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GCN Circular 39852

Subject

GRB 250322A: Gemini-North redshift of candidate host galaxy

Date

2025-03-23T13:40:27Z (3 days ago)

From

Wen-fai Fong at Northwestern University <wfong@northwestern.edu>

Via

Web form

W. Fong (Northwestern), A. J. Levan (Radboud), J.C. Rastinejad (Northwestern), N. R. Tanvir (Leicester), C. D. Kilpatrick (Northwestern) report on behalf of a larger collaboration:

We observed the putative host galaxy within the XRT localization (Goad et al., GCN 39841

) of the short-duration GRB 250322A (Gupta et al., GCN ; Tembhurnikar et al., GCN ) using the Gemini Multi-Object Spectrograph (GMOS-N) mounted on Gemini-North telescope in Hawaii. We obtained 4x900-sec exposures using the R400 grating, spanning approximately 5000A to 9500A, starting at 2025-03-23 05:33:34 UT (approx 13.5 hr post-burst), under Program GN-2025A-Q-114 (PI: Fong).

The continuum is well-detected along with several prominent emission lines. In particular, we identify emission lines of H-alpha, NII, OIII (5007), H-beta and H-gamma, corresponding to a common redshift of z=0.42.

We thank Jennifer Andrews, Adam Smith, and Hyewon Suh for the rapid scheduling and execution of these observations.