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GCN Circular 33620

Subject
GRB 230414B: 1.3m DFOT Optical observations
Date
2023-04-14T20:31:18Z (a year ago)
From
Ankur Ghosh at ARIES <ghosh.ankur1994@gmail.com>
Ankur Ghosh, Dimple, Kuntal Misra, Rahul Gupta, Amit K Ror, Amar Aryan, and
Shashi B. Pandey (ARIES) report:


We observed the field of GRB 230414B detected by *Swift* (D'Ai et al. 2023,
GCN 33612) using the 1.3m Devasthal Fast Optical Telescope (DFOT) located
at the Devasthal observatory of Aryabhatta Research Institute of
Observational Sciences (ARIES), Nainital, India. We have taken multiple
frames with an exposure time of 300 seconds in several passbands. We
clearly detected the GRB afterglow within the enhanced *Swift*-XRT error
circle (Evans et al. 2023, GCN 33613) in each image. The estimated
preliminary magnitude is the following:


Date_Start_UT       T_start-T0 (days)    Filter     Exp time (sec)
 magnitude

==============================================================

2023-04-14 17:13:30    ~ 0.041               R               300
  20.06 +/- 0.06


The detection of the GRB afterglow is consistent with Lu et al. 2023, GCN
33616, Pankov et al. 2023, GCN 33617, and Raman et al. 2023, GCN 33618.


The magnitude is not corrected for the Galactic and host extinction in the
direction of the GRB afterglow. Photometric calibration is performed using
the standard stars from the USNO-B1.0 catalog.
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