TITLE:   GCN CIRCULAR
NUMBER:  31624
SUBJECT: IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
DATE:    22/02/21 18:38:56 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team, and

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, report:

The long-duration GRB 220219B
has been detected by Konus-Wind (KW) and Swift (BAT), so far,
at about 34045 s UT (09:27:25).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a Konus-BAT annulus centered at
RA(2000)=314.433 deg (20h 57m 44s) Dec(2000)=-14.987 deg (-14d 59' 15"),
whose radius is 83.789 +/- 1.439 deg (3 sigma).

This localization may be improved.

The position of the optical transient ZTF22aabjpxh/AT2022cva
(Ho et al., GCN Circ. 31619) is inside the annulus at 0.46 deg
from its center line. The OT position is consistent with the Swift-BAT 
detection, Fermi-GBM non-detection, and the KW ecliptic latitude response.

The positional and temporal coincidence of this burst with the OT 
supports the conclusion that the OT is the GRB counterpart.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB220219_T34045/IPN

The time history and spectrum will be given in forthcoming GCN Circulars.