batgrbproduct Analysis for Trigger=506903
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 Nov 4 02:44:08 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger506903/GCN5_download_cron
======================================================================
Trigger: 00506903 Segment: 000
BAT Trigger Time: 342010751.488 [s; MET]
Trigger Stop: 342010752.512 [s; MET]
UTC: 2011-11-03T10:59:03.953720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.703554097257 Dec: 1.58984331586706 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.72
Image Trigger?: NO
Rate S/N Ratio: 47.3392015141785 [ if not an image trigger ]
Image S/N Ratio: 16.72
Flight Position: [ source = BAT ]
RA: 265.703554097257 Dec: 1.58984331586706 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.69072657514 Dec: 1.60547334318189 [deg; J2000]
{ 17h 42m 45.8s , +01d 36' 19.7" }
+/- 0.491917662184667 [arcmin] (estimated 90% radius based on SNR)
+/- 0.173621118732069 [arcmin] (formal 1-sigma fit error)
SNR: 83.8054131243052
Angular difference between Flight and Ground position is 1.213002 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 162.155999958515 +/- 32.4683653734477
Measured from: 0.0960001349449158
to: 162.25200009346 [s; relative to TRIGTIME]
T50: 31.6159999370575 +/- 0.907233158755201
Measured from: 5.70000016689301
to: 37.3160001039505 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.47600001096725
to: 6.47600001096725 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.54799997806549
to: 250.780000030994 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.333020 4.661985 3.701469 0.981070
0.102517 0.093719 0.079109 0.064282 [error]
Peak 0.190553 0.338997 0.305022 0.088252
0.008865 0.010236 0.009933 0.007117 [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 9.73e-07 1.88e-06 2.83e-06 9.18e-06 7.96e-06 1.49e-05 erg/cm2
Error 5.19e-08 5.70e-08 8.26e-08 6.41e-07 2.04e-07 6.73e-07 erg/cm2
Peak flux Power-law 1.84e+00 2.26e+00 2.01e+00 3.09e+00 7.18e+00 9.20e+00 ph/cm2/s
Error 1.27e-01 9.36e-02 8.04e-02 2.66e-01 2.57e-01 3.42e-01 ph/cm2/s
Fluence Cutoff-PL 9.73e-07 1.89e-06 2.83e-06 9.11e-06 7.96e-06 1.48e-05 erg/cm2
Error 5.43e-08 5.70e-08 8.26e-08 6.37e-07 2.00e-07 3.47e-07 erg/cm2
Peak flux Cutoff-PL 1.70e+00 2.31e+00 2.08e+00 2.18e+00 7.07e+00 8.28e+00 ph/cm2/s
Error 1.58e-01 1.03e-01 9.66e-02 5.60e-01 2.69e-01 6.21e-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 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 1.414 0.048 - - 3.21e-03 7.90e-05 50.710 57
CPL 1.405 0.106 9988.4 0.0 3.24e-03 3.07e-04 50.930 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.167 0.062 - - 6.14e-02 2.13e-03 50.960 57
CPL 0.839 0.252 194.1 211.3 8.73e-02 2.33e-02 45.600 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: 110.400000 sec.
T50 in the 50-300 keV band: 18.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 257.328 -6.548 250.780
T90 162.156 0.096 162.252
T50 31.616 5.700 37.316
Peak 1.000 5.476 6.476
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.6907 +1.6055 0.0023 13.6 -84.1 7.1590 83.8 TRIG_00506903
------------------------------------------
Foreground time interval of the image:
-6.548 12.113 (delta_t = 18.661 [sec])
Background time interval of the image:
-239.488 -6.548 (delta_t = 232.940 [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 -6.548 sec. to 250.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41415 ( -0.0484245 0.0482981 )
Norm@50keV : 3.21042E-03 ( -7.90171e-05 7.8992e-05 )
------------------------------------------------------------
# Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.8897 for 57 degrees of freedom
# Null hypothesis probability = 7.084759e-01
Photon flux (15-150 keV) in 257.3 sec: 0.392243 ( -0.0109309 0.0109905 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95901e-06 ( -2.03969e-07 2.04314e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.548 sec. to 250.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40513 ( -0.163074 0.049492 )
Epeak [keV] : 9988.40 ( -9906.91 -9906.91 )
Norm@50keV : 3.24009E-03 ( -7.84445e-05 0.000535717 )
------------------------------------------------------------
# Chi-Squared = 50.93 using 59 PHA bins.
# Reduced chi-squared = 0.9094 for 56 degrees of freedom
# Null hypothesis probability = 6.667603e-01
Photon flux (15-150 keV) in 257.3 sec: 0.392063 ( -0.010938 0.010883 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.96338e-06 ( -1.99227e-07 2.00977e-07 ) ergs/cm2
Band function
Time interval is from -6.548 sec. to 250.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.63210 ( -1.63229 -1.63229 )
beta : -1.43262 ( -0.0558544 0.0537639 )
Epeak [keV] : 27.8939 ( -27.8934 102.22 )
Norm@50keV : 0.696201 ( -0.697091 185.077 )
------------------------------------------------------------
# Chi-Squared = 48.60 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 55 degrees of freedom
# Null hypothesis probability = 7.162892e-01
Photon flux (15-150 keV) in 257.3 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] : 18.2785 ( )
R^2/D10^2 : 2.18047E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 422.25 using 59 PHA bins.
