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The Blazar (AGN) BL Lac is currently in a bright outburst at 12.6C (Sep 08.027 UT). This is a rise of ~1.5 mags in just four days. Atel #16806 gives some further information.
There is a BAAVSS chart here for visual observers. Photometric tables are available with charts from the AAVSO web site.
Gary
Hi Gary,
I got it last night from Spain in R and V. See attached.
R = 12.97, V = 13.57 (average of 19 measurements)
Cheers
Ian.Attachments:
This looks to be a short duration event, but brightness can change quickly with BL Lac, so it might brighten again. Keep looking!
Gary
Hi Gary,
Last night both R and V were about 0.6 mags brighter than the previous night. See attached.
Averages: R = 12.4, V = 13.0
Cheers
Ian.Attachments:
Thanks Ian. I had 13.2 visual last night, and I also have an unfiltered Slooh image which I haven’t measured yet.
Gary
Hi Gary,
A tad brighter last night, see attached.
R = 12.3, V = 12.9
Cheers
Ian.Attachments:
Gamma ray observations from Fermi LAT show enhanced gamma ray emissions on Oct 5
https://www.astronomerstelegram.org/?read=16849Gamma ray light curve: https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/BL_Lac
LHAASO also reports gamma ray flaring on Oct 5: https://www.astronomerstelegram.org/?read=16850
Looking at the AAVSO light curve, it was ca 0.5 mag brighter in BVRI (13.2V) on Oct 6 compared to Oct 3.
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