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Optical observations Swift Transient in M31

ATel #6180; Velasco S., Chinchilla P., Gómez M., Martinez C., Monteagudo L. (Instituto de Astrofísica de Canarias, Dpto Astrofísica Universidad de La Laguna)
on 28 May 2014; 08:15 UT
Credential Certification: Sergio Velasco (svelasco@iac.es)

Subjects: Optical, Gamma-Ray Burst

We report our optical observations of the M31 globular cluster G108 (Bo 45), associated with the transient reported by the Swift team (Barthelmy et al., GCN 16332) using 0.82 meter IAC-80 Telescope at Teide Observatory located in Tenerife (Spain) and operated by the Instituto de Astrofísica de Canarias. We obtained B, V and I band observations of the field on 2014 May 28 at 4:55 UT. Using 300s exposure times for V and I bands and 360s for the B band. We are able to clearly detect the source in each filter. Reference was selected on the same field, due to the lack of a well-photometric determined star, we have used values for Bol 50 Globular Cluster from Galleti S. et al., (2004A&A...416..917G). FILTER MAG ERR B 16.9±0.2 B-V 1.04 V-I 0.99 There are not any remarkable changes in the optical bands. Based on observations made with the IAC80 operated on the island of Tenerife by the ISC in the Spanish Observatorio del Teide.