GCN Circular 36137
Subject
GRB 240414A: AbAO optical upprer limit
Date
2024-04-16T14:12:25Z (8 months ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Via
legacy email
N. Pankov (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI),
S. Belkin (IKI) report on behalf of GRB-IKI-FuN:
We observed the field of GRB 240414A (Caputo et. al., GCN 36083) at
redshift z=1.833 (Adami et al., GCN 36085; de Ugarte Postigo et al., GCN 36087) with 70-cm AS-32 telescope of Abastumani Observatory (AbAO). The observations were started on 2024-04-14 (UT) 22:06:33, i.e. ~20 hr since the Swift trigger. We took 117 frames 60 sec each in the R-filter. The optical counterpart (Schneider et al., GCN 36084; Adami et al., GCN 36085; de Ugarte Postigo et al., GCN 36087; Niwano et al., GCN 36088; Lipunov et al., GCN 36095; Dutton et al., GCN 36097; Peretto, GCN 36100; Turpin et al., GCN 36101; Karambelkar et al., GCN 36103; Odeh et al., GCN 36111; Pankov et al., GCN 36113; Siegel & Caputo, GCN 36115; de Ugarte Postigo et al., GCN 36117; Xiong et al., GCN 36130; Wang et al., GCN 36131; Lopresti et al., GCN 36133) is not detected in the stacked image of 113x60 sec. Preliminary photometry is following:
Date UT_start t-T0 Filter Exp. OT err UL(3sigma)
(mid, days) (s)
2024-04-14 22:06:33 0.86281 R 113*60 n/d n.d 21.4
The magnitudes were calibrated with nearby USNO-B1.0 stars.
The result is in agreement with observations carried out by other groups, in particular, with (de Ugarte Postigo et al., GCN 36117) at the similar epoch.