{
  "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 250502A detected by SVOM/ECLAIRs (Wang et al. GCN 40313) with the 11 inches Schmidt-Cassegrain (Celestron 11) telescope F/D=6,3. \n  \nThe observations were started at 2025-05-02 21:24 UT (approximately 12.62 hours after burst) stacking a set of unfiltered CCD image. The observations were carried out with clear skies\nand good visibility conditions.\n\nWe detected a very faint object at the following position:\n\nRA    (J2000.0)  13h 46m 05.62s   \nDecl. (J2000.0) -10° 45' 32.3\" \n\nPhotometry was obtained using nearby PanSTARRS stars as follows: \n\nObservation    Mid-Time    T-T0 (hr)      Exposure        Filter      Mag.      Mag. err.\n2025-05-02   23:44:41 UT    14.97         200x60s           CR       20.70      +/-0.16\n\nMagnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations. No correction for galactic dust extinction was applied.\n\nOur observations are consistent with other already reported Rakotondrainibe et al. GCN 40315; An et al. GCN 40319; Li et al. GCN 40320; Ghosh et al. GCN 40322; de Ugarte Postigo et al. GCN 40328; Pérez-Fournon et al. GCN 40330; Odeh et al. GCN 40331; Bochenek & Perley GCN 40333; Corcoran et al. GCN 40334; Leonini et al. GCN 40337; Zheng et al. GCN 40338; Pankov et al. GCN 40339; Brivio et al. GCN 40349; Quadri et al. GCN 40370.\n\nThe message may be cited.",
  "circularId": 40397,
  "submittedHow": "web",
  "format": "text/plain",
  "submitter": "Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, Messina, Italy <giovannicalapai@tiscali.it>",
  "bibcode": "2025GCN.40397....1C",
  "subject": "GRB 250502A: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.",
  "createdOn": 1746714393511,
  "eventId": "GRB 250502A"
}