eco.astrosky.transient.gcn

{
  "data": "{\"$schema\": \"https://gcn.nasa.gov/schema/v6.0.0/gcn/circulars.schema.json\", \"submitter\": \"Massimiliano Lincetto at Aix Marseille Univ, CNRS/IN2P3, CPPM <lincetto@cppm.in2p3.fr>\", \"submittedHow\": \"web\", \"subject\": \"EP260405.149 / EP-WXT 11900672904: COLIBR\\u00cd optical upper limits\", \"circularId\": 44220, \"format\": \"text/plain\", \"body\": \"Massimiliano Lincetto (CPPM), Alan M. Watson (UNAM), Jean-Gr\\u00e9goire Ducoin (CPPM), St\\u00e9phane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Leonardo Garc\\u00eda Garc\\u00eda (UNAM), Ramandeep Gill (UNAM), No\\u00e9mie Globus (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Nikos Mandarakas (LAM), Diego L\\u00f3pez-C\\u00e1mara (UNAM), Francesco Magnani (CPPM), Enrique Moreno M\\u00e9ndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd S\\u00e1nchez \\u00c1lvarez (UNAM), Benjamin Schneider (LAM) and Antonio de Ugarte Postigo (LAM) report:\\n\\nWe imaged the field of the EP-WXT transient EP260405.149 using the DDRAGO two-channel wide-field imager on the COLIBR\\u00cd telescope. Observation started within 30 seconds from the alert reception. We observed on 2026-04-05 from 09:51:17 to 10:30:32 UTC (from 6.25 to 7 hours after the trigger T0) and obtained 1920 seconds of simultaneous exposure in the r and z filters.\\n\\nThe data were reduced and co-added with the COLIBR\\u00cd pipeline and analysed with STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the PanSTARRS DR2 catalog, is in the AB system, and is not corrected for Galactic extinction.\\n\\nIn the stacked image, we do not detect any new source at the WXT source position down to the following 3-sigma limit:\\n\\nr > 21.11\\nz > 20.57\\n\\nFurther observations may be planned.\\n\\nWe thank the staff of the Observatorio Astron\\u00f3mico Nacional at Sierra de San Pedro M\\u00e1rtir, as well as the technical and engineering teams at CEA, CPPM, IRAP, LAM, OHP, OSU Pytheas, and UNAM.\\n\\nCOLIBR\\u00cd is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astron\\u00f3mico Nacional on the Sierra de San Pedro M\\u00e1rtir, Baja California, Mexico.\", \"createdOn\": 1775405059170}",
  "$type": "eco.astrosky.transient.gcn",
  "topic": "gcn.circulars",
  "eventID": 50265,
  "createdAt": "2026-04-05T16:04:27.451855Z"
}

did:plc:2o4hrvrj5vsicfuqlxhtk6qy | at://did:plc:2o4hrvrj5vsicfuqlxhtk6qy/eco.astrosky.transient.gcn/3mir4uaxm322w