GRB 230111A: MAXI/GSC detection
Abstract
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 19:07:37 UT on 11 Jan 2023. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (320.188 deg, -30.577 deg) = (21 20 45, -30 34 36) (J2000) with a 90% C.L. statistical error of 0.22 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners. (319.214, -30.721) deg = (21 16 51, -30 43 15) (J2000) (319.406, -31.127) deg = (21 17 37, -31 07 37) (J2000) (321.653, -30.323) deg = (21 26 36, -30 19 22) (J2000) (321.454, -29.920) deg = (21 25 48, -29 55 12) (J2000) The X-ray flux averaged over the scan was 230 +- 30 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 17:34 UT and in the next transit at 20:40 UT with an upper limit of 20 mCrab for each.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2023
- Bibcode:
- 2023GCN.33157....1S