batgrbproduct Analysis for Trigger=558399
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 Jun 18 03:39:23 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger558399/GCN5_download_cron
======================================================================
Trigger: 00558399 Segment: 000
BAT Trigger Time: 393155560.944 [s; MET]
Trigger Stop: 393155560.96 [s; MET]
UTC: 2013-06-17T09:52:30.259560 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.714151615488 Dec: -54.2768302799622 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 27.6405499221705 [ if not an image trigger ]
Image S/N Ratio: 8.57
Flight Position: [ source = BAT ]
RA: 237.714151615488 Dec: -54.2768302799622 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.721174163164 Dec: -54.3007219105831 [deg; J2000]
{ 15h 50m 53.1s , -54d 18' 02.6" }
+/- 1.27546247579649 [arcmin] (estimated 90% radius based on SNR)
+/- 0.492034253928338 [arcmin] (formal 1-sigma fit error)
SNR: 21.4864438410339
Angular difference between Flight and Ground position is 1.454443 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 0.13999992609024 +/- 0.0126491362748289
Measured from: 1.19209289550781e-07
to: 0.14000004529953 [s; relative to TRIGTIME]
T50: 0.0799999833106995 +/- 0.0144221847352656
Measured from: 0.0160000920295715
to: 0.096000075340271 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.424000024795532
to: 0.575999975204468 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.15200001001358 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.044827 0.082896 0.036666 0.003145
0.004188 0.005199 0.003856 0.001833 [error]
Peak 0.044146 0.078716 0.044068 0.006661
0.007181 0.007853 0.006253 0.004693 [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 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 Power-law 5.01e-01 4.67e-01 3.02e-01 3.01e-01 1.39e+00 1.57e+00 ph/cm2/s
Error 9.27e-02 5.94e-02 4.88e-02 9.14e-02 1.75e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 1.13e-08 3.56e-08 2.77e-08 2.74e-09 7.72e-08 7.73e-08 erg/cm2
Error 2.24e-09 3.39e-09 4.14e-09 1.66e-09 6.85e-09 6.93e-09 erg/cm2
Peak flux Cutoff-PL 3.61e-01 5.97e-01 3.31e-01 1.33e+00 1.33e+00 0.00e+00 ph/cm2/s
Error 1.12e-01 8.82e-02 6.53e-02 1.78e-01 1.82e-01 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 2.160 0.000 - - 4.58e-02 0.00e+00 138.220 57
CPL -1.544 0.897 46.2 2.9 4.39e+00 6.38e+00 50.040 56
The chi2 of BB fit is 49.46 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 1.630 0.189 - - 1.07e-02 1.42e-03 69.760 57
CPL -0.755 1.371 52.9 9.0 2.06e-01 7.24e-01 54.160 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.156 -0.004 0.152
T90 0.140 0.000 0.140
T50 0.080 0.016 0.096
Peak 1.000 -0.424 0.576
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7212 -54.3007 0.0090 22.0 19.5 0.1707 21.5 TRIG_00558399
------------------------------------------
Foreground time interval of the image:
-0.004 0.152 (delta_t = 0.156 [sec])
Background time interval of the image:
-239.944 -0.004 (delta_t = 239.940 [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 0.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15976 ( )
Norm@50keV : 4.58098E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 138.22 using 59 PHA bins.
# Reduced chi-squared = 2.4249 for 57 degrees of freedom
# Null hypothesis probability = 1.068270e-08
Photon flux (15-150 keV) in 0.156 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.54426 ( -0.981564 0.812405 )
Epeak [keV] : 46.2282 ( -2.8731 2.92657 )
Norm@50keV : 4.39127 ( -2.7292 10.037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.8936 for 56 degrees of freedom
# Null hypothesis probability = 6.987513e-01
Photon flux (15-150 keV) in 0.156 sec: 8.03826 ( -0.69191 0.69308 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.71716e-08 ( -6.83951e-09 6.85854e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.54658 ( -1.0688 0.810117 )
beta : -9.98140 ( 9.9814 19.9768 )
Epeak [keV] : 46.2170 ( -2.86912 2.91866 )
Norm@50keV : 4.40599 ( -2.74073 10.7683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.9099 for 55 degrees of freedom
# Null hypothesis probability = 6.640720e-01
Photon flux (15-150 keV) in 0.156 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] : 11.9322 (-0.742377 0.754825)
R^2/D10^2 : 2.41820 (-0.514823 0.659663)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.46 using 59 PHA bins.
