TITLE: GCN CIRCULAR NUMBER: 22562 SUBJECT: GRB 180329B: NOT optical afterglow detection DATE: 18/03/29 23:19:12 GMT FROM: Daniel Perley at Liverpool JMU D. A. Perley (LJMU), K. E. Heintz (Univ. of Iceland and DAWN/NBI), and D. Malesani (DAWN/NBI and DARK/NBI) report: We observed the location of GRB 180329B (Racusin et al., GCN 22558) using the Nordic Optical Telescope (NOT) equipped with the AlFOSC imaging camera. Three exposures of 300 s each were obtained in the SDSS r filter. Observations were taken during twilight at low elevation, and the field was partially vignetted due to the dome shutter. A weak source is detected in each exposure at a position coincident with the Swift UVOT and XRT error circles. We estimate a magnitude of m(r) = 19.4 +/- 0.2 mag at the time of our observations (midpoint UT 20:27:14), corresponding to 6.32 hr after trigger. The position of the afterglow (J2000) is: RA = 05:31:36.90 Dec = -23:41:26.3 (+/- 0.4") We thank the NOT staff (J. Telting) and the observer (L. Siltala) for acquiring these observations. ________________________________ Important Notice: the information in this email and any attachments is for the sole use of the intended recipient(s). If you are not an intended recipient, or a person responsible for delivering it to an intended recipient, you should delete it from your system immediately without disclosing its contents elsewhere and advise the sender by returning the email or by telephoning a number contained in the body of the email. No responsibility is accepted for loss or damage arising from viruses or changes made to this message after it was sent. The views contained in this email are those of the author and not necessarily those of Liverpool John Moores University.