TITLE:   GCN CIRCULAR
NUMBER:  15512
SUBJECT: GRB 131122A: i-band observations from NOT
DATE:    13/11/23 02:08:00 GMT
FROM:    Javier Gorosabel at IAA-CSIC  <jgu@iaa.es>

J. Gorosabel (IAA-CSIC/UPV-EHU), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI),  D. Xu (DARK/NBI), S. Schulze (PUC, MCSS), N.R. Tanvir (U. Leicester),  O. Smirnova (NOT, U. Latvia), J. Kåre (U. Oslo), E. Pakstiene (Vilnius U.), A.B. Aksnes, C. Eide, E.N. Traore, J. Joberg, L.K. Seljebotn, N. Von Huth, M. Lapadatu, R.W. Cale, M Heger (Horten videregående skole) report on behalf of a larger collaboration:

We observed the field of the INTEGRAL GRB 131122A (Gorbovskoy et al., GCN 15509) with the 2.5m Nordic Optical Telescope (NOT) equipped with ALFOSC. Observations began at 00:34 UT (3.13 hr after the burst), when the field was at an airmass of ~3, and consisted of 8x180s in i-band, covering the complete INTEGRAL error box. The seeing of the combined image is around 0.9".

We do not see any obvious new source down to the limit of the SDSS i-band image to which we have compared, although we note that our frame is somewhat deeper, showing faint sources not present in the SDSS. A more precise localisation and/or deeper comparison image will be needed in order to identify a possible optical counterpart to GRB 131122A.