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tokens: given in Table 1 . Positive time lag hints that the radio emission precedes the X-ray emission but the lag is consistent with zero within Gaussian dispersion. Table 1. Best-fitting parameters of the Gaussian function fitted to the DCF in Fig. 3 according to equation ( 4 ). A is the amplitude of the Gaussian, T is the time-lag, and represents the width. The error in brackets of time-lag T represent the fit errors. Although using a conservative approach, the error on time-lag is given by the Gaussian width, . To further analyse the data, we work with the detrended light curves. The fractional variability amplitude of the radio frequencies is and that of the X-ray is . The normalized detrended flux for both the radio and X-ray emission (normalized with respect to the maximum flux density in their respective light curves) are shown in the top panel of Fig. 4 and a zoom-in of the same for the 5 h simultaneous observations is shown in the bottom panel of Fig. 4 . There is variability with varying amplitude. Qualitatively, the variability at both radio frequencies seems to coincide with the variability in the X-rays (see Fig. 4 ). We perform the cross-correlation analysis using the simultaneous X-ray and radio data of the detrended light curves. Fig. 5(a) shows the cross-correlation between the two radio bands. The DCF peaks at around zero time lag with a coefficient of 0.30 ± 0.04. There is also a correlation at negative time lag of 2.0 ± 0.1 h and positive time lag of 1.7 ± 0.1 h with DCF coefficients of 0.10 ± 0.04 and 0.13 ± 0.04, respectively. These secondary peaks hint at a possible periodicity in the radio data. The cross-correlation between the detrended radio and X-ray data is shown in Fig. 5(b) . The DCF of radio band with X-ray peaks around zero lag with a coefficient of 0.36 ± 0.10. The same DCF pattern is also evident when we correlate the X-ray data with the two independent radio bands (Figs 5c and d ). The DCF of both radio bands with X-ray peaks around zero lag with a coefficient of 0.45 ± 0.10 and 0.42 ± 0.10 for 13–15.5 GHz/0.3–10 keV and 15.5–18 GHz/0.3–10 keV, respectively. Figure 4. Detrended and normalized light curves for comparison. Top: For the entire duration of the observations of about 11 h with 13–15.5 GHz, 15.5–18 GHz, and 0.3–10 keV represented by the red circles, the black squares, and the blue diamonds, respectively. Bottom: Zoom-in of the light curves only for the simultaneous radio and X-ray observations of 5 h. Figure 5. Discrete cross-correlation of detrended light curves of (a) 15.5–18 and 13–15.5 GHz with secondary peaks representing possible periodicity, (b) 13–18 GHz/0.3–10 keV, (c) 13–15.5 GHz/0.3–10 keV, and (d) 15.5–18 GHz/0.3–10 keV. All correlations peak around zero time-lag. The blue-dotted line represents correlation coefficient of zero. As mentioned earlier, the radio and X-ray light curves show variability. The 5 h simultaneous observations of radio and X-ray data do not reveal significant features in