T CrB observing campaign

American Association of Variable Star Observers (AAVSO)
Tue, 08/03/2021 - 16:54

AAVSO Alert Notice 750 announces an observing campaign on the recurrent nova T CrB. Please see the notice for details and observing instructions.

There are threads for this campaign under the following forums:

- Campaigns and Observation Reports: https://www.aavso.org/t-crb-campaign-2021-2022
- Novae: https//www.aavso.org/t-crb-campaign-2021-2022-01
- Spectroscopy: https//www.aavso.org/t-crb-campaign-2021-2022-02

Please subscribe to these threads if you are participating in the campaign so you can be updated by the astronomer and by HQ. Join in the discussion or ask questions there!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

American Association of Variable Star Observers (AAVSO)
XMM and HST observations coming up soon


Thank you for continuing to observe T CrB, despite the excitement over RS Oph!

The XMM and HST observations of T CrB are scheduled within the next week: XMM observation is scheduled Aug 23 at 09:20 UT through Aug 24 at 03:07 UT, then HST observation follows on Aug 26.  The AAVSO data have been essential in reassuring the people at Space Telescope Science Institute that T CrB has not gone into an outburst and therefore it is safe for HST to observe it.

Please keep observations coming!

Thanks - Koji

American Association of Variable Star Observers (AAVSO)
Update: HST observation will be re-done


The XMM observation of T CrB was successful, but there was a technical issue with the HST observation, and we ended up with no usable data. Since it was a technical issue and not our fault, they are going to re-do the observations. We don't know the schedule yet - however, please keep observing T CrB at a high cadence for the foreseeable future.

Thanks - Koji Mukai

American Association of Variable Star Observers (AAVSO)
HST observation update

The HST folks have decided that it was not possible to schedule a replacement observation this fall. So here is the updated status/schedule of our XMM-Newton/HST observations of T CrB:

(1) X-ray observation no. 1 - August 2021 with XMM-Newton (done); no (successful) contemporaneous UV observation.

(2) X-ray observation no. 2/UV observation no. 1 - January/Feburary 2022. Detailed schedule TBD.

(3) UV observation no. 3 - later in 2022 with HST. No more XMM-Newton observation, but we will try to get some X-ray coverage with Swift.

Observers - thank you for your corperation. With the postponement of HST observation, there is less urgency from our side, although T CrB remains a high-value target . More importantly, we're approaching the least favorable season to observe T CrB.

I'll be back later in the year or very early next year, to give you an update on the scheduling of XMM-Newton  observation no.2/HST observation no. 1.

Thanks - Koji (for Paul, Jeno and Juan)