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GCN Circular 41466

Subject
GRB 250821A: LCOGT Optical Upper Limits
Event
GRB 250821A
Date
2025-08-21T13:14:26Z (2 days ago)
From
Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>
Via
email
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:

We observed the Swift GRB 250821A field (Dichiara et al., GCN 41462)  with the LCOGT 1-meter Sinistro instrument at the Siding Spring Observatory, Australia site, on August 21, from 12:00 to 12:32 UT (corresponding to 1.23 to 1.76 hours after the GRB trigger time) with the SDSS r and i filters.

We performed a series of 3x300s exposures in i-band and r-band.  We do not detect an uncatalogued source within the Prompt Swift XRT error region (Evans et al., GCN 41463) in either band.

The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:

r > 23.0
i > 22.3

These magnitudes are not corrected for galactic extinction.
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