TITLE: GCN CIRCULAR NUMBER: 17097 SUBJECT: GRB 141124A​: iPTF upper limits​ DATE: 14/11/24 18:38:42 GMT FROM: Varun Bhalerao at IUCAA V. Bhalerao (IUCAA), S. B. Cenko (NASA/GSFC), L. P. Singer (Caltech) ​and ​ M. M. Kasliwal (Carnegie Observatories/Princeton) ​ ​ report on behalf of the intermediate Palomar Transient Factory (iPTF) collaboration: We searched for optical counterparts of GRB 141124A ​ (GCN Notice http://gcn.gsfc.nasa.gov/other/438503903.fermi) using the Palomar 48-inch Oschin telescope (P48). At about 18 minutes after the burst, we began imaging 30 fields spanning an area of 2 ​12​ deg2, covering most of the 1-sigma statistical+systematic region of the initial Fermi GBM localization, as well as about half of the 1-sigma statistical + systematic region of the final Fermi GBM localization (Fermi trigger 438503903 / 141124277). Based on the GBM localization, we estimate a ​44% chance that these fields contain the true location of the source. Sifting through candidate variable sources using ​ image subtraction and standard iPTF vetting procedures, we detected the ​ ​ following optical transient candidates ​:​ iPTF14ihm RA (J2000) 08:22:15.03 (125.562634 deg) Dec (J2000) +74:50:00.5 (+74.833477 deg) Consistent with stellar source, photometry does not show rapid evolution. iPTF14ihn RA (J2000) 10:36:56.79 (159.236626 deg) Dec (J2000) +71:10:52.0 (+71.181099 deg) Likely high proper motion star, photometry does not show rapid evolution. iPTF14iho RA (J2000) 09:45:09.42 (146.289253 deg) Dec (J2000) +74:20:12.1 (+74.336707 deg) Near undocumented galaxy, photometry does not show rapid evolution. iPTF14ihp RA (J2000) 10:54:59.28 (163.746991 deg) Dec (J2000) +68:11:53.5 (+68.198184 deg) Photometry shows decline over 60-minute period, but the image subtraction residuals are centered on a stellar source in the reference image. This is most likely a galactic variable. ​We conclude that we have not detected the optical afterglow of GRB 141124A​.