Folks following this system will want to have a look at the paper on last nights’s astro-ph from Ulisse Munari and gang:
T CrB: overview of the accretion history, Roche-lobe filling, orbital solution, and radiative modeling
Notice the large amount of UBVRI photometry covering a 20-year interval with very high consistency (~0.015 mag). There is also spectroscopy extending well down into the violet.
\Brian
T CrB has over the last weeks rapidly risen back to pre-“dip” magnitudes. A bit brighter in several of the filters. Always be prepared for it to POP! Shake, pull the top, and stand back! 
Jim (DEY)
Right now as I write this, my little Seestar S50 sees T CrB at 9.4…9.5 mag in TG filter, brighter than I’ve ever seen it this year, but for the moment steady at this level. This is consistent with observations logged in the DB from GB at the moment.
So I’m not crying wolf here, yet. I don’t see a rapid rise, just an elevated brightness, but maybe it cannot hurt for people in the US to prepare for observing this episode, for whatever it is, tonite after we in Europe will end our runs.
HB
I’m also watching this curious behavior. Steady rise in “TG” on my Seestar S50. Was up to 9.2 last night?? I’m always questioning, but data looks good. Just submitting this into VPhot now. Looks like we need some more time series…
I’ll probably get out the big Bino’s tonight and look visually. 
My visual observation with a 15 cm Newtonian has T CrB at mag 9.6, as of 21:41UT on 8/8. Seems like activity in the accretion disk is increased.
Hey everybody!
Yes, T CrB is showing off quite a lot. Here’s my latest LC, including yesterday’s observations.
Cheers!
Enrique
(BETB)
Did everyone know there is a nebula around T CrB? 60 parsec diameter. Not directly imaged but UV and spectroscopy used to find it.
Expectation if she ever blows again: Light echos in the nebula! Keep observing…
Jim (DEY)
The nebulosity shows up in GALEX images one can access via Aladin.
Now I have to go look it up… next time make my life easier and just paste the direct link! We are all getting older you know…! 
Jim (DEY)
p.s. Google AI says there are no direct images of this outer faint shell around T CrB. The Galex web site search doesn’t seem to come up with a search match.
p.p.s I’m not convinced GALEX shows any nebulosity. I see a circular region in a far out zoom but that looks more like a noise change boundary, the circular 1.2-deg stare FOV noise reduction is lower due to staring.
Download the Aladin app from SIMBAD, or just use the in-browser Aladin Lite option. Choose to view the GALEX near-UV survey. Ask for the region centered on T CrB. After adjusting the contrast, you will see something like this:
http://spiff.rit.edu/richmond/temp/tcrb_galex.png
(Sorry for using a link – I tried to insert the image itself, but the posting software endlessly stuck on “Processing upload”).
The size of this emitting region corresponds to roughly 60 pc at the distance of T CrB.
Yeah, I saw the inner “circular” ring but I don’t think that is real. It looked like scattered light from the UV optics/sensor system.
Here is what the G-AI says when I ask it, “GALAX scattered light rings around bright objects – T CrB”.
"* The Concentric Halos: T CrB is ringed by prominent, out-of-focus circular halos. This is the exact dichroic beam splitter reflection artifact in action. The intense UV light bounced between the internal instrument windows, casting a wide, ghosted projection of the telescope’s own circular pupil onto the Near-UV (NUV) data track. [1]
Blockquote
What do you think?
Jim (DEY)
p.s. The image says NUV so only the first applies not the FUV radial streaks which are not visible in the NUV image.
I would agree this looks like the normal GALEX instrumental signature. An alternative way of viewing is using the Goddard SkyView utility:
…which allows you to get survey images just about anywhere in the EM spectrum. To explore, I got a 0.7-deg field with visible-light and the GALEX images. (I use the ‘Stern special’ color scheme.) The A-type star BD+26 2766 to the southeast shows a strong halo, as does the F-type star HD 143352 (one of the good T CrB comps) to the northwest. Both halos are the same diameter as the one around T CrB.
\Brian
I stand corrected. Thanks for pointing that out – I should have noticed the halos around other stars, too. Just my luck that the quoted angular size of the T CrB emission is roughly the same angular size as these instrumental artifacts.