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
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
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
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)
T CrB observers - the coordinated (but unlikely to be strictly simultaneous - that's ok) observations with HST and XMM-Newton are currently scheduled for February 1 and 2, respectively. Please monitor its brightness (particularly in the B band), first to assure HST people that it's safe to observe T CrB (i.e., it's not too bright), second to put the current activity level in the context of the long-term AAVSO light curve, and finally to limit any changes in T CrB between the HST and XMM observations.
Any spectroscopy would also be welcome.
Thanks - Koji, Paul, Juan, and Jeno
Unfortunately, another technical issue with the HST observation of T CrB has forced them to postpone it, hopefully by just a couple of weeks but not sure when the new date will be. XMM is also following suit. WIll keep you updated as I learn more.
Thanks - Koji
After many a false start, the coordinated X-ray and UV observations of T CrB are currently scheduled as follows.
X-rays with XMM-Newton: 2002-03-08 01 UT to 19 UT.
UV with HST: March 10 or 11.
I hope that, this time, things will go well, and thanks again for all your observations that will help us put thise data in the proper context.
Koji, Paul, Juan, and Jeno
T CrB observers,
Thank you all for your continued monitoring of this fascinating object.
We're going to have another set of coordinated HST/XMM-Newton observations coming up at the end of the month.
The HST observation is scheduled just after midnight on July 30th UTC. The XMM-Newton observation is scheduled between July 29 17:47 UT and July 30 09:35 UT.
Please continue to monitor T CrB - AAVSO data have been very important in reassuring the HST people in particular that the object can be safely observed with HST (which won't be the case should it go into its next recurrent nova eruption).
Koji, Paul, Juan & Jeno