Kavli Affiliate: Michael M. Fausnaugh
| First 5 Authors: Michael M. Fausnaugh, Rahul Jayaraman, Roland Vanderspek, George R. Ricker, Christopher J. Burke
| Summary:
We present the TESS light curve of GRB 230307A. We find two distinct
components: a bright, prompt optical component at the time of the Fermi
observation that peaked at TESS magnitude 14.49 (averaged over 200 seconds),
followed by a gradual rise and fall over 0.5 days, likely associated with the
afterglow, that peaked at 17.65 mag. The prompt component is observed in a
single 200s Full Frame Image and was undetectable in the next TESS image
($T_{rm mag} > 17.79$). Assuming that the onset of the optical transient was
coincident with the gamma-ray emission, the prompt emission lasted less than
73.6 seconds, which implies the true peak was actually brighter than $T_{rm
mag} =$ 13.40. We also fit parametric models to the afterglow to characterize
its shape. The TESS light curve can be retrieved at
https://tess.mit.edu/public/tesstransients/light_curves/lc_grb230307A_cleaned.txt.
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