{
  "$schema": "https://gcn.nasa.gov/schema/v7.0.0/gcn/notices/boom/alert.schema.json",
  "alert_datetime": "2025-11-30T10:28:57Z",
  "mission": "Boom",
  "data": {
    "targets": [
      {
        "event_name": "ZTF25acffkdr",
        "ra": 150.175649,
        "dec": 15.2832185,
        "classification_scores": { "Type II": 0.9 },
        "gcn_crossmatch": [
          { "ref_type": "GW", "ref_instrument": "LVK", "ref_ID": "S251117bs" }
        ]
      }
    ],
    "photometry": [
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-27T14:03:06.509Z",
        "telescope": "Asteroid Terrestrial-impact Last Alert System",
        "instrument": "ATLAS",
        "filter": "atlaso",
        "mag_system": "AB",
        "limiting_mag": 19.53
      },
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-28T10:07:08.003Z",
        "telescope": "Palomar 1.2m Oschin",
        "instrument": "ZTF",
        "filter": "ztfg",
        "mag": 18.1,
        "mag_error": 0.02,
        "mag_system": "AB",
        "limiting_mag": 20.48
      },
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-28T11:10:01.998Z",
        "telescope": "Palomar 1.2m Oschin",
        "instrument": "ZTF",
        "filter": "ztfr",
        "mag": 18.37,
        "mag_error": 0.03,
        "mag_system": "AB",
        "limiting_mag": 20.58
      },
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-29T03:25:56.064Z",
        "telescope": "Liverpool Telescope",
        "instrument": "IOO",
        "filter": "sdssg",
        "mag": 17.78,
        "mag_error": 0.03,
        "mag_system": "AB",
        "limiting_mag": 20.96
      },
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-29T03:27:29.117Z",
        "telescope": "Liverpool Telescope",
        "instrument": "IOO",
        "filter": "sdssr",
        "mag": 18.08,
        "mag_error": 0.04,
        "mag_system": "AB",
        "limiting_mag": 21.2
      },
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-29T03:30:57.600Z",
        "telescope": "Liverpool Telescope",
        "instrument": "IOO",
        "filter": "sdssz",
        "mag": 18.68,
        "mag_error": 0.09,
        "mag_system": "AB",
        "limiting_mag": 20.39
      },
      {
        "event_name": "ZTF25acffkdr",
        "observation_start": "2025-11-30T10:28:56.997Z",
        "telescope": "Palomar 1.2m Oschin",
        "instrument": "ZTF",
        "filter": "ztfr",
        "mag": 17.98,
        "mag_error": 0.05,
        "mag_system": "AB",
        "limiting_mag": 19.49
      }
    ]
  }
}