batgrbproduct Analysis for Trigger=456939
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): Sun Jul 10 13:35:12 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger456939/GCN5_download_cron
======================================================================
Trigger: 00456939 Segment: 000
BAT Trigger Time: 331917876.288 [s; MET]
Trigger Stop: 331917877.312 [s; MET]
UTC: 2011-07-09T15:24:29.148680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 238.89550647638 Dec: 40.8976448151732 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.12
Image Trigger?: NO
Rate S/N Ratio: 108.52649446103 [ if not an image trigger ]
Image S/N Ratio: 18.12
Flight Position: [ source = BAT ]
RA: 238.89550647638 Dec: 40.8976448151732 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 238.895197846261 Dec: 40.9184415261718 [deg; J2000]
{ 15h 55m 34.8s , +40d 55' 06.4" }
+/- 0.518386245450625 [arcmin] (estimated 90% radius based on SNR)
+/- 0.138555658372076 [arcmin] (formal 1-sigma fit error)
SNR: 77.7600051007257
Angular difference between Flight and Ground position is 1.247881 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 44.3240000009537 +/- 0.552897821188691
Measured from: -0.563999891281128
to: 43.7600001096725 [s; relative to TRIGTIME]
T50: 27.4239999651909 +/- 0.226344906976873
Measured from: 6.83200013637543
to: 34.2560001015663 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 34.3080000281334
to: 35.3080000281334 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.2960000038147
to: 56.4760000109673 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.390012 5.349950 4.729904 1.412757
0.051546 0.056837 0.053601 0.042740 [error]
Peak 0.188776 0.304505 0.220961 0.048566
0.008286 0.009804 0.008959 0.005984 [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 1.00e-06 2.16e-06 3.67e-06 1.43e-05 1.01e-05 2.11e-05 erg/cm2
Error 3.77e-08 4.69e-08 6.34e-08 6.09e-07 1.63e-07 6.22e-07 erg/cm2
Peak flux Power-law 1.93e+00 2.03e+00 1.52e+00 1.83e+00 6.18e+00 7.31e+00 ph/cm2/s
Error 1.36e-01 8.77e-02 7.35e-02 1.83e-01 2.49e-01 2.92e-01 ph/cm2/s
Fluence Cutoff-PL 1.00e-06 2.16e-06 3.67e-06 1.42e-05 1.01e-05 2.10e-05 erg/cm2
Error 3.72e-08 4.69e-08 6.34e-08 6.04e-07 1.61e-07 1.24e-06 erg/cm2
Peak flux Cutoff-PL 1.77e+00 2.11e+00 1.58e+00 1.13e+00 6.06e+00 6.59e+00 ph/cm2/s
Error 1.66e-01 1.01e-01 8.47e-02 3.28e-01 2.60e-01 4.21e-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 1.238 0.031 - - 1.65e-02 2.73e-04 41.920 57
CPL 1.233 0.074 9999.4 0.0 1.66e-02 1.10e-03 41.920 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.425 0.068 - - 5.05e-02 1.99e-03 64.180 57
CPL 0.976 0.285 118.0 63.6 8.39e-02 2.71e-02 56.080 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: 41.344000 sec.
T50 in the 50-300 keV band: 20.672000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 60.772 -4.296 56.476
T90 44.324 -0.564 43.760
T50 27.424 6.832 34.256
Peak 1.000 34.308 35.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.8952 +40.9184 0.0025 18.5 152.8 6.4480 77.8 TRIG_00456939
------------------------------------------
Foreground time interval of the image:
-4.296 14.513 (delta_t = 18.809 [sec])
Background time interval of the image:
-239.288 -4.296 (delta_t = 234.992 [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 -4.296 sec. to 56.476 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23784 ( -0.0314338 0.031342 )
Norm@50keV : 1.64896E-02 ( -0.000273702 0.000273098 )
------------------------------------------------------------
# Chi-Squared = 41.92 using 59 PHA bins.
# Reduced chi-squared = 0.7355 for 57 degrees of freedom
# Null hypothesis probability = 9.326986e-01
Photon flux (15-150 keV) in 60.77 sec: 1.94648 ( -0.0362049 0.0363786 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00611e-05 ( -1.63239e-07 1.6334e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.296 sec. to 56.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23310 ( -0.133009 0.0140501 )
Epeak [keV] : 9999.35 ( )
Norm@50keV : 1.65634E-02 ( -0.000270381 0.00193386 )
------------------------------------------------------------
# Chi-Squared = 41.92 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 56 degrees of freedom
# Null hypothesis probability = 9.187989e-01
Photon flux (15-150 keV) in 60.77 sec: 1.94544 ( -0.03622 0.03604 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00636e-05 ( -1.63289e-07 1.59217e-07 ) ergs/cm2
Band function
Time interval is from -4.296 sec. to 56.476 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.320824 ( 0.582523 0.582523 )
beta : -1.24820 ( -0.0412176 0.0350952 )
Epeak [keV] : 38.6995 ( -38.6506 133.663 )
Norm@50keV : 0.219543 ( -0.220705 669.263 )
------------------------------------------------------------
# Chi-Squared = 40.00 using 59 PHA bins.
# Reduced chi-squared = 0.7273 for 55 degrees of freedom
# Null hypothesis probability = 9.357665e-01
Photon flux (15-150 keV) in 60.77 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] : 21.6497 ( )
R^2/D10^2 : 6.59787E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 784.05 using 59 PHA bins.
