batgrbproduct Analysis for Trigger=686443
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Tue May 17 17:56:24 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger686443/GCN5_download_cron
======================================================================
Trigger: 00686443 Segment: 000
BAT Trigger Time: 485124603.26 [s; MET]
Trigger Stop: 485124603.276 [s; MET]
UTC: 2016-05-16T20:49:46.981860 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.704102098376 Dec: 21.8799242647327 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.21
Image Trigger?: NO
Rate S/N Ratio: 42.8952211790544 [ if not an image trigger ]
Image S/N Ratio: 9.21
Flight Position: [ source = BAT ]
RA: 293.704102098376 Dec: 21.8799242647327 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.731746221103 Dec: 21.8823287360038 [deg; J2000]
{ 19h 34m 55.6s , +21d 52' 56.4" }
+/- 2.16653014226968 [arcmin] (estimated 90% radius based on SNR)
+/- 1.32753716540423 [arcmin] (formal 1-sigma fit error)
SNR: 10.0798593445696
Angular difference between Flight and Ground position is 1.545903 arcmin
Partial Coding Fraction: 0.2382812 [ including projection effects ]
Duration
T90: 0.0279999375343323 +/- 0.0113137314268704
Measured from: -0.0119998455047607
to: 0.0160000920295715 [s; relative to TRIGTIME]
T50: 0.0079999566078186 +/- 0.00400000810623169
Measured from: -0.00399988889694214
to: 0.00400006771087646 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.495999991893768
to: 0.504000008106232 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.015999972820282
to: 0.0199999809265137 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.052209 0.042752 0.015764 -0.000316
0.007330 0.006367 0.004136 0.001735 [error]
Peak 0.054357 0.018000 0.015661 -0.002993
0.014665 0.014723 0.010493 0.009347 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 9.64e-09 4.08e-09 1.02e-09 3.15e-10 1.49e-08 1.50e-08 erg/cm2
Error 2.76e-09 1.26e-09 5.11e-10 2.57e-10 4.09e-09 4.13e-09 erg/cm2
Peak flux Power-law 4.87e-01 2.68e-01 9.25e-02 4.17e-02 8.70e-01 8.89e-01 ph/cm2/s
Error 2.39e-01 1.27e-01 8.15e-02 7.77e-02 3.46e-01 3.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.38e-08 1.49e-08 1.63e-10 9.26e-17 2.89e-08 2.89e-08 erg/cm2
Error 3.84e-09 3.87e-09 1.74e-10 3.34e-15 5.50e-09 5.50e-09 erg/cm2
Peak flux Cutoff-PL 4.86e-01 2.68e-01 9.27e-02 4.16e-02 8.69e-01 8.89e-01 ph/cm2/s
Error 1.79e-01 1.30e-01 8.31e-02 5.66e-02 3.46e-01 3.56e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.987 0.422 - - 1.90e-02 7.83e-03 96.740 57
CPL 1.000 0.000 50.0 0.0 2.87e-02 0.00e+00 128.500 56
The chi2 of BB fit is 68.38 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.534 1.021 - - 4.34e-03 3.64e-03 66.360 57
CPL -8.303 0.000 21.2 0.0 2.18e+06 0.00e+00 66.040 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.036 -0.016 0.020
T90 0.028 -0.012 0.016
T50 0.008 -0.004 0.004
Peak 1.000 -0.496 0.504
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7317 +21.8823 0.0190 34.2 77.7 0.1174 10.1 TRIG_00686443
------------------------------------------
Foreground time interval of the image:
-0.016 0.020 (delta_t = 0.036 [sec])
Background time interval of the image:
-239.260 -0.016 (delta_t = 239.244 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.016 sec. to 0.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.98707 ( -0.394098 0.449953 )
Norm@50keV : 1.90176E-02 ( -0.00770539 0.00795124 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.74 using 59 PHA bins.
