[vsnet-grb-info 21341] GRB 181123B: Keck near-infrared imaging

GCN Circulars gcncirc at capella2.gsfc.nasa.gov
Sat Nov 24 05:54:51 JST 2018


TITLE:   GCN CIRCULAR
NUMBER:  23440
SUBJECT: GRB 181123B: Keck near-infrared imaging 
DATE:    18/11/23 20:53:41 GMT
FROM:    Wen-fai Fong at Northwestern U  <wfong at northwestern.edu>

K. Paterson and W. Fong (Northwestern) report:

"We observed the field of the short-duration GRB 181123B (Lien et al., GCN 23432) with the Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) mounted on the 10-m Keck I telescope, starting on 2018 November 23 at 14:43:18 UT, 9.2 hours post-burst. We obtained 2100-sec of observations in the J-band in 1.0" seeing.

In our combined stack, we identify a near-IR source consistent with the X-ray position of the afterglow (Evans et al., GCN 23433; Osborne et al., GCN 23434) and the Gemini optical source (Fong et al., GCN 23439). Calibrated to 2MASS, we estimate a preliminary brightness of J(AB) = 22.94 +/- 0.19 mag. At this point it is not possible to tell whether this source is point-like or extended.

We thank the Keck Observatory staff, in particular Arina, Joel, Alessandro, Josh and Randy, for their assistance with planning and executing these observations."



More information about the vsnet-grb-info mailing list