batgrbproduct Analysis for Trigger=709357
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): Mon Aug 22 16:33:49 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger709357/GCN5_download_cron
======================================================================
Trigger: 00709357 Segment: 000
BAT Trigger Time: 493511370.048 [s; MET]
Trigger Stop: 493511370.112 [s; MET]
UTC: 2016-08-21T22:29:13.303140 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 279.987123430967 Dec: 62.3929503514047 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.14
Image Trigger?: NO
Rate S/N Ratio: 34.6121365997536 [ if not an image trigger ]
Image S/N Ratio: 10.14
Flight Position: [ source = BAT ]
RA: 279.987123430967 Dec: 62.3929503514047 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.005357801052 Dec: 62.387008317718 [deg; J2000]
{ 18h 40m 01.3s , +62d 23' 13.2" }
+/- 1.43795830804115 [arcmin] (estimated 90% radius based on SNR)
+/- 0.782720121526222 [arcmin] (formal 1-sigma fit error)
SNR: 18.1036660964929
Angular difference between Flight and Ground position is 0.619840 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 0.479999959468842 +/- 0.0729931709021742
Measured from: 0.00800013542175293
to: 0.488000094890594 [s; relative to TRIGTIME]
T50: 0.275999963283539 +/- 0.0505964885533881
Measured from: 0.0440001487731934
to: 0.320000112056732 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.229999959468842
to: 0.770000040531158 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.53600001335144 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.065441 0.095283 0.043728 -0.000834
0.006126 0.006906 0.005458 0.003961 [error]
Peak 0.060014 0.091690 0.047443 0.007463
0.007576 0.008266 0.006757 0.005071 [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 2.28e-08 3.33e-08 3.63e-08 7.41e-08 1.15e-07 1.66e-07 erg/cm2
Error 2.83e-09 2.97e-09 5.01e-09 1.98e-08 1.20e-08 2.54e-08 erg/cm2
Peak flux Power-law 6.93e-01 5.94e-01 3.48e-01 3.05e-01 1.77e+00 1.94e+00 ph/cm2/s
Error 1.10e-01 6.42e-02 5.38e-02 8.94e-02 1.91e-01 2.11e-01 ph/cm2/s
Fluence Cutoff-PL 1.91e-08 4.09e-08 3.54e-08 9.17e-09 1.03e-07 1.05e-07 erg/cm2
Error 3.38e-09 4.46e-09 6.32e-09 8.55e-09 1.19e-08 1.42e-08 erg/cm2
Peak flux Cutoff-PL 5.64e-01 7.02e-01 3.64e-01 6.62e-02 1.69e+00 1.70e+00 ph/cm2/s
Error 1.33e-01 8.97e-02 6.61e-02 6.21e-02 1.96e-01 2.04e-01 ph/cm2/s
Fluence Band 1.89e-08 4.09e-08 3.50e-08 1.47e-08 1.04e-07 1.10e-07 erg/cm2
Error -------- -------- -------- 1.61e-08 -------- -------- 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 1.876 0.149 - - 2.34e-02 2.43e-03 75.270 57
CPL 0.110 0.881 46.3 6.4 2.29e-01 3.90e-01 58.760 56
The chi2 of BB fit is 65.67 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 1.772 0.179 - - 1.30e-02 1.57e-03 66.330 57
CPL 0.174 1.021 51.3 10.8 9.69e-02 1.96e-01 56.350 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.536 0.000 0.536
T90 0.480 0.008 0.488
T50 0.276 0.044 0.320
Peak 1.000 -0.230 0.770
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.0054 +62.3870 0.0106 22.6 28.8 0.2133 18.1 TRIG_00709357
------------------------------------------
Foreground time interval of the image:
0.000 0.536 (delta_t = 0.536 [sec])
Background time interval of the image:
-239.048 -109.818 (delta_t = 129.230 [sec])
-109.048 0.000 (delta_t = 109.048 [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 0.000 sec. to 0.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87585 ( -0.145689 0.151592 )
Norm@50keV : 2.33610E-02 ( -0.00244436 0.00241203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.27 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 57 degrees of freedom
# Null hypothesis probability = 5.289719e-02
Photon flux (15-150 keV) in 0.536 sec: 3.31871 ( -0.29706 0.297132 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15109e-07 ( -1.18994e-08 1.20438e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.109521 ( -0.954506 0.807026 )
Epeak [keV] : 46.3337 ( -5.36584 7.45904 )
Norm@50keV : 0.229370 ( -0.229375 0.551 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.76 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 56 degrees of freedom
# Null hypothesis probability = 3.746488e-01
Photon flux (15-150 keV) in 0.536 sec: 3.17393 ( -0.3022 0.30314 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02913e-07 ( -1.15615e-08 1.22964e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.340126 ( -0.988883 1.35321 )
