Searching for orbital period modulation in X-ray observations of the symbiotic X-ray binary GX 1+4

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Table 1.

Orbital periods from light curves and hardness ratios.

Data set	P_LS (d)	P_EF (d)
Swift_LC	1246 $_{- 48}^{+ 35}$ $^{+35}_{-48}$	1202(32)
MAXI_LC	1259 $_{- 60}^{+ 51}$ $^{+51}_{-60}$	1148(36)
ISGRI_LC	1147 $_{- 5}^{+ 7}$ $^{+7}_{-5}$	1168(24)
MAXI_HR	1110 $_{- 89}^{+ 62}$ $^{+62}_{-89}$	1139(34)

Notes. The first column lists the data-set that was searched for a periodicity. The light curves and hardness ratios are indicated by the subscripts LC and HR, respectively. The second and third column show the periods obtained using the Lomb-Scargle (P_LS) and epoch-folding (P_EF) method. The quoted uncertainties are given at the 68% confidence level.

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