batgrbproduct Analysis for Trigger=431582
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): Sat Aug 14 10:21:45 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger431582/GCN5_download_cron
======================================================================
Trigger: 00431582 Segment: 000
BAT Trigger Time: 303426216 [s; MET]
Trigger Stop: 303426280 [s; MET]
UTC: 2010-08-13T21:03:29.922300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.818168771101 Dec: -28.1946652116778 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 266.818168771101 Dec: -28.1946652116778 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.823775033833 Dec: -28.183446409772 [deg; J2000]
{ 17h 47m 17.7s , -28d 11' 00.4" }
+/- 2.47411687572929 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03344047754808 [arcmin] (formal 1-sigma fit error)
SNR: 8.33853020588301
Angular difference between Flight and Ground position is 0.735528 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 125.007999956608 +/- 27.8022991910229
Measured from: -14.7719998955727
to: 110.236000061035 [s; relative to TRIGTIME]
T50: 56.9799999594688 +/- 22.3641140982164
Measured from: 33.8480001091957
to: 90.8280000686646 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 75.9039999842644
to: 76.9039999842644 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.5120000243187
to: 113.867999970913 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.210100 0.199337 0.041928 0.006455
0.068098 0.061863 0.052282 0.044619 [error]
Peak 0.021846 0.006787 0.012065 0.004882
0.005694 0.005108 0.004296 0.003736 [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 3.39e-07 9.06e-08 1.29e-08 2.07e-09 4.44e-07 4.44e-07 erg/cm2
Error 4.59e-08 2.97e-08 9.87e-09 2.93e-09 6.36e-08 6.41e-08 erg/cm2
Peak flux Power-law 1.38e-01 1.01e-01 4.91e-02 3.39e-02 3.04e-01 3.21e-01 ph/cm2/s
Error 1.10e-01 4.06e-02 3.65e-02 5.86e-02 1.17e-01 1.27e-01 ph/cm2/s
Fluence Cutoff-PL 3.43e-07 8.08e-08 3.89e-09 2.74e-11 4.27e-07 4.28e-07 erg/cm2
Error 4.79e-08 3.31e-08 1.23e-08 3.00e-09 6.78e-08 6.88e-08 erg/cm2
Peak flux Cutoff-PL 1.37e-01 1.01e-01 4.91e-02 3.37e-02 3.03e-01 3.21e-01 ph/cm2/s
Error 1.10e-01 4.06e-02 3.66e-02 1.27e-01 0.00e+00 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 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 4.851 0.615 - - 6.86e-05 4.27e-05 51.960 57
CPL 1.000 0.000 50.0 0.0 1.03e-03 0.00e+00 149.880 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.038 0.992 - - 1.99e-03 1.12e-03 46.440 57
CPL 2.194 0.000 79.8 0.0 1.54e-03 0.00e+00 46.270 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 148.380 -34.512 113.868
T90 125.008 -14.772 110.236
T50 56.980 33.848 90.828
Peak 1.000 75.904 76.904
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.8238 -28.1834 0.0230 10.8 -48.9 1.3002 8.3 TRIG_00431582
------------------------------------------
Foreground time interval of the image:
-34.512 113.868 (delta_t = 148.380 [sec])
Background time interval of the image:
-198.499 -34.512 (delta_t = 163.987 [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 -34.512 sec. to 113.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.85130 ( -0.618804 0.611039 )
Norm@50keV : 6.85634E-05 ( -3.17523e-05 5.36722e-05 )
------------------------------------------------------------
# Chi-Squared = 51.96 using 59 PHA bins.
# Reduced chi-squared = 0.9116 for 57 degrees of freedom
# Null hypothesis probability = 6.640769e-01
Photon flux (15-150 keV) in 148.4 sec: 9.18959E-02 ( -0.0120145 0.0120151 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.43587e-07 ( -6.28149e-08 6.44682e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.512 sec. to 113.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.03193E-03 ( )
------------------------------------------------------------
# Chi-Squared = 149.88 using 59 PHA bins.
# Reduced chi-squared = 2.6765 for 56 degrees of freedom
# Null hypothesis probability = 1.672260e-10
Photon flux (15-150 keV) in 148.4 sec: 9.18179E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27147e-07 ( -6.14955e-08 7.41807e-08 ) ergs/cm2
Band function
Time interval is from -34.512 sec. to 113.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.02203 ( 2.02203 2.02203 )
beta : -4.81298 ( -0.646351 0.5806 )
Epeak [keV] : 0.160383 ( -0.160383 -0.160383 )
Norm@50keV : 3.64495 ( -3.64495 6.05717e+06 )
------------------------------------------------------------
# Chi-Squared = 51.95 using 59 PHA bins.
# Reduced chi-squared = 0.9446 for 55 degrees of freedom
# Null hypothesis probability = 5.918724e-01
Photon flux (15-150 keV) in 148.4 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from 75.904 sec. to 76.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03761 ( -0.858643 1.12617 )
Norm@50keV : 1.98754E-03 ( -0.00120354 0.00104173 )
------------------------------------------------------------
# Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8148 for 57 degrees of freedom
# Null hypothesis probability = 8.398662e-01
Photon flux (15-150 keV) in 1 sec: 0.303519 ( -0.117202 0.117204 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8375e-08 ( -8.92825e-09 9.94354e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 75.904 sec. to 76.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19443 ( )
Epeak [keV] : 79.7505 ( )
Norm@50keV : 1.54223E-03 ( )
------------------------------------------------------------
# Chi-Squared = 46.27 using 59 PHA bins.
# Reduced chi-squared = 0.8262 for 56 degrees of freedom
# Null hypothesis probability = 8.198599e-01
Photon flux (15-150 keV) in 1 sec: 0.303379 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83898e-08 ( -8.91321e-09 9.9371e-09 ) ergs/cm2
Band function
Time interval is from 75.904 sec. to 76.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98595 ( -137.886 -137.886 )
beta : -2.03039 ( -1.78064 0.84457 )
Epeak [keV] : 17.7060 ( -17.6408 12.4073 )
Norm@50keV : 3169.86 ( -3306.75 91557.5 )
------------------------------------------------------------
# Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 55 degrees of freedom
# Null hypothesis probability = 7.898136e-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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Sat Aug 14 11:01:56 EDT 2010