batgrbproduct Analysis for Trigger=731725
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Jan 11 18:02:18 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger731725/GCN5_download_cron
======================================================================
Trigger: 00731725 Segment: 000
BAT Trigger Time: 505762832 [s; MET]
Trigger Stop: 505762896 [s; MET]
UTC: 2017-01-10T17:40:13.559480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 259.901957633053 Dec: -25.0040461806935 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10.25
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.25
Flight Position: [ source = BAT ]
RA: 259.901957633053 Dec: -25.0040461806935 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 259.886166997022 Dec: -25.0131052644495 [deg; J2000]
{ 17h 19m 32.7s , -25d 00' 47.2" }
+/- 1.3943921035143 [arcmin] (estimated 90% radius based on SNR)
+/- 0.621780491009639 [arcmin] (formal 1-sigma fit error)
SNR: 18.9170850387202
Angular difference between Flight and Ground position is 1.016196 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 711.46799993515 +/- 242.243310593731
Measured from: -8.70399987697601
to: 702.764000058174 [s; relative to TRIGTIME]
T50: 336.991999924183 +/- 73.4292753996847
Measured from: 125.160000145435
to: 462.152000069618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.26399999856949
to: 2.26399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.6240000128746
to: 943.128000020981 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.791403 8.896485 4.942460 0.248654
0.317898 0.299416 0.256168 0.220777 [error]
Peak 0.024294 0.039209 0.013723 0.009341
0.009959 0.009662 0.008278 0.006747 [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 2.79e-06 3.84e-06 3.89e-06 7.17e-06 1.28e-05 1.77e-05 erg/cm2
Error 1.96e-07 1.66e-07 2.56e-07 9.77e-07 5.96e-07 1.21e-06 erg/cm2
Peak flux Power-law 3.16e-01 2.53e-01 1.36e-01 1.07e-01 7.54e-01 8.12e-01 ph/cm2/s
Error 1.46e-01 8.10e-02 6.53e-02 1.01e-01 2.43e-01 2.62e-01 ph/cm2/s
Fluence Cutoff-PL 2.37e-06 4.19e-06 3.90e-06 1.96e-06 1.18e-05 1.24e-05 erg/cm2
Error 2.40e-07 2.10e-07 2.93e-07 8.34e-07 6.76e-07 1.08e-06 erg/cm2
Peak flux Cutoff-PL 2.80e-01 2.94e-01 1.31e-01 2.21e-02 7.22e-01 7.26e-01 ph/cm2/s
Error 1.62e-01 1.18e-01 1.05e-01 1.05e-01 2.48e-01 2.53e-01 ph/cm2/s
Fluence Band 2.35e-06 4.17e-06 3.90e-06 1.97e-06 1.18e-05 1.24e-05 erg/cm2
Error 2.16e-07 2.05e-07 -------- -------- 6.56e-07 8.26e-07 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 1.979 0.081 - - 1.43e-03 6.88e-05 95.130 57
CPL 0.940 0.397 47.2 4.9 5.03e-03 2.52e-03 69.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.893 0.579 - - 5.27e-03 1.98e-03 51.720 57
CPL 0.549 4.176 44.4 0.0 3.19e-02 0.00e+00 50.930 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 972.752 -29.624 943.128
T90 711.468 -8.704 702.764
T50 336.992 125.160 462.152
Peak 1.000 1.264 2.264
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
259.8862 -25.0131 0.0100 33.5 -64.1 24.2562 18.9 TRIG_00731725
------------------------------------------
Foreground time interval of the image:
-16.599 843.460 (delta_t = 860.059 [sec])
845.000 943.128 (delta_t = 98.128 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-29.624000 843.460000
845.000000 943.128000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97949 ( -0.0807352 0.0820176 )
Norm@50keV : 1.43299E-03 ( -6.89872e-05 6.85787e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.13 using 59 PHA bins.
# Reduced chi-squared = 1.669 for 57 degrees of freedom
# Null hypothesis probability = 1.147876e-03
Photon flux (15-150 keV) in 971.2 sec: 0.212946 ( -0.00966812 0.00969674 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28214e-05 ( -5.94644e-07 5.97799e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-29.624000 843.460000
845.000000 943.128000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940379 ( -0.41376 0.379483 )
Epeak [keV] : 47.2314 ( -4.58456 5.23687 )
Norm@50keV : 5.02690E-03 ( -0.00182303 0.00322113 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.96 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 56 degrees of freedom
# Null hypothesis probability = 9.942702e-02
Photon flux (15-150 keV) in 971.2 sec: 0.199146 ( -0.010617 0.010667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17722e-05 ( -6.70614e-07 6.82365e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-29.624000 843.460000
845.000000 943.128000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.940268 ( -0.252396 0.611227 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 47.2214 ( -4.57884 5.23554 )
Norm@50keV : 5.02742E-03 ( -0.00182258 0.0032259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.96 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 55 degrees of freedom
# Null hypothesis probability = 8.431909e-02
Photon flux (15-150 keV) in 971.2 sec: 0.201064 ( 6.79894 -0.012811 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17685e-05 ( -1.17617e-05 -6.75081e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6955 ( )
R^2/D10^2 : 5.30528E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.77 using 59 PHA bins.
