GRB 230217A: AGILE/MCAL detection
Abstract
The AGILE satellite detected the short GRB 230217A at T0 = 2023-02-17 21:53:10.87 (UTC), reported by Fermi/GBM (GCN #33338) and Swift BAT (GCN #33339). The burst is clearly visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV), and in all the panels of the AntiCoincidence detectors (AC Top, 50-200 keV; AC Lat, 80-200 keV). The event lasted about 2 s and it released a total number of 7554 counts in the MCAL detector (above a background rate of 529 Hz), and 38605 counts in the AC Top detector (above a background rate of 3530 Hz). The AGILE ratemeters light curves can be found at: http://www.agilescienceapp.it/notices/GRB230217A_AGILE_RM_ND.png . The event also triggered a high-time resolution MCAL data acquisition, from T0-0.7 s to T0+5.8 s (UTC), and released 2515 counts in the detector, above a background rate of 776 Hz. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB230217A_082311_603755590.000000.png . The time-integrated spectrum of the burst between T0-1s and T0+1s, fitted in the energy range 0.4-10 MeV with a p.l. with ph. ind. = -2.12 (+/-0.08) resulting in a reduced chi-squared of 0.92 (48 d.o.f.) and a fluence of 4.05e-06 ergs/cm^2 (90% confidence level), in the same energy range. At the T0, the event was 59 deg off-axis. Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2023
- Bibcode:
- 2023GCN.33343....1C