Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New! Circulars over Kafka, Heartbeat Topic, and Schema v4.1.0. See news and announcements

GCN Circular 23439

Subject
GRB 181123B: Gemini-North optical detection
Date
2018-11-23T20:30:11Z (6 years ago)
From
Wen-fai Fong at Northwestern U <wfong@northwestern.edu>
W. Fong (Northwestern Univ.), N. R. Tanvir (U. Leicester) and A. J. Levan (U. Warwick) report on behalf of a larger collaboration:

"We observed the location of the short-duration GRB 181123B (Lien et al., GCN 23432) with the Gemini Multi-Object Spectrograph (GMOS) mounted on the Gemini-North 8-meter telescope. We obtained 18x90-sec each in the i-band at a mid-time of 2018 November 23.618 UT (9.2 hr post-burst). The observations have an airmass range of 1.4-1.9, 0.9��� seeing, and were taken in thick, variable clouds. We detect a faint source consistent with the UVOT-enhanced XRT position (Evans et al., GCN 23433; Osborne et al., GCN 23434) at the position:

RA(J2000) = 12:17:27.95
Dec(J2000) = +14:35:52.5
+/- 0.05" in each coordinate

The source has a preliminary magnitude of i~23.32 +/- 0.25 AB mag, not corrected for Galactic extinction. Both astrometry and photometry are calibrated to SDSS. The source appears to be marginally extended; however, at present it is too weak of a detection to make a strong conclusion.

Further observations are planned. We thank the Gemini staff, and in particular observers Julia Scharwaechter and Michael Hoenig, for their assistance with these observations."
Looking for U.S. government information and services? Visit USA.gov