GCN Circular 39622
Subject
GRB 250306A: EIRSAT-1 GMOD detection
Date
2025-03-08T19:48:12Z (5 days ago)
From
Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>
Via
Web form
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:
EIRSAT-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)
The GMOD detection was made starting at 2025-03-06 16:30:05.7 UTC.
The GMOD light-curve for GRB250306A with 1.2s binning shows two distinct pulses consistent with the observation seen by Swift-BAT.
The spacecraft location at the time of detection was 37.285 S, 98.479 E, at an altitude of 439.15 km.
The GMOD light curve for this event can be found here:
https://grb.eirsat1.ie/250306A/250306A_LC_onboard_preliminary.png
EIRSAT-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.