batgrbproduct Analysis for Trigger=639275
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 Apr 29 07:50:25 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger639275/GCN5_download_cron
======================================================================
Trigger: 00639275 Segment: 000
BAT Trigger Time: 451877454.336 [s; MET]
Trigger Stop: 451877466.496 [s; MET]
UTC: 2015-04-28T01:30:40.830840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.542964551214 Dec: 6.98089967772161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.63
Image Trigger?: NO
Rate S/N Ratio: 29.8328677803526 [ if not an image trigger ]
Image S/N Ratio: 12.63
Flight Position: [ source = BAT ]
RA: 188.542964551214 Dec: 6.98089967772161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 188.538581004056 Dec: 6.96682379665693 [deg; J2000]
{ 12h 34m 09.3s , +06d 58' 00.6" }
+/- 1.15625065557435 [arcmin] (estimated 90% radius based on SNR)
+/- 0.478214383055671 [arcmin] (formal 1-sigma fit error)
SNR: 24.7197517909655
Angular difference between Flight and Ground position is 0.883983 arcmin
Partial Coding Fraction: 0.1699219 [ including projection effects ]
Duration
T90: 53.216000020504 +/- 15.1044342686163
Measured from: -20.4719998836517
to: 32.7440001368523 [s; relative to TRIGTIME]
T50: 21.6320000886917 +/- 1.82575360962042
Measured from: 2.12000006437302
to: 23.7520001530647 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.3879999518394
to: 18.3879999518394 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.9840000271797
to: 38.5999999642372 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.865839 3.026141 2.911636 0.985602
0.145122 0.149590 0.134852 0.110953 [error]
Peak 0.070763 0.122789 0.129074 0.037946
0.017485 0.019919 0.018400 0.015658 [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 6.63e-07 1.39e-06 2.29e-06 8.51e-06 6.31e-06 1.28e-05 erg/cm2
Error 7.01e-08 8.68e-08 1.31e-07 1.12e-06 3.33e-07 1.18e-06 erg/cm2
Peak flux Power-law 9.08e-01 9.79e-01 7.51e-01 9.42e-01 2.99e+00 3.58e+00 ph/cm2/s
Error 2.69e-01 1.80e-01 1.43e-01 3.70e-01 5.05e-01 5.87e-01 ph/cm2/s
Fluence Cutoff-PL 6.53e-07 1.40e-06 2.31e-06 7.89e-06 6.30e-06 1.22e-05 erg/cm2
Error 8.55e-08 6.83e-08 1.50e-07 2.16e-06 3.43e-07 2.18e-06 erg/cm2
Peak flux Cutoff-PL 8.69e-01 9.98e-01 7.71e-01 7.52e-01 2.97e+00 3.39e+00 ph/cm2/s
Error 3.14e-01 2.04e-01 -------- 6.62e-01 5.16e-01 7.54e-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 1.283 0.092 - - 8.20e-03 4.18e-04 57.750 57
CPL 1.209 0.233 582.9 0.0 8.83e-03 2.17e-03 57.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.383 0.275 - - 2.47e-02 4.00e-03 75.180 57
CPL 1.172 1.469 211.2 0.0 3.12e-02 5.13e-02 75.070 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: 34.432000 sec.
T50 in the 50-300 keV band: 18.560000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 77.584 -38.984 38.600
T90 53.216 -20.472 32.744
T50 21.632 2.120 23.752
Peak 1.000 17.388 18.388
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
188.5386 +6.9668 0.0078 43.7 36.8 9.4360 24.7 TRIG_00639275
------------------------------------------
Foreground time interval of the image:
-38.984 38.600 (delta_t = 77.584 [sec])
Background time interval of the image:
-239.336 -154.966 (delta_t = 84.370 [sec])
-154.336 -38.984 (delta_t = 115.352 [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 -38.984 sec. to 38.600 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28266 ( -0.0921874 0.0913803 )
Norm@50keV : 8.20196E-03 ( -0.000418851 0.00041798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.75 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.474162e-01
Photon flux (15-150 keV) in 77.58 sec: 0.975459 ( -0.054259 0.0545544 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.3149e-06 ( -3.32861e-07 3.33476e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.984 sec. to 38.600 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20901 ( -0.365187 0.100227 )
Epeak [keV] : 582.912 ( -982.452 -982.452 )
Norm@50keV : 8.83490E-03 ( -0.00070893 0.00362592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.093180e-01
Photon flux (15-150 keV) in 77.58 sec: 0.968308 ( -0.049505 0.047682 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30363e-06 ( -3.41414e-07 3.44052e-07 ) ergs/cm2
Band function
Time interval is from -38.984 sec. to 38.600 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.99230 ( 8.9923 8.9923 )
beta : -1.28266 ( -0.0913795 0.0921872 )
Epeak [keV] : 82.3081 ( -82.3081 -82.3081 )
Norm@50keV : 1.11476 ( -0.0569279 0.0568094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.75 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.740497e-01
Photon flux (15-150 keV) in 77.58 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] : 20.1597 ( )
R^2/D10^2 : 4.19794E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 145.42 using 59 PHA bins.
