GRB 220310A: MAXI/GSC detection
Abstract
The MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray transient source at 2022-03-10T00:27:57 UT. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (168.612 deg, 23.451 deg) = (11 14 26, +23 27 03) (J2000) with a 90% C.L. statistical error of 0.16 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: (168.038, 23.325) deg = (11 12 09, +23 19 29) (J2000) (168.176, 23.093) deg = (11 12 42, +23 05 34) (J2000) (169.335, 23.670) deg = (11 17 20, +23 40 12) (J2000) (169.197, 23.903) deg = (11 16 47, +23 54 10) (J2000) The X-ray flux averaged over the scan was 348 +- 37 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 3/9 22:55 UT with an upper limit of 20 mCrab.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- March 2022
- Bibcode:
- 2022GCN.31725....1N