IPN triangulation of GRB 240209A
Abstract
The long-duration GRB 240209A (Fermi-GBM detection: The Fermi GBM team, GCN 35712; Malacaria et al., GCN 35729) was detected by Fermi (GBM trigger 729152364) and Konus-Wind, in the waiting mode, at about 22760 s UT (06:19:20). We have triangulated it to a Konus-GBM annulus centered at RA(2000)=119.672 deg (07h 58m 41s) Dec(2000)=+19.090 deg (+19d 05' 25"), whose radius is 66.074 +/- 14.729 deg (3 sigma). The annulus combined with the Fermi-GBM final position (GCN 35712; glg_healpix_all_bn240209263_v01) gives ~2019 sq. deg (3 sigma) localization region. The reported optical counterpart candidate GOTO24pw/AT2024cew (Belkin et al., GCN 35715) is outside the Konus-GBM annulus, implying that the optical transient is unrelated to the GRB. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240209_T22759/IPN
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2024
- Bibcode:
- 2024GCN.35751....1S