN 40182), Pérez-Fournon et al. (GCN 40183), Kuin (GCN 40185), Wu et al. (GCN 40186), Xie et al. (GCN 40187), Jiang et al. (GCN 40188), Ghosh et al. (GCN 40189), Bochenek & Perley (GCN 40190), Pankov et al. (GCN 40202), Masi (GCN 40206).\n\nThe message may be cited.",
  "submittedHow": "web",
  "bibcode": "2025GCN.40209....1C",
  "createdOn": 1745336712338
}