TITLE: GCN CIRCULAR NUMBER: 37314 SUBJECT: GRB 240825A: ALMA detection DATE: 24/08/28 01:28:11 GMT FROM: Tanmoy Laskar at U of Utah tanmoylaskar@gmail.com
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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