Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042

Itoh-san's refined astrometry:

RA 17 55 53.262 DEC -28 16 33.96

The location agrees with that of CX137. This is an outburst from a 0.4-d binary with prominent ellipsoidal variations.

CX137: 175553.262 -281633.96 (2000.0) Gaia_EDR3_4062657359687091584 plx=1.130(0.049) dismod=9.7 pmra=1.164(0.052) pmdec=-6.889(0.035) G=16.223 BP=16.755 RP=15.373

Yamamoto-san reported that it had brightened further in the ASAS-SN data.

https://asas-sn.osu.edu/sky-patrol/coordinate/b4aa63c1-fb92-40c0-96d4-2989b1...

Itoh-san obtained a short time-resolved photometric run (around 12.7 mag). This object may be eclipsing and further observations are recommended.