batgrbproduct Analysis for Trigger=433160
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 Sep 6 13:48:56 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger433160/SDC
======================================================================
Trigger: 00433160 Segment: 000
BAT Trigger Time: 305148720 [s; MET]
Trigger Stop: 305148784 [s; MET]
UTC: 2010-09-02T19:31:53.860200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.6459500577974 Dec: 30.9725418949067 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 48.6459500577974 Dec: 30.9725418949067 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.6280267983659 Dec: 30.9689440532056 [deg; J2000]
{ 03h 14m 30.7s , +30d 58' 08.2" }
+/- 1.3206419448493 [arcmin] (estimated 90% radius based on SNR)
+/- 0.558828030952367 [arcmin] (formal 1-sigma fit error)
SNR: 20.4441122133364
Angular difference between Flight and Ground position is 0.947009 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 356.419999957085 +/- 76.6870206966546
Measured from: -37.1679999828339
to: 319.251999974251 [s; relative to TRIGTIME]
T50: 74.4679999351501 +/- 21.0305929635034
Measured from: 138.624000012875
to: 213.091999948025 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 207.888000011444
to: 208.888000011444 [s; relative to TRIGTIME]
Total Fluence
Measured from: -49.4279999732971
to: 409.632000029087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.450006 2.077013 1.287073 0.123639
0.120627 0.121151 0.109319 0.100416 [error]
Peak 0.037292 0.039596 0.029915 0.008952
0.006288 0.006205 0.005662 0.004964 [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 7.15e-07 9.43e-07 9.11e-07 1.57e-06 3.09e-06 4.14e-06 erg/cm2
Error 7.16e-08 6.03e-08 1.08e-07 3.81e-07 2.37e-07 4.86e-07 erg/cm2
Peak flux Power-law 3.60e-01 3.17e-01 1.91e-01 1.75e-01 9.43e-01 1.04e+00 ph/cm2/s
Error 8.20e-02 4.89e-02 4.56e-02 8.07e-02 1.45e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 7.12e-07 9.47e-07 9.11e-07 1.44e-06 3.07e-06 4.01e-06 erg/cm2
Error 7.33e-08 6.85e-08 1.10e-07 6.59e-07 2.63e-07 7.44e-07 erg/cm2
Peak flux Cutoff-PL 3.35e-01 3.41e-01 1.95e-01 7.94e-02 9.22e-01 9.50e-01 ph/cm2/s
Error 9.33e-02 6.36e-02 5.06e-02 1.49e-01 1.93e-01 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 3.41e-01 9.78e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.89e-01 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 2.049 0.137 - - 7.27e-04 6.03e-05 45.650 57
CPL 2.045 0.227 9999.4 0.0 7.29e-04 0.00e+00 45.650 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 1.727 0.278 - - 7.03e-03 1.28e-03 49.730 57
CPL 1.092 1.137 63.6 0.0 1.58e-02 0.00e+00 48.610 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: 97.024000 sec.
T50 in the 50-300 keV band: 54.464000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 459.060 -49.428 409.632
T90 356.420 -37.168 319.252
T50 74.468 138.624 213.092
Peak 1.000 207.888 208.888
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.6280 +30.9689 0.0094 20.7 -76.7 4.8541 20.4 TRIG_00433160
------------------------------------------
Foreground time interval of the image:
-3.899 260.301 (delta_t = 264.200 [sec])
Background time interval of the image:
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 -49.428 sec. to 409.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04871 ( -0.134873 0.139898 )
Norm@50keV : 7.27144E-04 ( -6.0884e-05 5.97548e-05 )
------------------------------------------------------------
# Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8008 for 57 degrees of freedom
# Null hypothesis probability = 8.598781e-01
Photon flux (15-150 keV) in 459.1 sec: 0.111588 ( -0.0072474 0.00726074 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08808e-06 ( -2.35317e-07 2.39023e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.428 sec. to 409.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04536 ( -0.311073 0.143059 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 7.28541E-04 ( )
------------------------------------------------------------
# Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8152 for 56 degrees of freedom
# Null hypothesis probability = 8.368892e-01
Photon flux (15-150 keV) in 459.1 sec: 0.111536 ( -0.007138 0.007254 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07418e-06 ( -2.72614e-07 2.52836e-07 ) ergs/cm2
Band function
Time interval is from -49.428 sec. to 409.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.04571 ( 2.04571 2.04571 )
beta : -2.04871 ( -0.139898 0.134896 )
Epeak [keV] : 0.563855 ( -0.563855 -0.563855 )
Norm@50keV : 9.88291E-02 ( -0.00827499 0.00812152 )
------------------------------------------------------------
# Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8300 for 55 degrees of freedom
# Null hypothesis probability = 8.114831e-01
Photon flux (15-150 keV) in 459.1 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
Peak spectrum fit
Power-law model
Time interval is from 207.888 sec. to 208.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72685 ( -0.269273 0.285829 )
Norm@50keV : 7.03149E-03 ( -0.00129625 0.00125952 )
------------------------------------------------------------
# Chi-Squared = 49.73 using 59 PHA bins.
# Reduced chi-squared = 0.8724 for 57 degrees of freedom
# Null hypothesis probability = 7.419366e-01
Photon flux (15-150 keV) in 1 sec: 0.942792 ( -0.145283 0.145286 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49757e-08 ( -1.22414e-08 1.26332e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 207.888 sec. to 208.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09230 ( -1.27633 0.996678 )
Epeak [keV] : 63.5615 ( )
Norm@50keV : 1.58500E-02 ( )
------------------------------------------------------------
# Chi-Squared = 48.61 using 59 PHA bins.
# Reduced chi-squared = 0.8680 for 56 degrees of freedom
# Null hypothesis probability = 7.479281e-01
Photon flux (15-150 keV) in 1 sec: 0.922419 ( -0.148444 0.148631 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1236e-08 ( -1.29717e-08 1.38774e-08 ) ergs/cm2
Band function
Time interval is from 207.888 sec. to 208.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09231 ( 1.32333 1.55589 )
beta : -10.00000 ( 3.49461e+11 3.49461e+11 )
Epeak [keV] : 63.5512 ( -23.3278 -63.5493 )
Norm@50keV : 1.58482E-02 ( -0.00980346 0.0644306 )
------------------------------------------------------------
# Chi-Squared = 48.61 using 59 PHA bins.
# Reduced chi-squared = 0.8838 for 55 degrees of freedom
# Null hypothesis probability = 7.158234e-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:
Thu May 26 13:44:35 EDT 2011