GRB 201104C

The Fermi GBM team reports the detection of a likely LONG GRB

At 19:23:25 UT on 4 Nov 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201104C (trigger 626210610.205754 / 201104808).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 240.3, Dec = -36.7 (J2000 degrees, equivalent to J2000 16h 01m, -36d 42'), with a statistical uncertainty of 7.7 degrees.

The angle from the Fermi LAT boresight is 90.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201104808/quicklook/glg_skymap_all_bn201104808.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201104808/quicklook/glg_healpix_all_bn201104808.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201104808/quicklook/glg_lc_medres34_bn201104808.gif

[GCN OPS NOTE(06Nov20): Due to the uncertainty of the arrival time with respect 
to the downtime window (15 hours) of the GCN Circulars processing system, 
the error in the date-time in the header of this Circular can be off anywhere from 0-15 hours.]

P. A. Evans (U. Leicester) reports on behalf of the Swift team:

Swift has initiated a ToO observation of the ZTF GRB 201104C. 
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00021039

Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the ZTF event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a 
GCN Circular after manual consideration.

Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).

This circular is an official product of the Swift-XRT team.