batgrbproduct Analysis for Trigger=425151
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Tue Jun 22 01:06:44 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger425151/GCN5_download_cron
======================================================================
Trigger: 00425151 Segment: 000
BAT Trigger Time: 298782218.752 [s; MET]
Trigger Stop: 298782219.776 [s; MET]
UTC: 2010-06-21T03:03:32.840140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.308020107616 Dec: -51.0864237917052 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.67
Image Trigger?: NO
Rate S/N Ratio: 58.7537232862735 [ if not an image trigger ]
Image S/N Ratio: 18.67
Flight Position: [ source = BAT ]
RA: 315.308020107616 Dec: -51.0864237917052 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 315.308775562482 Dec: -51.1024140697786 [deg; J2000]
{ 21h 01m 14.1s , -51d 06' 08.7" }
+/- 0.503396840931475 [arcmin] (estimated 90% radius based on SNR)
+/- 0.113214496446826 [arcmin] (formal 1-sigma fit error)
SNR: 81.0887383104544
Angular difference between Flight and Ground position is 0.959839 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 63.5839999914169 +/- 1.68360084354133
Measured from: 1.2360001206398
to: 64.8200001120567 [s; relative to TRIGTIME]
T50: 25.7199999690056 +/- 0.714926567161452
Measured from: 17.9200001358986
to: 43.6400001049042 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.4640000462532
to: 25.4640000462532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.09999996423721
to: 204.192000031471 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 14.208217 14.644219 8.411128 1.627354
0.093370 0.094970 0.081179 0.064571 [error]
Peak 0.433843 0.635792 0.449944 0.071640
0.010793 0.012588 0.011116 0.006425 [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 4.21e-06 6.07e-06 6.52e-06 1.30e-05 2.08e-05 2.98e-05 erg/cm2
Error 1.40e-07 1.14e-07 1.11e-07 5.32e-07 3.04e-07 5.60e-07 erg/cm2
Peak flux Power-law 4.22e+00 4.25e+00 3.01e+00 3.38e+00 1.28e+01 1.48e+01 ph/cm2/s
Error 1.35e-01 9.10e-02 8.67e-02 1.87e-01 2.70e-01 3.34e-01 ph/cm2/s
Fluence Cutoff-PL 4.10e-06 6.08e-06 6.57e-06 1.18e-05 2.07e-05 2.86e-05 erg/cm2
Error 1.94e-07 1.15e-07 6.55e-08 1.17e-06 3.43e-07 1.50e-06 erg/cm2
Peak flux Cutoff-PL 3.92e+00 4.58e+00 3.16e+00 1.74e+00 1.27e+01 1.34e+01 ph/cm2/s
Error 1.53e-01 1.21e-01 9.87e-02 2.66e-01 2.72e-01 3.63e-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 1.39e+01 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 1.898 0.030 - - 1.09e-02 1.58e-04 42.320 57
CPL 1.814 0.114 128.3 -42.2 1.18e-02 1.25e-03 40.920 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.499 0.034 - - 1.03e-01 2.34e-03 99.330 57
CPL 0.918 0.143 89.0 11.6 2.10e-01 3.67e-02 44.600 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: 53.184000 sec.
T50 in the 50-300 keV band: 15.936000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 210.292 -6.100 204.192
T90 63.584 1.236 64.820
T50 25.720 17.920 43.640
Peak 1.000 24.464 25.464
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
315.3088 -51.1024 0.0024 17.1 -145.2 6.6367 81.1 TRIG_00425151
------------------------------------------
Foreground time interval of the image:
-6.100 12.349 (delta_t = 18.449 [sec])
Background time interval of the image:
-43.351 -6.100 (delta_t = 37.251 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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
-6.100000 98.548000
99.248000 148.428000
149.248000 204.192000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89810 ( -0.0299447 0.0299412 )
Norm@50keV : 1.08531E-02 ( -0.000158101 0.000158053 )
------------------------------------------------------------
# Chi-Squared = 42.32 using 59 PHA bins.
# Reduced chi-squared = 0.7425 for 57 degrees of freedom
# Null hypothesis probability = 9.265084e-01
Photon flux (15-150 keV) in 208.8 sec: 1.55628 ( -0.0315742 0.0318055 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08338e-05 ( -3.03981e-07 3.0403e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-6.100000 98.548000
99.248000 148.428000
149.248000 204.192000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81400 ( -0.123351 0.104717 )
Epeak [keV] : 128.295 ( -43.8381 -128.295 )
Norm@50keV : 1.17864E-02 ( -0.00102731 0.00147778 )
------------------------------------------------------------
# Chi-Squared = 40.92 using 59 PHA bins.
# Reduced chi-squared = 0.7308 for 56 degrees of freedom
# Null hypothesis probability = 9.348225e-01
Photon flux (15-150 keV) in 208.8 sec: 1.53882 ( -0.03927 0.03952 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07042e-05 ( -3.51243e-07 3.34665e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-6.100000 98.548000
99.248000 148.428000
149.248000 204.192000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81401 ( 1.59118 6.06726 )
beta : -9.96487 ( 85.6878 95.604 )
Epeak [keV] : 128.285 ( -33.7904 -128.285 )
Norm@50keV : 1.17834E-02 ( -0.00103629 0.0014781 )
------------------------------------------------------------
# Chi-Squared = 40.92 using 59 PHA bins.
# Reduced chi-squared = 0.7441 for 55 degrees of freedom
# Null hypothesis probability = 9.210939e-01
Photon flux (15-150 keV) in 208.8 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] : 15.7317 ( )
R^2/D10^2 : 0.118485 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 1125.25 using 59 PHA bins.
