batgrbproduct Analysis for Trigger=652643
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): Thu Aug 20 04:19:07 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger652643/GCN5_download_cron
======================================================================
Trigger: 00652643 Segment: 000
BAT Trigger Time: 461638224 [s; MET]
Trigger Stop: 461638288 [s; MET]
UTC: 2015-08-19T00:50:08.987220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 42.336760697218 Dec: 9.78396975898111 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.26
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.26
Flight Position: [ source = BAT ]
RA: 42.336760697218 Dec: 9.78396975898111 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.3183646129201 Dec: 9.78849796127067 [deg; J2000]
{ 02h 49m 16.4s , +09d 47' 18.6" }
+/- 2.49710286628119 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10107887685605 [arcmin] (formal 1-sigma fit error)
SNR: 8.22909444828654
Angular difference between Flight and Ground position is 1.121123 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 51.7120000720024 +/- 13.6750329753984
Measured from: 17.1920000910759
to: 68.9040001630783 [s; relative to TRIGTIME]
T50: 23.120000064373 +/- 10.7074941552983
Measured from: 28.3760001063347
to: 51.4960001707077 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.6759999990463
to: 18.6759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: 13.9760000109673
to: 73.4480000138283 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.264046 0.319732 0.175145 0.098470
0.043360 0.044122 0.038233 0.033838 [error]
Peak 0.016803 0.011375 0.007274 0.006764
0.005552 0.005727 0.004839 0.004493 [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 7.91e-08 1.27e-07 1.54e-07 3.64e-07 4.64e-07 7.24e-07 erg/cm2
Error 1.82e-08 1.96e-08 3.66e-08 1.77e-07 8.62e-08 2.13e-07 erg/cm2
Peak flux Power-law 1.64e-01 1.02e-01 4.09e-02 2.20e-02 3.18e-01 3.29e-01 ph/cm2/s
Error 8.48e-02 5.01e-02 3.72e-02 4.29e-02 1.32e-01 1.41e-01 ph/cm2/s
Fluence Cutoff-PL 7.48e-08 1.37e-07 1.52e-07 1.31e-07 4.34e-07 4.95e-07 erg/cm2
Error 2.05e-08 2.79e-08 4.22e-08 2.65e-07 1.01e-07 2.86e-07 erg/cm2
Peak flux Cutoff-PL 1.66e-01 1.01e-01 3.89e-02 1.98e-02 3.18e-01 3.28e-01 ph/cm2/s
Error 1.05e-01 5.59e-02 -------- 4.28e-02 -------- 1.40e-01 ph/cm2/s
Fluence Band 7.30e-08 1.40e-07 1.47e-07 2.29e-07 4.39e-07 5.90e-07 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 1.724 0.276 - - 8.44e-04 1.49e-04 45.290 57
CPL 1.112 1.200 62.8 -9.4 1.88e-03 6.81e-03 44.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.321 1.112 - - 1.80e-03 1.52e-03 56.390 57
CPL 1.888 0.000 12.0 0.0 3.12e-03 0.00e+00 56.560 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 59.472 13.976 73.448
T90 51.712 17.192 68.904
T50 23.120 28.376 51.496
Peak 1.000 17.676 18.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
42.3184 +9.7885 0.0232 22.8 -5.4 0.7615 8.2 TRIG_00652643
------------------------------------------
Foreground time interval of the image:
13.976 70.901 (delta_t = 56.925 [sec])
Background time interval of the image:
-239.000 13.976 (delta_t = 252.976 [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 13.976 sec. to 73.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72412 ( -0.269205 0.281936 )
Norm@50keV : 8.44369E-04 ( -0.000151114 0.000147345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.29 using 59 PHA bins.
# Reduced chi-squared = 0.7945 for 57 degrees of freedom
# Null hypothesis probability = 8.684328e-01
Photon flux (15-150 keV) in 59.47 sec: 0.113103 ( -0.0175382 0.0175435 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64103e-07 ( -8.50849e-08 8.73834e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.976 sec. to 73.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11179 ( -1.55263 0.84835 )
Epeak [keV] : 62.7503 ( -43.9295 -62.7692 )
Norm@50keV : 1.87628E-03 ( -0.00115705 0.0124678 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.7951 for 56 degrees of freedom
# Null hypothesis probability = 8.653585e-01
Photon flux (15-150 keV) in 59.47 sec: 0.110565 ( -0.0182809 0.018218 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.34372e-07 ( -9.74862e-08 1.03628e-07 ) ergs/cm2
Band function
Time interval is from 13.976 sec. to 73.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.870885 ( 0.853634 0.853634 )
beta : -2.15348 ( 2.15528 0.640013 )
Epeak [keV] : 53.0490 ( -52.1509 52.5775 )
Norm@50keV : 2.67880E-03 ( -0.00306438 63.5933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.20 using 59 PHA bins.
