batgrbproduct Analysis for Trigger=632159
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 Feb 23 17:15:45 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger632159/GCN5_download_cron
======================================================================
Trigger: 00632159 Segment: 000
BAT Trigger Time: 446301084.572 [s; MET]
Trigger Stop: 446301084.58 [s; MET]
UTC: 2015-02-22T12:31:11.351580 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.723658080581 Dec: 21.8916627473002 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.47
Image Trigger?: NO
Rate S/N Ratio: 169.192198401699 [ if not an image trigger ]
Image S/N Ratio: 16.47
Flight Position: [ source = BAT ]
RA: 293.723658080581 Dec: 21.8916627473002 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.721598377964 Dec: 21.8886267769705 [deg; J2000]
{ 19h 34m 53.2s , +21d 53' 19.1" }
+/- 1.16458571590581 [arcmin] (estimated 90% radius based on SNR)
+/- 0.431524818401001 [arcmin] (formal 1-sigma fit error)
SNR: 24.4673944928748
Angular difference between Flight and Ground position is 0.215247 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.0159999132156372 +/- 0.00400000810623169
Measured from: -0.00399988889694214
to: 0.0120000243186951 [s; relative to TRIGTIME]
T50: 0.00399994850158691 +/- 0.004
Measured from: 1.19209289550781e-07
to: 0.00400006771087646 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.492000043392181
to: 0.507999956607819 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.015999972820282 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.057803 0.046854 0.011147 -0.000361
0.003377 0.003073 0.001597 0.000630 [error]
Peak 0.058138 0.041782 0.007603 -0.001092
0.006441 0.006315 0.004881 0.003875 [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 1.78e-08 1.47e-08 8.24e-09 6.83e-09 4.37e-08 4.75e-08 erg/cm2
Error 1.71e-09 1.23e-09 1.16e-09 1.70e-09 3.63e-09 4.29e-09 erg/cm2
Peak flux Power-law 4.98e-01 2.85e-01 1.03e-01 4.89e-02 9.12e-01 9.34e-01 ph/cm2/s
Error 9.09e-02 4.96e-02 3.34e-02 2.80e-02 1.43e-01 1.48e-01 ph/cm2/s
Fluence Cutoff-PL 1.57e-08 1.92e-08 7.96e-09 7.98e-10 4.36e-08 4.37e-08 erg/cm2
Error 1.94e-09 1.91e-09 1.58e-09 6.54e-10 3.58e-09 3.62e-09 erg/cm2
Peak flux Cutoff-PL 4.81e-01 3.52e-01 5.95e-02 1.36e-03 8.94e-01 8.94e-01 ph/cm2/s
Error 9.92e-02 7.00e-02 4.57e-02 8.81e-03 1.39e-01 1.39e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.81e-01 3.52e-01 6.10e-02 -------- 8.94e-01 8.96e-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 2.833 0.133 - - 1.95e-01 2.14e-02 74.870 57
CPL 0.817 0.736 23.7 6.9 3.14e+00 4.10e+00 43.520 56
The chi2 of BB fit is 63.19 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 2.469 0.306 - - 4.73e-03 1.19e-03 55.550 57
CPL 0.181 2.214 25.6 11.4 1.61e-01 8.01e+00 49.190 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.020 -0.004 0.016
T90 0.016 -0.004 0.012
T50 0.004 0.000 0.004
Peak 1.000 -0.492 0.508
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7216 +21.8886 0.0079 0.0 -97.2 0.1184 24.5 TRIG_00632159
------------------------------------------
Foreground time interval of the image:
-0.004 0.016 (delta_t = 0.020 [sec])
Background time interval of the image:
-119.572 -0.004 (delta_t = 119.568 [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 -0.004 sec. to 0.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.83319 ( -0.128502 0.137133 )
Norm@50keV : 0.195399 ( -0.0215402 0.0212504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.87 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 57 degrees of freedom
# Null hypothesis probability = 5.634706e-02
Photon flux (15-150 keV) in 0.02 sec: 47.7306 ( -3.91497 3.91719 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37032e-08 ( -3.62814e-09 3.63302e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.816671 ( -0.789234 0.682845 )
Epeak [keV] : 23.6909 ( -8.68089 5.06721 )
Norm@50keV : 3.13718 ( -1.90376 6.29827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.52 using 59 PHA bins.
# Reduced chi-squared = 0.7772 for 56 degrees of freedom
# Null hypothesis probability = 8.879603e-01
Photon flux (15-150 keV) in 0.02 sec: 47.2869 ( -3.952 3.9548 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36474e-08 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.816563 ( -0.579008 0.894037 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 23.6852 ( -4.41242 5.06276 )
Norm@50keV : 3.13792 ( -1.90442 6.30502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.52 using 59 PHA bins.
