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Table A.1

Observations used in this study.

XMMSL1 name Instrument ObsID Datea Texp (s) b

J005953.1+314934 Einstein MPC 2619 1980-01-10 2211
ROSAT RASS 1991-01-01 462
ROSAT PSPC WG701087P.N1 1992-07-18 4292.8
XMMSL1 9038500002 2002-01-15 8.8
XMM EPIC pn 0312190101 2006-01-24 11193
Swift XRT 00035243 2006-05-29 – 2006-05-31 31181
Suzaku 704025010 2010-01-06 – 2010-01-07 91000
Swift XRT 00040300 2011-02-07 – 2011-08-29 3444
J015510.9-140028 ROSAT PSPC RASS 1991-01-01 468
ROSAT PSPC rp600005n00 1992-01-15 15850
XMMSL1 9075100004 2004-01-15 6.0
Swift XRT 00040302 2010-06-06 – 2010-09-14 1610
J020303.1-074154 ROSAT RASS 1991-01-01 400
XMMSL1 9075000006 2004-01-14 4.7
XMM EPIC pn 0411980201 2006-07-03 10828
Swift XRT 00035746001 2007-06-03 3270
Swift XRT 00035746002 2008-03-02 3668
Swift XRT 00040304001 2010-03-01 2422
J024916.6-041244 ROSAT PSPC RASS 1991-01-01 238
XMMSL1 9084700002 2004-07-25 1.90
XMM EPIC pn 0411980401 2006-07-14 9865
Swift XRT 00035748002,3 2006-12-06 – 2006-12-07 959
Swift XRT 00035748004 2007-01-26 649
Swift XRT 00035748005 2007-06-27 3054
Swift XRT 00040306001,2,3 2010-06-13 – 2011-03-08 2145
Swift XRT 00040306004,5 2015-03-03 – 2015-03-06 2812
J034555.1-355959 ROSAT RASS 1991-01-01 70
ROSAT PSPC rp800300n00 1992-08-27 1217
ROSAT PSPC rp800300a01 1993-01-26 3600
ROSAT PSPC rp190499n00 1997-02-06 2005
XMMSL1 9156600004 2008-06-28 6.4
XMMSL1 9186200002 2010-02-07 5.2
Swift XRT 00040307001 2010-12-22 – 2010-12-23 2361
J044347.0+285822 ROSAT RASS 1991-01-01 454
XMMSL1 9058800004 2003-02-24 3.8
XMM EPIC pn 0401790101 2007-03-18 10042
Swift XRT 00040308001 2010-07-27 1806
J045740.0-503053 ROSAT RASS 1991-01-01 400
XMMSL1 9049100003 2002-08-14 4.5
XMMSL1 9102600004 2005-07-16 8.3
XMMSL1 9188000003 2010-03-16 8.3
Swift XRT 00040309001 2010-11-06 2284
Swift XRT 00040309002,3,5 2013-04-05 – 2013-05-11 5100
J051935.5-323928c ROSAT RASS 1991-01-01 505
Swift campaign 35234 2005-10-29 – 2005-11-26
XMMSL1 0312190701 2006-01-28 8726
XMMSL1 9124900007 2006-10-05 6.4
Suzaku 703014010 2008-04-11 83410
XMMSL1 9179700004 2009-10-01 5.66
XMMSL1 9196400008 2010-08-31 7.41
Swift campaign 31868 2010-11-15 – 2011-01-21
Swift XRT 00040311001,2 2011-01-07 – 2011-01-23 2309
J064541.1-590851 ROSAT RASS 1991-01-01 645
XMMSL1 9126300002 2006-11-01 3.5
XMMSL1 9143600003 2007-10-13 6.2
XMMSL1 9159400002 2008-08-22 8.4
XMMSL1 9195100003 2010-08-04 7.3
Swift XRT 00040315001,2 2010-12-22 – 2010-12-26 2455
XMMSL1 9241500003 2013-02-15 1.0
XMMSL1 9255200003 2013-11-15 6.1
J070841.3-493305c ROSAT RASS 1991-01-01 171
ROSAT rp180306n00 1998-12-09 9472
XMM EPIC pn 0110890201 2000-10-21 40700
XMM EPIC pn 0148010301 2002-10-13 78000
XMMSL1 9109200003 2005-11-25 2.9
XMM campaign 0506200201-501 2007-05-16 – 2007-07-06
XMMSL1 9143400002 2007-10-09 9.3
XMM campaign 0511580101-1201 2008-01-29 – 2008-02-06
XMM campaign 0653510301-601 2010-09-13 – 2010-09-19
Swift campaign 90393 2010-04-03 – 2010-12-19
Swift XRT 00040317001 2010-12-22 1569
XMM EPIC pn 0554760801 2011-01-12 96000
Swift campaign 90393 2010-12-23 – 2011-01-25
Swift XRT 00040317003 2011-01-27 476
Swift campaign 90393 2011-01-28 – 2011-03-29
XMMSL1 9207000003 2011-03-30 6.9
Swift campaign 91623 2013-05-20 – 2013-06-19
Swift campaign 80720 2014-05-05 – 2014-06-28
J082753.7+521800 ROSAT RASS 1991-01-01 449
XMMSL1 9106500003 2005-10-02 8.4
Swift XRT 00040320001 2010-03-11 2159
J090421.2+170927 ROSAT RASS 1991-01-01 310
ROSAT PSPC rs931424n00 1991-11-18 4170
XMMSL1 9126300002 2006-11-01 4.6
Swift XRT 00040322001 2010-06-12 1794
