Table 1: Pulse periods of OAO 1657-415 as measured during the INTEGRAL GPS in 11 observation groups. The date is the centre of the observation time interval.
Grp. Date Range Period $\dot{P}$

[MJD] [d] [s] [10^-9 s s^-1]

1 52 672.03 $\pm$ 0.67 37.1467 (1)

2 52 711.48 $\pm$ 12.87 37.1645 (5) $2.9\pm1.0$

3 52 859.94 $\pm$ 0.18 37.2028 (5)

4 52 869.95 $\pm$ 0.91 37.2005 (5)

5 52 908.42 $\pm$ 0.35 37.2008 (5)

6 53 054.92 $\pm$ 0.07 37.2262 (50)

7 53 232.53 $\pm$ 0.53 37.2712 (2)

8 53 255.48 $\pm$ 0.36 37.2819 (3)

9 53 464.74 $\pm$ 1.63 37.2060 (15)

10 53 650.10 $\pm$ 0.57 37.1137 (7)

11 53 789.58 $\pm$ 5.32 37.1209 (6)

**Table 1:** Pulse periods of OAO 1657-415 as measured during the *INTEGRAL* GPS in 11 observation groups. The date is the centre of the observation time interval.
Grp.	Date	Range	Period	$\dot{P}$
	[MJD]	[d]	[s]	[10^-9 s s^-1]
1	52 672.03	$\pm$ 0.67	37.1467 (1)
2	52 711.48	$\pm$ 12.87	37.1645 (5)	$2.9\pm1.0$
3	52 859.94	$\pm$ 0.18	37.2028 (5)
4	52 869.95	$\pm$ 0.91	37.2005 (5)
5	52 908.42	$\pm$ 0.35	37.2008 (5)
6	53 054.92	$\pm$ 0.07	37.2262 (50)
7	53 232.53	$\pm$ 0.53	37.2712 (2)
8	53 255.48	$\pm$ 0.36	37.2819 (3)
9	53 464.74	$\pm$ 1.63	37.2060 (15)
10	53 650.10	$\pm$ 0.57	37.1137 (7)
11	53 789.58	$\pm$ 5.32	37.1209 (6)

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