GCN Circular 44456

Subject

GRB 260504B: LCO z-band upper limit

Event

GRB 260504B

Date

2026-05-04T10:38:06Z (5 days ago)

Edited On

2026-05-05T18:03:06Z (3 days ago)

From

SVOM_group <svomgroup@bao.ac.cn>

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov>

Via

Web form

D. Turpin (CEA/Irfu), A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud), L. P. Xin (NAOC), Y. Wang (PMO,CAS; UCB), W. J. Xie (NAO,CAS), report on behalf of the SVOM mission team:

We observed the field of the short GRB 260504B detected by SVOM (Saccardi et al., GCN 44454Loading...
 
 ) with the LCO 1m telescope at Cerro Tololo equipped with the Sinistro instrument.

Our observation started on 2026-05-04 at 09:40:18 UT (about 9 min after the trigger) and we obtained 3x200 s exposures in the Pan-STARRS z filter.

No new source is detected within the ECLAIRs and MXT error circles, down to a limiting magnitude:

z > 19.66 (AB, 5-sigma, mid-time 14.4 min after the SVOM trigger).

This value was calibrated against the SkyMapper survey DR4 and is not corrected for Galactic extinction.

This project is funded by the SVOM collaboration.