{
  "bibcode": "2025GCN.39622....1D",
  "subject": "GRB 250306A: EIRSAT-1 GMOD detection",
  "submittedHow": "web",
  "eventId": "GRB 250306A",
  "createdOn": 1741463292934,
  "submitter": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
  "format": "text/plain",
  "circularId": 39622,
  "body": "C. de Barra, D. Murphy, C. McKenna, A. Ulyanov, P. McDermott, G. Finneran,  M. Doyle, R. Dunwoody, J. Mangan, G. Corcoran, L. Cotter, A. Empey, J. Fisher, F. Gibson Kiely, J. Thompson, D. McKeown, A. Martin-Carrillo, L. Hanlon, S. McBreen, on behalf of the EIRSAT-1 team: \n\nEIRSAT-1 reports the detection of the long gamma-ray burst GRB250306A by the Gamma-ray Module (GMOD) instrument, which was also detected by Swift BAT (GCN 39606), AstroSat CZTI (GCN 39611), and NuSTAR (GCN 39616)\n\nThe GMOD detection was made starting at 2025-03-06 16:30:05.7 UTC.\n\nThe GMOD light-curve for GRB250306A with 1.2s binning shows two distinct pulses consistent with the observation seen by Swift-BAT.\n\nThe spacecraft location at the time of detection was 37.285 S, 98.479 E, at an altitude of 439.15 km.\n\nThe GMOD light curve for this event can be found here: \n\nhttps://grb.eirsat1.ie/250306A/250306A_LC_onboard_preliminary.png \n\nEIRSAT-1 is Ireland’s first satellite (Doyle et al. Proceedings of the 4th SSEA, 2022). It is a 2U CubeSat and carries onboard a number of experiments including the Gamma-Ray Module (GMOD), a novel, compact, gamma-ray detector (Murphy et al, Experimental Astronomy, 53, 961–990, 2022). GMOD consists of a 25 mm × 25 mm × 40 mm Cerium Bromide scintillator coupled to SiPMs and is designed to detect gamma-ray bursts in the ~ 60 keV - 1.5 MeV range. EIRSAT-1 was developed in University College Dublin with support from ESA’s Fly Your Satellite! programme and was launched on 1st December 2023.\n\n"
}