# Reduced chi-squared = 19.7413 for 57 degrees of freedom
# Null hypothesis probability = 3.539300e-198
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.271e-06 4.061e-08
25- 50 5.269e-06 1.232e-07
50-150 9.055e-06 1.963e-07
15-150 1.559e-05 2.516e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 111.596 (5.21779 18.2608)
Norm : 6.26633 (-0.16543 0.170933)
------------------------------------------------------------
# Chi-Squared = 84.70 using 59 PHA bins.
# Reduced chi-squared = 1.486 for 57 degrees of freedom
# Null hypothesis probability = 1.006370e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.416e-06 9.187e-08
25- 50 6.032e-06 1.148e-07
50-150 1.038e-05 2.203e-07
15-150 1.982e-05 2.923e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.02012 (-0.372555 0.38924)
R1^2/D10^2 : 1.80118 (-0.341765 0.442327)
kT2 [keV] : 25.1816 (-1.17883 1.34951)
R2^2/D10^2 : 1.59405E-02 (-0.00296932 0.00337141)
------------------------------------------------------------
# Chi-Squared = 69.71 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 55 degrees of freedom
# Null hypothesis probability = 8.746300e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.352e-06 1.963e-07
25- 50 6.192e-06 1.764e-07
50-150 1.046e-05 2.955e-07
15-150 2.000e-05 4.176e-07
Peak spectrum fit
Power-law model
Time interval is from 24.464 sec. to 25.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49881 ( -0.0338336 0.0340562 )
Norm@50keV : 0.102564 ( -0.00233854 0.00233263 )
------------------------------------------------------------
# Chi-Squared = 99.33 using 59 PHA bins.
# Reduced chi-squared = 1.743 for 57 degrees of freedom
# Null hypothesis probability = 4.397180e-04
Photon flux (15-150 keV) in 1 sec: 12.7999 ( -0.270016 0.269997 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.73159e-07 ( -2.46901e-08 2.47421e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.464 sec. to 25.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.918028 ( -0.145589 0.140822 )
Epeak [keV] : 88.9640 ( -9.21415 13.9284 )
Norm@50keV : 0.210302 ( -0.0328929 0.0405655 )
------------------------------------------------------------
# Chi-Squared = 44.60 using 59 PHA bins.
# Reduced chi-squared = 0.7964 for 56 degrees of freedom
# Null hypothesis probability = 8.634998e-01
Photon flux (15-150 keV) in 1 sec: 12.6916 ( -0.2719 0.2716 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.38599e-07 ( -2.6414e-08 2.642e-08 ) ergs/cm2
Band function
Time interval is from 24.464 sec. to 25.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.812221 ( -0.223271 0.335622 )
beta : -2.01218 ( 2.01218 0.229039 )
Epeak [keV] : 78.7084 ( -18.3083 21.5975 )
Norm@50keV : 0.244854 ( -0.0623818 0.156843 )
------------------------------------------------------------
# Chi-Squared = 43.86 using 59 PHA bins.
# Reduced chi-squared = 0.7974 for 55 degrees of freedom
# Null hypothesis probability = 8.597666e-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] : 13.7437 ( )
R^2/D10^2 : 2.07662 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 471.64 using 59 PHA bins.
# Reduced chi-squared = 8.2744 for 57 degrees of freedom
# Null hypothesis probability = 1.333995e-66
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.299e-08 2.995e-09
25- 50 3.030e-07 7.000e-09
50-150 3.732e-07 1.870e-08
15-150 7.592e-07 1.975e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.984 ( )
Norm : 52.7000 (-52.7 -52.7)
------------------------------------------------------------
# Chi-Squared = 62.66 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.824485e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.312e-07 6.685e-08
25- 50 2.525e-07 1.284e-07
50-150 5.537e-07 2.811e-07
15-150 9.374e-07 4.761e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.97011 (-0.599566 0.621619)
R1^2/D10^2 : 12.7009 (-2.81575 3.98616)
kT2 [keV] : 23.5430 (-1.75515 2.15474)
R2^2/D10^2 : 0.234763 (-0.0682437 0.0843434)
------------------------------------------------------------
# Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.052939e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.220e-07 5.250e-09
25- 50 2.622e-07 1.005e-08
50-150 5.518e-07 3.140e-08
15-150 9.359e-07 4.190e-08
Plot creation:
Tue Jun 22 01:42:33 EDT 2010