batgrbproduct Analysis for Trigger=706052
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 Jul 26 18:21:13 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger706052/batgroup_hand_proc
======================================================================
Trigger: 00706052 Segment: 000
BAT Trigger Time: 491189664.288 [s; MET]
Trigger Stop: 491189664.32 [s; MET]
UTC: 2016-07-26T01:34:07.673500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 98.8207862266102 Dec: -6.64457301434871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: NO
Rate S/N Ratio: 24.2899156029822 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 98.8207862266102 Dec: -6.64457301434871 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 98.8093070842852 Dec: -6.61749576541698 [deg; J2000]
{ 06h 35m 14.2s , -06d 37' 03.0" }
+/- 1.2977315545875 [arcmin] (estimated 90% radius based on SNR)
+/- 0.40961721652998 [arcmin] (formal 1-sigma fit error)
SNR: 20.9616621091504
Angular difference between Flight and Ground position is 1.762807 arcmin
Partial Coding Fraction: 0.5859375 [ including projection effects ]
Duration
T90: 0.727999925613403 +/- 0.0357770801763245
Measured from: 0.0160000324249268
to: 0.74399995803833 [s; relative to TRIGTIME]
T50: 0.179999947547913 +/- 0.18070972196459
Measured from: 0.495999991893768
to: 0.675999939441681 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.107999980449677
to: 0.892000019550323 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00400000810623169
to: 0.780000030994415 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.079550 0.120020 0.134796 0.042609
0.008674 0.009993 0.009692 0.006766 [error]
Peak 0.083172 0.127578 0.138020 0.043373
0.009542 0.010735 0.010281 0.007242 [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 2.64e-08 5.64e-08 9.46e-08 3.62e-07 2.60e-07 5.39e-07 erg/cm2
Error 3.88e-09 5.07e-09 9.01e-09 7.51e-08 2.28e-08 8.10e-08 erg/cm2
Peak flux Power-law 9.17e-01 1.04e+00 8.48e-01 1.15e+00 3.23e+00 3.96e+00 ph/cm2/s
Error 1.40e-01 9.85e-02 8.15e-02 2.28e-01 2.75e-01 3.37e-01 ph/cm2/s
Fluence Cutoff-PL 2.44e-08 5.83e-08 9.88e-08 2.29e-07 2.57e-07 4.10e-07 erg/cm2
Error 4.76e-09 5.77e-09 1.08e-08 1.37e-07 2.36e-08 1.35e-07 erg/cm2
Peak flux Cutoff-PL 8.22e-01 1.08e+00 8.98e-01 7.52e-01 3.17e+00 3.55e+00 ph/cm2/s
Error 1.75e-01 1.10e-01 1.02e-01 3.56e-01 2.83e-01 4.93e-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 1.255 0.134 - - 3.35e-02 2.68e-03 55.290 57
CPL 0.891 0.495 170.9 -49.4 4.94e-02 2.80e-02 53.780 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.297 0.139 - - 2.71e-02 2.23e-03 54.560 57
CPL 0.834 0.562 141.0 -45.0 4.43e-02 2.82e-02 52.410 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.776 0.004 0.780
T90 0.728 0.016 0.744
T50 0.180 0.496 0.676
Peak 1.000 -0.108 0.892
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
98.8093 -6.6175 0.0092 38.0764 -26.0822 0.3834218 20.962 TRIG_00706052
Foreground time interval of the image:
0.004 0.780 (delta_t = 0.776 [sec])
Background time interval of the image:
-239.288 0.004 (delta_t = 239.292 [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 0.004 sec. to 0.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25542 ( -0.134422 0.134281 )
Norm@50keV : 3.35436E-02 ( -0.00268125 0.00268112 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 0.9700 for 57 degrees of freedom
# Null hypothesis probability = 5.394211e-01
Photon flux (15-150 keV) in 0.776 sec: 3.97082 ( -0.327464 0.327888 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60135e-07 ( -2.28088e-08 2.28866e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.890648 ( -0.564855 0.425803 )
Epeak [keV] : 170.932 ( -72.0467 -170.932 )
Norm@50keV : 4.94234E-02 ( -0.017451 0.0384604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9604 for 56 degrees of freedom
# Null hypothesis probability = 5.591835e-01
Photon flux (15-150 keV) in 0.776 sec: 3.92195 ( -0.33465 0.33469 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57113e-07 ( -2.36106e-08 2.35151e-08 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.931765 ( -0.330117 0.24281 )
beta : -9.33326 ( 9.33289 19.3329 )
Epeak [keV] : 186.242 ( -55.3107 -186.237 )
Norm@50keV : 4.72666E-02 ( -0.00377147 0.0152962 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.80 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 55 degrees of freedom
# Null hypothesis probability = 5.204162e-01
Photon flux (15-150 keV) in 0.776 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] : 19.3689 (-1.93716 2.19199)
R^2/D10^2 : 0.204705 (-0.0613922 0.0858706)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.81 using 59 PHA bins.