# Reduced chi-squared = 0.8677 for 57 degrees of freedom
# Null hypothesis probability = 7.507043e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.135e-08 1.536e-09
25- 50 3.550e-08 3.175e-09
50-150 3.027e-08 5.218e-09
15-150 7.712e-08 7.270e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.3149 (-8.53166 9.77768)
Norm : 43.9462 (-4.99719 5.11679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.19 using 59 PHA bins.
# Reduced chi-squared = 1.705 for 57 degrees of freedom
# Null hypothesis probability = 7.213484e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.715e-08 1.796e-09
25- 50 2.587e-08 2.231e-09
50-150 2.874e-08 4.914e-09
15-150 7.176e-08 6.700e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.99910 (-1.99649 11.0042)
R1^2/D10^2 : 980.298 (-993.436 -993.436)
kT2 [keV] : 12.1324 (-0.802067 0.870255)
R2^2/D10^2 : 2.23089 (-0.578476 0.596903)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
# Reduced chi-squared = 0.8711 for 55 degrees of freedom
# Null hypothesis probability = 7.399502e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.224e-08 1.717e-09
25- 50 3.461e-08 4.157e-09
50-150 3.082e-08 5.288e-09
15-150 7.767e-08 8.315e-09
Peak spectrum fit
Power-law model
Time interval is from -0.424 sec. to 0.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62953 ( -0.186893 0.191834 )
Norm@50keV : 1.07475E-02 ( -0.00142108 0.00140972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.76 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.194419e-01
Photon flux (15-150 keV) in 1 sec: 1.39402 ( -0.174797 0.174927 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00178e-07 ( -1.39082e-08 1.40677e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.424 sec. to 0.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.754973 ( -1.57543 1.16659 )
Epeak [keV] : 52.8943 ( -6.82019 11.1721 )
Norm@50keV : 0.206173 ( -0.212003 1.23665 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.16 using 59 PHA bins.
# Reduced chi-squared = 0.9672 for 56 degrees of freedom
# Null hypothesis probability = 5.447122e-01
Photon flux (15-150 keV) in 1 sec: 1.32542 ( -0.17825 0.17848 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.424 sec. to 0.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.772421 ( -1.04858 1.32718 )
beta : -9.99994 ( 9.99994 19.9998 )
Epeak [keV] : 52.8169 ( -6.41645 11.1552 )
Norm@50keV : 0.211082 ( -0.211082 1.22139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.16 using 59 PHA bins.
# Reduced chi-squared = 0.9848 for 55 degrees of freedom
# Null hypothesis probability = 5.066529e-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] : 13.0737 (-1.41493 1.61215)
R^2/D10^2 : 0.282359 (-0.0991131 0.14668)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.90 using 59 PHA bins.
# Reduced chi-squared = 0.9631 for 57 degrees of freedom
# Null hypothesis probability = 5.544350e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.024e-08 2.245e-09
25- 50 3.547e-08 6.120e-09
50-150 3.845e-08 9.740e-09
15-150 8.415e-08 1.247e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 135.146 (-48.7434 -133.49)
Norm : 5.94728 (-0.758258 0.989945)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.20 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.389046e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.539e-08 3.200e-09
25- 50 2.809e-08 1.144e-08
50-150 5.301e-08 3.082e-08
15-150 9.649e-08 4.251e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.16 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.14 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9854 for 55 degrees of freedom
# Reduced chi-squared = 0.9847 for 55 degrees of freedom
# Reduced chi-squared = 0.9843 for 55 degrees of freedom
# Reduced chi-squared = 0.9824 for 55 degrees of freedom
# Null hypothesis probability = 5.052746e-01
# Null hypothesis probability = 5.068615e-01
# Null hypothesis probability = 5.075518e-01
# Null hypothesis probability = 5.116534e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.150e-08 3.604e-09
25- 50 3.418e-08 8.625e-09
50-150 4.001e-08 1.203e-08
15-150 8.570e-08 2.157e-08
Plot creation:
Tue Jun 18 04:01:07 EDT 2013