batgrbproduct Analysis for Trigger=644520
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): Fri Jun 19 03:42:42 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger644520/GCN5_download_cron
======================================================================
Trigger: 00644520 Segment: 000
BAT Trigger Time: 456281058.752 [s; MET]
Trigger Stop: 456281060.8 [s; MET]
UTC: 2015-06-18T00:44:05.019320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 306.012213123259 Dec: 33.8669881293713 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.2
Image Trigger?: NO
Rate S/N Ratio: 6.48074069840786 [ if not an image trigger ]
Image S/N Ratio: 6.2
Flight Position: [ source = BAT ]
RA: 306.012213123259 Dec: 33.8669881293713 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 305.990461821408 Dec: 33.8506509710213 [deg; J2000]
{ 20h 23m 57.7s , +33d 51' 02.3" }
+/- 1.95811681469627 [arcmin] (estimated 90% radius based on SNR)
+/- 0.994917890552381 [arcmin] (formal 1-sigma fit error)
SNR: 11.6467860832834
Angular difference between Flight and Ground position is 1.461291 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 237.895999968052 +/- 78.0704879732217
Measured from: -0.139999866485596
to: 237.756000101566 [s; relative to TRIGTIME]
T50: 154.167999982834 +/- 8.98211914963053
Measured from: 57.2120001316071
to: 211.380000114441 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 217.776000022888
to: 218.776000022888 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.2919999957085
to: 352.816000044346 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.450976 2.902033 1.987743 0.408941
0.106718 0.108101 0.091184 0.074143 [error]
Peak 0.036089 0.049486 0.038908 0.009870
0.006093 0.006171 0.005400 0.003969 [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 6.71e-07 1.15e-06 1.50e-06 3.96e-06 4.40e-06 7.28e-06 erg/cm2
Error 5.21e-08 5.27e-08 8.97e-08 5.17e-07 2.12e-07 5.81e-07 erg/cm2
Peak flux Power-law 3.40e-01 3.54e-01 2.60e-01 3.08e-01 1.07e+00 1.26e+00 ph/cm2/s
Error 7.75e-02 4.86e-02 4.34e-02 1.08e-01 1.39e-01 1.66e-01 ph/cm2/s
Fluence Cutoff-PL 6.51e-07 1.17e-06 1.51e-06 2.96e-06 4.33e-06 6.29e-06 erg/cm2
Error 6.15e-08 6.14e-08 9.38e-08 1.09e-06 2.42e-07 1.19e-06 erg/cm2
Peak flux Cutoff-PL 3.44e-01 3.55e-01 2.58e-01 3.00e-01 1.07e+00 1.26e+00 ph/cm2/s
Error 7.89e-02 4.91e-02 4.35e-02 1.15e-01 1.39e-01 1.89e-01 ph/cm2/s
Fluence Band 7.41e-07 1.45e-06 1.63e-06 3.40e-06 4.86e-06 7.23e-06 erg/cm2
Error 9.57e-08 1.07e-07 1.43e-07 -------- 3.33e-07 -------- erg/cm2
Peak flux Band 1.49e-01 2.63e-01 1.86e-01 1.80e-01 6.71e-01 7.81e-01 ph/cm2/s
Error 1.04e-01 -------- 4.40e-02 -------- 1.32e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.617 0.081 - - 1.30e-03 5.85e-05 50.240 57
CPL 1.434 0.271 153.0 0.0 1.61e-03 0.00e+00 49.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.445 0.233 - - 8.72e-03 1.14e-03 43.960 57
CPL 1.437 0.000 9999.0 0.0 8.75e-03 0.00e+00 43.970 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: 217.088000 sec.
T50 in the 50-300 keV band: 152.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 363.108 -10.292 352.816
T90 237.896 -0.140 237.756
T50 154.168 57.212 211.380
Peak 1.000 217.776 218.776
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
305.9905 +33.8507 0.0165 7.7 74.0 0.7406 11.6 TRIG_00644520
------------------------------------------
Foreground time interval of the image:
-10.292 22.749 (delta_t = 33.041 [sec])
Background time interval of the image:
-239.752 -57.162 (delta_t = 182.590 [sec])
-55.752 -10.292 (delta_t = 45.460 [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
Multiple GTIs in the spectrum
tstart tstop
-10.292000 47.538000
48.248000 352.816000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61671 ( -0.0811023 0.0814441 )
Norm@50keV : 1.30018E-03 ( -5.85473e-05 5.83769e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.24 using 59 PHA bins.
# Reduced chi-squared = 0.8814 for 57 degrees of freedom
# Null hypothesis probability = 7.246982e-01
Photon flux (15-150 keV) in 362.4 sec: 0.167956 ( -0.00763673 0.00765107 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.39791e-06 ( -2.11712e-07 2.12703e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-10.292000 47.538000
48.248000 352.816000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43449 ( -0.318479 0.222895 )
Epeak [keV] : 153.042 ( )
Norm@50keV : 1.60853E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.16 using 59 PHA bins.