# Reduced chi-squared = 2.3643 for 57 degrees of freedom
# Null hypothesis probability = 3.041633e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.487e-06 1.214e-07
25- 50 4.538e-06 2.253e-07
50-150 3.668e-06 3.559e-07
15-150 9.693e-06 4.812e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.9559 (-9.25056 11.4386)
Norm : 1.01216 (-0.0718566 0.0783567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.66 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 57 degrees of freedom
# Null hypothesis probability = 7.905673e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.536e-06 1.588e-07
25- 50 4.093e-06 1.724e-07
50-150 5.472e-06 5.322e-07
15-150 1.210e-05 6.361e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29463 (-1.1013 1.28769)
R1^2/D10^2 : 0.589130 (-0.316765 0.951861)
kT2 [keV] : 15.9831 (-1.70081 2.46646)
R2^2/D10^2 : 1.28475E-02 (-0.00621693 0.00843029)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.01 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Null hypothesis probability = 8.362413e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.399e-06 5.769e-07
25- 50 4.077e-06 6.803e-07
50-150 5.016e-06 7.750e-07
15-150 1.149e-05 1.698e-06
Peak spectrum fit
Power-law model
Time interval is from 1.264 sec. to 2.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89257 ( -0.542381 0.615316 )
Norm@50keV : 5.26798E-03 ( -0.00202913 0.00193757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.72 using 59 PHA bins.
# Reduced chi-squared = 0.9074 for 57 degrees of freedom
# Null hypothesis probability = 6.727018e-01
Photon flux (15-150 keV) in 1 sec: 0.753632 ( -0.24255 0.242993 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84311e-08 ( -1.75297e-08 1.84252e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.264 sec. to 2.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.549022 ( -6.74535 1.60664 )
Epeak [keV] : 44.3758 ( )
Norm@50keV : 3.18505E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.93 using 59 PHA bins.
# Reduced chi-squared = 0.9094 for 56 degrees of freedom
# Null hypothesis probability = 6.668067e-01
Photon flux (15-150 keV) in 1 sec: 0.722252 ( -0.245456 0.249875 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27601e-08 ( -1.78176e-08 2.11658e-08 ) ergs/cm2
Band function
Time interval is from 1.264 sec. to 2.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.73774 ( -4.73774 -4.73774 )
beta : -2.51539 ( -2.45601 0.877397 )
Epeak [keV] : 30.5623 ( -30.5623 9.55146 )
Norm@50keV : 162.139 ( -50.1972 7.43873e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.92 using 59 PHA bins.
# Reduced chi-squared = 0.9076 for 55 degrees of freedom
# Null hypothesis probability = 6.687500e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41379e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0605 (-3.07898 4.74494)
R^2/D10^2 : 0.357639 (-0.357307 1.08707)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.76 using 59 PHA bins.
# Reduced chi-squared = 0.9081 for 57 degrees of freedom
# Null hypothesis probability = 6.712559e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.387e-09 4.619e-09
25- 50 1.852e-08 1.130e-08
50-150 9.837e-09 7.065e-09
15-150 3.575e-08 2.246e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.3051 (-44.3943 -75.3046)
Norm : 3.65921 (-1.41627 2.52597)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.12 using 59 PHA bins.
# Reduced chi-squared = 0.8968 for 57 degrees of freedom
# Null hypothesis probability = 6.942048e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.453e-09 5.770e-09
25- 50 1.533e-08 9.565e-09
50-150 2.076e-08 1.827e-08
15-150 4.554e-08 2.995e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.35343 (-6.98148 3.15849)
R1^2/D10^2 : 0.888211 (-0.862993 -0.862993)
kT2 [keV] : 22.9904 (-23.3098 -23.3098)
R2^2/D10^2 : 8.49681E-03 (-0.00788892 0.93036)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.36 using 59 PHA bins.
# Reduced chi-squared = 0.9166 for 55 degrees of freedom
# Reduced chi-squared = 0.9157 for 55 degrees of freedom
# Null hypothesis probability = 6.503014e-01
# Null hypothesis probability = 6.521737e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.001e-09 6.290e-09
25- 50 1.655e-08 9.330e-09
50-150 1.869e-08 1.431e-08
15-150 4.424e-08 2.494e-08
Plot creation:
Wed Jan 11 18:21:32 EST 2017