batgrbproduct Analysis for Trigger=635788
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 00:28:17 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635788/GCN5_download_cron
======================================================================
Trigger: 00635788 Segment: 000
BAT Trigger Time: 448704616 [s; MET]
Trigger Stop: 448704680 [s; MET]
UTC: 2015-03-22T08:10:02.657280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.842739036753 Dec: 11.1865115623601 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.43
Flight Position: [ source = BAT ]
RA: 288.842739036753 Dec: 11.1865115623601 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.865781628186 Dec: 11.1893307192905 [deg; J2000]
{ 19h 15m 27.8s , +11d 11' 21.6" }
+/- 3.42888564217382 [arcmin] (estimated 90% radius based on SNR)
+/- 1.51973323512494 [arcmin] (formal 1-sigma fit error)
SNR: 5.23135380117766
Angular difference between Flight and Ground position is 1.366789 arcmin
Partial Coding Fraction: 0.375 [ 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 0.732801 0.338600 0.102764 -0.061509
0.108382 0.103758 0.080269 0.058250 [error]
Peak 0.732801 0.338600 0.102764 -0.061509
0.108382 0.103758 0.080269 0.058250 [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 2.22e-07 1.76e-07 9.39e-08 7.29e-08 5.25e-07 5.65e-07 erg/cm2
Error 5.54e-08 5.50e-08 5.89e-08 9.58e-08 1.55e-07 1.99e-07 erg/cm2
Peak flux Power-law 1.15e-01 5.13e-02 1.37e-02 4.52e-03 1.83e-01 1.85e-01 ph/cm2/s
Error 2.93e-02 1.53e-02 8.32e-03 5.62e-03 4.18e-02 4.26e-02 ph/cm2/s
Fluence Cutoff-PL 2.32e-07 1.84e-07 2.04e-08 1.17e-10 4.35e-07 4.37e-07 erg/cm2
Error 6.26e-08 8.17e-08 -------- 8.02e-08 1.69e-07 2.10e-07 erg/cm2
Peak flux Cutoff-PL 1.18e-01 5.55e-02 3.43e-03 1.11e-05 1.77e-01 1.77e-01 ph/cm2/s
Error 3.22e-02 2.25e-02 -------- 4.76e-03 4.20e-02 4.21e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- 1.79e-01 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 2.907 0.569 - - 7.12e-04 3.37e-04 48.740 57
CPL 1.000 0.000 50.0 0.0 3.35e-03 0.00e+00 62.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.907 0.569 - - 7.12e-04 3.37e-04 48.740 57
CPL 1.000 0.000 50.0 0.0 3.35e-03 0.00e+00 62.680 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
288.8658 +11.1893 0.0369 33.4 139.0 1.1044 5.2 TRIG_00635788
------------------------------------------
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: 2.90682 ( -0.501252 0.637173 )
Norm@50keV : 7.12157E-04 ( -0.000324611 0.000349153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.74 using 59 PHA bins.
# Reduced chi-squared = 0.8550 for 57 degrees of freedom
# Null hypothesis probability = 7.738131e-01
Photon flux (15-150 keV) in 64 sec: 0.183170 ( -0.0417461 0.0418139 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.25444e-07 ( -1.48361e-07 1.61352e-07 ) 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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.34938E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.68 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 56 degrees of freedom
# Null hypothesis probability = 2.514899e-01
Photon flux (15-150 keV) in 64 sec: 0.176885 ( -0.041201 0.042862 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.35483e-07 ( -1.2164e-07 2.15442e-07 ) 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 : 3.55811 ( -9.78699 -3.56284 )
beta : -3.76840 ( 3.7633 1.13226 )
Epeak [keV] : 20.5908 ( -20.5734 4.45866 )
Norm@50keV : 69.1344 ( -70.2821 320.029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.72 using 59 PHA bins.
# Reduced chi-squared = 0.8495 for 55 degrees of freedom
# Null hypothesis probability = 7.788365e-01
Photon flux (15-150 keV) in 64 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] : 5.28994 (-1.07375 1.3415)
R^2/D10^2 : 1.20729 (-0.772378 2.27018)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.88 using 59 PHA bins.
