GRB 230827.256
GCN Circular 34576
Subject
GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
Date
2023-08-27T18:35:09Z (2 years ago)
From
Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>
Via
Web form
V. Swain, A Salgundi, R. Kumar, R. Sharma, H. Kumar, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed ZTF23abaanxz/AT2023qxj discovered by ZTF (M. L. Li et al., GCN 34574) in localization region of the Fermi GRB230827.256 (trigger No 714809315), with the 0.7m GROWTH-India Telescope (GIT). The observations started at 15:04:47 UT on 2023-08-27, roughly 8.9 hours after the Fermi GBM trigger. We obtained a 300s exposure in the r' filter. We clearly detected the candidate at the position reported by M. L. Li et al., GCN 34574. The photometric results are follow as:
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jd (mid) | Filter | Total Exposure (s) | Magnitude (AB) |
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2460184.13030952 | r' | 300 | 19.3 +/- 0.1 |
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We confirm that the object is still fading, thereby confirming it as an afterglow. The magnitude is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.
The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN Circular 34579
Subject
GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
Date
2023-08-27T19:53:53Z (2 years ago)
From
Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>
Via
legacy email
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
reference:
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ObsTime (mid), t(mid) – t(0) (hours), Exposure (sec), Filter, Mag
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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
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The magnitudes are not corrected for galactic extinction.