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In the present paper, we have reported the result of simultaneousmulti-wavelength observations of the TeV blazar Mrk 421 during February $-$March 2003. In this period, we have observed Mrk 421 using Pachmarhi Array of\v{C}erenkov Telescopes (PACT) of Tata Institute of Fundamental Research atPachmarhi, India. Other simultaneous data were taken from the publishedliterature and public data archives. We have analyzed the high quality X-ray(2-20 keV) observations from the NASA Rossi X-Ray Timing Explorer (RXTE). Wehave seen a possible correlated variability between X-ray and J band (1.25$\mu$) near infrared (NIR) wavelength. This is the first case of X-ray and NIRcorrelated variability in Mrk 421 or any high energy peaked (HBL) blazar. Thecorrelated variability reported here is indicating a similar origin for NIR andX-ray emission. The emission is not affected much by the environment of thesurrounding medium around the central engine of the Mrk 421. The observationsare consistent with the shock-in-jet model for the emission of radiations.

Simultaneous multi-wavelength observations of the TeV Blazar Mrk 421 during February - March 2003: X-ray and NIR correlated variability