batgrbproduct Analysis for Trigger=540255
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 Dec 3 09:33:42 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger540255/GCN5_download_cron
======================================================================
Trigger: 00540255 Segment: 000
BAT Trigger Time: 376114814.976 [s; MET]
Trigger Stop: 376114816 [s; MET]
UTC: 2012-12-02T04:20:05.038260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.81487469703 Dec: 23.9520792363031 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 256.81487469703 Dec: 23.9520792363031 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.790391377635 Dec: 23.9423667806835 [deg; J2000]
{ 17h 07m 09.7s , +23d 56' 32.5" }
+/- 1.1922669122554 [arcmin] (estimated 90% radius based on SNR)
+/- 0.422555628320171 [arcmin] (formal 1-sigma fit error)
SNR: 23.6599265457012
Angular difference between Flight and Ground position is 1.463567 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 20.0479999780655 +/- 1.92356750693182
Measured from: -1.30399990081787
to: 18.7440000772476 [s; relative to TRIGTIME]
T50: 10.4199999570847 +/- 1.46696557546308
Measured from: 3.22000008821487
to: 13.6400000452995 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0160000324249268
to: 0.983999967575073 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.18400001525879
to: 20.8439999818802 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.525831 0.704697 0.506575 0.096748
0.037152 0.037929 0.033783 0.029484 [error]
Peak 0.040407 0.057215 0.036759 0.008053
0.008160 0.008225 0.007577 0.006149 [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 1.75e-07 3.04e-07 4.03e-07 1.09e-06 1.18e-06 1.97e-06 erg/cm2
Error 1.81e-08 1.93e-08 3.34e-08 1.92e-07 8.01e-08 2.18e-07 erg/cm2
Peak flux Power-law 4.74e-01 4.13e-01 2.46e-01 2.21e-01 1.23e+00 1.36e+00 ph/cm2/s
Error 1.22e-01 7.02e-02 6.04e-02 1.06e-01 2.08e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.60e-07 3.22e-07 4.13e-07 4.83e-07 1.38e-06 0.00e+00 erg/cm2
Error 2.14e-08 2.42e-08 3.65e-08 3.12e-07 3.21e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.23e-01 4.54e-01 2.54e-01 8.38e-02 1.19e+00 1.21e+00 ph/cm2/s
Error 1.41e-01 9.16e-02 7.03e-02 1.46e-01 2.15e-01 2.60e-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 1.593 0.107 - - 5.46e-03 3.45e-04 38.770 57
CPL 1.026 0.470 83.5 66.4 1.07e-02 6.33e-03 33.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.745 0.295 - - 9.10e-03 1.73e-03 54.900 57
CPL 0.872 1.366 58.6 -22.4 2.72e-02 9.97e-02 53.300 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: 19.840000 sec.
T50 in the 50-300 keV band: 9.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 23.028 -2.184 20.844
T90 20.048 -1.304 18.744
T50 10.420 3.220 13.640
Peak 1.000 -0.016 0.984
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.7904 +23.9424 0.0081 33.5 -26.4 2.0214 23.7 TRIG_00540255
------------------------------------------
Foreground time interval of the image:
-2.184 20.844 (delta_t = 23.028 [sec])
Background time interval of the image:
-60.976 -2.184 (delta_t = 58.792 [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 -2.184 sec. to 20.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59333 ( -0.106935 0.107814 )
Norm@50keV : 5.46251E-03 ( -0.000345494 0.000344086 )
------------------------------------------------------------
# Chi-Squared = 38.77 using 59 PHA bins.
# Reduced chi-squared = 0.6802 for 57 degrees of freedom
# Null hypothesis probability = 9.691615e-01
Photon flux (15-150 keV) in 23.03 sec: 0.700515 ( -0.0438171 0.0438821 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17748e-06 ( -7.98125e-08 8.03171e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.184 sec. to 20.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02575 ( -0.497535 0.4434 )
Epeak [keV] : 83.4667 ( -19.3373 113.55 )
Norm@50keV : 1.06987E-02 ( -0.00428768 0.00836454 )
------------------------------------------------------------
# Chi-Squared = 33.87 using 59 PHA bins.
# Reduced chi-squared = 0.6048 for 56 degrees of freedom
# Null hypothesis probability = 9.915828e-01
Photon flux (15-150 keV) in 23.03 sec: 0.681056 ( -0.046387 0.046337 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37916e-06 ( -2.28545e-07 4.13902e-07 ) ergs/cm2
Band function
Time interval is from -2.184 sec. to 20.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.777515 ( -0.645423 0.767862 )
beta : -1.93556 ( 1.92567 0.297434 )
Epeak [keV] : 65.6179 ( -37.1401 89.6949 )
Norm@50keV : 1.52286E-02 ( -0.00981146 182.714 )
