We carried out further analysis of the AGILE/MCAL data of GRB 210410A (GCNs #29777, #29778, #29779, #29780, #29781, #29782, #29786, #29787, #29788, #29790, #29793, #29797). The first 4 s of the burst released 5700 counts in the detector, above a background rate of 560 Hz. The spectral analysis shows a clear component up to 100 MeV. The time-integrated spectrum of the first ~4 s of the burst can be fitted in the energy range 0.4-100 MeV with a CPL model with alpha = -0.6 -0.25/+0.14 and cutoff energy Ec = 500 keV, plus an extra PL component with ph.ind. -1.31 -0.04/+0.04. The fit results in a reduced chi-squared of 1.48 (81 d.o.f.) and a fluence of 1.3e-04 ergs/cm^2 (90% confidence level), in the same energy range. We divided the data acquisition into three time intervals: interval a [T0-0.16s - T0+0.70s], interval b [T0+0.70s - T0+2.85s], and interval c [T0+2.85s - T0+4.00s]. The spectral analysis in the energy range 0.4-100 MeV shows an evolution of the PL high-energy spectral component, evolving from alpha = -1.91 to alpha = -0.92. Details are reported below: | model | CPL alpha | Ec | PL ph.ind. | redX^2 (dof) a | CPL+PL | -0.57 -1.46/+3.84 | 438 keV | -1.91 -0.96/+0.78 | 0.97 (81) b | CPL+PL | -0.57 -1.68/+0.67 | 365 keV | -0.98 -0.61/+0.39 | 1.38 (81) c | PL | ----- | --- | -0.92 -0.98/+0.40 | 1.05 (84) MCAL light curve and spectra in the different time intervals can be found at: http://www.agilescienceapp.it/notices/GRB210410A_AGILE-MCAL_intervals.png . 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....
GRB 210410A: AGILE/MCAL analysis / Ursi, A.; Tavani, M.; Verrecchia, F.; Pittori, C.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; Piano, G.; Lucarelli, F.; Bulgarelli, A.; di Piano, A.; Fioretti, V.; Fuschino, F.; Parmiggiani, N.; Marisaldi, M.; Pilia, M.; Trois, A.; Donnarumma, I.; Longo, F.; Giuliani, A.; Agile, Team. - (2021).
GRB 210410A: AGILE/MCAL analysis
di Piano, A.;
2021
Abstract
We carried out further analysis of the AGILE/MCAL data of GRB 210410A (GCNs #29777, #29778, #29779, #29780, #29781, #29782, #29786, #29787, #29788, #29790, #29793, #29797). The first 4 s of the burst released 5700 counts in the detector, above a background rate of 560 Hz. The spectral analysis shows a clear component up to 100 MeV. The time-integrated spectrum of the first ~4 s of the burst can be fitted in the energy range 0.4-100 MeV with a CPL model with alpha = -0.6 -0.25/+0.14 and cutoff energy Ec = 500 keV, plus an extra PL component with ph.ind. -1.31 -0.04/+0.04. The fit results in a reduced chi-squared of 1.48 (81 d.o.f.) and a fluence of 1.3e-04 ergs/cm^2 (90% confidence level), in the same energy range. We divided the data acquisition into three time intervals: interval a [T0-0.16s - T0+0.70s], interval b [T0+0.70s - T0+2.85s], and interval c [T0+2.85s - T0+4.00s]. The spectral analysis in the energy range 0.4-100 MeV shows an evolution of the PL high-energy spectral component, evolving from alpha = -1.91 to alpha = -0.92. Details are reported below: | model | CPL alpha | Ec | PL ph.ind. | redX^2 (dof) a | CPL+PL | -0.57 -1.46/+3.84 | 438 keV | -1.91 -0.96/+0.78 | 0.97 (81) b | CPL+PL | -0.57 -1.68/+0.67 | 365 keV | -0.98 -0.61/+0.39 | 1.38 (81) c | PL | ----- | --- | -0.92 -0.98/+0.40 | 1.05 (84) MCAL light curve and spectra in the different time intervals can be found at: http://www.agilescienceapp.it/notices/GRB210410A_AGILE-MCAL_intervals.png . 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....
Pubblicazioni consigliate
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris
