Long and short term variability of seven blazars in six near-infrared/optical bands

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Table 8

Rapid event time scales.

Source	Filter	MJD	N	Linear fitting		Exponential fitting

				τ	τ _ck	τ _r	τ _d	reduced χ²

PKS 0537-441	V	53 619	198	11h53min ± 16min	34d17h22min ± 1h56min	1h27min ± 6h48min	12min24s ± 8min13s	1.13

PKS 2155-304	H	55 837	10	2h15min ± 22min	1d7h3min ± 22h16min		22min ± 1h30min	4.60
	R	53 678	25	11h54min ± 25min	6d10h34min ± 1d23h48min		1h21min ± 39min	5.78
	V	53 678	31	12h00min ± 21min	7d16h28min ± 3d17h44min		1h39m ± 39min	1.16
	V	53 973	10	2h15min ± 14min	3d17h33min25s ±1d11h40min		3min14s ± 2min1s	1.79

Notes.The exponential fits refer to Eq. (3). For the episodes related to PKS 2155-304, in Eq. (3) τ_r is assumed equal to τ_d.

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