------------------------------------------------------------
# Chi-Squared = 33.20 using 59 PHA bins.
# Reduced chi-squared = 0.6037 for 55 degrees of freedom
# Null hypothesis probability = 9.912320e-01
Photon flux (15-150 keV) in 23.03 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] : 13.9141 (-1.01298 1.10858)
R^2/D10^2 : 0.101287 (-0.0245242 0.0318745)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 77.90 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 57 degrees of freedom
# Null hypothesis probability = 3.438250e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.545e-08 1.143e-08
25- 50 3.528e-07 2.902e-08
50-150 4.483e-07 5.757e-08
15-150 8.966e-07 7.059e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 171.324 (23.9908 -102.068)
Norm : 2.87230 (-0.192219 0.212854)
------------------------------------------------------------
# Chi-Squared = 34.56 using 59 PHA bins.
# Reduced chi-squared = 0.6063 for 57 degrees of freedom
# Null hypothesis probability = 9.918199e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.677e-07 1.467e-08
25- 50 3.167e-07 2.061e-08
50-150 6.585e-07 9.085e-08
15-150 1.143e-06 1.014e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.43636 (-1.90659 2.0728)
R1^2/D10^2 : 0.584526 (-0.297841 0.603629)
kT2 [keV] : 24.2650 (-5.34651 12.3384)
R2^2/D10^2 : 1.01828E-02 (-0.00786816 0.0175181)
------------------------------------------------------------
# Chi-Squared = 35.53 using 59 PHA bins.
# Reduced chi-squared = 0.6459 for 55 degrees of freedom
# Null hypothesis probability = 9.808115e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.512e-07 3.706e-08
25- 50 3.308e-07 8.549e-08
50-150 6.363e-07 2.771e-07
15-150 1.118e-06 3.399e-07
Peak spectrum fit
Power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74495 ( -0.286427 0.304103 )
Norm@50keV : 9.10480E-03 ( -0.00175006 0.00170771 )
------------------------------------------------------------
# Chi-Squared = 54.90 using 59 PHA bins.
# Reduced chi-squared = 0.9632 for 57 degrees of freedom
# Null hypothesis probability = 5.542321e-01
Photon flux (15-150 keV) in 1 sec: 1.22884 ( -0.208317 0.208486 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.40382e-08 ( -1.64064e-08 1.68172e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.871886 ( -1.5758 1.15576 )
Epeak [keV] : 58.6424 ( -13.77 -58.6425 )
Norm@50keV : 2.72284E-02 ( -0.0272281 0.172072 )
------------------------------------------------------------
# Chi-Squared = 53.30 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 56 degrees of freedom
# Null hypothesis probability = 5.776575e-01
Photon flux (15-150 keV) in 1 sec: 1.19022 ( -0.215157 0.21497 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.82572e-08 ( -1.75866e-08 1.85439e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.936349 ( -0.934045 1.28293 )
beta : -9.37162 ( 9.99993 19.9999 )
Epeak [keV] : 60.4677 ( -20.8754 -60.4136 )
Norm@50keV : 2.49237E-02 ( -0.0135671 0.0220517 )
------------------------------------------------------------
# Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9693 for 55 degrees of freedom
# Null hypothesis probability = 5.393927e-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] : 12.1564 (-2.28795 2.84107)
R^2/D10^2 : 0.288449 (-0.154991 0.331265)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 58.60 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.164753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.024e-09 3.036e-09
25- 50 2.883e-08 7.290e-09
50-150 2.584e-08 9.835e-09
15-150 6.370e-08 1.524e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 109.717 (-40.0275 -100.148)
Norm : 5.35979 (-1.06831 1.45814)
------------------------------------------------------------
# Chi-Squared = 53.61 using 59 PHA bins.
# Reduced chi-squared = 0.9405 for 57 degrees of freedom
# Null hypothesis probability = 6.031852e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.400e-08 2.945e-09
25- 50 2.464e-08 4.645e-09
50-150 4.201e-08 9.740e-09
15-150 8.065e-08 1.533e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.64410 (-3.10036 4.98522)
R1^2/D10^2 : 2.59108 (-2.19704 79.1289)
kT2 [keV] : 17.9216 (-5.54255 37.5522)
R2^2/D10^2 : 5.46197E-02 (-0.0534516 0.191397)
------------------------------------------------------------
# Chi-Squared = 53.09 using 59 PHA bins.
# Reduced chi-squared = 0.9653 for 55 degrees of freedom
# Null hypothesis probability = 5.477933e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.351e-08 7.400e-09
25- 50 2.491e-08 1.317e-08
50-150 3.837e-08 2.250e-08
15-150 7.679e-08 4.083e-08
Plot creation:
Mon Dec 3 09:48:04 EST 2012