# Reduced chi-squared = 2.5513 for 57 degrees of freedom
# Null hypothesis probability = 1.143618e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.543e-07 2.797e-08
25- 50 1.274e-06 1.098e-07
50-150 3.841e-06 2.960e-07
15-150 5.369e-06 3.247e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.15981 (-0.213036 0.212947)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.65 using 59 PHA bins.
# Reduced chi-squared = 1.555 for 57 degrees of freedom
# Null hypothesis probability = 4.595049e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.039e-07 4.461e-08
25- 50 1.546e-06 8.883e-08
50-150 3.392e-06 2.289e-07
15-150 5.742e-06 3.782e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.73855 (-1.45767 1.70273)
R1^2/D10^2 : 0.629041 (-0.296125 0.674353)
kT2 [keV] : 32.3393 (-4.89766 8.23478)
R2^2/D10^2 : 7.46163E-03 (-0.00385126 0.00561892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.18 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.936797e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.053e-07 1.459e-07
25- 50 1.424e-06 2.649e-07
50-150 4.302e-06 9.919e-07
15-150 6.331e-06 1.022e-06
Peak spectrum fit
Power-law model
Time interval is from 17.388 sec. to 18.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38261 ( -0.275655 0.275166 )
Norm@50keV : 2.46796E-02 ( -0.00400255 0.00399362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.18 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 57 degrees of freedom
# Null hypothesis probability = 5.365746e-02
Photon flux (15-150 keV) in 1 sec: 2.99387 ( -0.504554 0.506251 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39333e-07 ( -4.17768e-08 4.20391e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.388 sec. to 18.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17238 ( -1.27978 1.65889 )
Epeak [keV] : 211.173 ( -211.173 -211.173 )
Norm@50keV : 3.11935E-02 ( -0.0103017 0.0923119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.07 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 56 degrees of freedom
# Null hypothesis probability = 4.532204e-02
Photon flux (15-150 keV) in 1 sec: 2.97336 ( -0.51566 0.51607 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37302e-07 ( -4.4071e-08 4.3311e-08 ) ergs/cm2
Band function
Time interval is from 17.388 sec. to 18.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.313368 ( 0.725665 0.725665 )
beta : -1.48893 ( 1.46038 0.33801 )
Epeak [keV] : 56.2726 ( -55.2308 214.325 )
Norm@50keV : 0.110976 ( -0.116019 2.3394e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.900114e-02
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] : 17.3002 (-3.25531 4.06504)
R^2/D10^2 : 0.217011 (-0.112432 0.227303)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.75 using 59 PHA bins.
# Reduced chi-squared = 1.469 for 57 degrees of freedom
# Null hypothesis probability = 1.206512e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.316e-08 4.702e-09
25- 50 5.905e-08 1.656e-08
50-150 1.269e-07 3.934e-08
15-150 1.991e-07 5.190e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.4882 (-2.02926 2.02906)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.33 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 57 degrees of freedom
# Null hypothesis probability = 4.463700e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.111e-08 1.815e-08
25- 50 5.984e-08 3.368e-08
50-150 1.312e-07 7.485e-08
15-150 2.222e-07 1.267e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.98814 (-3.82395 6.11828)
R1^2/D10^2 : 1.89901 (-1.50673 16.1584)
kT2 [keV] : 30.5941 (-11.6944 -30.726)
R2^2/D10^2 : 2.40223E-02 (-0.0234133 0.114967)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.17 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 55 degrees of freedom
# Null hypothesis probability = 3.670529e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.536e-08 1.477e-08
25- 50 5.982e-08 3.220e-08
50-150 1.517e-07 8.805e-08
15-150 2.369e-07 1.206e-07
Plot creation:
Wed Apr 29 07:54:07 EDT 2015