GRB 240107A: MAXI/GSC detection
Abstract
The MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray transient source at 19:15:47 UT on January 7, 2023. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (298.014 deg, -68.228 deg) = (19 52 03, -68 13 39) (J2000) with a 90% C.L. statistical error of 0.41 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 114 +- 24 mCrab (4.0-10.0keV, 1 sigma error). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners: (R.A., Dec) = (296.278, -67.736) deg = (19 45 06, -67 44 09) (J2000) (R.A., Dec) = (296.022, -68.496) deg = (19 44 05, -68 29 45) (J2000) (R.A., Dec) = (303.762, -68.679) deg = (20 15 02, -68 40 44) (J2000) (R.A., Dec) = (303.766, -67.913) deg = (20 15 03, -67 54 46) (J2000) There was no significant excess flux in the previous transit at 17:42 UT and in the next transit at 20:48 UT with an upper limit of 20 mCrab for each.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2024
- Bibcode:
- 2024GCN.35495....1K