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GCN Circular 33286

Subject
GRB 230205A: LCOGT Optical Upper Limits
Date
2023-02-06T16:21:38Z (a year ago)
From
Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>
R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on
behalf of a larger collaboration:

We observed the GRB 230205A (Ambrosi et al., GCN 33271) field with the
LCOGT 1-meter Sinistro instrument at the McDonald Observatory, TX, USA
site, on February 6, from 11:51 to 12:23 UT (corresponding to 25.20 to
25.52 hours from the GRB trigger time) with the SDSS r and i filters.

We performed a series of 3x300s exposures in each band.  We do not detect a
source in either band within the XRT enhanced error region (Goad et al.,
GCN 33275) consistent with other optical upper limits (Hu et al., GCN
33274; Turpin et al., GCN 33282; Wu et al., GCN 33283).

The following magnitudes and upper limits are calculated using the
PanSTARRS catalog as reference:

r > 21.2
i > 20.8

These magnitudes are not corrected for galactic extinction.
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