batgrbproduct Analysis for Trigger=554996
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): Fri May 3 19:27:18 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger554996/batgroup_hand_proc
======================================================================
Trigger: 00554996 Segment: 000
BAT Trigger Time: 389209841.152 [s; MET]
Trigger Stop: 389209841.216 [s; MET]
UTC: 2013-05-02T17:50:30.642920 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 138.577789038498 Dec: -0.143261927772071 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.75
Image Trigger?: NO
Rate S/N Ratio: 13.076696830622 [ if not an image trigger ]
Image S/N Ratio: 7.75
Flight Position: [ source = BAT ]
RA: 138.577789038498 Dec: -0.143261927772071 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 138.579437708235 Dec: -0.134499566093858 [deg; J2000]
{ 09h 14m 19.1s , -00d 08' 04.2" }
+/- 1.43543293858832 [arcmin] (estimated 90% radius based on SNR)
+/- 0.67198011023202 [arcmin] (formal 1-sigma fit error)
SNR: 18.1491831506703
Angular difference between Flight and Ground position is 0.534967 arcmin
Partial Coding Fraction: 0.4726562 [ including projection effects ]
Duration
T90: 3.04799991846085 +/- 0.29869043879192
Measured from: -0.11599987745285
to: 2.932000041008 [s; relative to TRIGTIME]
T50: 2.0799999833107 +/- 0.273232490013428
Measured from: 0.132000088691711
to: 2.21200007200241 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.216000020503998
to: 0.783999979496002 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.196000039577484
to: 3.19599997997284 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.200271 0.236311 0.177967 0.021405
0.019234 0.020602 0.018783 0.017687 [error]
Peak 0.084898 0.126925 0.105162 0.016778
0.011101 0.012313 0.011419 0.010000 [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 6.96e-08 1.08e-07 1.25e-07 2.80e-07 3.85e-07 5.83e-07 erg/cm2
Error 9.92e-09 1.02e-08 1.78e-08 8.00e-08 4.21e-08 9.76e-08 erg/cm2
Peak flux Power-law 1.10e+00 9.71e-01 5.88e-01 5.39e-01 2.89e+00 3.20e+00 ph/cm2/s
Error 1.81e-01 1.07e-01 9.01e-02 1.58e-01 3.17e-01 3.52e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 9.46e-01 1.09e+00 6.26e-01 2.80e+00 2.85e+00 0.00e+00 ph/cm2/s
Error 2.11e-01 1.39e-01 1.07e-01 3.22e-01 3.52e-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 9.59e-01 1.08e+00 2.88e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 2.08e-01 3.52e-01 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 1.782 0.164 - - 1.23e-02 1.31e-03 71.750 57
CPL 0.795 0.772 55.8 20.3 4.21e-02 5.02e-02 65.760 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.723 0.182 - - 2.16e-02 2.59e-03 82.550 57
CPL 0.650 0.830 58.9 22.7 8.08e-02 1.04e-01 76.440 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: 0.768000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.392 -0.196 3.196
T90 3.048 -0.116 2.932
T50 2.080 0.132 2.212
Peak 1.000 -0.216 0.784
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
138.5794 -0.1345 0.0106 43.3 -171.6 0.6805 18.1 TRIG_00554996
------------------------------------------
Foreground time interval of the image:
-0.196 3.196 (delta_t = 3.392 [sec])
Background time interval of the image:
-239.152 -0.196 (delta_t = 238.956 [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 -0.196 sec. to 3.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78211 ( -0.161541 0.167341 )
Norm@50keV : 1.23220E-02 ( -0.00131482 0.00129722 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.75 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 57 degrees of freedom
# Null hypothesis probability = 9.031683e-02
Photon flux (15-150 keV) in 3.392 sec: 1.68631 ( -0.161397 0.161529 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85053e-07 ( -4.17979e-08 4.23162e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.196 sec. to 3.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.795179 ( -0.83734 0.707609 )
Epeak [keV] : 55.8323 ( -10.3794 30.2912 )
Norm@50keV : 4.20951E-02 ( -0.0243139 0.0760227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.76 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 56 degrees of freedom
# Null hypothesis probability = 1.747755e-01
Photon flux (15-150 keV) in 3.392 sec: 1.62496 ( -0.16686 0.16701 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.196 sec. to 3.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.795120 ( -0.609348 0.809472 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 55.8212 ( -10.3355 30.201 )
Norm@50keV : 4.20974E-02 ( -0.0243169 0.0759269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.76 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 55 degrees of freedom
# Null hypothesis probability = 1.519379e-01
Photon flux (15-150 keV) in 3.392 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] : 12.3085 (-1.30928 1.44794)
R^2/D10^2 : 0.378962 (-0.127659 0.194134)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.27 using 59 PHA bins.
