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GRB 160406A

GCN Circular 19259

Subject

IPN Triangulation of GRB 160406A (short/hard)

Date

2016-04-07T21:02:59Z (9 years ago)

From

Anna Kozlova at Ioffe Institute <ann_kozlova@mail.ioffe.ru>

A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa,
and A. Goldstein, on behalf of the Fermi GBM team,

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and

S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team, report:

A short-duration GRB 160406A has been detected by Konus-Wind, Fermi (GBM;
trigger 481637080), Swift (BAT), and INTEGRAL (SPI-ACS), so far, at about
43477 s UT (12:04:37). The burst was outside the coded field of view of
the BAT.

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  261.797 (17h 27m 11s) +32.363 (+32d 21' 48")
 Corners:
  262.805 (17h 31m 13s) +27.232 (+27d 13' 56")
  263.169 (17h 32m 41s) +27.080 (+27d 04' 47")
  260.364 (17h 21m 27s) +38.219 (+38d 13' 07")
  259.883 (17h 19m 32s) +38.538 (+38d 32' 15")
 ---------------------------------------------
The error box area is 3.34 sq. deg, and its maximum
dimension is 11.8 deg (the minimum one is 17.5 arcmin).
The Sun distance was 106 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB160406_T43476/IPN/

The time history and spectrum will be given in forthcoming GCN Circulars.

GCN Circular 19264

Subject

GRB 160406A: Fermi GBM observation

Date

2016-04-08T14:23:18Z (9 years ago)

From

Andreas von Kienlin at MPE <azk@mpe.mpg.de>

A. von Kienlin (MPE/UAH) and C. Meegan (UAH) 
report on behalf of the Fermi GBM Team: 

 "At 12:04:36.80 UT on 6 April 2016, the Fermi Gamma-Ray Burst Monitor
 triggered and located GRB 160406A (trigger 481637080 / 160406503), 
which was also detected by IPN (Kozlova et al. 2016, GCN 19259Loading...
 
 ). The 
GBM on-ground location is consistent with the IPN triangulated position. 

The angle from the Fermi LAT boresight at the GBM trigger time is 77.5 degrees. 

The GBM light curve shows a single pulse 
with a duration (T90) of about 0.4 s (50-300 keV). 
The time-averaged spectrum from T0-0.064 s to T0+0.192 s is 
best fit by a power law function with an exponential 
high-energy cutoff. The power law index is -0.75 (+0.13/-0.12) and 
the cutoff energy, parameterized as Epeak, is 700 (+210 /-130) keV.

The event fluence (10-1000 keV) in this time interval is (7.2 +/- 0.4)E-07 erg/cm^2. 
The 0.064-sec peak photon flux measured starting from T0+0.0 s in the 10-1000 keV
band is 17 +/- 1 ph/s/cm^2. 

The spectral analysis results presented above are preliminary; 
final results will be published in the GBM GRB Catalog."