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GCN Circular 32771

Subject

GRB 221009A: Faulkes Telescope North continued optical afterglow follow-up

Date

2022-10-16T21:35:11Z (2 years ago)

From

Manisha Shrestha at University of Arizona <mshrestha1@arizona.edu>

M. Shrestha (Univ. of Arizona), K. Bostroem (Univ. of Arizona),  D. Sand (Univ. of Arizona), K. D. Alexander (Univ. of Arizona), J. Andrews (Gemini), J. Pearson (Univ. of Arizona), G. Hosseinzadeh (Univ. of Arizona), N. Smith (Univ. of Arizona), D. A. Howell (LCO/UCSB), C. McCully (LCO/UCSB), M. Newsome (LCO/UCSB), E Padilla Gonzalez (LCO/UCSB), C. Pellegrino (LCO/UCSB), G. Terreran (LCO/UCSB), J. Farah (LCO/UCSB) report on behalf of a wider Global Supernova Project collaboration:



We observed the field of Swift GRB 221009A (Dichiara et al. GCN 32632Not found
 
 
 ) with Faulkes Telescope North, on 2022 October 15 starting at 6:34:12.198 UT (~5.7 days after the trigger) using the MuSCAT3 imager in the r, i, and z bands.  Data were calibrated with respect to nearby PanSTARRS sources for r, i, and z bands .



We clearly detect the optical counterpart in the r, i and z bands and obtain an upper limit on the g band. The magnitudes are as follows:



r  = 21.13 +- 0.06

i  = 20.01 +- 0.05

z = 19.39 +- 0.05



These values are not corrected for galactic extinction and are consistent with the magnitudes reported in Belkin et al. GCN 32769Not found
 
 
 observed in a similar time frame.