beta : -4.43944 ( 4.05173 13.6274 )
Epeak [keV] : 51.5486 ( -5.72436 6.68545 )
Norm@50keV : 0.150022 ( -0.0911792 0.654428 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.30 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.899569e-01
Photon flux (15-150 keV) in 0.536 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03785e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4139 (-0.960381 1.04621)
R^2/D10^2 : 1.02409 (-0.29023 0.401105)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.67 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.016263e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.504e-08 2.409e-09
25- 50 4.455e-08 4.612e-09
50-150 3.370e-08 7.239e-09
15-150 9.329e-08 1.008e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.2583 (-18.1918 27.852)
Norm : 15.9617 (-1.95311 2.23263)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.140811e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.219e-08 2.559e-09
25- 50 3.644e-08 3.251e-09
50-150 5.112e-08 1.930e-08
15-150 1.097e-07 1.718e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.04871 (-1.75461 2.55974)
R1^2/D10^2 : 18.1377 (-15.5226 365.425)
kT2 [keV] : 13.2236 (-1.61316 2.45115)
R2^2/D10^2 : 0.521607 (-0.289628 0.384209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.132429e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.974e-08 8.432e-09
25- 50 3.986e-08 1.197e-08
50-150 4.063e-08 1.483e-08
15-150 1.002e-07 3.470e-08
Peak spectrum fit
Power-law model
Time interval is from -0.230 sec. to 0.770 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77210 ( -0.175061 0.182215 )
Norm@50keV : 1.29668E-02 ( -0.0015786 0.00155629 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.33 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.861270e-01
Photon flux (15-150 keV) in 1 sec: 1.76783 ( -0.190849 0.190931 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19514e-07 ( -1.48119e-08 1.50205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.230 sec. to 0.770 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.174169 ( -1.12489 0.916414 )
Epeak [keV] : 51.3282 ( -7.54418 13.9958 )
Norm@50keV : 9.69256E-02 ( -0.0969279 0.294934 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.35 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 56 degrees of freedom
# Null hypothesis probability = 4.617358e-01
Photon flux (15-150 keV) in 1 sec: 1.68552 ( -0.19628 0.19646 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07496e-07 ( -1.47673e-08 1.578e-08 ) ergs/cm2
Band function
Time interval is from -0.230 sec. to 0.770 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.174461 ( -0.707305 0.713542 )
beta : -10.00000 ( 10 8.06369e-06 )
Epeak [keV] : 51.3188 ( -7.48936 13.9943 )
Norm@50keV : 9.69047E-02 ( -0.0101885 0.295406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.35 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.241688e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08076e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2700 (-1.27079 1.42608)
R^2/D10^2 : 0.419249 (-0.141091 0.20886)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.65 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.134069e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.337e-08 2.510e-09
25- 50 4.318e-08 6.005e-09
50-150 3.966e-08 9.535e-09
15-150 9.622e-08 1.324e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.3222 (-29.0421 53.9169)
Norm : 7.98034 (-1.08439 1.27195)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.57 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.483635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.086e-08 3.315e-09
25- 50 3.594e-08 4.425e-09
50-150 5.768e-08 2.473e-08
15-150 1.145e-07 2.736e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.01681 (-4.00192 3.17898)
R1^2/D10^2 : 9.95694 (-8.96527 58.8764)
kT2 [keV] : 14.2260 (-2.03574 3.19718)
R2^2/D10^2 : 0.217786 (-0.132141 0.173728)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9914 for 55 degrees of freedom
# Null hypothesis probability = 4.927451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.854e-08 7.922e-09
25- 50 3.850e-08 1.372e-08
50-150 4.722e-08 1.888e-08
15-150 1.043e-07 3.731e-08
Plot creation:
Mon Aug 22 16:38:20 EDT 2016