Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 20633

GRB 170208A: Fermi GBM Detection
2017-02-09T00:05:14Z (7 years ago)
Oliver J Roberts at USRA/NASA <>
O.J. Roberts (USRA/NASA) and C. Meegan (UAH) report on 
behalf of the Fermi GBM Team:

"At 18:11:16.40 UT on the 8th of February 2017, the Fermi
Gamma-Ray Burst Monitor triggered and located GRB 170208A
(trigger 508270281 / 170208758), which was also detected by 
Swift (A. Cholden-Brown et al. 2017, GCN 20631). The GBM 
on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger
time using the Swift-XRT position is 117 degrees.

This burst was also independently detected by INTEGRAL SPI-ACS.

The GBM light curve consists of a long GRB with several
episodes of bright emission over a duration (T90) of about
7 s (50-300 keV). The time-averaged spectrum from T0+0 s
to T0+7.2 s is best fit by a power law function with an 
exponential high-energy cutoff.  The power law index is 
-0.92 +/- 0.09 and the cutoff energy, parameterized as Epeak 
is 246.9 +/- 30.5 keV

The event fluence (10-1000 keV) in this time interval is 
(3.10 +/- 0.19)E-06 erg/cm^2. The 1-sec peak photon flux
measured starting from T0-0.13 s in the 10-1000 keV band
is 8.1 +/- 0.4 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