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GCN Circular 35771

GRB 240222A: REM optical and NIR early-time observations
2024-02-22T14:35:20Z (5 months ago)
Riccardo Brivio <>
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R. Brivio, Y.-D. Hu, P. D’Avanzo, M. Ferro, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:

We observed the field of GRB 240222A (D'Avanzo et al., GCN 35770) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, H bands, starting on 2024 February 22 at 08:52:40 UT (i.e. 69 seconds after the burst), and lasting for about 2 hours.

From a preliminary analysis, we find no source at the XRT position down to the following 3sigma magnitude upper limits:

H > 16.7 (Vega; calibrated against the 2MASS catalogue)
at a mid-time of t - t0 = 342 s after the GRB trigger,

r > 18.7  (AB; calibrated against the APASS catalogue)
at a mid-time of t - t0 = 485 s after the GRB trigger.
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