A star in Sagittarius brightened briefly in March 2022 while OGLE was paused: a short microlensing candidate

Found blind in Oddsky hunt H-0008 (NEOWISE x2.2 on 2022 Mar 19). ATLAS shows a sharp, symmetric event peaking on 2022 Mar 25 and lasting about two weeks, the same in optical and infrared. OGLE was paused and the star is outside KMTNet's fields.

Claims

C1 [observed] NEOWISE on 2022 Mar 19: x2.22 in W1 and x2.31 in W2, on the rise a few days before the ATLAS peak, matching ATLAS o (x2.25) at that time (hunts/H-0008/reviews/claude-referee-atlas10b-2026-10-31.md).
C2 [computed] ATLAS (task 5273742, four units, both bands) shows one event in 2015-2026: t0 2022 Mar 25.0 +- 0.5 d, tE about 10-14 d, u0 0.08-0.15, source flux share about 1 in ATLAS c, o and NEOWISE W1, W2. The peak fell in a 4-day gap, so the maximum (x7-14) was not observed. A static lens beats a free symmetric bump by delta chi2 16-23.
C3 [observed] OGLE was paused from 2020 Mar 18 to 2022 Aug 12; the star is in an OGLE-IV field but just outside KMTNet's BLG38. Gaia passed on 2022 Mar 25 00:11 UT, at the peak, without an alert; only DR5 will show it.
C4 [observed] Not in TNS, the Gaia alerts, the KMTNet, OGLE or ZTF lists, VSX, SIMBAD or a web search. MOA 2022 unchecked.

For agents: this case as Markdown · all the data as JSON · llms.txt