batgrbproduct Analysis for Trigger=635797
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 Mar 23 01:59:18 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635797/GCN5_download_cron
======================================================================
Trigger: 00635797 Segment: 000
BAT Trigger Time: 448709600 [s; MET]
Trigger Stop: 448709920 [s; MET]
UTC: 2015-03-22T09:33:06.657040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.31601470301 Dec: -33.493767665638 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.84
Flight Position: [ source = BAT ]
RA: 271.31601470301 Dec: -33.493767665638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.333427473675 Dec: -33.521443651479 [deg; J2000]
{ 18h 05m 20.0s , -33d 31' 17.2" }
+/- 2.70757854982966 [arcmin] (estimated 90% radius based on SNR)
+/- 1.12854624746964 [arcmin] (formal 1-sigma fit error)
SNR: 7.33069971844043
Angular difference between Flight and Ground position is 1.875191 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.866957 0.871648 0.322182 -0.064070
0.117022 0.106123 0.086265 0.071238 [error]
Peak 0.866957 0.871648 0.322182 -0.064070
0.117022 0.106123 0.086265 0.071238 [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 2.66e-07 3.11e-07 2.62e-07 3.74e-07 9.74e-07 1.21e-06 erg/cm2
Error 4.96e-08 4.78e-08 7.36e-08 1.99e-07 1.73e-07 2.96e-07 erg/cm2
Peak flux Power-law 2.73e-02 1.77e-02 7.45e-03 4.29e-03 5.46e-02 5.67e-02 ph/cm2/s
Error 5.18e-03 2.66e-03 2.02e-03 2.13e-03 7.92e-03 8.30e-03 ph/cm2/s
Fluence Cutoff-PL 2.48e-07 3.61e-07 2.24e-07 4.98e-08 8.74e-07 8.83e-07 erg/cm2
Error 5.46e-08 6.55e-08 9.64e-08 1.37e-07 1.75e-07 2.25e-07 erg/cm2
Peak flux Cutoff-PL 2.50e-02 2.04e-02 6.65e-03 7.82e-04 5.28e-02 5.29e-02 ph/cm2/s
Error 5.73e-03 3.64e-03 2.63e-03 1.72e-03 7.96e-03 8.08e-03 ph/cm2/s
Fluence Band 2.46e-07 3.59e-07 2.24e-07 5.01e-08 8.73e-07 8.82e-07 erg/cm2
Error 5.18e-08 6.46e-08 -------- -------- 1.74e-07 -------- erg/cm2
Peak flux Band 2.50e-02 2.04e-02 6.65e-03 7.77e-04 5.28e-02 5.29e-02 ph/cm2/s
Error 5.47e-03 3.61e-03 -------- -------- 7.90e-03 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.248 0.281 - - 3.21e-04 6.65e-05 59.770 57
CPL 0.925 1.337 30.8 0.0 2.07e-03 0.00e+00 55.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.248 0.281 - - 3.21e-04 6.65e-05 59.770 57
CPL 0.925 1.337 30.8 0.0 2.07e-03 0.00e+00 55.780 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.3334 -33.5214 0.0263 12.8 -110.5 2.0720 7.3 TRIG_00635797
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24756 ( -0.267953 0.293714 )
Norm@50keV : 3.21328E-04 ( -6.7094e-05 6.59262e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.752675e-01
Photon flux (15-150 keV) in 320 sec: 5.45631E-02 ( -0.0079236 0.00792391 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.73718e-07 ( -1.6978e-07 1.76354e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.925469 ( -1.65421 1.02 )
Epeak [keV] : 30.7949 ( )
Norm@50keV : 2.07359E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9960 for 56 degrees of freedom
# Null hypothesis probability = 4.832905e-01
Photon flux (15-150 keV) in 320 sec: 5.27877E-02 ( -0.0079439 0.0079852 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.74288e-07 ( -1.64637e-07 1.85312e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.927309 ( -1.12805 0.876271 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 30.7822 ( -19.9438 10.977 )
Norm@50keV : 2.06800E-03 ( -0.002068 0.0218568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.454314e-01
Photon flux (15-150 keV) in 320 sec: 5.27758E-02 ( 6.94722 -0.0078518 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.73315e-07 ( -8.71075e-07 -1.64266e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.29922 (-1.27234 1.53414)
R^2/D10^2 : 5.26898E-02 (-0.026033 0.0504098)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.16 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.290840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.155e-07 5.379e-08
25- 50 4.016e-07 8.741e-08
50-150 1.188e-07 5.352e-08
15-150 7.360e-07 1.768e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.4080 (-13.0021 21.952)
Norm : 0.339207 (-0.0782116 0.109537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.05 using 59 PHA bins.