# Reduced chi-squared = 0.8036 for 55 degrees of freedom
# Null hypothesis probability = 8.511372e-01
Photon flux (15-150 keV) in 59.47 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.39495e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5343 (-1.92815 2.36709)
R^2/D10^2 : 3.21661E-02 (-0.0160631 0.0309153)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.8918 for 57 degrees of freedom
# Null hypothesis probability = 7.042051e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.360e-08 1.439e-08
25- 50 1.608e-07 3.467e-08
50-150 1.252e-07 4.600e-08
15-150 3.396e-07 7.999e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 111.833 (-49.2896 -111.454)
Norm : 0.490238 (-0.0860738 0.122276)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.55 using 59 PHA bins.
# Reduced chi-squared = 0.7816 for 57 degrees of freedom
# Null hypothesis probability = 8.848698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.611e-08 1.746e-08
25- 50 1.345e-07 4.383e-08
50-150 2.315e-07 1.476e-07
15-150 4.421e-07 2.125e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.88666 (-3.87294 5.42222)
R1^2/D10^2 : 0.208448 (-0.137394 7.71949)
kT2 [keV] : 17.9385 (-7.86247 -19.784)
R2^2/D10^2 : 4.63856E-03 (-0.00300801 0.0108108)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.14 using 59 PHA bins.
# Reduced chi-squared = 0.8207 for 55 degrees of freedom
# Null hypothesis probability = 8.260798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.330e-08 4.092e-08
25- 50 1.352e-07 7.166e-08
50-150 1.960e-07 1.190e-07
15-150 4.045e-07 2.116e-07
Peak spectrum fit
Power-law model
Time interval is from 17.676 sec. to 18.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32144 ( -0.851974 1.3713 )
Norm@50keV : 1.80014E-03 ( -0.0018001 0.00122999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.39 using 59 PHA bins.
# Reduced chi-squared = 0.9893 for 57 degrees of freedom
# Null hypothesis probability = 4.978250e-01
Photon flux (15-150 keV) in 1 sec: 0.318391 ( -0.13181 0.131892 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72717e-08 ( -9.24984e-09 1.06314e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.676 sec. to 18.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88752 ( )
Epeak [keV] : 12.0369 ( )
Norm@50keV : 3.12084E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 56 degrees of freedom
# Null hypothesis probability = 4.539244e-01
Photon flux (15-150 keV) in 1 sec: 0.317669 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72293e-08 ( -9.30405e-09 1.04908e-08 ) ergs/cm2
Band function
Time interval is from 17.676 sec. to 18.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.54560 ( 8.5456 8.5456 )
beta : -2.32147 ( -1.3713 0.852782 )
Epeak [keV] : 23.4045 ( -23.4045 -23.4045 )
Norm@50keV : 0.244659 ( -0.244659 0.167174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.39 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.226345e-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] : 8.09385 (-5.26385 8.07172)
R^2/D10^2 : 0.317460 (-0.32024 39.9586)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.40 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.880761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.680e-09 2.980e-09
25- 50 5.512e-09 3.668e-09
50-150 6.895e-10 6.460e-10
15-150 1.088e-08 7.215e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.8220 (-42.8383 -42.8383)
Norm : 1.96589 (-1.09722 5.78233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.90 using 59 PHA bins.
# Reduced chi-squared = 0.9982 for 57 degrees of freedom
# Null hypothesis probability = 4.789467e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.614e-09 2.911e-09
25- 50 6.246e-09 4.077e-09
50-150 5.198e-09 4.461e-09
15-150 1.606e-08 1.082e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.26673 (-2.3767 4.19334)
R1^2/D10^2 : 13.1940 (-12.8358 6176.23)
kT2 [keV] : 15.0994 (-8.25415 -15.1051)
R2^2/D10^2 : 2.22466E-02 (-0.0221941 0.479254)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.470364e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.169e-09 2.862e-09
25- 50 5.039e-09 2.991e-09
50-150 6.601e-09 5.555e-09
15-150 1.681e-08 9.320e-09
Plot creation:
Thu Aug 20 04:23:51 EDT 2015