GCN Circular 32227
Subject
GRB 220617A: TNG optical observations
Event
Date
2022-06-19T12:17:15Z (3 years ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
P. D'Avanzo (INAF-OAB), S. Piranomonte (INAF-OAR), S. Campana (INAF-OAB), V. D'Elia (ASI/SSDC),
L. Di Fabrizio, A. Garcia De Gurtubai Escudero (INAF-TNG) on behalf of the CIBO collaboration report:
We observed the field of the short GRB 220617A (Fermi-GBM detection: Fermi GBM Team, GCN Circ 32209;
Fermi-LAT detection: Di Lalla et al., GCN Circ 32212; IPN detection: Kozyrev et al., GCN Circ. 32220) with the
Italian 3.6m TNG telescope equipped with the optical camera DOLORES. A series of images were obtained with
the r-sdss filter on 2022-06-18 from 21:22:18 UT to 22:09:26 UT (i.e. at a mid time of about 1.14 days after the burst).
The pointing enabled to image the location of the Swift-XRT sources #3 and #4 (Page et al., GCN Circ. 32215),
both consistent with the Fermi/LAT error circle.
No clear afterglow candidate is detected within the error circles of XRT sources #3 and #4 down to a typical limiting
magnitude of r ~ 24.5 (AB; calibrated against the SDSS catalogue).
We note the presence of catalogued galaxies from the SDSS within the error circles of the XRT sources #3 and #4:
XRT3
- SDSS J102809.40+152924.9 (photo-z = 0.102 +/- 0.031)
- SDSS J102809.54+152915.8 (photo-z = 0.381 +/- 0.083)
XRT4
- SDSS J102757.23+152645.6 (photo-z = 0.714 +/- 0.116)