batgrbproduct Analysis for Trigger=571830
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): Thu Sep 26 01:21:30 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger571830/GCN5_download_cron
======================================================================
Trigger: 00571830 Segment: 000
BAT Trigger Time: 401775096 [s; MET]
Trigger Stop: 401775160 [s; MET]
UTC: 2013-09-25T04:11:24.926960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.1834870565618 Dec: -26.1344446281341 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 23.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 23.15
Flight Position: [ source = BAT ]
RA: 41.1834870565618 Dec: -26.1344446281341 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 41.1855796814181 Dec: -26.1464872283531 [deg; J2000]
{ 02h 44m 44.5s , -26d 08' 47.4" }
+/- 0.986567481680092 [arcmin] (estimated 90% radius based on SNR)
+/- 0.290976729920843 [arcmin] (formal 1-sigma fit error)
SNR: 31.0104929992447
Angular difference between Flight and Ground position is 0.731295 arcmin
Partial Coding Fraction: 0.09960938 [ including projection effects ]
Duration
T90: 161.115999937057 +/- 3.54089256630188
Measured from: -49.2439998984337
to: 111.872000038624 [s; relative to TRIGTIME]
T50: 83.8439999818802 +/- 2.22861748592165
Measured from: -28.6319999098778
to: 55.2120000720024 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -35.6359999775887
to: -34.6359999775887 [s; relative to TRIGTIME]
Total Fluence
Measured from: -59.5159999728203
to: 903.952000021935 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 25.659865 27.488084 15.089610 2.912397
0.281942 0.293363 0.246648 0.193896 [error]
Peak 0.260181 0.275018 0.212447 0.055434
0.021562 0.022617 0.019617 0.013804 [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 9.98e-06 1.28e-05 1.20e-05 1.99e-05 4.15e-05 5.47e-05 erg/cm2
Error 3.81e-07 2.74e-07 2.92e-07 1.10e-06 7.73e-07 1.27e-06 erg/cm2
Peak flux Power-law 3.07e+00 2.45e+00 1.31e+00 1.03e+00 7.29e+00 7.86e+00 ph/cm2/s
Error 4.15e-01 2.09e-01 1.62e-01 2.51e-01 6.32e-01 6.58e-01 ph/cm2/s
Fluence Cutoff-PL 9.39e-06 1.29e-05 1.22e-05 1.48e-05 4.07e-05 4.94e-05 erg/cm2
Error 5.18e-07 2.89e-07 3.19e-07 2.69e-06 9.20e-07 2.95e-06 erg/cm2
Peak flux Cutoff-PL 3.00e+00 2.48e+00 1.33e+00 8.71e-01 7.25e+00 7.68e+00 ph/cm2/s
Error 4.83e-01 2.42e-01 1.75e-01 4.00e-01 6.54e-01 8.10e-01 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 7.73e+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 2.092 0.038 - - 4.64e-03 8.72e-05 45.620 57
CPL 1.848 0.138 33.4 20.0 6.02e-03 9.78e-04 38.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.897 0.155 - - 5.09e-02 4.80e-03 49.950 57
CPL 1.752 0.577 84.3 0.0 6.05e-02 0.00e+00 49.750 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: 134.016000 sec.
T50 in the 50-300 keV band: 63.936000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 963.468 -59.516 903.952
T90 161.116 -49.244 111.872
T50 83.844 -28.632 55.212
Peak 1.000 -35.636 -34.636
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
41.1856 -26.1465 0.0062 40.8 123.2 24.8306 31.0 TRIG_00571830
------------------------------------------
Foreground time interval of the image:
-13.599 72.601 (delta_t = 86.200 [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
Multiple GTIs in the spectrum
tstart tstop
-59.516000 128.100000
129.000000 903.952000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09218 ( -0.0377832 0.0379194 )
Norm@50keV : 4.64412E-03 ( -8.72643e-05 8.72304e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.62 using 59 PHA bins.
# Reduced chi-squared = 0.8004 for 57 degrees of freedom
# Null hypothesis probability = 8.605431e-01
Photon flux (15-150 keV) in 962.6 sec: 0.727830 ( -0.0177437 0.0178794 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.15041e-05 ( -7.72598e-07 7.72615e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-59.516000 128.100000
129.000000 903.952000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84795 ( -0.159091 0.117429 )
Epeak [keV] : 33.3830 ( -29.5002 10.5804 )
Norm@50keV : 6.01638E-03 ( -0.000878529 0.00107758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.18 using 59 PHA bins.
