TITLE:   GCN CIRCULAR
NUMBER:  35696
SUBJECT: GRB 240205B: BOOTES-6 optical afterglow follow-up
DATE:    24/02/06 23:51:09 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>

E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, S. Guziy, S.-Y. Wu, I. Olivares, R. Sanchez-Ramirez and A. J. Castro-Tirado (IAA-CSIC, Granada), Y.-D. Hu (INAF-OAB Brera), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland), A. Castellon, S. Castillo, A. J. Reina and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report:

Following the detection of GRB 240205B by Fermi (GCNC 35682, Fletcher et al. GCNC 35693), Swift (Palmer et al., GCNC 35683), INTEGRAL_SPIACS (trig# 10513), CALET/GBM (trig# 1391206207) and GECAM (Zhang et al., GCNC 35689), the 0.6m BOOTES-6/DPR robotic telescope at Boyden Observatory (South Africa) continued the observation of this burst, starting on Feb 6 at 18:13 UT (i.e. ~20 h after trigger), as part of the monitoring conducted by the BOOTES Global Network of Robotic Telescopes. Images were gathered in different optical bands (griz). The optical afterglow (Lipunov et al. GCNC 35684, Fernandez-Garcia et al. GCNC 35686, Dutton et al. GCNC 35687, Ferro et al. GCNC 35694) is still detected in all filters. We measure a g-band mag of 18.1 ± 0.1 (on a 300s image taken at 18:30 UT). Spectroscopic observations, in spite of the low elevation of the target after sunset, are encouraged.

We thank the staff at Boyden Observatory for their excellent support.