(cba:news) Fwd: CRTS J135716.8-093238 (X-ray "nova"): new outburst? (Apr. 10)

[Joe Patterson]

Hi CBAers,

Here's a great new object for long, all-latirude-and-longitude 
observation.  Outburst confirmed by ZTF in ATel 14539.

AM CVn season is not yet over - we want to continue through May.  But we 
have very high-quality timings of the orbital signal (as well as the two 
superhumps, of course) - so the need for *long* nightly time series has 
passed.  I'd give the X-ray transient priority over HP Lib, too - 
although the latter is definitely of high interest.

Thanks, Patrick!

joe


-------- Forwarded Message --------
Subject: 	CRTS J135716.8-093238 (X-ray "nova"): new outburst? (Apr. 10)
Date: 	Sat, 10 Apr 2021 18:14:10 +0000 (UTC)
From: 	Patrick Schmeer <extpasc at yahoo.de>
To: 	Gregory Sivakoff <sivakoff at ualberta.ca>, David Buckley 
<dibnob at saao.ac.za>, Koji Mukai <koji.mukai-1 at nasa.gov>, Joe Patterson 
<jop at astro.columbia.edu>



Hi Greg, David, Koji, and Joe,

As in 2017 and 2019, spring has begun, and CRTS J135716.8-093238
= SWIFT J1357.2-0933 goes into outburst (confirmation required).

Best wishes,
Patrick
-------
----- Weitergeleitete Nachricht -----
*Von:* Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>
*An:* "vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp" 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; 
"vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp" 
<vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>; 
"vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp" 
<vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp>; "cvnet-outburst at groups.io" 
<cvnet-outburst at groups.io>; "baavss-alert at groups.io" 
<baavss-alert at groups.io>
*Gesendet:* Samstag, 10. April 2021, 20:05:06 MESZ
*Betreff:* [vsnet-alert 25703] CRTS J135716.8-093238 (X-ray "nova"): new 
outburst? (Apr. 10)

CRTS J135716.8-093238 = SWIFT J1357.2-0933  (LMXB/BHXB/XN)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=252812 
<https://www.aavso.org/vsx/index.php?view=detail.top&oid=252812>

My regular check of the web page
https://lasair.roe.ac.uk/object/ZTF19aanxwrq/ 
<https://lasair.roe.ac.uk/object/ZTF19aanxwrq/>
revealed an apparent brightening:
CRTSJ135716.8-093238 20210410.3803 18.69g ZTF

The previous (dwarf nova-like) outburst was recorded from
2019 March 31 to July 28 by ZTF, see also
https://www.astronomerstelegram.org/?read=12796 
<https://www.astronomerstelegram.org/?read=12796>

That outburst had started around 2019 March 20, see
https://www.astronomerstelegram.org/?read=12803 
<https://www.astronomerstelegram.org/?read=12803>

Complete ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/bd13a4ad-5978-45c4-9043-ca9616f8a971 
<https://asas-sn.osu.edu/sky-patrol/coordinate/bd13a4ad-5978-45c4-9043-ca9616f8a971>

Confirmation of the current outburst and follow-up
observations are required.

Clear skies,
Patrick
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References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
- Shappee et al., 2014ApJ...788...48S
- Kochanek et al., 2017PASP..129j4502K
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M

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