Table 1: Calibration stars in the GRB 021004 field, marked in Fig. 1.
U B V R

1 $17.37\pm0.03$ $17.34\pm0.03$ $16.70\pm0.01$ $16.33\pm0.01$

2 $18.54\pm0.04$ $17.43\pm0.03$ $16.26\pm0.01$ $15.54\pm0.02$

3 $20.70\pm0.04$ $19.48\pm0.02$ $17.90\pm0.02$ $17.06\pm0.02$

4 -- $21.12\pm0.11$ $19.74\pm0.04$ $18.78\pm0.06$

5 -- $19.76\pm0.03$ $18.29\pm0.02$ $17.36\pm0.03$

6 $16.49\pm0.05$ $15.51\pm0.03$ $14.44\pm0.05$ $13.88\pm0.06$

7 $18.10\pm0.02$ $18.09\pm0.01$ $17.49\pm0.01$ $17.14\pm0.01$

8 $17.83\pm0.16$ $17.61\pm0.02$ $16.71\pm0.01$ $16.20\pm0.02$

9 $14.71\pm0.09$ $14.62\pm0.08$ $13.97\pm0.05$ $13.62\pm0.08$

10 $17.62\pm0.06$ $17.84\pm0.03$ $17.32\pm0.01$ $17.00\pm0.01$

I J H K

1 $15.95\pm0.02$ $15.48\pm0.07$ $15.16\pm0.10$ $14.90\pm0.14$

2 $14.90\pm0.03$ $14.06\pm0.03$ $13.47\pm0.03$ $13.36\pm0.05$

3 $16.08\pm0.05$ $15.01\pm0.04$ $14.46\pm0.06$ $14.18\pm0.08$

4 $17.83\pm0.06$ -- -- --

5 $16.46\pm0.03$ $15.41\pm0.06$ $14.72\pm0.06$ $14.44\pm0.10$

6 $13.39\pm0.07$ $12.56\pm0.02$ $12.07\pm0.02$ $11.95\pm0.02$

7 $16.79\pm0.03$ $16.33\pm0.13$ $15.84\pm0.16$ --

8 $15.70\pm0.03$ $14.96\pm0.04$ $14.43\pm0.05$ $14.61\pm0.11$

9 $13.25\pm0.09$ $12.61\pm0.02$ $12.23\pm0.02$ $12.18\pm0.02$

10 $16.64\pm0.02$ $16.20\pm0.11$ $15.75\pm0.14$ --

**Table 1:** Calibration stars in the GRB 021004 field, marked in Fig. 1.
	U	B	V	R
1	$17.37\pm0.03$	$17.34\pm0.03$	$16.70\pm0.01$	$16.33\pm0.01$
2	$18.54\pm0.04$	$17.43\pm0.03$	$16.26\pm0.01$	$15.54\pm0.02$
3	$20.70\pm0.04$	$19.48\pm0.02$	$17.90\pm0.02$	$17.06\pm0.02$
4	--	$21.12\pm0.11$	$19.74\pm0.04$	$18.78\pm0.06$
5	--	$19.76\pm0.03$	$18.29\pm0.02$	$17.36\pm0.03$
6	$16.49\pm0.05$	$15.51\pm0.03$	$14.44\pm0.05$	$13.88\pm0.06$
7	$18.10\pm0.02$	$18.09\pm0.01$	$17.49\pm0.01$	$17.14\pm0.01$
8	$17.83\pm0.16$	$17.61\pm0.02$	$16.71\pm0.01$	$16.20\pm0.02$
9	$14.71\pm0.09$	$14.62\pm0.08$	$13.97\pm0.05$	$13.62\pm0.08$
10	$17.62\pm0.06$	$17.84\pm0.03$	$17.32\pm0.01$	$17.00\pm0.01$
	I	J	H	K
1	$15.95\pm0.02$	$15.48\pm0.07$	$15.16\pm0.10$	$14.90\pm0.14$
2	$14.90\pm0.03$	$14.06\pm0.03$	$13.47\pm0.03$	$13.36\pm0.05$
3	$16.08\pm0.05$	$15.01\pm0.04$	$14.46\pm0.06$	$14.18\pm0.08$
4	$17.83\pm0.06$	--	--	--
5	$16.46\pm0.03$	$15.41\pm0.06$	$14.72\pm0.06$	$14.44\pm0.10$
6	$13.39\pm0.07$	$12.56\pm0.02$	$12.07\pm0.02$	$11.95\pm0.02$
7	$16.79\pm0.03$	$16.33\pm0.13$	$15.84\pm0.16$	--
8	$15.70\pm0.03$	$14.96\pm0.04$	$14.43\pm0.05$	$14.61\pm0.11$
9	$13.25\pm0.09$	$12.61\pm0.02$	$12.23\pm0.02$	$12.18\pm0.02$
10	$16.64\pm0.02$	$16.20\pm0.11$	$15.75\pm0.14$	--

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data reduction
	3 Brief description of the modelling
	4 Results
	5 Discussion
	6 Conclusions
	References