GCN Circular 30545
Subject
GRB 210726A: OSIRIS/GTC observations
Date
2021-07-29T12:54:52Z (4 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC,
DARK/NBI), C. Thoene, M. Blazek, J. F. Agui Fernandez (all
HETH/IAA-CSIC), J. P. U. Fynbo (DAWN/NBI), L. Izzo (DARK/NBI), N. R.
Tanvir (U. Leicester), and G. Gomez Velarde (GRANTECAN) report:
We observed the XRT afterglow position (Osborne et al., GCN #30524) of
GRB 210726A (Bernardini et al., GCN #30523), classified as a short GRB
(Tohuvavohu, GCN #30535; Palmer et al., GCN #30536; Veres, GCN #30540)
with OSIRIS mounted on the 10.4m Gran Telescopio Canarias (Observatorio
Astrof��isco Roque de Los Muchachos, La Palma, Canary Islands, Spain),
under mediocre conditions and at high airmass, starting July 26,
21:21:31 UT, 2.041 h after the GRB. We obtained a sequence of 30, 30,
60, 30 s images in r' for a total integration time of 150 s.
Within the XRT error circle, we do not detect any source down to r' >
24.4 mag (AB magnitude), measured against a nearby PanSTARRS fiel star,
at 0.088533 d (2.125 h) after the burst, in agreement with Kann et al.,
GCN #30543.
The possible host galaxy (Watson et al., GCN #30534, Kann et al., GCN
#30543) is found at r' = 22.04 +/- 0.05 mag, again in agreement with
detections from the PanSTARRS and SDSS surveys.