{
  "bibcode": "2024GCN.36778....1G",
  "createdOn": 1719593093481,
  "submittedHow": "web",
  "submitter": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
  "circularId": 36778,
  "format": "text/plain",
  "body": "B. Grefenstette (Caltech) reports on behalf of the NuSTAR Search for INteresting Gamma-ray Signals (SINGS) working group:\n\nThe NuSTAR SINGS working group reports the detection of prompt emission from the Long GRB 240627A in both the NuSTAR CsI anti-coincidence shields. The NuSTAR CsI shield data are recorded at 1 Hz. This GRB was identified through a blind search using the CsI shield rates. Details of the search algorithm will be described in a future paper.\n\nThe NuSTAR SINGS algorithm triggered at 2024-06-27 23:58:55 (with a resolution ~5-seconds). This is consistent with the Astrosat CTZI detection (Waratkar et al, GCN circ. 36776).  The GRB appears to be composed of main peak (at 2024-06-27 23:58:59) along with several additional (potentially unresolved) peaks. The duration of the event is roughly 15-s, which is consistent with the T90 from Astrosat. Peak rates are around 3,500 cps (typical background rates are 1,000 cps).\n\nThere is a simultaneous marginal detection in the CdZnTe detectors, resulting in a net of a <20 excess counts.\n\nLightcurves and analysis for this GRB can be found here:\n\nhttps://nustarsoc.caltech.edu/NuSTAR_Public/grbs/reports/2024/240627A/\n\nInformation on NuSTAR SINGS can be found here: \n\nhttps://nustarsoc.caltech.edu/NuSTAR_Public/grbs/\n\nNuSTAR is a NASA Small Explorer mission led by Caltech and managed by JPL for NASA’s Science Mission Directorate in Washington. \n",
  "eventId": "GRB 240627A",
  "subject": "GRB 240627A: NuSTAR Detection of the long GRB"
}