# Reduced chi-squared = 1.426 for 57 degrees of freedom
# Null hypothesis probability = 1.908276e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.126e-08 6.855e-09
25- 50 1.337e-07 1.560e-08
50-150 1.239e-07 2.576e-08
15-150 2.989e-07 3.624e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.8429 (-27.4895 51.1586)
Norm : 7.52183 (-0.94243 1.07487)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.03 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.707581e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.669e-08 1.019e-08
25- 50 1.153e-07 1.382e-08
50-150 1.866e-07 7.289e-08
15-150 3.686e-07 8.019e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.60662 (-1.60463 2.21384)
R1^2/D10^2 : 3.65348 (-2.41335 8.34376)
kT2 [keV] : 17.5029 (-3.21494 6.06268)
R2^2/D10^2 : 8.07285E-02 (-0.0582244 0.107575)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.38 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.811110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.359e-08 3.408e-08
25- 50 1.167e-07 4.855e-08
50-150 1.720e-07 9.308e-08
15-150 3.523e-07 1.414e-07
Peak spectrum fit
Power-law model
Time interval is from -0.216 sec. to 0.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72280 ( -0.177863 0.185251 )
Norm@50keV : 2.15863E-02 ( -0.00260859 0.00257321 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.55 using 59 PHA bins.
# Reduced chi-squared = 1.448 for 57 degrees of freedom
# Null hypothesis probability = 1.508481e-02
Photon flux (15-150 keV) in 1 sec: 2.89011 ( -0.316595 0.316785 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99529e-07 ( -2.49045e-08 2.52202e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.216 sec. to 0.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.650203 ( -0.898403 0.761799 )
Epeak [keV] : 58.9190 ( -11.4684 33.8704 )
Norm@50keV : 8.08045E-02 ( -0.0484589 0.158557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.44 using 59 PHA bins.
# Reduced chi-squared = 1.365 for 56 degrees of freedom
# Null hypothesis probability = 3.608177e-02
Photon flux (15-150 keV) in 1 sec: 2.80021 ( -0.32201 0.32251 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.216 sec. to 0.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.649998 ( -0.617593 0.975843 )
beta : -10.0000 ( 10 8.88178e-15 )
Epeak [keV] : 58.9050 ( -11.3254 33.8334 )
Norm@50keV : 8.08263E-02 ( -0.0484874 0.158278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.44 using 59 PHA bins.
# Reduced chi-squared = 1.390 for 55 degrees of freedom
# Null hypothesis probability = 2.948657e-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] : 13.0475 (-1.60459 1.76971)
R^2/D10^2 : 0.541741 (-0.200494 0.326955)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.80 using 59 PHA bins.
# Reduced chi-squared = 1.558 for 57 degrees of freedom
# Null hypothesis probability = 4.460583e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.956e-08 4.195e-09
25- 50 6.763e-08 9.985e-09
50-150 7.294e-08 1.661e-08
15-150 1.601e-07 2.300e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9594 (-31.0392 86.4701)
Norm : 12.9949 (-1.86206 1.81581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.57 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 57 degrees of freedom
# Null hypothesis probability = 3.070846e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.397e-08 5.670e-09
25- 50 5.873e-08 7.305e-09
50-150 9.514e-08 4.211e-08
15-150 1.878e-07 4.450e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.72479 (-1.53991 2.12698)
R1^2/D10^2 : 5.66822 (-3.75716 13.9425)
kT2 [keV] : 18.3021 (-3.30691 5.5068)
R2^2/D10^2 : 0.123893 (-0.0830424 0.132532)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.89 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 55 degrees of freedom
# Null hypothesis probability = 4.551619e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.126e-08 1.727e-08
25- 50 5.937e-08 2.567e-08
50-150 9.603e-08 5.319e-08
15-150 1.867e-07 8.669e-08
Plot creation:
Fri May 3 19:38:42 EDT 2013