# Reduced chi-squared = 13.755 for 57 degrees of freedom
# Null hypothesis probability = 2.165219e-128
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.503e-07 1.167e-08
25- 50 1.835e-06 5.074e-08
50-150 6.422e-06 1.489e-07
15-150 8.607e-06 1.580e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 8.49347 ( )
------------------------------------------------------------
# Chi-Squared = 425.11 using 59 PHA bins.
# Reduced chi-squared = 7.4581 for 57 degrees of freedom
# Null hypothesis probability = 9.894798e-58
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.285e-06 6.499e-07
25- 50 2.472e-06 1.248e-06
50-150 5.422e-06 2.740e-06
15-150 9.180e-06 4.643e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.54457 (-0.554662 0.584693)
R1^2/D10^2 : 0.879255 (-0.171985 0.224824)
kT2 [keV] : 35.7462 (-2.23124 2.70376)
R2^2/D10^2 : 1.10415E-02 (-0.00229152 0.00258648)
------------------------------------------------------------
# Chi-Squared = 41.79 using 59 PHA bins.
# Reduced chi-squared = 0.7598 for 55 degrees of freedom
# Null hypothesis probability = 9.053564e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.573e-07 5.287e-08
25- 50 2.231e-06 7.657e-08
50-150 6.975e-06 2.218e-07
15-150 1.006e-05 2.887e-07
Peak spectrum fit
Power-law model
Time interval is from 34.308 sec. to 35.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42516 ( -0.0680207 0.0682806 )
Norm@50keV : 5.04813E-02 ( -0.00199574 0.00199379 )
------------------------------------------------------------
# Chi-Squared = 64.18 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.393501e-01
Photon flux (15-150 keV) in 1 sec: 6.18372 ( -0.248537 0.248748 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85345e-07 ( -2.11452e-08 2.12148e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 34.308 sec. to 35.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.975802 ( -0.294307 0.275024 )
Epeak [keV] : 117.984 ( -27.8542 99.2744 )
Norm@50keV : 8.38675E-02 ( -0.0219144 0.0322524 )
------------------------------------------------------------
# Chi-Squared = 56.08 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.718868e-01
Photon flux (15-150 keV) in 1 sec: 6.05520 ( -0.25981 0.25989 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71001e-07 ( -2.332e-08 2.3205e-08 ) ergs/cm2
Band function
Time interval is from 34.308 sec. to 35.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.210258 ( -0.704825 4.90443 )
beta : -1.62782 ( -0.298019 0.150412 )
Epeak [keV] : 57.4673 ( -28.0536 57.0348 )
Norm@50keV : 0.254171 ( -0.267143 914.287 )
------------------------------------------------------------
# Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9562 for 55 degrees of freedom
# Null hypothesis probability = 5.672494e-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] : 15.6405 ( )
R^2/D10^2 : 0.617341 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 169.57 using 59 PHA bins.
# Reduced chi-squared = 2.9750 for 57 degrees of freedom
# Null hypothesis probability = 4.118613e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.138e-08 2.350e-09
25- 50 1.295e-07 6.400e-09
50-150 2.194e-07 1.725e-08
15-150 3.802e-07 1.880e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.992 ( )
Norm : 25.5320 (-25.532 -25.532)
------------------------------------------------------------
# Chi-Squared = 67.58 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.593644e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.357e-08 3.263e-08
25- 50 1.223e-07 6.275e-08
50-150 2.682e-07 1.376e-07
15-150 4.541e-07 2.320e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.63076 (-1.23378 1.30812)
R1^2/D10^2 : 3.07799 (-1.01242 1.78647)
kT2 [keV] : 30.8558 (-5.1922 9.05061)
R2^2/D10^2 : 4.40701E-02 (-0.0254067 0.0422563)
------------------------------------------------------------
# Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9926 for 55 degrees of freedom
# Null hypothesis probability = 4.901799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.006e-08 6.995e-09
25- 50 1.270e-07 1.260e-08
50-150 2.966e-07 5.820e-08
15-150 4.737e-07 7.465e-08
Plot creation:
Sun Jul 10 13:58:49 EDT 2011