GCN Circular 34205
Subject
GRB 230707A: Swift/BAT-GUANO position correction
Event
Date
2023-07-12T01:58:42Z (3 years ago)
From
Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>
Aaron Tohuvavohu (U Toronto), Dmitry Svinkin (Ioffe Institute) report:
The prior reporting of the arcminute localization of GRB 230707A (GCN 34159) is incorrect.
The GRB signal detected and localized by BAT-GUANO is real, and correctly localized to arcminute precision in the instrument frame.
However, an incorrect spacecraft attitude quaternion was used for conversion from instrument to celestial coordinates.
The corrected BAT position for this burst is:
RA, Dec = 173.1992 -16.4121, which is:
RA (J2000) 11h 32m 47.81s
Dec (J2000) -16d 24' 43.6"
with an estimated uncertainty of 2 arcminutes.
This position is 5.35 degrees from the position reported in GCN 34159.
I apologize for the error, and gratefully acknowledge the critical support from IPN teammates in identifying this discrepancy.
The source of the error has been identified and corrections will be implemented.
Previous BAT localizations have not been affected by this error.