Table 3: Accepted good exposure time and fraction of total exposure time remaining after filtering out intervals of high background in the full energy band (0.5-7.3 keV). Calculated for each EPIC instrument in each XMM-Newton observation used in XEST. The penultimate column lists the approximate lowest detectable count-rate for a 4 $\sigma$ detection in the PN; for a 30 ks exposure in purely quiescent background, this would be 1.1 c ks^-1. For XEST-26 only the MOS cameras were used and the MOS1 value has been multiplied by a factor 2.7 to calculate a PN-equivalent source count-rate. The final column lists the total number of detections made in the summed EPIC images.
Field M1 M2 PN EPIC

$t_{\rm good}$ Per cent $t_{\rm good}$ Per cent $t_{\rm good}$ Per cent $C_{\rm 4\sigma}$ $N_{\rm det}$

s s s c ks^-1

01 50 215 62.9 50 944 63.9 41 756 57.2 1.06 104

02 39 078 95.4 39 638 96.8 27 895 71.0 1.63 76

03 22 814 65.2 23 908 68.3 15 647 47.1 1.81 37

04 29 722 89.9 29 710 89.9 29 131 95.0 1.19 70

05 24 125 76.3 24 229 76.6 15 963 53.9 1.86 36

06 30 777 97.4 30 894 97.7 27 858 92.9 1.30 103

07 30 013 95.1 30 183 95.6 25 338 84.2 1.29 52

08 35 577 85.6 35 841 86.2 26 699 71.7 1.66 82

09 25 009 79.0 25 170 79.5 19 272 64.3 1.82 81

10 28 597 90.3 28 649 90.5 25 476 84.8 1.31 66

11 34 245 82.5 35 075 84.2 30 972 80.7 1.14 104

12 30 398 97.9 30 451 98.1 28 673 97.4 1.17 90

13 24 561 77.8 24 979 79.1 20 918 70.5 3.11 37

14 28 832 84.6 28 942 84.9 24 173 74.9 1.65 78

15 23 372 75.5 23 475 75.9 19 166 63.1 1.67 84

16 23 864 58.9 25 683 63.3 13 705 40.2 2.54 46

17 26 750 86.7 26 804 86.9 22 898 78.3 1.59 68

18 28 540 90.1 28 654 90.5 26 500 89.8 1.24 66

19 30 235 80.0 30 544 80.8 26 086 75.4 1.29 90

20 31 494 100.0 31 479 100.0 29 877 100.0 1.18 76

21 29 060 74.9 29 094 75.4 18 386 40.4 2.03 75

22 55 031 96.8 54 931 96.6 50 484 92.7 0.76 116

23 57 519 79.9 57 496 79.8 41 190 59.5 1.11 76

24 32 069 72.6 31 991 72.4 24 253 60.2 1.57 63

25 16 411 97.8 16 466 98.1 14 399 94.9 1.84 54

26 124 995 97.4 125 270 97.6 - - 0.81 165

27 37 770 87.3 27 864 87.5 35 416 85.2 1.16 153

28 124 833 95.4 124 951 95.5 120 693 93.1 0.52 199

**Table 3:** Accepted good exposure time and fraction of total exposure time remaining after filtering out intervals of high background in the full energy band (0.5-7.3 keV). Calculated for each EPIC instrument in each *XMM-Newton* observation used in XEST. The penultimate column lists the approximate lowest detectable count-rate for a 4 $\sigma$ detection in the PN; for a 30 ks exposure in purely quiescent background, this would be 1.1 c ks^-1. For XEST-26 only the MOS cameras were used and the MOS1 value has been multiplied by a factor 2.7 to calculate a PN-equivalent source count-rate. The final column lists the total number of detections made in the summed EPIC images.
Field	M1	M2	PN	EPIC
	$t_{\rm good}$	Per cent	$t_{\rm good}$	Per cent	$t_{\rm good}$	Per cent	$C_{\rm 4\sigma}$	$N_{\rm det}$
	s		s		s		c ks^-1
01	50 215	62.9	50 944	63.9	41 756	57.2	1.06	104
02	39 078	95.4	39 638	96.8	27 895	71.0	1.63	76
03	22 814	65.2	23 908	68.3	15 647	47.1	1.81	37
04	29 722	89.9	29 710	89.9	29 131	95.0	1.19	70
05	24 125	76.3	24 229	76.6	15 963	53.9	1.86	36
06	30 777	97.4	30 894	97.7	27 858	92.9	1.30	103
07	30 013	95.1	30 183	95.6	25 338	84.2	1.29	52
08	35 577	85.6	35 841	86.2	26 699	71.7	1.66	82
09	25 009	79.0	25 170	79.5	19 272	64.3	1.82	81
10	28 597	90.3	28 649	90.5	25 476	84.8	1.31	66
11	34 245	82.5	35 075	84.2	30 972	80.7	1.14	104
12	30 398	97.9	30 451	98.1	28 673	97.4	1.17	90
13	24 561	77.8	24 979	79.1	20 918	70.5	3.11	37
14	28 832	84.6	28 942	84.9	24 173	74.9	1.65	78
15	23 372	75.5	23 475	75.9	19 166	63.1	1.67	84
16	23 864	58.9	25 683	63.3	13 705	40.2	2.54	46
17	26 750	86.7	26 804	86.9	22 898	78.3	1.59	68
18	28 540	90.1	28 654	90.5	26 500	89.8	1.24	66
19	30 235	80.0	30 544	80.8	26 086	75.4	1.29	90
20	31 494	100.0	31 479	100.0	29 877	100.0	1.18	76
21	29 060	74.9	29 094	75.4	18 386	40.4	2.03	75
22	55 031	96.8	54 931	96.6	50 484	92.7	0.76	116
23	57 519	79.9	57 496	79.8	41 190	59.5	1.11	76
24	32 069	72.6	31 991	72.4	24 253	60.2	1.57	63
25	16 411	97.8	16 466	98.1	14 399	94.9	1.84	54
26	124 995	97.4	125 270	97.6	-	-	0.81	165
27	37 770	87.3	27 864	87.5	35 416	85.2	1.16	153
28	124 833	95.4	124 951	95.5	120 693	93.1	0.52	199

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