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GCN Circular 37314

Subject
GRB 240825A: ALMA detection
Date
2024-08-28T01:28:11Z (a month ago)
From
Tanmoy Laskar at U of Utah <tanmoylaskar@gmail.com>
Via
legacy email
T. Laskar (University of Utah), K. D. Alexander (University of Arizona), C.
Christy (University of Arizona), C. Peña (University of Utah), G. Schroeder
(Northwestern University), E. Berger (Harvard University), R. Chornock (UC
Berkeley), W. Fong (Northwestern University), R. Margutti (UC Berkeley),
and P. Schady (University of Bath) report on behalf of a larger
collaboration:

"We observed GRB 240825A (Gupta et al., GCN 37274) with the Atacama Large
Millimeter/Submillimeter Array (ALMA) at 97.5 GHz beginning on 2024 August
27 03:22 UT (35.5 h after the burst). ALMA observations of this burst were
delayed due to uninterruptible scheduled Cycle 11 software validation at
the Observatory.

Preliminary analysis reveals a mm source with flux density of ~ 0.3 mJy at
position:
RA (J2000) = 22:58:17.27
Dec (J2000) = +01:01:36.73

with uncertainty ~ 0.07" in each coordinate, consistent with the X-ray
position (Evans et al., GCN 37290) and optical position (Gupta et al., GCN
37274; Jiang et al., GCN 37275; Dutton et al., GCN 37276; Odeh et al., GCN
37277; Li et al., GCN 37280; Leonini et al., GCN 37291; Kuin et al., GCN
37296). Further observations are planned.

We thank the JAO staff, AoD, P2G, and the entire ALMA team for their help
with these observations."

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