VRI photometry of the type Ia supernova 2002bo is presented .
This SN exploded in a dusty region of the host galaxy NGC 3190 , thus , subtraction of a template frame was necessary to obtain reliable photometry .
We used a template frame of NGC 3190 taken during the course of our galaxy imaging project , fortunately , just a few days before SN 2002bo was discovered .
The aim of this project is to collect template frames of nearby galaxies that are potential hosts of bright SNe .
Subtraction of pre-SN images helped us to exclude the background light contamination of the host galaxy .
The maximum occurred at JD 2452346 , with maximal V brightness of 13 \aas@@fstack { m } 58 .
MLCS analysis led to T _ { 0 } ( B ) =JD 2452346.1 \pm 0.8 ( fiducial B-maximum ) , E ( B - V ) =0 \aas@@fstack { m } 24 \pm 0 \aas@@fstack { m } 02 , \mu _ { 0 } = 32.46 \pm 0.06 , \Delta = -0.14 \pm 0.04 . E ( B - V ) =0 \aas@@fstack { m } 24 ( 2 ) indicates a significant extinction in the host galaxy as the galactic reddening is negligible toward NGC 3190 .
The accepted value of \Delta indicates that SN 2002bo was a slightly overluminous SN by about 0 \aas@@fstack { m } 14 relative to fiducial SN Type Ia .
The distance turned out to be 31.0 \pm 3 Mpc .
In addition , the heavily obscured SN 2002cv was also detected on the I frame taken on JD 2452434 ( June 8 , 2002 ) , and a variable star is found in the field , very close to the host galaxy .