GCN Circular 31750
Subject
GRB 220310A: [KAO-Egypt] SDSS r, i observation
Date
2022-03-13T08:17:39Z (2 years ago)
From
Ahmed Fouad at NRIAG <ahmed.fouad@nriag.sci.eg>
Ahmed M. Fouad, Ali Takey, Mona Molham, Saad Ata, Ola Ali (NRIAG)
report:
We observed the optical counterpart of GRB 220310A
(H. Negoro et al., GCN 31725)
using a 1.88-m telescope at the Kottamia Astronomical Observatory (KAO),
NRIAG, Egypt.
The source was visible at the position discovered by
(V. Lipunov et al., GCN 31732)
where the SDSS galaxy (ObjID: 1237667910586532614) is located.
KAO observations started from 22:05:22 to 23:06:00 UT on 10-03-2022,
~ 21.5 hrs after the MAXI/GSC trigger.
The combined images of 10 x 150sec were created for SDSS r,i images.
We report the preliminary photometry as:
--------------------------------------------------------
Object / r-mag / r-err / i-mag / i-err
-------------------------------/------------/-----------/------------/---------
GRB220310A by KAO / 19.723 / 0.141 / 19.727 / 0.090
Published SDSS-gal. / 21.94 / 0.19 / 21.62 / 0.22
-------------------------------------------------------------------------------
Aperture photometry was done based on 9 stars around the GRB in
a FoV = 8' x 8', selected from the SDSS-DR16.
The magnitude is not corrected for Galactic extinction
in the direction of the GRB.