{
  "bibcode": "2009GCN..9675....1A",
  "body": "L. A. Antonelli (INAF-OAR), S. Marinoni (INAF-TNG), F. Montalvo (UNAM- \nOAN), A. Vazquez (UNAM-IA) report:\n\nWe observed the field of GRB 090715B (Vetere et al., GCN 9668) with  \nthe 1.5 m Telescope in San Pedro Martir (BCN-Mexico) equipped with  \nLaRuca, in the B, V, and R filters.\n\nWe started observations on 2009 July 16.1729 UT (7.07 hrs after the  \nburst) and we detect the object reported by Malesani et al., (GCN  \n9671), Smith et al. (GCN 9670) and Vetere et al. (GCN 9668) in all  \nfilters. The object has a magnitude R = 20.4 +- 0.1 (calibrated  \nagainst USNO B1). The object has faded with respect of the value  \nreported by Malesani et al., (GCN 9671) with a decay index of 0.77 \n+-0.39. Due to its fading behavior we can confirm that it is the  \noptical afterglow of GRB 090715B.\n\nThis message can be cited.",
  "circularId": 9675,
  "createdOn": 1247732861000,
  "email": "a.antonelli@oa-roma.inaf.it",
  "subject": "GRB 090715B: Observation of the optical afterglow",
  "submitter": "Angelo Antonelli at Obs. Astro. di Roma  <a.antonelli@oa-roma.inaf.it>",
  "eventId": "GRB 090715B"
}