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GCN Circular 26564

GRB 191221B: ALMA detection
2019-12-22T22:36:28Z (4 years ago)
Tanmoy Laskar at U of Bath <>
T. Laskar (University of Bath), W. Fong (Northwestern), K. D. Alexander
(Northwestern), E. Berger (Harvard), S. Bhandari (CSIRO), G. Hosseinzadeh
(Harvard), R. Margutti (Northwestern), C. G. Mundell (University of Bath),
and P. Schady (University of Bath) report on behalf of a larger

"We observed GRB 191221B (Laha et al. GCN 26534) with the Atacama Large
Millimeter/Submillimeter Array (ALMA) beginning on 2019 December 22 at
07:43:55 UT (11.1 hr after the burst) at 97.5 GHz under good weather
conditions. Preliminary analysis reveals a bright (S/N > 300) mm source at

10:19:19.225 (+/- 0.005), -38:09:27.45 (+/- 0.01)

consistent with the X-ray position (Beardmore et al. GCN 26540) and optical
position (Lipunov et al., GCN 26537). Follow-up 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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