TITLE:   GCN CIRCULAR
NUMBER:  34416
SUBJECT: GRB 230812B: Faulkes Telescope North optical afterglow follow-up 
DATE:    23/08/14 14:17:45 GMT
FROM:    Manisha Shrestha at University of Arizona <mshrestha1@arizona.edu>

M. Shrestha (Univ. of Arizona), D. Sand (Univ. of Arizona), K. D. Alexander (Univ. of Arizona), J. Andrews (Gemini), K. Bostroem (Univ. of Arizona),  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 230812B (Fermi GBM GCN 34386) with Faulkes Telescope North, on 2023-08-14 at 5:50:39 UT (60170.2435 MJD, ~1.45 days after the trigger) using the MuSCAT3 imager in the g,r, and i bands.  Data were calibrated with respect to nearby SDSS sources.
 
We clearly detect the optical counterpart in the g,r, and i bands. The magnitudes are as follows: 
g = 21.38 +- 0.07
r  = 20.81 +- 0.04
i  = 20.71 +- 0.07

These values are not corrected for galactic extinction.