Table 1: BeppoSAX observation log of Mkn 421.
Date Start UT End UT LECS exp. (s) MECS exp. (s) PDS exp. (s) PDS count rate1 (s-1)
1997/04/29 04:02 14:42 11 562  23 283  18 388 0.21 $\pm$ 0.04
1997/04/30 03:19 14:42 11 379  23 975  22 079 0.16 $\pm$ 0.06
1997/05/01 03:17 14:42 11 171  23 713  21 748 0.13 $\pm$ 0.06
1997/05/02 04:10 09:41  4417  11 368  10 594 0.31 $\pm$ 0.08
1997/05/03 03:24 09:41  4326  11 672  10 734 0.10 $\pm$ 0.08
1997/05/04 03:25 09:45  4880  12 177  11 168 0.16 $\pm$ 0.08
1997/05/05 03:32 09:45  4971  11 911  10 946 <0.08
1998/04/21-22 01:52 03:13 23 620  29 547  26 676 0.51 $\pm$ 0.05
1998/04/23-24 00:27 06:37 27 188  34 656  30 923 0.41 $\pm$ 0.05
1998/06/22-23 07:16 02:21 11 279  32 516  27 824 0.45 $\pm$ 0.05
1999/05/04-08 18:16 03:21 62 868 121 813 114 693 0.14 $\pm$ 0.02
2000/04/26-/05/03 17:36 02:13 140 374  127 7022 151 251 3.34 $\pm$ 0.03
2000/05/09-12 04:09 07:06 70 070 139 376 131 768 2.55 $\pm$ 0.02
1 15-90 keV energy band.
2 MECS not operating in the second half of the observation.

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