List of transients observed by nanosatelite

List of transients observed by the GRB detector on the GRBBeta nanosatelite

The list contains gamma-ray transients observed by the GRB detector on GRBBeta [1], [2], [3].
GRBBeta was launched on 9 July 2024, and its description can be found in paper:
Ripa, J., et al. 2026, arXiv:2601.16609

Event type/name denotes the type of the detected event like GRB, Solar flare etc.
Ch. no. is the readout channel number of the detector (0 or 1)
Peak time denotes the time when the detected count rate from the event was maximal
T90 is the time interval, in which 90 per cent of all counts in the given energy band from the event are observed
Peak count rate is the detected count rate of the event at the peak time
Band is the energy range for which the T90 duration and the count rate was calculated
S/N is the maximal significance of the signal detected in any of the energy bands (either in one bin at the peak or integrated over T90)
Raw LC is the raw light curve without the background subtraction
Bkg-sub LC is the light curve with background subtracted
LC res. is the light curve resolution
GCN circ. is the GCN circular number where this detection was reported
References give the list of other instruments which detected the same event

Energies are derived from the pre-launch calibrations. The change of the gain of the detector over the time spent on orbit is not accounted for in these preliminary analyses.

Event type/name	Ch. no.	Peak time (UTC)	T90 [s]	Peak count rate [cnt/s]	Band [keV]	S/N [σ]	Raw LC	Bkg-sub LC	LC res. [s]	GCN circ.	References	Comment
GRB 251209A	0	2025-12-09 13:24:30.23	52.50	378.5	~70-2310	34.4	PNG, EPS, TXT, FITS	PNG, EPS	0.25		Fermi/GBM AstroSat/CZTI
GRB 251113A	0	2025-11-13 17:37:36.34	29.00	151.8	~70-2310	18.4	PNG, EPS, TXT, FITS	PNG, EPS	0.25		Fermi/GBM AstroSat/CZTI Glowbug
GRB 251007A	0	2025-10-07 19:37:54.4	17.2	539.9	~70-2310	33.0	PNG, EPS, TXT, FITS	PNG, EPS	0.2		Swift/BAT Glowbug CALET/CGBM
GRB 251001C	0	2025-10-01 15:07:26.038	0.750	203.1	~70-2310	5.5	PNG, EPS, TXT, FITS	PNG, EPS	0.125		Glowbug CALET/CGBM SVOM/GRM
GRB 250920A	0	2025-09-20 02:54:08.862	9.375	1635.5	~70-2310	43.8	PNG, EPS, TXT, FITS	PNG, EPS	0.125		Fermi/GBM Wind/KONUS AstroSat/CZTI SVOM/GRM NuSTAR
GRB 250919A	0	2025-09-19 00:29:21.882	136.625	3538.1	~70-2310	109.9	PNG, EPS, TXT, FITS	PNG, EPS	0.125		Fermi/GBM Fermi/LAT SVOM/GRM
GRB 250916A	0	2025-09-16 13:33:28.131	59.000	188.1	~70-2310	23.5	PNG, EPS, TXT, FITS	PNG, EPS	0.125		Fermi/GBM CALET/CGBM Wind/KONUS AstroSat/CZTI Glowbug NuSTAR
GRB 250621A	0	2025-06-21 01:14:57.24	10.25	230.3	~70-2310	20.1	PNG, EPS, TXT, FITS	PNG, EPS	0.25		Fermi/GBM
GRB 250620C	0	2025-06-20 16:07:10.24	31.00	1029.4	~70-2310	34.8	PNG, EPS, TXT, FITS	PNG, EPS	0.25		Fermi/GBM
Solar flare	0	2025-06-19 23:46:48.24	29.50	563.2	~70-2310	56.9	PNG, EPS, TXT, FITS	PNG, EPS	0.25		Fermi/GBM
GRB 250612C	0	2025-06-12 14:53:17	1	282.1	~100-2310	13.3	PNG, EPS, TXT, FITS	PNG, EPS	1		Fermi/GBM SVOM/GRM
GRB 250320B	0	2025-03-20 23:15:29.4	13.5	416.3	~70-2310	33.5	PNG, EPS, TXT, FITS	PNG, EPS	0.5		Fermi/GBM AstroSat/CZTI SVOM/GRM NuSTAR
GRB 250320A	0	2025-03-20 06:06:28.9	71.0	273.4	~70-2310	37.1	PNG, EPS, TXT, FITS	PNG, EPS	0.5		Fermi/GBM NuSTAR
GRB 250317C	0	2025-03-17 17:31:24.4	20.5	125.9	~70-2310	13.5	PNG, EPS, TXT, FITS	PNG, EPS	0.5		AstroSat/CZTI GECAM-B SVOM/GRM
GRB 250313A	0	2025-03-13 14:34:40.4	12.0	436.1	~70-2310	41.1	PNG, EPS, TXT, FITS	PNG, EPS	0.5		Fermi/GBM Fermi/LAT Wind/Konus CALET/CGBM AstroSat/CZTI SVOM/GRM GRBAlpha
GRB 250302A	0	2025-03-02 13:47:15	45	44.3	~70-2310	7.3	PNG, EPS, TXT, FITS	PNG, EPS	1		Fermi/GBM
Solar flare	0	2024-07-24 07:34:20	40	220.7	~100-2310	41.1	PNG, EPS, TXT, FITS	PNG, EPS	10		Fermi/GBM Wind/Konus GOES
Solar flare	1	2024-07-24 07:34:30	40	91.3	~90-2390	28.0	PNG, EPS, TXT, FITS	PNG, EPS	10		Fermi/GBM Wind/Konus GOES

Contacts:

Marianna Dafcikova, Jakub Ripa, Norbert Werner, Filip Munz, Filip Hroch

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