GCN Circular 39654
Subject
GRB 250309B / AT2025dws: KMTNet-CTIO optical observations
Date
2025-03-10T16:46:17Z (4 days ago)
From
Min-Su Shin at Korea Astronomy and Space Science Institute <msshin@kasi.re.kr>
Via
Web form
Min-Su Shin (Korea Astronomy and Space Science Institute; KASI),
Jae-Woo Kim (KASI), and Seo-Won Chang (Seoul National University)
report on behalf of the KMTNet neutrino ToO program:
We observed the area corresponding to the neutrino event IceCube-250309A
with the KMTNet-CTIO for the initial coordinates of Zegarelli et. al, GCN 39631.
The KMTNet-CTIO observation started at 2025-03-09 09:44 (UTC), and
we acquired I-band images for four pointings covering the entire
90% uncertainty area for the alert. The source AT2025dws
(Stein et al., GCN 39639, Pérez-Fournon et al. GCN 39643,
Moskvitin et al. GCN 39645, Perley et al. GCN 39646)
is clearly found in the images with the following photometric measurements:
MJD mag err
60743.40574 17.88 0.02
60743.40723 17.87 0.02
We thank the KMTNet operators for their support.