batgrbproduct Analysis for Trigger=635148
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): Wed Mar 18 02:56:47 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635148/GCN5_download_cron
======================================================================
Trigger: 00635148 Segment: 000
BAT Trigger Time: 448258975.296 [s; MET]
Trigger Stop: 448258975.808 [s; MET]
UTC: 2015-03-17T04:22:41.976060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 138.935547486144 Dec: 55.4522389164227 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.73
Image Trigger?: NO
Rate S/N Ratio: 13.0384048104053 [ if not an image trigger ]
Image S/N Ratio: 8.73
Flight Position: [ source = BAT ]
RA: 138.935547486144 Dec: 55.4522389164227 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 138.993241134332 Dec: 55.4734822573279 [deg; J2000]
{ 09h 15m 58.4s , +55d 28' 24.5" }
+/- 1.70285655519348 [arcmin] (estimated 90% radius based on SNR)
+/- 0.672785008124507 [arcmin] (formal 1-sigma fit error)
SNR: 14.2188345459289
Angular difference between Flight and Ground position is 2.340114 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 23.2799999713898 +/- 0.859069244646924
Measured from: -0.0319998860359192
to: 23.2480000853539 [s; relative to TRIGTIME]
T50: 14.2639999389648 +/- 3.4957305454896
Measured from: 1.84400010108948
to: 16.1080000400543 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.148000001907349
to: 0.851999998092651 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.435999989509583
to: 24 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.323641 0.378626 0.285697 0.076714
0.029923 0.031001 0.026698 0.022166 [error]
Peak 0.032898 0.053055 0.055828 0.006009
0.006458 0.007105 0.006322 0.004986 [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 8.87e-08 1.61e-07 2.25e-07 6.58e-07 6.46e-07 1.13e-06 erg/cm2
Error 1.31e-08 1.42e-08 2.67e-08 1.71e-07 6.34e-08 1.91e-07 erg/cm2
Peak flux Power-law 3.07e-01 3.71e-01 3.23e-01 4.84e-01 1.17e+00 1.48e+00 ph/cm2/s
Error 7.64e-02 5.61e-02 5.00e-02 1.56e-01 1.58e-01 2.11e-01 ph/cm2/s
Fluence Cutoff-PL 8.90e-08 1.61e-07 2.23e-07 6.49e-07 6.42e-07 1.08e-06 erg/cm2
Error 1.30e-08 1.42e-08 2.67e-08 1.76e-07 6.28e-08 2.49e-07 erg/cm2
Peak flux Cutoff-PL 2.71e-01 3.87e-01 3.44e-01 2.76e-01 1.15e+00 1.28e+00 ph/cm2/s
Error 8.99e-02 6.37e-02 5.94e-02 2.57e-01 1.62e-01 2.88e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.85e-01 3.82e-01 3.37e-01 3.36e-01 1.16e+00 1.34e+00 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 1.518 0.159 - - 2.80e-03 2.46e-04 50.560 57
CPL 2.348 0.159 122.2 0.0 1.07e-03 0.00e+00 50.470 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.197 0.224 - - 9.98e-03 1.32e-03 64.290 57
CPL 0.631 0.820 131.0 0.0 1.85e-02 0.00e+00 62.850 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: 23.040000 sec.
T50 in the 50-300 keV band: 16.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.436 -0.436 24.000
T90 23.280 -0.032 23.248
T50 14.264 1.844 16.108
Peak 1.000 -0.148 0.852
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
138.9932 +55.4735 0.0135 17.2 66.5 0.5405 14.2 TRIG_00635148
------------------------------------------
Foreground time interval of the image:
-0.436 9.205 (delta_t = 9.641 [sec])
Background time interval of the image:
-239.296 -198.146 (delta_t = 41.150 [sec])
-197.296 -134.596 (delta_t = 62.700 [sec])
-133.296 -127.606 (delta_t = 5.690 [sec])
-126.296 -75.476 (delta_t = 50.820 [sec])
-74.296 -55.426 (delta_t = 18.870 [sec])
-52.296 -0.436 (delta_t = 51.860 [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 -0.436 sec. to 24.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51768 ( -0.15783 0.159407 )
Norm@50keV : 2.79606E-03 ( -0.000247063 0.000244994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.56 using 59 PHA bins.
# Reduced chi-squared = 0.8869 for 57 degrees of freedom
# Null hypothesis probability = 7.139205e-01
Photon flux (15-150 keV) in 24.44 sec: 0.350744 ( -0.0300729 0.0301321 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.46433e-07 ( -6.30733e-08 6.37109e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.436 sec. to 24.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.34794 ( -0.16319 0.155791 )
Epeak [keV] : 122.174 ( -9999.36 -9999.36 )
Norm@50keV : 1.06965E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.47 using 59 PHA bins.