# Reduced chi-squared = 0.6818 for 56 degrees of freedom
# Null hypothesis probability = 9.671405e-01
Photon flux (15-150 keV) in 962.6 sec: 0.707192 ( -0.021334 0.021579 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06982e-05 ( -9.20149e-07 9.19572e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-59.516000 128.100000
129.000000 903.952000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.84797 ( -0.140582 0.137522 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 33.3768 ( -20.5305 6.28447 )
Norm@50keV : 6.01459E-03 ( -0.000866423 0.00107985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.18 using 59 PHA bins.
# Reduced chi-squared = 0.6942 for 55 degrees of freedom
# Null hypothesis probability = 9.589833e-01
Photon flux (15-150 keV) in 962.6 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] : 13.1682 ( )
R^2/D10^2 : 0.102537 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 692.46 using 59 PHA bins.
# Reduced chi-squared = 12.148 for 57 degrees of freedom
# Null hypothesis probability = 5.539595e-110
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.629e-06 1.391e-07
25- 50 1.267e-05 3.128e-07
50-150 1.400e-05 4.957e-07
15-150 3.030e-05 6.353e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.4319 (-4.31458 4.73032)
Norm : 3.21621 (-0.1184 0.123335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.948598e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.007e-06 2.618e-07
25- 50 1.303e-05 2.984e-07
50-150 1.783e-05 5.679e-07
15-150 3.888e-05 7.364e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.67768 (-0.43231 0.445832)
R1^2/D10^2 : 1.06252 (-0.235765 0.326676)
kT2 [keV] : 22.4628 (-1.40501 1.64693)
R2^2/D10^2 : 9.44182E-03 (-0.00240681 0.00296843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.29 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.905610e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.799e-06 4.837e-07
25- 50 1.318e-05 4.380e-07
50-150 1.817e-05 7.845e-07
15-150 3.915e-05 1.271e-06
Peak spectrum fit
Power-law model
Time interval is from -35.636 sec. to -34.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89696 ( -0.151624 0.157679 )
Norm@50keV : 5.08979E-02 ( -0.00483682 0.00475687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.95 using 59 PHA bins.
# Reduced chi-squared = 0.8764 for 57 degrees of freedom
# Null hypothesis probability = 7.344019e-01
Photon flux (15-150 keV) in 1 sec: 7.29496 ( -0.631026 0.632635 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67927e-07 ( -4.36703e-08 4.39503e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.636 sec. to -34.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75198 ( -0.594337 0.558905 )
Epeak [keV] : 84.3092 ( )
Norm@50keV : 6.04708E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.8883 for 56 degrees of freedom
# Null hypothesis probability = 7.091162e-01
Photon flux (15-150 keV) in 1 sec: 7.24594 ( -0.65558 0.65313 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64399e-07 ( -4.612e-08 4.5896e-08 ) ergs/cm2
Band function
Time interval is from -35.636 sec. to -34.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75206 ( 1.65271 0.36966 )
beta : -10.0000 ( 10 1.59872e-14 )
Epeak [keV] : 84.2943 ( -45.0913 -84.2945 )
Norm@50keV : 6.04527E-02 ( -0.0142041 0.0599169 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.9045 for 55 degrees of freedom
# Null hypothesis probability = 6.749693e-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] : 12.6984 (-1.3733 1.50803)
R^2/D10^2 : 1.36431 (-0.465642 0.722611)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.73 using 59 PHA bins.
# Reduced chi-squared = 1.662 for 57 degrees of freedom
# Null hypothesis probability = 1.256762e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.666e-08 8.020e-09
25- 50 1.566e-07 1.710e-08
50-150 1.574e-07 3.045e-08
15-150 3.607e-07 3.815e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.3506 (-23.7446 38.2005)
Norm : 32.2612 (-3.86803 4.55079)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.47 using 59 PHA bins.
# Reduced chi-squared = 0.9030 for 57 degrees of freedom
# Null hypothesis probability = 6.817221e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.427e-08 1.105e-08
25- 50 1.440e-07 1.345e-08
50-150 2.256e-07 8.305e-08
15-150 4.539e-07 8.985e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.53121 (-1.01771 1.22933)
R1^2/D10^2 : 49.4446 (-31.6686 117.087)
kT2 [keV] : 19.0736 (-2.89807 4.01024)
R2^2/D10^2 : 0.249332 (-0.131491 0.228115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.77 using 59 PHA bins.
# Reduced chi-squared = 0.8686 for 55 degrees of freedom
# Null hypothesis probability = 7.445062e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.754e-08 4.634e-08
25- 50 1.264e-07 3.316e-08
50-150 2.308e-07 6.395e-08
15-150 4.547e-07 1.218e-07
Plot creation:
Thu Sep 26 02:00:50 EDT 2013