[vsnet-alert 25935] Gaia21ccu very bright! (gmag. 12.1 on June 3)

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

Gaia21ccu (submitted to VSX)
 
Kris Stanek (ASAS-SN) reports a huge sudden brightening ("big outburst from a proposed
microlensing event") of Gaia21ccu.
 
A slow brightening started around 2021 March 16 according to ASAS-SN Sky Patrol data:
https://asas-sn.osu.edu/sky-patrol/coordinate/96dbd3ce-59b1-4c4a-ac15-0aa054e1b864
https://asas-sn.osu.edu/sky-patrol/coordinate/ad7b2499-7921-44ae-8ad3-0367ee17327a
 
"Bright gal. plane source candidate microlensing event rises by 0.4 mag":
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21ccu/
 
"No visible emission lines, and the shape of the continuum suggests A/B type star":
https://www.astronomerstelegram.org/?read=14617
https://www.wis-tns.org/object/2021kpk
 
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