# Reduced chi-squared = 0.8400 for 57 degrees of freedom
# Null hypothesis probability = 7.998724e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.342e-07 1.173e-07
25- 50 1.753e-07 1.053e-07
50-150 9.299e-09 8.554e-09
15-150 4.188e-07 2.334e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5466 (-7.15856 13.3271)
Norm : 2.45084 (-1.11725 2.29427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.92 using 59 PHA bins.
# Reduced chi-squared = 0.8407 for 57 degrees of freedom
# Null hypothesis probability = 7.986724e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.276e-07 8.541e-08
25- 50 1.876e-07 9.100e-08
50-150 4.936e-08 4.076e-08
15-150 4.646e-07 1.954e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.86952 (-4.89428 1.4025)
R1^2/D10^2 : 1.64302 (-1.63912 4.15589)
kT2 [keV] : 20.7611 (-21.7927 -21.7927)
R2^2/D10^2 : 1.18551E-03 (-0.00114364 2.47415)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8449 for 55 degrees of freedom
# Null hypothesis probability = 7.868155e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.360e-07 1.319e-07
25- 50 1.722e-07 1.021e-07
50-150 1.067e-07 6.806e-08
15-150 5.149e-07 2.795e-07
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: 2.90682 ( -0.501252 0.637173 )
Norm@50keV : 7.12157E-04 ( -0.000324611 0.000349153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.74 using 59 PHA bins.
# Reduced chi-squared = 0.8550 for 57 degrees of freedom
# Null hypothesis probability = 7.738131e-01
Photon flux (15-150 keV) in 64 sec: 0.183170 ( -0.0417461 0.0418139 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.25444e-07 ( -1.48361e-07 1.61352e-07 ) 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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.34938E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.68 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 56 degrees of freedom
# Null hypothesis probability = 2.514899e-01
Photon flux (15-150 keV) in 64 sec: 0.176885 ( -0.041201 0.042862 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.35483e-07 ( -1.2164e-07 2.15455e-07 ) 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 : 3.55811 ( -9.72407 -3.56284 )
beta : -3.76840 ( 3.7633 1.13226 )
Epeak [keV] : 20.5908 ( -20.5734 4.45866 )
Norm@50keV : 69.1344 ( -70.2821 320.029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.72 using 59 PHA bins.
# Reduced chi-squared = 0.8495 for 55 degrees of freedom
# Null hypothesis probability = 7.788365e-01
Photon flux (15-150 keV) in 64 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] : 5.28994 (-1.07375 1.3415)
R^2/D10^2 : 1.20729 (-0.772378 2.27018)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.88 using 59 PHA bins.
# Reduced chi-squared = 0.8400 for 57 degrees of freedom
# Null hypothesis probability = 7.998724e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.342e-07 1.307e-07
25- 50 1.753e-07 1.107e-07
50-150 9.299e-09 7.715e-09
15-150 4.188e-07 2.311e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5466 (-7.15856 13.3271)
Norm : 2.45084 (-1.11725 2.29427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.92 using 59 PHA bins.
# Reduced chi-squared = 0.8407 for 57 degrees of freedom
# Null hypothesis probability = 7.986724e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.276e-07 8.288e-08
25- 50 1.876e-07 8.796e-08
50-150 4.936e-08 3.960e-08
15-150 4.646e-07 2.116e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.86952 (-4.89428 1.4025)
R1^2/D10^2 : 1.64302 (-1.63912 4.15589)
kT2 [keV] : 20.7611 (-21.7927 -21.7927)
R2^2/D10^2 : 1.18551E-03 (-0.00114364 2.47415)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8449 for 55 degrees of freedom
# Null hypothesis probability = 7.868155e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.360e-07 1.337e-07
25- 50 1.722e-07 1.013e-07
50-150 1.067e-07 1.025e-07
15-150 5.149e-07 2.920e-07
Plot creation:
Mon Mar 23 00:31:10 EDT 2015