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GCN Circular 34579

GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
2023-08-27T19:53:53Z (9 months ago)
Mohammad Odeh at Al Khatim Observatory M44 <>
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Mohammad Odeh, Osama Ghannam, Anas Mohammad, Khalfan Al-Noaimy, and Sameh
Al-Ashi, report on behalf of Al-Khatim Observatory (AKO) operated by the
International Astronomical Center in Abu Dhabi, UAE:

We observed ZTF23abaanxz (AT 2023qxj) discovered by ZTF (M. L. Li et al.,
GCN 34574) in the localization region of the Fermi GRB230827.256 (trigger
No 714809315), with our 0.36m f/7.7 robotic telescope. The observation was
done on 27 August 2023 starting from 18:12 (UT), about 12 hours after the
GRB trigger.

We obtained multiple 180-sec exposures in Ic and R filters. We detected the
candidate at the position reported by (M. L. Li et al., GCN 34574) and
confirmed by (Swain et al., GCN 34576).

The following observations were calculated using the Atlas catalogue as a
ObsTime (mid), t(mid) – t(0) (hours), Exposure (sec), Filter, Mag
2023-08-27T18:31:42Z, 12.4, 13 x 180s (stacked), Ic, 18.2 +/- 0.21

2023-08-27T19:19:30Z, 13.2, 16 x 180s (stacked), R, 19.1 +/- 0.23

The magnitudes are not corrected for galactic extinction.

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