# Reduced chi-squared = 0.9013 for 56 degrees of freedom
# Null hypothesis probability = 6.833796e-01
Photon flux (15-150 keV) in 24.44 sec: 0.351173 ( -0.03054 0.029674 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.42295e-07 ( -5.9289e-08 6.62226e-08 ) ergs/cm2
Band function
Time interval is from -0.436 sec. to 24.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23999 ( 1.23999 1.23999 )
beta : -1.51765 ( 1.51765 0.157847 )
Epeak [keV] : 26.8829 ( -26.8829 -26.8829 )
Norm@50keV : 5.79938E-03 ( -0.00324339 9.39912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.56 using 59 PHA bins.
# Reduced chi-squared = 0.9192 for 55 degrees of freedom
# Null hypothesis probability = 6.449453e-01
Photon flux (15-150 keV) in 24.44 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] : 14.4421 (-1.84942 2.19081)
R^2/D10^2 : 4.33083E-02 (-0.0167861 0.0269771)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.63 using 59 PHA bins.
# Reduced chi-squared = 1.8005 for 57 degrees of freedom
# Null hypothesis probability = 2.009335e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.648e-08 8.077e-09
25- 50 1.782e-07 2.219e-08
50-150 2.485e-07 4.921e-08
15-150 4.732e-07 5.560e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.42174 (-0.120242 0.120243)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.34 using 59 PHA bins.
# Reduced chi-squared = 0.9358 for 57 degrees of freedom
# Null hypothesis probability = 6.132299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.675e-08 9.446e-09
25- 50 1.669e-07 4.567e-08
50-150 3.660e-07 1.546e-07
15-150 6.197e-07 1.815e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.68740 (-1.43185 1.69474)
R1^2/D10^2 : 0.490887 (-0.264746 0.703646)
kT2 [keV] : 32.8136 (-8.60827 20.7142)
R2^2/D10^2 : 2.24143E-03 (-0.00165543 0.00359818)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.33 using 59 PHA bins.
# Reduced chi-squared = 0.9150 for 55 degrees of freedom
# Null hypothesis probability = 6.535578e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.072e-08 2.673e-08
25- 50 1.583e-07 4.838e-08
50-150 4.212e-07 2.081e-07
15-150 6.702e-07 2.443e-07
Peak spectrum fit
Power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19657 ( -0.225349 0.22243 )
Norm@50keV : 9.98100E-03 ( -0.00132139 0.00132078 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.29 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.366279e-01
Photon flux (15-150 keV) in 1 sec: 1.17100 ( -0.157655 0.157886 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0136e-07 ( -1.49832e-08 1.51434e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.631025 ( -0.970557 0.670289 )
Epeak [keV] : 131.038 ( )
Norm@50keV : 1.84912E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.465593e-01
Photon flux (15-150 keV) in 1 sec: 1.14660 ( -0.161977 0.16177 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82943e-08 ( -1.58499e-08 1.59007e-08 ) ergs/cm2
Band function
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.667906 ( -0.50323 0.650155 )
beta : -9.37165 ( 9.36961 19.3696 )
Epeak [keV] : 137.807 ( -59.9238 -137.803 )
Norm@50keV : 1.76753E-02 ( -0.00669486 0.011919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.178563e-01
Photon flux (15-150 keV) in 1 sec: 1.15849 ( ) 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] : 19.5145 (-3.22545 3.95414)
R^2/D10^2 : 5.92414E-02 (-0.0267009 0.0478528)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.04 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.660285e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.391e-09 1.213e-09
25- 50 2.151e-08 4.960e-09
50-150 6.050e-08 1.589e-08
15-150 8.641e-08 1.811e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.80437 (-0.647891 0.64785)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.09 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.142446e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.196e-08 6.730e-09
25- 50 2.301e-08 1.280e-08
50-150 5.047e-08 2.836e-08
15-150 8.545e-08 4.727e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.70954 (-2.27423 3.34667)
R1^2/D10^2 : 1.03315 (-0.767461 3.61949)
kT2 [keV] : 27.1721 (-6.12548 12.2013)
R2^2/D10^2 : 1.73998E-02 (-0.0123065 0.0246869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Null hypothesis probability = 2.803122e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.267e-09 5.235e-09
25- 50 2.158e-08 1.133e-08
50-150 6.908e-08 3.848e-08
15-150 9.993e-08 5.245e-08
Plot creation:
Wed Mar 18 02:59:53 EDT 2015