batgrbproduct Analysis for Trigger=643833
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 Jun 15 10:26:43 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger643833/batgroup_hand_proc
======================================================================
Trigger: 00643833 Segment: 000
BAT Trigger Time: 456036160.768 [s; MET]
Trigger Stop: 456036168.96 [s; MET]
UTC: 2015-06-15T04:42:27.048040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 107.570242386832 Dec: -22.471915183491 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.52
Image Trigger?: NO
Rate S/N Ratio: 14.142135623731 [ if not an image trigger ]
Image S/N Ratio: 10.52
Flight Position: [ source = BAT ]
RA: 107.570242386832 Dec: -22.471915183491 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 107.553505090884 Dec: -22.4659914426876 [deg; J2000]
{ 07h 10m 12.8s , -22d 27' 57.6" }
+/- 1.8114120222734 [arcmin] (estimated 90% radius based on SNR)
+/- 0.944971084013098 [arcmin] (formal 1-sigma fit error)
SNR: 13.0173419843234
Angular difference between Flight and Ground position is 0.993738 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 27.5519999861717 +/- 5.14136982655636
Measured from: -2.0120000243187
to: 25.539999961853 [s; relative to TRIGTIME]
T50: 12.0559999346733 +/- 3.39483840244188
Measured from: 2.89200001955032
to: 14.9479999542236 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.80000001192093
to: 6.80000001192093 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.86000001430511
to: 30.1119999885559 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.346979 0.367536 0.216563 0.028297
0.036807 0.036850 0.032306 0.028451 [error]
Peak 0.026546 0.020110 0.017603 0.005316
0.006663 0.006524 0.005813 0.004784 [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 1.06e-07 1.58e-07 1.75e-07 3.69e-07 5.51e-07 8.08e-07 erg/cm2
Error 1.33e-08 1.73e-08 3.18e-08 1.37e-07 7.28e-08 1.68e-07 erg/cm2
Peak flux Power-law 2.43e-01 1.88e-01 9.73e-02 7.28e-02 5.61e-01 6.00e-01 ph/cm2/s
Error 1.06e-01 5.36e-02 4.98e-02 7.58e-02 1.60e-01 1.74e-01 ph/cm2/s
Fluence Cutoff-PL 1.05e-07 1.59e-07 1.76e-07 3.39e-07 5.48e-07 7.77e-07 erg/cm2
Error 1.86e-08 2.04e-08 3.19e-08 2.18e-07 7.83e-08 2.33e-07 erg/cm2
Peak flux Cutoff-PL 2.44e-01 1.88e-01 9.65e-02 7.10e-02 5.61e-01 5.99e-01 ph/cm2/s
Error 1.06e-01 5.45e-02 4.82e-02 9.01e-02 1.60e-01 1.72e-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 1.845 0.210 - - 1.82e-03 2.37e-04 47.650 57
CPL 1.809 0.875 239.2 0.0 1.90e-03 0.00e+00 47.650 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 1.948 0.644 - - 3.83e-03 1.47e-03 63.790 57
CPL 3.849 0.000 452.9 -189.6 5.03e-04 3.75e-03 61.970 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 32.972 -2.860 30.112
T90 27.552 -2.012 25.540
T50 12.056 2.892 14.948
Peak 1.000 5.800 6.800
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
107.5535 -22.4660 0.0148 28.1318 -176.2472 0.9311126 13.017 TRIG_00643833
Foreground time interval of the image:
-2.860 30.112 (delta_t = 32.972 [sec])
Background time interval of the image:
-525.667 -509.378 (delta_t = 16.289 [sec])
-239.768 -2.860 (delta_t = 236.908 [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 -2.860 sec. to 30.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84461 ( -0.205117 0.215022 )
Norm@50keV : 1.81602E-03 ( -0.000240594 0.000234319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.65 using 59 PHA bins.
# Reduced chi-squared = 0.8360 for 57 degrees of freedom
# Null hypothesis probability = 8.064489e-01
Photon flux (15-150 keV) in 32.97 sec: 0.254704 ( -0.0281654 0.028185 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50576e-07 ( -7.21684e-08 7.34934e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.860 sec. to 30.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80918 ( -0.84385 0.905273 )
Epeak [keV] : 239.161 ( )
Norm@50keV : 1.89959E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.65 using 59 PHA bins.