# Reduced chi-squared = 1.697 for 57 degrees of freedom
# Null hypothesis probability = 7.996933e-04
Photon flux (15-150 keV) in 0.036 sec: 11.6103 ( -3.19627 3.19987 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4935e-08 ( -4.0847e-09 4.09212e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.87473E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 128.50 using 59 PHA bins.
# Reduced chi-squared = 2.2947 for 56 degrees of freedom
# Null hypothesis probability = 1.260993e-07
Photon flux (15-150 keV) in 0.036 sec: 20.3005 ( -4.1134 4.1386 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88945e-08 ( -5.49846e-09 5.49886e-09 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -1.36866 -5 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 23.3420 ( -1.57645 1.51129 )
Norm@50keV : 5.53961E+04 ( -10682.6 40106.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.60 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Null hypothesis probability = 2.809119e-01
Photon flux (15-150 keV) in 0.036 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.00802 (-0.428039 0.41668)
R^2/D10^2 : 169.416 (-66.7284 102.801)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.38 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.436534e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.493e-08 3.685e-09
25- 50 9.788e-09 2.686e-09
50-150 4.011e-10 2.056e-10
15-150 2.512e-08 5.783e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4604 (-1.82761 2.1807)
Norm : 422.808 (-154.925 208.489)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.91 using 59 PHA bins.
# Reduced chi-squared = 1.437 for 57 degrees of freedom
# Null hypothesis probability = 1.698688e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.280e-08 3.560e-09
25- 50 6.554e-09 1.847e-09
50-150 6.393e-10 3.602e-10
15-150 1.999e-08 5.166e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.00795 (-0.427971 0.416748)
R1^2/D10^2 : 169.429 (-66.7403 102.789)
kT2 [keV] : 3.93769E-02 (-0.0393769 -0.0393769)
R2^2/D10^2 : 4.83808E-04 (-0.000483808 -0.000483808)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.38 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Null hypothesis probability = 1.060795e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53371 ( -0.83042 1.21179 )
Norm@50keV : 4.33558E-03 ( -0.00433558 0.00293844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.36 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.855418e-01
Photon flux (15-150 keV) in 1 sec: 0.869600 ( -0.346647 0.346014 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37586e-08 ( -2.14948e-08 2.35724e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.30250 ( )
Epeak [keV] : 21.1707 ( )
Norm@50keV : 2.18499E+06 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.04 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 56 degrees of freedom
# Null hypothesis probability = 1.687015e-01
Photon flux (15-150 keV) in 1 sec: 0.869362 ( -0.346271 0.344758 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.3126e-08 ( -4.3126e-08 2.42303e-08 ) ergs/cm2
Band function
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.90815 ( 1.49576 1.49576 )
beta : -2.88099 ( 2.66705 0.939475 )
Epeak [keV] : 18.7766 ( -11.8017 -11.8017 )
Norm@50keV : 137.713 ( -138.272 10500.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.506539e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.78980 (-1.46737 2.32928)
R^2/D10^2 : 8.69027 (-8.69027 42.76)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.85 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.747287e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.774e-08 1.107e-08
25- 50 1.041e-08 6.880e-09
50-150 3.422e-10 3.712e-10
15-150 2.849e-08 1.788e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.5207 (-13.1089 132.258)
Norm : 9.87381 (-9.75815 34.1509)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.33 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 57 degrees of freedom
# Null hypothesis probability = 1.644581e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.565e-08 1.013e-08
25- 50 1.397e-08 8.975e-09
50-150 4.368e-09 4.603e-09
15-150 3.399e-08 2.247e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.48329 (-1.43627 1.93065)
R1^2/D10^2 : 11.0874 (-5.51205 65.5335)
kT2 [keV] : 36.2046 (-34.487 -35.9458)
R2^2/D10^2 : 2.26395E-03 (-0.00228345 0.0224412)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 1.999876e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.748e-08 1.110e-08
25- 50 1.115e-08 6.765e-09
50-150 2.301e-08 1.543e-08
15-150 5.164e-08 2.463e-08
Plot creation:
Tue May 17 18:01:44 EDT 2016