# Reduced chi-squared = 7.4078 for 57 degrees of freedom
# Null hypothesis probability = 3.441866e-57
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.734e-07 2.007e-08
25- 50 1.747e-06 6.304e-08
50-150 4.252e-06 1.865e-07
15-150 6.373e-06 1.827e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.987 ( )
Norm : 1.63900 (-1.639 -1.639)
------------------------------------------------------------
# Chi-Squared = 94.59 using 59 PHA bins.
# Reduced chi-squared = 1.659 for 57 degrees of freedom
# Null hypothesis probability = 1.295975e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-06 5.331e-07
25- 50 2.020e-06 1.025e-06
50-150 4.431e-06 2.249e-06
15-150 7.502e-06 3.809e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.70687 (-0.679805 0.736678)
R1^2/D10^2 : 0.283923 (-0.0759228 0.109934)
kT2 [keV] : 31.8791 (-2.9272 3.86552)
R2^2/D10^2 : 2.78514E-03 (-0.000872122 0.00108097)
------------------------------------------------------------
# Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9880 for 55 degrees of freedom
# Null hypothesis probability = 4.997550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.718e-07 8.324e-08
25- 50 1.942e-06 1.024e-07
50-150 5.136e-06 3.757e-07
15-150 7.950e-06 4.271e-07
Peak spectrum fit
Power-law model
Time interval is from 5.476 sec. to 6.476 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16738 ( -0.0616075 0.0614174 )
Norm@50keV : 6.14416E-02 ( -0.00213245 0.00213238 )
------------------------------------------------------------
# Chi-Squared = 50.96 using 59 PHA bins.
# Reduced chi-squared = 0.8941 for 57 degrees of freedom
# Null hypothesis probability = 6.997984e-01
Photon flux (15-150 keV) in 1 sec: 7.18062 ( -0.256853 0.257082 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.29243e-07 ( -2.42986e-08 2.43608e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.476 sec. to 6.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.838599 ( -0.258769 0.244447 )
Epeak [keV] : 194.089 ( -61.9149 360.626 )
Norm@50keV : 8.73406E-02 ( -0.0196374 0.0270333 )
------------------------------------------------------------
# Chi-Squared = 45.60 using 59 PHA bins.
# Reduced chi-squared = 0.8143 for 56 degrees of freedom
# Null hypothesis probability = 8.382239e-01
Photon flux (15-150 keV) in 1 sec: 7.07110 ( -0.26863 0.26872 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.16973e-07 ( -2.6463e-08 2.6299e-08 ) ergs/cm2
Band function
Time interval is from 5.476 sec. to 6.476 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.845023 ( -1.83724 -1.22518 )
beta : -1.29623 ( -0.136887 0.0958373 )
Epeak [keV] : 47.8429 ( -10.9861 67.1143 )
Norm@50keV : 1.10686 ( -1.10284 785.348 )
------------------------------------------------------------
# Chi-Squared = 39.83 using 59 PHA bins.
# Reduced chi-squared = 0.7241 for 55 degrees of freedom
# Null hypothesis probability = 9.383767e-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] : 18.9857 ( )
R^2/D10^2 : 0.393620 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 178.59 using 59 PHA bins.
# Reduced chi-squared = 3.1332 for 57 degrees of freedom
# Null hypothesis probability = 1.841704e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.790e-08 2.035e-09
25- 50 1.341e-07 6.350e-09
50-150 3.552e-07 2.095e-08
15-150 5.172e-07 2.285e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 29.6448 ( )
------------------------------------------------------------
# Chi-Squared = 152.36 using 59 PHA bins.
# Reduced chi-squared = 2.6729 for 57 degrees of freedom
# Null hypothesis probability = 1.252443e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.382e-08 3.776e-08
25- 50 1.420e-07 7.250e-08
50-150 3.114e-07 1.592e-07
15-150 5.273e-07 2.707e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.56096 (-1.32952 1.47691)
R1^2/D10^2 : 2.25045 (-0.71014 1.1672)
kT2 [keV] : 36.9502 (-6.25389 12.0194)
R2^2/D10^2 : 3.62777E-02 (-0.0206579 0.0308427)
------------------------------------------------------------
# Chi-Squared = 42.10 using 59 PHA bins.
# Reduced chi-squared = 0.7654 for 55 degrees of freedom
# Null hypothesis probability = 8.992559e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.795e-08 6.290e-09
25- 50 1.410e-07 1.515e-08
50-150 4.324e-07 9.225e-08
15-150 6.213e-07 8.700e-08
Plot creation:
Fri Nov 4 02:56:45 EDT 2011