# Reduced chi-squared = 0.8778 for 56 degrees of freedom
# Null hypothesis probability = 7.294421e-01
Photon flux (15-150 keV) in 362.4 sec: 0.166102 ( -0.008184 0.008184 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32789e-06 ( -2.42627e-07 2.41648e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-10.292000 47.538000
48.248000 352.816000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88011 ( -13.9526 -4.88011 )
beta : -1.67977 ( -0.0925767 0.0902755 )
Epeak [keV] : 23.5491 ( -3.69733 2.84147 )
Norm@50keV : 177.015 ( -7.66182 640.279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.8163 for 55 degrees of freedom
# Null hypothesis probability = 8.326866e-01
Photon flux (15-150 keV) in 362.4 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86352e-06 ( -4.86098e-06 -3.3243e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1543 ( )
R^2/D10^2 : 2.19701E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 174.23 using 59 PHA bins.
# Reduced chi-squared = 3.0567 for 57 degrees of freedom
# Null hypothesis probability = 8.344765e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.366e-07 2.832e-08
25- 50 1.265e-06 7.049e-08
50-150 1.679e-06 1.500e-07
15-150 3.281e-06 1.674e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.016 (-36.245 -171.593)
Norm : 0.681282 (-0.0336249 0.0370409)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.82 using 59 PHA bins.
# Reduced chi-squared = 0.8741 for 57 degrees of freedom
# Null hypothesis probability = 7.387190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.258e-07 4.095e-08
25- 50 1.182e-06 1.219e-07
50-150 2.462e-06 7.821e-07
15-150 4.270e-06 8.942e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54617 (-0.874722 1.00471)
R1^2/D10^2 : 0.236621 (-0.0918345 0.163106)
kT2 [keV] : 25.0702 (-3.32934 4.92487)
R2^2/D10^2 : 2.29392E-03 (-0.00107835 0.00158871)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.09 using 59 PHA bins.
# Reduced chi-squared = 0.8743 for 55 degrees of freedom
# Null hypothesis probability = 7.339558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.383e-07 8.643e-08
25- 50 1.171e-06 1.183e-07
50-150 2.484e-06 3.921e-07
15-150 4.293e-06 5.521e-07
Peak spectrum fit
Power-law model
Time interval is from 217.776 sec. to 218.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44485 ( -0.232087 0.234906 )
Norm@50keV : 8.72048E-03 ( -0.00114721 0.00113691 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7713 for 57 degrees of freedom
# Null hypothesis probability = 8.970724e-01
Photon flux (15-150 keV) in 1 sec: 1.07331 ( -0.138501 0.13882 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35256e-08 ( -1.22267e-08 1.23896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 217.776 sec. to 218.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43707 ( )
Epeak [keV] : 9998.99 ( )
Norm@50keV : 8.74893E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.97 using 59 PHA bins.
# Reduced chi-squared = 0.7852 for 56 degrees of freedom
# Null hypothesis probability = 8.781247e-01
Photon flux (15-150 keV) in 1 sec: 1.07444 ( -0.14018 0.13741 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30463e-08 ( -1.17527e-08 1.2715e-08 ) ergs/cm2
Band function
Time interval is from 217.776 sec. to 218.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19388 ( 1.19388 1.19388 )
beta : -1.44481 ( -0.234778 0.232188 )
Epeak [keV] : 26.4840 ( -26.484 -26.484 )
Norm@50keV : 1.76179E-02 ( -0.0100044 1.32214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7993 for 55 degrees of freedom
# Null hypothesis probability = 8.571177e-01
Photon flux (15-150 keV) in 1 sec: 0.671229 ( 6.32877 -0.131625 ) 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] : 14.8521 (-2.3978 3.09449)
R^2/D10^2 : 0.124318 (-0.0596855 0.10606)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.050824e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.750e-09 1.468e-09
25- 50 2.264e-08 4.260e-09
50-150 3.384e-08 8.565e-09
15-150 6.223e-08 1.194e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.39294 (-0.559731 0.559704)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.7977 for 57 degrees of freedom
# Null hypothesis probability = 8.642002e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.094e-08 6.095e-09
25- 50 2.105e-08 1.156e-08
50-150 4.616e-08 2.590e-08
15-150 7.815e-08 4.298e-08
Double BB
R1^2/D10^2 : 0.364213 (-0.212926 0.317052)
kT2 [keV] : 93.3253 (-65.1842 -83.5852)
R2^2/D10^2 : 4.80559E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.55 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.40 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8827 for 55 degrees of freedom
# Reduced chi-squared = 0.8437 for 55 degrees of freedom
# Reduced chi-squared = 0.8432 for 55 degrees of freedom
# Null hypothesis probability = 7.180201e-01
# Null hypothesis probability = 7.888534e-01
# Null hypothesis probability = 7.896753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.108e-08 5.949e-09
25- 50 1.811e-08 7.391e-09
50-150 4.851e-08 2.703e-08
15-150 7.770e-08 2.865e-08
Plot creation:
Fri Jun 19 03:46:40 EDT 2015