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Analysis of rapid variability at 4.85 GHz for the BL BLac object 0925+504 ispresented and discussed. The structure functions (SF) are investigated withboth refractive and weak interstellar scintillation (RISS/WISS) modelsanalytically. Parameters obtained with these models are quantitativelycompared, suggesting that the emission region of IDV is remarkably compact andthe responsible interstellar scintillation medium (ISM) lies very close to theobserver. Furthermore possible evidence of annual modulation of the variabilitytimescales is detected in this source. Our findings indicate that the observedrapid variability in 0925+504 is predominantly caused by a scattering screenlocated along the line of sight to the source, at a distance of $\sim 110\,pc$to the observer.

Rapid variability of BL Lac 0925+504: interstellar scintillation induced?