# Reduced chi-squared = 0.9833 for 57 degrees of freedom
# Null hypothesis probability = 5.107025e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.558e-07 4.854e-08
25- 50 3.482e-07 6.906e-08
50-150 2.939e-07 1.264e-07
15-150 8.979e-07 2.107e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.52764 (-2.10686 2.08028)
R1^2/D10^2 : 0.183228 (-0.122911 0.91207)
kT2 [keV] : 15.2286 (-11.7189 11.5619)
R2^2/D10^2 : 2.81892E-03 (-0.00268207 0.019229)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.76 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 55 degrees of freedom
# Null hypothesis probability = 4.836885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.532e-07 1.419e-07
25- 50 3.499e-07 1.829e-07
50-150 2.909e-07 1.870e-07
15-150 8.940e-07 4.614e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24756 ( -0.267953 0.293714 )
Norm@50keV : 3.21328E-04 ( -6.7094e-05 6.59262e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.752675e-01
Photon flux (15-150 keV) in 320 sec: 5.45631E-02 ( -0.0079236 0.00792391 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.73718e-07 ( -1.6978e-07 1.76354e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.925469 ( -1.65421 1.02 )
Epeak [keV] : 30.7949 ( )
Norm@50keV : 2.07359E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9960 for 56 degrees of freedom
# Null hypothesis probability = 4.832905e-01
Photon flux (15-150 keV) in 320 sec: 5.27877E-02 ( -0.0079439 0.0079852 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.74288e-07 ( -1.64637e-07 1.85312e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.927309 ( -1.12805 0.876271 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 30.7822 ( -19.7883 10.9796 )
Norm@50keV : 2.06800E-03 ( -0.002068 0.0218568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.454314e-01
Photon flux (15-150 keV) in 320 sec: 5.27758E-02 ( 6.94722 -0.0078518 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.73315e-07 ( -8.71075e-07 -1.64266e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.29922 (-1.27234 1.53414)
R^2/D10^2 : 5.26898E-02 (-0.026033 0.0504098)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.16 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.290840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.155e-07 5.090e-08
25- 50 4.016e-07 8.957e-08
50-150 1.188e-07 5.334e-08
15-150 7.360e-07 1.658e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.4080 (-13.0021 21.952)
Norm : 0.339207 (-0.0782116 0.109537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.05 using 59 PHA bins.
# Reduced chi-squared = 0.9833 for 57 degrees of freedom
# Null hypothesis probability = 5.107025e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.558e-07 5.189e-08
25- 50 3.482e-07 7.381e-08
50-150 2.939e-07 1.280e-07
15-150 8.979e-07 1.986e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.52764 (-2.10686 2.08028)
R1^2/D10^2 : 0.183228 (-0.122911 0.91207)
kT2 [keV] : 15.2286 (-11.7189 11.5619)
R2^2/D10^2 : 2.81892E-03 (-0.00268207 0.019229)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.76 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 55 degrees of freedom
# Null hypothesis probability = 4.836885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.532e-07 1.362e-07
25- 50 3.499e-07 1.822e-07
50-150 2.909e-07 1.706e-07
15-150 8.940e-07 4.576e-07
Plot creation:
Mon Mar 23 02:02:06 EDT 2015