# Reduced chi-squared = 0.8509 for 56 degrees of freedom
# Null hypothesis probability = 7.788557e-01
Photon flux (15-150 keV) in 32.97 sec: 0.254468 ( -0.028978 0.028386 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48446e-07 ( -8.15711e-08 7.50793e-08 ) ergs/cm2
Band function
Time interval is from -2.860 sec. to 30.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71038 ( 1.711 6.25661 )
beta : -1.90658 ( 1.90209 0.26261 )
Epeak [keV] : 87.8961 ( -92.9706 -92.9706 )
Norm@50keV : 2.17300E-03 ( -0.000542147 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.65 using 59 PHA bins.
# Reduced chi-squared = 0.8664 for 55 degrees of freedom
# Null hypothesis probability = 7.485313e-01
Photon flux (15-150 keV) in 32.97 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] : 11.2266 (-1.53169 1.79092)
R^2/D10^2 : 7.60516E-02 (-0.0321034 0.0552822)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.64 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 57 degrees of freedom
# Null hypothesis probability = 1.058566e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.628e-08 1.337e-08
25- 50 1.924e-07 3.193e-08
50-150 1.391e-07 4.314e-08
15-150 3.977e-07 5.890e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.7659 (-31.8426 65.9909)
Norm : 1.13256 (-0.170301 0.215832)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.76 using 59 PHA bins.
# Reduced chi-squared = 0.8554 for 57 degrees of freedom
# Null hypothesis probability = 7.731868e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.755e-08 1.619e-08
25- 50 1.668e-07 2.253e-08
50-150 2.621e-07 1.129e-07
15-150 5.264e-07 1.441e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.18197 (-2.27776 3.14558)
R1^2/D10^2 : 0.942162 (-0.725959 11.4693)
kT2 [keV] : 19.7582 (-6.26265 23.4562)
R2^2/D10^2 : 7.33855E-03 (-0.00645449 0.0247423)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
# Reduced chi-squared = 0.9169 for 55 degrees of freedom
# Null hypothesis probability = 6.496456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.053e-07 5.188e-08
25- 50 1.524e-07 7.324e-08
50-150 2.641e-07 1.498e-07
15-150 5.218e-07 2.156e-07
Peak spectrum fit
Power-law model
Time interval is from 5.800 sec. to 6.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94790 ( -0.574418 0.713621 )
Norm@50keV : 3.82876E-03 ( -0.00157224 0.00137764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.79 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.499957e-01
Photon flux (15-150 keV) in 1 sec: 0.560984 ( -0.160053 0.160075 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52312e-08 ( -1.25806e-08 1.31232e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.800 sec. to 6.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.84854 ( )
Epeak [keV] : 452.868 ( -73.1815 -452.444 )
Norm@50keV : 5.02552E-04 ( -0.000505489 0.00699224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 56 degrees of freedom
# Null hypothesis probability = 2.715611e-01
Photon flux (15-150 keV) in 1 sec: 0.560893 ( -0.159804 0.159849 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51238e-08 ( -1.24761e-08 1.28975e-08 ) ergs/cm2
Band function
Time interval is from 5.800 sec. to 6.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49903 ( 1.50243 1.50243 )
beta : -1.93233 ( 1.93915 0.565872 )
Epeak [keV] : 17.2846 ( -13.3719 -13.3719 )
Norm@50keV : 1.00176E-02 ( -0.0106377 103.539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 55 degrees of freedom
# Null hypothesis probability = 1.947018e-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] : 9.88187 (-3.3558 6.33811)
R^2/D10^2 : 0.257571 (-0.256108 0.99989)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.88 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.176365e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.101e-09 3.218e-09
25- 50 1.247e-08 7.545e-09
50-150 6.288e-09 4.493e-09
15-150 2.386e-08 1.452e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.5072 (-90.5703 -90.5703)
Norm : 2.49265 (-0.880062 1.85781)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.84 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.221016e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.505e-09 4.008e-09
25- 50 1.102e-08 6.690e-09
50-150 1.683e-08 1.419e-08
15-150 3.435e-08 2.451e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.11704 (-2.11683 6.2133)
R1^2/D10^2 : 344.089 (-342.297 -342.819)
kT2 [keV] : 15.9091 (-7.07323 66.648)
R2^2/D10^2 : 3.93267E-02 (-0.0363121 0.0744173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.142343e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.213e-09 3.563e-09
25- 50 8.812e-09 5.310e-09
50-150 1.523e-08 9.665e-09
15-150 3.126e-08 1.737e-08
Plot creation:
Mon Jun 15 10:33:52 EDT 2015