batgrbproduct Analysis for Trigger=571271
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 Sep 23 23:02:46 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger571271/batgroup_hand_proc
======================================================================
Trigger: 00571271 Segment: 000
BAT Trigger Time: 401281656 [s; MET]
Trigger Stop: 401281720 [s; MET]
UTC: 2013-09-19T11:07:24.949420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.28832904434 Dec: -10.3555440490979 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.9
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.9
Flight Position: [ source = BAT ]
RA: 207.28832904434 Dec: -10.3555440490979 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 207.278358884458 Dec: -10.3555761918324 [deg; J2000]
{ 13h 49m 06.8s , -10d 21' 20.1" }
+/- 1.56568429089189 [arcmin] (estimated 90% radius based on SNR)
+/- 0.600552698430167 [arcmin] (formal 1-sigma fit error)
SNR: 16.0313291571999
Angular difference between Flight and Ground position is 0.588469 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 98.095999956131 +/- 25.624366550303
Measured from: -14.6520000100136
to: 83.4439999461174 [s; relative to TRIGTIME]
T50: 45.4799999594688 +/- 6.5871672423087
Measured from: 0.736000001430511
to: 46.2159999608994 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -6.34399998188019
to: -5.34399998188019 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.7239999771118
to: 108.068000018597 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.616977 0.982216 0.578116 0.108227
0.068241 0.065229 0.058029 0.052288 [error]
Peak 0.014819 0.032702 0.016766 0.004591
0.006278 0.005945 0.005311 0.004760 [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 2.12e-07 3.69e-07 4.93e-07 1.34e-06 1.44e-06 2.42e-06 erg/cm2
Error 2.78e-08 3.07e-08 5.59e-08 3.18e-07 1.34e-07 3.66e-07 erg/cm2
Peak flux Power-law 1.78e-01 1.84e-01 1.34e-01 1.57e-01 5.58e-01 6.54e-01 ph/cm2/s
Error 7.43e-02 4.89e-02 4.25e-02 1.02e-01 1.41e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 1.74e-07 4.20e-07 5.01e-07 2.63e-07 1.28e-06 1.36e-06 erg/cm2
Error 3.41e-08 4.20e-08 6.65e-08 2.29e-07 1.51e-07 2.69e-07 erg/cm2
Peak flux Cutoff-PL 1.55e-01 2.10e-01 1.36e-01 5.31e-01 5.40e-01 0.00e+00 ph/cm2/s
Error 8.96e-02 7.76e-02 1.56e-01 2.11e-01 0.00e+00 0.00e+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 1.584 0.141 - - 1.18e-03 1.01e-04 64.760 57
CPL 0.260 0.807 61.5 15.2 5.85e-03 7.17e-03 53.880 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 1.456 0.429 - - 4.52e-03 1.16e-03 53.700 57
CPL 0.306 3.524 65.3 -12.9 1.95e-02 1.60e+01 53.020 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: 65.728000 sec.
T50 in the 50-300 keV band: 40.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 129.792 -21.724 108.068
T90 98.096 -14.652 83.444
T50 45.480 0.736 46.216
Peak 1.000 -6.344 -5.344
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
207.2784 -10.3556 0.0120 18.8794 -97.5960 2.1664535 16.031 TRIG_00571271
Foreground time interval of the image:
-11.699 108.068 (delta_t = 119.767 [sec])
Background time interval of the image:
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 -21.724 sec. to 108.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58445 ( -0.139945 0.142136 )
Norm@50keV : 1.17995E-03 ( -0.000101785 0.000101123 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.76 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.241193e-01
Photon flux (15-150 keV) in 129.8 sec: 0.150908 ( -0.0124271 0.0124406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43515e-06 ( -1.33283e-07 1.34865e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.724 sec. to 108.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.260286 ( -0.883022 0.730662 )
Epeak [keV] : 61.4773 ( -9.19624 21.2621 )
Norm@50keV : 5.84604E-03 ( -0.00339073 0.0109578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9622 for 56 degrees of freedom
# Null hypothesis probability = 5.555097e-01
Photon flux (15-150 keV) in 129.8 sec: 0.141626 ( -0.013325 0.013347 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27763e-06 ( -1.47866e-07 1.54897e-07 ) ergs/cm2
Band function
Time interval is from -21.724 sec. to 108.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.260666 ( -0.451283 0.660874 )
beta : -10.00000 ( 10 1.10974e-06 )
Epeak [keV] : 61.4721 ( -8.04855 21.2479 )
Norm@50keV : 5.84374E-03 ( -0.00046803 0.0109723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9796 for 55 degrees of freedom
