batgrbproduct Analysis for Trigger=629547
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): Tue Feb 3 13:25:58 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger629547/batgroup_hand_proc
======================================================================
Trigger: 00629547 Segment: 000
BAT Trigger Time: 444611415.488 [s; MET]
Trigger Stop: 444611417.536 [s; MET]
UTC: 2015-02-02T23:10:02.353060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.2357037817736 Dec: -33.1499202499856 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.85
Image Trigger?: NO
Rate S/N Ratio: 18.6815416922694 [ if not an image trigger ]
Image S/N Ratio: 10.85
Flight Position: [ source = BAT ]
RA: 39.2357037817736 Dec: -33.1499202499856 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 39.2607483601411 Dec: -33.1322485326525 [deg; J2000]
{ 02h 37m 02.6s , -33d 07' 56.1" }
+/- 1.72588653259192 [arcmin] (estimated 90% radius based on SNR)
+/- 0.878179605980338 [arcmin] (formal 1-sigma fit error)
SNR: 13.9485629219468
Angular difference between Flight and Ground position is 1.645413 arcmin
Partial Coding Fraction: 0.6015625 [ including projection effects ]
Duration
T90: 25.6959999799728 +/- 4.29614150930232
Measured from: -0.887999951839447
to: 24.8080000281334 [s; relative to TRIGTIME]
T50: 16.1920000314713 +/- 1.37283358264541
Measured from: 1.36800003051758
to: 17.5600000619888 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.404000043869
to: 18.404000043869 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.65599995851517
to: 27.0640000104904 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.321275 0.321948 0.298896 0.107705
0.034559 0.034477 0.030766 0.026331 [error]
Peak 0.032287 0.041875 0.040849 0.012945
0.006756 0.006745 0.006262 0.005143 [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 8.27e-08 1.52e-07 2.14e-07 6.32e-07 6.12e-07 1.08e-06 erg/cm2
Error 1.49e-08 1.62e-08 3.06e-08 1.99e-07 7.28e-08 2.22e-07 erg/cm2
Peak flux Power-law 2.66e-01 3.16e-01 2.71e-01 3.96e-01 9.93e-01 1.25e+00 ph/cm2/s
Error 8.29e-02 5.85e-02 4.97e-02 1.61e-01 1.59e-01 2.06e-01 ph/cm2/s
Fluence Cutoff-PL 8.28e-08 1.52e-07 2.12e-07 6.25e-07 6.08e-07 1.03e-06 erg/cm2
Error 1.48e-08 1.60e-08 2.99e-08 2.06e-07 7.22e-08 2.84e-07 erg/cm2
Peak flux Cutoff-PL 2.70e-01 3.18e-01 2.70e-01 3.86e-01 9.95e-01 1.25e+00 ph/cm2/s
Error 8.52e-02 5.88e-02 5.06e-02 2.04e-01 1.20e-01 2.35e-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 1.505 0.192 - - 2.25e-03 2.39e-04 39.540 57
CPL 1.501 0.193 9999.4 0.0 2.25e-03 1.10e-03 39.550 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.221 0.291 - - 8.43e-03 1.31e-03 45.810 57
CPL 1.224 0.293 9999.3 0.0 8.45e-03 5.97e-03 45.820 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: 21.952000 sec.
T50 in the 50-300 keV band: 15.872000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.720 -1.656 27.064
T90 25.696 -0.888 24.808
T50 16.192 1.368 17.560
Peak 1.000 17.404 18.404
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
39.2607 -33.1322 0.0137 22.7452 80.1381 1.0843054 13.949 TRIG_00629547
Foreground time interval of the image:
-1.656 27.064 (delta_t = 28.720 [sec])
Background time interval of the image:
-60.488 -1.656 (delta_t = 58.832 [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 -1.656 sec. to 27.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50476 ( -0.190892 0.192807 )
Norm@50keV : 2.24679E-03 ( -0.000240506 0.000238101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.54 using 59 PHA bins.
# Reduced chi-squared = 0.6937 for 57 degrees of freedom
# Null hypothesis probability = 9.621130e-01
Photon flux (15-150 keV) in 28.72 sec: 0.280848 ( -0.0291618 0.0292246 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1167e-07 ( -7.2371e-08 7.32147e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.656 sec. to 27.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50144 ( -0.19116 0.195119 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.25367E-03 ( -0.000850336 0.0013552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.7063 for 56 degrees of freedom
# Null hypothesis probability = 9.529581e-01
Photon flux (15-150 keV) in 28.72 sec: 0.281225 ( -0.029609 0.028811 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.07727e-07 ( -6.87729e-08 7.56715e-08 ) ergs/cm2
Band function
Time interval is from -1.656 sec. to 27.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96598 ( -4.96598 -4.96598 )
beta : -1.52985 ( -0.209467 0.199481 )
Epeak [keV] : 19.9775 ( -19.9775 5.76552 )
Norm@50keV : 910.079 ( -92.639 1.21722e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.27 using 59 PHA bins.
