V2276 Sgr faded, but will rebrighten
The short duration of the initial outburst appears to be consistent with the AM CVn type.
YYYYMMDD(UT) mag observer 20230705.8343 <16.309g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.8535 <16.794g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.0338 15.834o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.0398 15.785o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.0438 15.930o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.0766 15.947o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.3509 15.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.4367 15.660g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3381 15.626g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1767 15.869g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.3291 15.99C (Masao Funada) 20230710.8540 16.925g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.9285 17.245g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.0488 17.584o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.0520 17.535o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.0576 17.690o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))