{
  "createdOn": 1743462864980,
  "bibcode": "2025GCN.39989....1M",
  "submitter": "David Murphy at University College Dublin <david.murphy@ucd.ie>",
  "eventId": "GRB 250330B",
  "format": "text/markdown",
  "subject": "GRB 250330B: EIRSAT-1 GMOD Detection",
  "submittedHow": "web",
  "circularId": 39989,
  "body": "D. Murphy, J. Fisher, C. de Barra, P. McDermott, C. McKenna, A. Ulyanov, G. Finneran, G. Corcoran, L. Cotter, A. Empey, 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 short gamma-ray burst GRB 250330B by the Gamma-ray Module (GMOD) instrument, which was also detected by Fermi GBM (GCN [39951](https://gcn.nasa.gov/circulars/39951)). The GMOD detection was made starting at 2025-03-30 21:52:22.4 UTC.\n\nThe GMOD light curve for GRB250330B, with 1.2s binning, shows a single peak, consistent with the detection by Fermi GBM.\n\nThe spacecraft location at time of detection was 1.704 S, 7.769 E and an altitude of 407.7 km.\n\nThe light curve for this event as measured by GMOD can be found here: https://grb.eirsat1.ie/250330B/250330B_LC_onboard_preliminary.png\n\nEIRSAT-1 is Ireland’s first satellite ([Doyle et al. Proceedings of the 4th SSEA, 2022](https://researchrepository.ucd.ie/bitstreams/2f3fdccb-6e36-4ac1-88cd-4e80feecf446/download)). 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](https://link.springer.com/article/10.1007/s10686-022-09842-z)). 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."
}