Swift Trigger 1014012 (possible GRB 201221C) is likely not an astrophysical event
Abstract
Using the full data set from recent downlinks, we report further ground data analysis for Swift trigger 1014012 (Page et al. GCN Circ. 29106). The BAT analysis uses data from T-239 to T+963 sec. The BAT image significance has now decreased to 5.2 sigma (15-350 keV). Also, the mask-weighted light curve does not show anything significant. There is no good evidence for an X-ray source in 4.7 ks data, to a 3 sigma upper limit of 2.3x10^-3 count s^-1 (corresponding to an observed flux of 1x10^-13 erg cm^-2 s^-1, assuming a typical power-law spectrum). We therefore conclude that this event is likely due to noise, and is not an astrophysical event.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2020
- Bibcode:
- 2020GCN.29138....1B