TITLE: GCN CIRCULAR NUMBER: 10380 SUBJECT: GRB 100206A: Optical limit DATE: 10/02/06 18:34:33 GMT FROM: Dipankar Bhattacharya at IUCAA D. Bhattacharya, Vijay Mohan, A.N. Ramaprakash, Chaitanya Rajarshi (IUCAA) and Kuntal Misra (STScI)report: We imaged the field of GRB100206A (Krimm et al. GCN 10376, Goad et al GCN 10378) using the 2-m telescope of the IUCAA Girawali Observatory. Four 15-min exposures in R-band were taken on 06 Feb 2010 starting at 15:46 UT. The stacked 1 hour exposure shows no optical transient to a limiting magnitude of R ~22. The extended source reported by Miller et al (GCN 10377) is however clearly detected.