# Reduced chi-squared = 0.7140 for 55 degrees of freedom
# Null hypothesis probability = 9.460337e-01
Photon flux (15-150 keV) in 28.72 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] : 15.7907 (-2.27828 2.71603)
R^2/D10^2 : 2.56550E-02 (-0.0107032 0.0183571)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.87 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.636545e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.810e-08 7.194e-09
25- 50 1.585e-07 2.476e-08
50-150 2.748e-07 5.455e-08
15-150 4.714e-07 7.051e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.14281 (-0.116865 0.11686)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.59 using 59 PHA bins.
# Reduced chi-squared = 0.7296 for 57 degrees of freedom
# Null hypothesis probability = 9.375990e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.174e-08 3.317e-08
25- 50 1.572e-07 8.480e-08
50-150 3.448e-07 1.878e-07
15-150 5.838e-07 2.548e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.03531 (-1.14289 1.60231)
R1^2/D10^2 : 1.10648 (-0.734844 2.30427)
kT2 [keV] : 25.5109 (-5.22667 9.27481)
R2^2/D10^2 : 4.35457E-03 (-0.00275139 0.0051816)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.81 using 59 PHA bins.
# Reduced chi-squared = 0.6875 for 55 degrees of freedom
# Null hypothesis probability = 9.628183e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.347e-08 4.386e-08
25- 50 1.330e-07 4.108e-08
50-150 3.879e-07 1.449e-07
15-150 6.143e-07 1.978e-07
Peak spectrum fit
Power-law model
Time interval is from 17.404 sec. to 18.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22082 ( -0.294313 0.287219 )
Norm@50keV : 8.43303E-03 ( -0.00130525 0.00130523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.81 using 59 PHA bins.
# Reduced chi-squared = 0.8036 for 57 degrees of freedom
# Null hypothesis probability = 8.560297e-01
Photon flux (15-150 keV) in 1 sec: 0.992866 ( -0.158959 0.159382 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50623e-08 ( -1.47182e-08 1.48827e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.404 sec. to 18.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22441 ( -0.3037 0.281937 )
Epeak [keV] : 9999.32 ( -9999.36 -9999.36 )
Norm@50keV : 8.44969E-03 ( -0.00131072 0.0106359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.82 using 59 PHA bins.
# Reduced chi-squared = 0.8182 for 56 degrees of freedom
# Null hypothesis probability = 8.323713e-01
Photon flux (15-150 keV) in 1 sec: 0.994610 ( -0.08347 0.15752 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45018e-08 ( -1.41937e-08 1.52925e-08 ) ergs/cm2
Band function
Time interval is from 17.404 sec. to 18.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.929088 ( 0.928554 0.928554 )
beta : -1.22143 ( 1.22131 0.29531 )
Epeak [keV] : 65.2155 ( -65.3177 -65.3177 )
Norm@50keV : 1.52797E-02 ( -0.00706697 564944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.80 using 59 PHA bins.
# Reduced chi-squared = 0.8328 for 55 degrees of freedom
# Null hypothesis probability = 8.068784e-01
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] : 19.5190 (-4.1351 5.83667)
R^2/D10^2 : 4.77623E-02 (-0.0271221 0.0574291)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.61 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.159990e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.541e-09 1.147e-09
25- 50 1.735e-08 5.156e-09
50-150 4.883e-08 1.614e-08
15-150 6.972e-08 1.886e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.10316 (-0.648275 0.648212)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.26 using 59 PHA bins.
# Reduced chi-squared = 0.8817 for 57 degrees of freedom
# Null hypothesis probability = 7.241855e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.022e-08 5.885e-09
25- 50 1.965e-08 1.113e-08
50-150 4.311e-08 2.447e-08
15-150 7.298e-08 4.064e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.86119 (-2.51677 2.66054)
R1^2/D10^2 : 1.78530 (-1.58858 6.10603)
kT2 [keV] : 31.2547 (-10.1928 145.742)
R2^2/D10^2 : 9.50810E-03 (-0.00877061 0.0245028)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.29 using 59 PHA bins.
# Reduced chi-squared = 0.8416 for 55 degrees of freedom
# Null hypothesis probability = 7.923632e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.290e-09 5.551e-09
25- 50 1.634e-08 8.462e-09
50-150 6.087e-08 3.381e-08
15-150 8.650e-08 4.363e-08
Plot creation:
Tue Feb 3 13:31:22 EST 2015