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GCN Circular 34576

Subject
GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
Date
2023-08-27T18:35:09Z (9 months 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/.
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