TITLE:   GCN CIRCULAR
NUMBER:  31573
SUBJECT: GRB 220210A: BOOTES-5/JGT optical afterglow candidate
DATE:    22/02/11 05:26:21 GMT
FROM:    Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>

I. M. Carrasco-Garcia (UMA), A. J. Castro-Tirado, M.D. Caballero-Garcia, 
Y.-D. Hu, T.-R. Sun, E. Fernandez-Garcia, R. Sanchez-Ramirez and I. 
Olivares (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), S. 
Castillo-Carrion and C. J. Perez del Pulgar (UMA) and I. H. Park (SKKU) 
on behalf of a larger collaboration, report:

The 60cm BOOTES-5/JGT robotic telescope at Observatorio Astronomico 
Nacional in San Pedro Martir (Mexico) observed the Swift/BAT-GUANO error 
box for GRB 220210A (Tohuvavohu et al., GCNC 31572) also detected by 
Fermi (The Fermi Team, GCNC 31568) starting at 04:35 UT (i.e. 4.6 h post 
burst). In the single clear images (60 s exposure), we find an 
uncataloged optical source at (J2000) coordinates RA: 23:03:17.1, 
DEC:+61:49:36.6 (+/- 1”) within the Swift/BAT-GUANO error box and for 
which we measure a preliminary magnitude R = 18.5 mag. We propose this 
source to be the GRB 220210A optical afterglow, pending confirmation of 
its variability. Further multicolour observations are ongoing. 
Spectroscopic observations are encouraged.

We thank the staff at San Pedro Martir for their support.