batgrbproduct Analysis for Trigger=556753
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 May 28 10:16:58 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger556753/batgroup_hand_proc
======================================================================
Trigger: 00556753 Segment: 000
BAT Trigger Time: 391357300.8 [s; MET]
Trigger Stop: 391357301.824 [s; MET]
UTC: 2013-05-27T14:21:30.195820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 309.278622826908 Dec: -24.7278211819239 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.89
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 13.89
Flight Position: [ source = BAT ]
RA: 309.278622826908 Dec: -24.7278211819239 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 309.281582399667 Dec: -24.7264043741267 [deg; J2000]
{ 20h 37m 07.6s , -24d 43' 35.1" }
+/- 1.07394701034929 [arcmin] (estimated 90% radius based on SNR)
+/- 0.415538320253173 [arcmin] (formal 1-sigma fit error)
SNR: 27.4699052161891
Angular difference between Flight and Ground position is 0.182323 arcmin
Partial Coding Fraction: 0.1005859 [ including projection effects ]
Duration
T90: 44.7679999470711 +/- 15.6084166746223
Measured from: -0.944000005722046
to: 43.823999941349 [s; relative to TRIGTIME]
T50: 17.5879999399185 +/- 6.73789997021258
Measured from: 0.972000002861023
to: 18.5599999427795 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0559999942779541
to: 1.05599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.86800003051758
to: 90.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.231245 5.646762 5.624966 2.450102
0.164106 0.178010 0.172454 0.149124 [error]
Peak 0.322107 0.737110 0.938388 0.499715
0.038496 0.051829 0.060688 0.053162 [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 1.27e-06 2.71e-06 4.54e-06 1.74e-05 1.25e-05 2.59e-05 erg/cm2
Error 9.09e-08 1.14e-07 1.72e-07 1.53e-06 4.40e-07 1.60e-06 erg/cm2
Peak flux Power-law 3.94e+00 5.80e+00 6.36e+00 1.31e+01 2.01e+01 2.92e+01 ph/cm2/s
Error 5.86e-01 5.25e-01 4.66e-01 2.10e+00 1.42e+00 2.33e+00 ph/cm2/s
Fluence Cutoff-PL 1.25e-06 2.72e-06 4.57e-06 1.61e-05 1.25e-05 2.46e-05 erg/cm2
Error 1.11e-07 1.20e-07 2.02e-07 3.39e-06 4.56e-07 3.14e-06 erg/cm2
Peak flux Cutoff-PL 3.95e+00 5.80e+00 6.36e+00 1.30e+01 2.01e+01 2.91e+01 ph/cm2/s
Error 6.48e-01 5.13e-01 4.92e-01 2.88e+00 1.42e+00 3.79e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.255 0.062 - - 1.33e-02 4.57e-04 54.840 57
CPL 1.164 0.171 500.4 0.0 1.46e-02 2.47e-03 55.010 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 0.867 0.121 - - 1.75e-01 1.24e-02 69.910 57
CPL 0.862 0.139 9999.4 0.0 1.76e-01 5.25e-02 69.910 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: 32.640000 sec.
T50 in the 50-300 keV band: 4.160000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 93.572 -2.868 90.704
T90 44.768 -0.944 43.824
T50 17.588 0.972 18.560
Peak 1.000 0.056 1.056
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
309.2816 -24.7264 0.0070 48.7593 155.8483 12.9479353 27.470 TRIG_00556753
Foreground time interval of the image:
-2.868 17.701 (delta_t = 20.569 [sec])
Background time interval of the image:
-644.699 -630.292 (delta_t = 14.408 [sec])
-239.800 -2.868 (delta_t = 236.932 [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 -2.868 sec. to 90.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25453 ( -0.0618419 0.0614848 )
Norm@50keV : 1.33373E-02 ( -0.000457712 0.000456883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.84 using 59 PHA bins.
