GCN Circular 44563
Subject
GRB 260509A: SAO RAS optical observations
Event
Date
2026-05-11T18:46:55Z (4 days ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
Web form
A. Moskvitin and O. Spiridonova (SAO RAS),
report on behalf of the GRB follow-up team.
We observed the field of the GRB 260509A (Götz et al., GCN 44504)
with the Zeiss-1000, 1m telescope of the SAO RAS equipped
with the CCD photometer. We obtained 12 * 300 sec. images in Rc
band on May 10, 18:18:31--19:49:52 UT (21.22 hr after the trigger).
The OT (O'Neill et al., GCN 44505; Saccardi et al., GCN 44506;
Wu et al., GCN 44507; Sánchez Álvarez et al., GCN 44509;
Zheng et al., GCN 44510; Kechin et al., GCN 44512;
Belkin, GCN 44513; Corcoran et al., GCN 44514;
Bochenek and Perley, GCN 44516) is marginally detected with the
brightness of R = 24.0 +/- 0.3.
This preliminary photometry is based on nearby stars from the USNO-B1
catalogue (R2 magnitudes) and is not corrected for the Galactic
extinction.