HERMES: Gamma-ray burst and gravitational wave counterpart hunter

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Volume 689 (September 2024)

A&A, 689 (2024) A175

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Table 2.

GRB detection rates.

	LONG				SHORT
	Total	S	X	X-only	Total	S	X	X-only

HP	$195_{- 21}^{+ 22}$ $195^{+22}_{-21}$	$147_{- 11}^{+ 13}$ $147^{+13}_{-11}$	$131_{- 19}^{+ 17}$ $131^{+17}_{-19}$	$51_{- 13}^{+ 12}$ $51^{+12}_{-13}$	$19_{- 3}^{+ 5}$ $19^{+5}_{-3}$	$19_{- 3}^{+ 5}$ $19^{+5}_{-3}$	$0 . 3_{- 0.2}^{+ 0.4}$ $0.3^{+0.4}_{-0.2}$	< 0.1
Const. A	$1565_{- 244}^{+ 292}$ $1565^{+292}_{-244}$	$772_{- 61}^{+ 67}$ $772^{+67}_{-61}$	$1517_{- 251}^{+ 289}$ $1517^{+289}_{-251}$	$796_{- 204}^{+ 221}$ $796^{+221}_{-204}$	$191_{- 28}^{+ 40}$ $191^{+40}_{-28}$	$188_{- 28}^{+ 38}$ $188^{+38}_{-28}$	$7_{- 4}^{+ 5}$ $7^{+5}_{-4}$	< 3
Const. B	$2468_{- 452}^{+ 531}$ $2468^{+531}_{-452}$	$996_{- 64}^{+ 119}$ $996^{+119}_{-64}$	$2455_{- 460}^{+ 529}$ $2455^{+529}_{-460}$	$1473_{- 375}^{+ 419}$ $1473^{+419}_{-375}$	$327_{- 61}^{+ 78}$ $327^{+78}_{-61}$	$322_{- 58}^{+ 76}$ $322^{+76}_{-58}$	$18_{- 10}^{+ 8}$ $18^{+8}_{-10}$	< 7

Notes. Number of events per year expected with HERMES (HP and Constellation) for the short and long classes. For each GRB class, the table reports the total rate and the partial rates on the single instruments (S – all events detected by S; X – all events detected by X; X-only – all events detected only by the X instrument). The difference in configurations A and B for the Constellation is the FoV of the single satellite (see Table 1).

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