# Reduced chi-squared = 0.7913 for 55 degrees of freedom
# Null hypothesis probability = 8.678750e-01
Photon flux (15-150 keV) in 0.02 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] : 7.91562 (-0.610107 0.629392)
R^2/D10^2 : 56.1148 (-15.8824 23.0363)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.668616e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.261e-08 1.432e-09
25- 50 2.167e-08 2.062e-09
50-150 5.495e-09 1.280e-09
15-150 3.978e-08 3.500e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.3444 (-3.38945 3.79963)
Norm : 418.210 (-58.6598 68.6737)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.19 using 59 PHA bins.
# Reduced chi-squared = 0.7928 for 57 degrees of freedom
# Null hypothesis probability = 8.706918e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.652e-08 1.582e-09
25- 50 1.828e-08 1.522e-09
50-150 9.279e-09 2.085e-09
15-150 4.407e-08 3.590e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.12787 (-1.13165 1.3124)
R1^2/D10^2 : 498.763 (-326.108 1082.46)
kT2 [keV] : 10.4588 (-1.39247 2.07401)
R2^2/D10^2 : 12.2601 (-8.07958 14.2766)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.09 using 59 PHA bins.
# Reduced chi-squared = 0.7653 for 55 degrees of freedom
# Null hypothesis probability = 8.994153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.608e-08 7.285e-09
25- 50 1.881e-08 8.164e-09
50-150 8.756e-09 4.293e-09
15-150 4.365e-08 1.872e-08
Peak spectrum fit
Power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46861 ( -0.287718 0.32407 )
Norm@50keV : 4.73006E-03 ( -0.00118906 0.00119686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.55 using 59 PHA bins.
# Reduced chi-squared = 0.9746 for 57 degrees of freedom
# Null hypothesis probability = 5.295757e-01
Photon flux (15-150 keV) in 1 sec: 0.911615 ( -0.142509 0.14262 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69078e-08 ( -9.06192e-09 9.49367e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.181347 ( -2.73401 1.69351 )
Epeak [keV] : 25.6246 ( -16.7476 6.024 )
Norm@50keV : 0.161472 ( -0.194765 15.8301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
# Reduced chi-squared = 0.8784 for 56 degrees of freedom
# Null hypothesis probability = 7.284126e-01
Photon flux (15-150 keV) in 1 sec: 0.894184 ( -0.13838 0.139196 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01104e-08 ( -7.6231e-09 8.9047e-09 ) ergs/cm2
Band function
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.32093 ( -1.68823 2.59262 )
beta : -3.13845 ( 9.37167 19.369 )
Epeak [keV] : 23.1916 ( -11.8358 6.00715 )
Norm@50keV : 641.892 ( -641.248 194.02 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.42 using 59 PHA bins.
# Reduced chi-squared = 0.8623 for 55 degrees of freedom
# Null hypothesis probability = 7.561609e-01
Photon flux (15-150 keV) in 1 sec: 0.894199 ( ) 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] : 6.92212 (-1.0222 1.18169)
R^2/D10^2 : 1.91494 (-0.921309 1.80406)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.8890 for 57 degrees of freedom
# Null hypothesis probability = 7.097968e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.457e-08 3.361e-09
25- 50 1.952e-08 5.015e-09
50-150 3.106e-09 1.550e-09
15-150 3.720e-08 9.500e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.3216 (-8.57279 13.2254)
Norm : 7.46955 (-1.98469 2.8445)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.44 using 59 PHA bins.
# Reduced chi-squared = 0.8849 for 57 degrees of freedom
# Null hypothesis probability = 7.178504e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.529e-08 2.885e-09
25- 50 1.757e-08 4.525e-09
50-150 9.756e-09 5.303e-09
15-150 4.261e-08 1.015e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.21883 (-5.23533 -5.23533)
R1^2/D10^2 : 4.25576 (-4.13892 -4.13892)
kT2 [keV] : 11.5311 (-11.7163 -11.7163)
R2^2/D10^2 : 0.111629 (-0.101274 2.33298)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8787 for 55 degrees of freedom
# Null hypothesis probability = 7.255063e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.537e-08 9.045e-09
25- 50 1.826e-08 9.975e-09
50-150 7.736e-09 4.362e-09
15-150 4.136e-08 2.131e-08
Plot creation:
Mon Feb 23 17:17:54 EST 2015