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GCN Circular 33618

Subject
GRB 230414B: GROWTH India Telescope afterglow confirmation
Date
2023-04-14T17:56:54Z (a year ago)
From
Varun Bhalerao at Indian Inst of Tech <varunb@iitb.ac.in>
D. Raman (IITB), A. Suresh (IITB), V. Swain (IITB), H. Kumar (IITB), G. Waratkar(IITB), V. Bhalerao (IITB), G.C. Anupama(IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed the field of GRB 230414B detected by Swift ( A. D'Ai et al., GCN 33612) with 0.7m GROWTH-India Telescope (GIT). GIT automatically triggered at 16:17:41 UT, i.e., 3.3 min after the Swift/BAT trigger. We obtained frames in the r' and i' band of 120 sec each. We detected an uncatalogued source at RA 12:04:22.65, Dec: 53:09:15.4 with an uncertainty of 1.9 arcsec. There is no minor planet present at this position. The photometric results follow as:
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JD (mid) | T_mid-T0 (min) | Filter | Magnitude (AB) |

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2460049.18505852 | 12.13 | r' | 19.45 +/- 0.08 |

2460049.18674811 | 14.56 | r' | 19.47 +/- 0.08 |
2460049.19372952 | 24.62 | r' | 19.91 +/- 0.09 |
2460049.18854398 | 17.15 | i' | 19.08 +/- 0.13 |
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The results are consistent with (T.H. Lu et al., GCN #33616; N. Pankov et al., GCN #33617).We encourage photometric for further confirmation and spectroscopic follow-up for redshift measurement. The magnitudes are 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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