Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 19006

GRB 160206B: Fermi GBM detection
2016-02-09T17:07:58Z (8 years ago)
Oliver Roberts at UCD/Fermi <>
O.J. Roberts (UCD) and C. Meegan (UAH) report on
behalf of the Fermi GBM Team:

"At 10:19:12.43 UT on 06 February 2016, the Fermi
Gamma-Ray Burst Monitor triggered and located GRB
160206B (trigger 476446756 / 160206430). A list of
optical candidates were observed by iPTF within the
2-sigma statistical+systematic region of the final
on-ground calculated location (Singer et al., GCN 18995).
The on-ground calculated location, using the GBM trigger
data, is RA = 184.3, DEC = 52.4 (J2000 degrees,
equivalent to 12h 17m, 52d 24'), with an uncertainty of
4.2 degrees (radius, 1-sigma containment, statistical only;
there is additionally a systematic error which we have
characterized as a core-plus-tail model, with 90% of GRBs
having a 3.7 deg error and a small tail suffering a larger
than 10 deg systematic error.
[Connaughton et al. 2015, ApJS, 216, 32]).

The angle from the Fermi LAT boresight is about 83 degrees.

The GBM light curve consists of a FRED-like pulse with a
duration (T90) of about 21.5 s (50-300 keV). The
time-averaged spectrum from T0-4.9 s to T0+16.6 s is best
fit by a power law function with an exponential high-energy
cutoff. The power law index is -0.93 +/- 0.10 and the cutoff
energy, parameterized as Epeak, is 356.0 +/- 69.5 keV.

The event fluence (10-1000 keV) in this time interval is
(4.6 +/- 0.4)E-06 erg/cm^2. The 1.024-sec peak photon flux
measured starting from T0+3.4 s in the 10-1000 keV band is
3.0 +/- 0.2 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
Looking for U.S. government information and services? Visit