# Null hypothesis probability = 5.174429e-01
Photon flux (15-150 keV) in 129.8 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] : 13.4767 (-1.13642 1.26544)
R^2/D10^2 : 2.52248E-02 (-0.00699289 0.00945819)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.92 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.748998e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.260e-07 1.907e-08
25- 50 4.507e-07 4.660e-08
50-150 5.282e-07 9.144e-08
15-150 1.105e-06 1.171e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 166.017 (-56.1501 -164.999)
Norm : 0.622438 (-0.0533142 0.0653434)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.41 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.878533e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.056e-07 3.180e-08
25- 50 3.864e-07 9.969e-08
50-150 7.941e-07 4.016e-07
15-150 1.386e-06 6.816e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.87528 ( )
R1^2/D10^2 : 5.27755E-02 (-0.0253857 55.3708)
kT2 [keV] : 25.8582 (-24.7139 -26.198)
R2^2/D10^2 : 1.26534E-03 (-0.00114079 0.0242027)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.02 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Reduced chi-squared = 1.000 for 55 degrees of freedom
# Null hypothesis probability = 4.637910e-01
# Null hypothesis probability = 4.737606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.772e-07 7.008e-08
25- 50 4.127e-07 1.116e-07
50-150 6.119e-07 1.568e-07
15-150 1.202e-06 2.877e-07
Peak spectrum fit
Power-law model
Time interval is from -6.344 sec. to -5.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45590 ( -0.428098 0.429341 )
Norm@50keV : 4.51983E-03 ( -0.00116455 0.00115085 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.70 using 59 PHA bins.
# Reduced chi-squared = 0.9422 for 57 degrees of freedom
# Null hypothesis probability = 5.995347e-01
Photon flux (15-150 keV) in 1 sec: 0.557824 ( -0.140478 0.140869 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32055e-08 ( -1.20146e-08 1.23887e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.344 sec. to -5.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.305686 ( -5.5193 1.52879 )
Epeak [keV] : 65.2528 ( -38.9174 -64.7235 )
Norm@50keV : 1.95439E-02 ( -0.0203163 32.0593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9468 for 56 degrees of freedom
# Null hypothesis probability = 5.884250e-01
Photon flux (15-150 keV) in 1 sec: 0.530914 ( -0.159232 0.152026 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -6.344 sec. to -5.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.66382 ( -4.66382 -4.66382 )
beta : -2.06397 ( -1.31864 0.710199 )
Epeak [keV] : 36.3672 ( -25.84 10.6154 )
Norm@50keV : 34.2379 ( -8.26061 1.81343e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.07 using 59 PHA bins.
# Reduced chi-squared = 0.9286 for 55 degrees of freedom
# Null hypothesis probability = 6.254226e-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] : 12.6831 (-2.96728 4.45522)
R^2/D10^2 : 0.118104 (-0.0783346 0.190414)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9422 for 57 degrees of freedom
# Null hypothesis probability = 5.994414e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.029e-09 1.835e-09
25- 50 1.351e-08 5.097e-09
50-150 1.354e-08 7.642e-09
15-150 3.107e-08 1.330e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-126.403 -199.363)
Norm : 2.29793 (-0.569016 0.569751)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9376 for 57 degrees of freedom
# Null hypothesis probability = 6.092465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.722e-09 3.552e-09
25- 50 1.101e-08 6.480e-09
50-150 2.414e-08 1.442e-08
15-150 4.087e-08 2.447e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.6872 (-3.58221 2.99997)
R1^2/D10^2 : 0.192543 ( )
kT2 [keV] : 199.295 (-199.318 -199.318)
R2^2/D10^2 : 6.28052E-05 (-3.18358e-05 0.0261694)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.34 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.18 using 59 PHA bins.
# Reduced chi-squared = 0.9152 for 55 degrees of freedom
# Reduced chi-squared = 0.9123 for 55 degrees of freedom
# Null hypothesis probability = 6.531516e-01
# Null hypothesis probability = 6.590003e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.741e-09 2.922e-09
25- 50 1.304e-08 8.415e-09
50-150 2.501e-08 1.252e-08
15-150 4.278e-08 2.230e-08
Plot creation:
Mon Sep 23 23:34:50 EDT 2013