# Reduced chi-squared = 0.9621 for 57 degrees of freedom
# Null hypothesis probability = 5.564663e-01
Photon flux (15-150 keV) in 93.57 sec: 1.57860 ( -0.0589228 0.0590909 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24748e-05 ( -4.39754e-07 4.40191e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.868 sec. to 90.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16389 ( -0.263563 0.0788309 )
Epeak [keV] : 500.354 ( -943.152 -943.152 )
Norm@50keV : 1.46179E-02 ( -0.00100113 0.00393818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 0.9823 for 56 degrees of freedom
# Null hypothesis probability = 5.124966e-01
Photon flux (15-150 keV) in 93.57 sec: 1.57315 ( -0.0615 0.06276 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24517e-05 ( -4.52411e-07 4.60364e-07 ) ergs/cm2
Band function
Time interval is from -2.868 sec. to 90.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.692494 ( 0.68692 3.64525 )
beta : -1.32991 ( 1.33023 0.101067 )
Epeak [keV] : 98.3654 ( -97.0145 247.695 )
Norm@50keV : 2.68392E-02 ( -0.0140936 0.904755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 55 degrees of freedom
# Null hypothesis probability = 5.689692e-01
Photon flux (15-150 keV) in 93.57 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] : 19.6228 ( )
R^2/D10^2 : 7.53721E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 232.06 using 59 PHA bins.
# Reduced chi-squared = 4.0713 for 57 degrees of freedom
# Null hypothesis probability = 5.510193e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.274e-07 3.626e-08
25- 50 2.594e-06 1.333e-07
50-150 7.383e-06 3.827e-07
15-150 1.050e-05 3.790e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.75640 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.93 using 59 PHA bins.
# Reduced chi-squared = 2.3672 for 57 degrees of freedom
# Null hypothesis probability = 2.893971e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.574e-06 6.176e-08
25- 50 3.028e-06 1.132e-07
50-150 6.642e-06 2.461e-07
15-150 1.124e-05 4.491e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.7768 (-1.2677 1.30944)
R1^2/D10^2 : 0.386426 (-0.106229 0.166558)
kT2 [keV] : 50.6319 (-11.5683 26.6466)
R2^2/D10^2 : 2.97029E-03 (-0.00190195 0.0033596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.41 using 59 PHA bins.
# Reduced chi-squared = 0.9893 for 55 degrees of freedom
# Null hypothesis probability = 4.971520e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.506e-07 1.086e-07
25- 50 2.964e-06 2.840e-07
50-150 8.459e-06 2.238e-06
15-150 1.237e-05 2.209e-06
Peak spectrum fit
Power-law model
Time interval is from 0.056 sec. to 1.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.866536 ( -0.122266 0.120098 )
Norm@50keV : 0.175166 ( -0.0124707 0.0124118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.91 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.171475e-01
Photon flux (15-150 keV) in 1 sec: 20.1043 ( -1.42322 1.4248 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99192e-06 ( -1.4994e-07 1.50296e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.056 sec. to 1.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.862490 ( -0.159411 0.119278 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 0.176405 ( -0.0123355 0.0925844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.91 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 56 degrees of freedom
# Null hypothesis probability = 1.000681e-01
Photon flux (15-150 keV) in 1 sec: 20.1054 ( -1.428 1.4104 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99044e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.056 sec. to 1.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.828439 ( 0.828114 0.828114 )
beta : -0.866536 ( -0.120085 0.122325 )
Epeak [keV] : 15.7431 ( -15.7449 -15.7449 )
Norm@50keV : 0.252465 ( -0.0926416 4.93938e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.91 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 55 degrees of freedom
# Null hypothesis probability = 8.498909e-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] : 24.8734 (-2.45325 2.8711)
R^2/D10^2 : 0.515750 (-0.143984 0.190804)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.94 using 59 PHA bins.
# Reduced chi-squared = 1.9463 for 57 degrees of freedom
# Null hypothesis probability = 2.494005e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.558e-08 8.245e-09
25- 50 3.145e-07 3.985e-08
50-150 1.444e-06 1.635e-07
15-150 1.814e-06 1.660e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 78.3294 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 154.10 using 59 PHA bins.
# Reduced chi-squared = 2.7036 for 57 degrees of freedom
# Null hypothesis probability = 7.113196e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.950e-07 1.745e-08
25- 50 3.752e-07 5.865e-08
50-150 8.229e-07 3.309e-07
15-150 1.393e-06 4.698e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1918 (-2.4954 3.13689)
R1^2/D10^2 : 4.50254 (-2.28179 5.71467)
kT2 [keV] : 50.2386 (-13.8525 53.801)
R2^2/D10^2 : 5.78858E-02 (-0.04133 0.0868132)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.68 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 55 degrees of freedom
# Null hypothesis probability = 1.016400e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.117e-07 3.956e-08
25- 50 3.597e-07 1.001e-07
50-150 1.546e-06 7.035e-07
15-150 2.018e-06 8.552e-07
Plot creation:
Tue May 28 10:35:40 EDT 2013