J093922.5+370945 ROSAT RASS 1991-01-01 470
XMMSL1 9081300003 2004-05-18 7.7
XMM Epic pn 0411980301 2006-11-01 5038
Swift XRT 00035747001 2007-09-21 6554
Swift XRT 00040325001,2 2011-03-28 – 2011-05-11 1846
J100534.8+392856 ROSAT RASS 1991-01-01 481
XMMSL1 9107400003 2005-10-21 1.0
Swift XRT 00040326001 2011-01-31 2058
Swift XRT 00040326004 2013-04-23 3654
J104745.6-375932 ROSAT RASS 1991-01-01 362
XMMSL1 9073500003 2003-12-14 7.6
XMMSL1 9173700002 2009-06-03 9.1
Swift XRT 00040328001,2 2010-04-11 – 2010-04-16 2288
J111527.3+180638d ROSAT RASS 1991-01-01 383
XMMSL1 9072400006 2003-11-22 8.0
XMM EPIC pn 0411980101 2006-06-23 5017
Swift XRT 00035745001 2006-12-01 5773
XMM EPIC pn 0556090101 2008-12-02 41734
Swift XRT 00040332001,2 2010-10-23 – 2010-11-16 2614
Swift XRT 00084368001,2 2014-07-17 – 2014-10-23 5936
J112841.5+575017 ROSAT RASS 1991-01-01 519
XMMSL1 9107500006 2005-10-23 10.5
XMMSL1 9116700004 2006-04-24 5.5
Swift XRT 00040333001 2011-03-28 1872
Swift XRT 00040333002,3,4 2013-04-10 – 2013-10-19 6196
J113001.8+020007 ROSAT RASS 1991-01-01 427
XMMSL1 9109400004 2005-11-29 6.7
XMMSL1 9165400002 2008-12-20 4.6
XMMSL1 9183300003 2009-12-13 5.9
Swift XRT 00040334001,2 2011-01-26 – 2011-01-31 2041
J121335.0+325609 ROSAT RASS 1991-01-01 502
ROSAT rp600130n00 1991-11-24 16310
XMMSL1 9072500005 2003-11-24 9.0
Swift campaign 55300 2006-06-02 2910
Swift campaign 55300 2006-06-09 – 2006-06-12 4369
Swift campaign 55300 2006-06-27 1814
XMMSL1 9155100004 2008-05-29 10.1
Swift XRT 00040335001 2010-10-19 1589
Swift XRT 00040335002 2011-07-06 398
J132342.3+482701 ROSAT RASS 1991-01-01 560
XMMSL1 9072900002 2003-12-01 8.6
XMM EPIC pn 0411980501 2006-07-15 5018
Swift XRT 00035749001 2007-01-11 3854
Swift XRT 00035749002 2007-05-26 1922
Swift XRT 00040336001 2011-02-04 1819
J162553.4+562735 ROSAT RASS 1991-01-01 1035
XMMSL1 9100800002 2005-06-10 5.8
XMMSL1 9131700004 2007-02-17 4.0
Swift XRT 00040345001,2 2010-07-10 – 2010-07-11 3753
Swift XRT 00040345004,5 2013-04-08 – 2013-04-14 3987
J173739.3-595625d ROSAT RASS 1991-01-01 165
XMMSL1 9123400007 2006-09-05 2.9
XMMSL1 9151100003 2008-03-10 5.5
Swift XRT 00037391001 2008-05-04 1958
Swift XRT 00037705001 2008-06-03 2671
Swift XRT 00037705002 2008-07-10 553
Swift XRT 00037391002 2008-07-21 5001
Swift XRT 00037391003 2008-07-29 3359
Swift XRT 00037705004 2008-11-02 2078
Swift XRT 00040349001 2013-03-18 125
Swift XRT 00040349002,3 2013-10-12 – 2013-10-18 1747
J183521.4+611942 ROSAT RASS 1991-01-01 2270
XMMSL1 9100300002 2005-05-31 1.0
XMMSL1 9149600002 2008-02-09 8.4
XMMSL1 9173900002 2009-06-08 10.1
Swift XRT 00040352001 2011-02-04 1914
Swift XRT 00040352003,4,5,6 2013-06-16 – 2013-07-24 2970
J193439.3+490922 ROSAT RASS 1991-01-01 823
XMMSL1 9072800002 2003-11-30 9.2
XMMSL1 9100700002 2005-06-08 8.2
XMMSL1 9127200003 2006-11-19 4.8
Swift XRT 00040353002,3,4,5 2011-11-24 – 2012-09-15 2237

Notes. Swift observations taken specifically for this programme are marked with .

(a)

For the ROSAT all-sky survey, 1991-01-01 is assumed as an approximate observation date for all observations.

(b)

The exposure time for the XMM-Newton slew observations is given for the total energy band. There is a small difference, due to the energy-dependent vignetting, when considering the soft or hard band only.

(c)

Numerous observations from other campaigns are available, many are shown in the light curve. Here we only list ROSAT, XMM and our Swift observations.

(d)

In addition there are Chandra observations which are not considered here.

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