batgrbproduct Analysis for Trigger=647642
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 Jul 3 05:12:25 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger647642/GCN5_download_cron
======================================================================
Trigger: 00647642 Segment: 000
BAT Trigger Time: 457513160 [s; MET]
Trigger Stop: 457513224 [s; MET]
UTC: 2015-07-02T06:59:05.203260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 161.248330563731 Dec: 55.9895486079891 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.91
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.91
Flight Position: [ source = BAT ]
RA: 161.248330563731 Dec: 55.9895486079891 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 161.305478023688 Dec: 55.9898810325253 [deg; J2000]
{ 10h 45m 13.3s , +55d 59' 23.6" }
+/- 4.3261832887629 [arcmin] (estimated 90% radius based on SNR)
+/- 2.55960621102889 [arcmin] (formal 1-sigma fit error)
SNR: 3.75315994116592
Angular difference between Flight and Ground position is 1.918001 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.143405 0.179750 0.021973 0.015635
0.050041 0.051839 0.046198 0.043393 [error]
Peak 0.143405 0.179750 0.021973 0.015635
0.050041 0.051839 0.046198 0.043393 [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 4.74e-08 5.79e-08 5.16e-08 7.78e-08 1.84e-07 2.28e-07 erg/cm2
Error 2.25e-08 2.43e-08 3.35e-08 1.05e-07 8.73e-08 1.46e-07 erg/cm2
Peak flux Power-law 2.43e-02 1.64e-02 7.24e-03 4.39e-03 5.01e-02 5.22e-02 ph/cm2/s
Error 1.17e-02 6.78e-03 4.61e-03 5.61e-03 2.05e-02 2.17e-02 ph/cm2/s
Fluence Cutoff-PL 4.09e-08 1.01e-07 1.88e-08 4.28e-11 1.61e-07 1.61e-07 erg/cm2
Error 2.56e-08 3.85e-08 3.04e-08 2.88e-09 6.16e-08 6.16e-08 erg/cm2
Peak flux Cutoff-PL 1.97e-02 2.89e-02 3.15e-03 3.89e-06 5.18e-02 5.18e-02 ph/cm2/s
Error 1.29e-02 1.06e-02 4.68e-03 2.41e-04 1.84e-02 1.84e-02 ph/cm2/s
Fluence Band 4.06e-08 1.01e-07 2.42e-08 2.19e-10 1.66e-07 1.66e-07 erg/cm2
Error 2.34e-08 3.74e-08 -------- -------- -------- -------- 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 2.174 0.640 - - 3.06e-04 1.58e-04 67.280 57
CPL -4.900 0.000 33.0 7.6 1.17e+01 0.00e+00 58.860 56
The chi2 of BB fit is 59.68 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 2.174 0.640 - - 3.06e-04 1.58e-04 67.280 57
CPL -4.900 0.000 33.0 7.6 1.17e+01 0.00e+00 58.860 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
161.3055 +55.9899 0.0510 36.3 -20.6 0.3938 3.8 TRIG_00647642
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17363 ( -0.595719 0.683399 )
Norm@50keV : 3.06157E-04 ( -0.000155822 0.000160989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.28 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.656301e-01
Photon flux (15-150 keV) in 64 sec: 5.00806E-02 ( -0.020511 0.02053 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83605e-07 ( -8.21478e-08 9.25088e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.89958 ( )
Epeak [keV] : 32.9743 ( -6.63676 8.60496 )
Norm@50keV : 11.6678 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 56 degrees of freedom
# Null hypothesis probability = 3.711560e-01
Photon flux (15-150 keV) in 64 sec: 5.17825E-02 ( -0.018079 0.0187291 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60965e-07 ( -5.84435e-08 6.46707e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.63589 ( -4.68588 -4.63589 )
beta : -9.31479 ( 9.31479 19.275 )
Epeak [keV] : 33.6557 ( -7.3691 7.69392 )
Norm@50keV : 7.00040 ( -2.32454 86.639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.87 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.359566e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65983e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.61291 (-2.11814 2.73789)
R^2/D10^2 : 5.17590E-02 (-0.0518306 0.104579)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.68 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.785226e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.669e-08 2.862e-08
25- 50 9.251e-08 5.661e-08
50-150 3.079e-08 2.378e-08
15-150 1.700e-07 1.109e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.9992 (-19.572 58.6096)
Norm : 0.357949 (-0.170892 0.286946)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.27 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.369343e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.215e-08 3.270e-08
25- 50 6.785e-08 4.384e-08
50-150 5.105e-08 4.480e-08
15-150 1.711e-07 1.180e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.27247 (-8.96565 -8.96565)
R1^2/D10^2 : 4.49700E-03 (-0.00522092 -0.00522092)
kT2 [keV] : 8.73404 (-8.66663 -8.66663)
R2^2/D10^2 : 4.54086E-02 (-0.046158 -0.046158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.093099e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.611e-08 7.776e-03
25- 50 9.283e-08 6.275e-02
50-150 3.191e-08 1.434e+00
15-150 1.708e-07 1.584e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17363 ( -0.595719 0.683399 )
Norm@50keV : 3.06157E-04 ( -0.000155822 0.000160989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.28 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.656301e-01
Photon flux (15-150 keV) in 64 sec: 5.00806E-02 ( -0.020511 0.02053 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83605e-07 ( -8.21478e-08 9.25088e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.89958 ( )
Epeak [keV] : 32.9743 ( -6.63676 8.60496 )
Norm@50keV : 11.6678 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 56 degrees of freedom
# Null hypothesis probability = 3.711560e-01
Photon flux (15-150 keV) in 64 sec: 5.17825E-02 ( -0.018079 0.0187291 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60965e-07 ( -5.84435e-08 6.46707e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.63589 ( -4.68588 -4.63589 )
beta : -9.31479 ( 9.31479 19.275 )
Epeak [keV] : 33.6557 ( -7.3691 7.69392 )
Norm@50keV : 7.00040 ( -2.32454 86.639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.87 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.359566e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65983e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.61291 (-2.11814 2.73789)
R^2/D10^2 : 5.17590E-02 (-0.0518306 0.104579)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.68 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.785226e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.669e-08 2.890e-08
25- 50 9.251e-08 5.853e-08
50-150 3.079e-08 2.415e-08
15-150 1.700e-07 1.081e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.9992 (-19.572 58.6096)
Norm : 0.357949 (-0.170892 0.286946)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.27 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.369343e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.215e-08 3.299e-08
25- 50 6.785e-08 4.320e-08
50-150 5.105e-08 4.400e-08
15-150 1.711e-07 1.146e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.27247 (-8.96565 -8.96565)
R1^2/D10^2 : 4.49700E-03 (-0.00522092 -0.00522092)
kT2 [keV] : 8.73404 (-8.66663 -8.66663)
R2^2/D10^2 : 4.54086E-02 (-0.046158 -0.046158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.093099e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.611e-08 7.878e-03
25- 50 9.283e-08 6.758e-02
50-150 3.191e-08 1.454e+00
15-150 1.708e-07 1.636e+00
Plot creation:
Fri Jul 3 05:17:38 EDT 2015