# Reduced chi-squared = 1.470 for 57 degrees of freedom
# Null hypothesis probability = 1.192230e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.163e-08 2.014e-09
25- 50 5.670e-08 6.421e-09
50-150 1.569e-07 2.200e-08
15-150 2.252e-07 2.464e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.5983 -200)
Norm : 16.4916 (-1.33901 1.33901)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.440902e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.187e-08 3.504e-09
25- 50 6.131e-08 7.977e-09
50-150 1.345e-07 5.062e-08
15-150 2.277e-07 5.191e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.32941 (-1.72289 2.33552)
R1^2/D10^2 : 4.49078 (-2.93414 10.7752)
kT2 [keV] : 26.8969 (-4.19586 6.84371)
R2^2/D10^2 : 6.00181E-02 (-0.0327951 0.0490655)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.18 using 59 PHA bins.
# Reduced chi-squared = 0.9487 for 55 degrees of freedom
# Null hypothesis probability = 5.830119e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.557e-08 1.158e-08
25- 50 5.536e-08 1.576e-08
50-150 1.774e-07 4.753e-08
15-150 2.584e-07 6.833e-08
Peak spectrum fit
Power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29694 ( -0.138474 0.138631 )
Norm@50keV : 2.70629E-02 ( -0.00223298 0.00223245 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9572 for 57 degrees of freedom
# Null hypothesis probability = 5.672454e-01
Photon flux (15-150 keV) in 1 sec: 3.22687 ( -0.275198 0.275622 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6763e-07 ( -2.41307e-08 2.4221e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.834167 ( -0.609555 0.513638 )
Epeak [keV] : 140.962 ( -51.059 -140.962 )
Norm@50keV : 4.42716E-02 ( -0.0181154 0.0382073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9360 for 56 degrees of freedom
# Null hypothesis probability = 6.114167e-01
Photon flux (15-150 keV) in 1 sec: 3.17235 ( -0.2828 0.28278 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63447e-07 ( -2.5102e-08 2.5004e-08 ) ergs/cm2
Band function
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834460 ( -0.296741 0.657667 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 140.991 ( -36.1464 -140.991 )
Norm@50keV : 4.42563E-02 ( -0.018105 0.0160432 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 55 degrees of freedom
# Null hypothesis probability = 5.740545e-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] : 18.7997 (-1.86977 2.12032)
R^2/D10^2 : 0.182206 (-0.0549538 0.0769614)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.73 using 59 PHA bins.
# Reduced chi-squared = 1.364 for 57 degrees of freedom
# Null hypothesis probability = 3.537443e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.271e-08 2.158e-09
25- 50 6.066e-08 7.500e-09
50-150 1.572e-07 2.235e-08
15-150 2.306e-07 2.300e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-22.7645 -200)
Norm : 13.4412 (-1.12057 1.12057)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.647489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.348e-08 3.195e-09
25- 50 6.440e-08 1.507e-08
50-150 1.412e-07 4.931e-08
15-150 2.391e-07 5.900e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.94975 (-1.889 2.64972)
R1^2/D10^2 : 4.43765 (-3.17413 16.5884)
kT2 [keV] : 25.0583 (-3.86449 6.44344)
R2^2/D10^2 : 6.10524E-02 (-0.0344191 0.0454531)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.32 using 59 PHA bins.
# Reduced chi-squared = 0.9332 for 55 degrees of freedom
# Null hypothesis probability = 6.158762e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.727e-08 1.283e-08
25- 50 5.797e-08 1.740e-08
50-150 1.776e-07 4.806e-08
15-150 2.629e-07 6.660e-08
Plot creation:
Tue Jul 26 18:33:46 EDT 2016