TITLE: GCN CIRCULAR NUMBER: 39852 SUBJECT: GRB 250322A: Gemini-North redshift of candidate host galaxy DATE: 25/03/23 13:40:27 GMT FROM: Wen-fai Fong at Northwestern University wfong@northwestern.edu
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 39835; Tembhurnikar et al., GCN 39849) 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.
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