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bl lac.jpg

1999 saw BL Lac reach it's brightest magnitude for 30 years, since when several bright 'outbursts' have been seen.

Since 2011 BL Lac has been steadily brightening, culminating in a major 'outburst' during 2020.

 

Left  This light curve displays short term optical variations detected during the large optical and X-ray outburst of 1997

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