Table 1: Optical and infrared magnitudes of SAX J2103.5+4545.

Optical
Date	B	V	R	I
08/06/03	15.34  0.02	14.22  0.02	13.48  0.02	-
24/08/03	15.36  0.03	14.27  0.02	13.59  0.03	12.87  0.03
Infrared
Date	J	H	K
24/08/03	11.97  0.03	11.42  0.03	11.20  0.03
27/08/03	11.38  0.03	10.90  0.03	10.67  0.03
05/12/03	11.41  0.03	10.97  0.03	10.75  0.03
04/01/04	11.40  0.04	10.96  0.05	10.75  0.04
07/01/04	11.40  0.04	10.94  0.04	10.71  0.03