{
  "bibcode": "2015GCN.18279....1C",
  "body": "Z. Cano (U. Iceland), D. Malesani (DARK/NBI), A. de Ugarte Postigo\n(IAA-CSIC, DARK/NBI), D. Xu (NAOC/CAS), J. Saario (NOT, U. Turku) and P.\nJakobsson (U. Iceland) report on behalf of a larger collaboration:\n\nWe observed the field of GRB 150910A (Pagani et al., GCN Circ. 18264) with\nthe 2.5-m Nordic Optical Telescope (NOT) equipped with MOSCA in two epochs\non the morning of 11-Sept-2015, at 01:10 and 04:45 UT, respectively.  In\nSDSS filters r (epoch 1) and ugrz (epoch 2) we clearly detect the optical\nafterglow (e.g. Zheng & Filippenko, GCN Circ. 18265).\n\nA summary of our photometry is as follows:\n\n-------------------------------------------------------\nfilter (SDSS)        t-t0 (hr)            mag +- merr\n-------------------------------------------------------\n   r                  16.27              20.85 +- 0.18\n   r                  20.18              21.24 +- 0.21\n   u                  20.05              21.82 +- 0.24\n   g                  20.24              21.49 +- 0.22\n   z                  19.84              20.78 +- 0.24\n\nThese magnitudes are calibrated to SDSS and are not corrected for\nforeground extinction.  We note that these magnitudes are in good agreement\nwith those obtained by GROND (Schmidl et al., GCN Circ. 18277) at a\ncontemporaneous post-explosion epoch.  Compared with other datasets, e.g.\nXu et al. (GCN Circ. 18269), our second epoch of r-band observations\nimplies a power-law like decay in time, e.g. f(t)=t^-alpha, with a decay\nslope of alpha=1.\n���1.",
  "circularId": 18279,
  "createdOn": 1441976791000,
  "email": "zewcano@gmail.com",
  "subject": "GRB 150910A: NOT observations of the afterglow",
  "submitter": "Zach Cano at U of Iceland  <zewcano@gmail.com>",
  "eventId": "GRB 150910A"
}