Searching for the 511 keV annihilation line from galactic compact objects with the IBIS gamma ray telescope

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Table 3

511 keV 2σ Sgr A* upper flux limit in the Galactic center visibility periods.

Period	Start time	End time	No. ScWs^a	Sgr A* Exposure^b	Flux limit
	(UT)	(UT)		Ms	10^-4 ph cm^-2 s^-1

2003 Spring	2003-02-28	2003-04-23	1731	0.650	5.7
2003 Autumn	2003-08-10	2003-10-14	1717	1.872	3.2
2004 Spring	2004-02-16	2004-04-20	1862	1.046	4.5
2004 Autumn	2004-08-17	2004-10-27	2191	1.292	4.3
2005 Spring	2005-02-16	2005-04-28	2144	1.165	4.7
2005 Autumn	2005-08-16	2005-10-26	1667	0.790	5.9
2006 Spring	2006-02-09	2006-04-25	1869	1.501	4.1
2006 Autumn	2006-08-16	2006-11-02	1770	1.080	5.0
2007 Spring	2007-02-01	2007-04-22	985	0.347	9.2

Notes.

^(a)

Each ScW lasts about half an hour.

^(b)

Obtained from the exposure map. The exposure map, and in particular the value in the Galaxy depends both on the number of ScWs and the dithering patterns.

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