TITLE: GCN CIRCULAR NUMBER: 40430 SUBJECT: EP250511a: BOOTES-5 optical upper limit DATE: 25/05/11 12:27:11 GMT FROM: I. Perez-Garcia at Institute of Astrophysics of Andalusia ipg@iaa.es

I. Perez-Garcia, E. J. Fernandez-Garcia, M. D. Caballero-Garcia, S.-Y. Wu, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), I. M. Carrasco (SMA), M. Gritsevich (Univ. of Helsinki), C. Perez del Pulgar (Univ. of Malaga), Y.-D. Hu (GXU), S. Jeong (ADD, Daejeon), G. Garcia-Segura and D. Hiriart (IA-UNAM, Ensenada), D. R. Xiong (Yunnan Observatories of CAS, Kunming), and W. H. Lee (UNAM, Mexico DF), on behalf of a larger collaboration, report:

Following the detection of EP250511a by EP (Lian et al., GCNC [40429](https://gcn.nasa.gov/circulars/40429)), the 0.6m BOOTES-5/JGU robotic telescope at San Pedro Martir Observatory (Mexico) automatically responded to this high-energy event starting on May 11, 09:22:17 UT (i.e. 1.3 hours after detection and 1 min after notification). No optical transient is detected down to 18.2 mag (clear filter).

We would like to thank the staff at San Pedro Martir Observatory for their excellent support.

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