batgrbproduct Analysis for Trigger=431711
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 Aug 15 20:19:36 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger431711/GCN5_download_cron
======================================================================
Trigger: 00431711 Segment: 000
BAT Trigger Time: 303555800 [s; MET]
Trigger Stop: 303555928 [s; MET]
UTC: 2010-08-15T09:03:13.917620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.319846638631 Dec: -61.6089890129573 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.47
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 26.47
Flight Position: [ source = BAT ]
RA: 195.319846638631 Dec: -61.6089890129573 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.320555931859 Dec: -61.6016737989408 [deg; J2000]
{ 13h 01m 16.9s , -61d 36' 06.0" }
+/- 0.564007949418867 [arcmin] (estimated 90% radius based on SNR)
+/- 0.147983894822234 [arcmin] (formal 1-sigma fit error)
SNR: 68.9326859661787
Angular difference between Flight and Ground position is 0.439379 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 382.907999932766 +/- 15.3042304908827
Measured from: -125.767999887466
to: 257.1400000453 [s; relative to TRIGTIME]
T50: 140.05999994278 +/- 9.09977511623863
Measured from: -20.4039998650551
to: 119.656000077724 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 50.4319999814034
to: 51.4319999814034 [s; relative to TRIGTIME]
Total Fluence
Measured from: -149.283999979496
to: 284.864000022411 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 14.977448 10.708568 0.538967 0.162552
0.139609 0.138231 0.124469 0.134281 [error]
Peak 0.083375 0.070061 0.004604 -0.004536
0.006840 0.006467 0.005507 0.005847 [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 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 Power-law 8.72e-01 4.51e-01 1.45e-01 5.94e-02 1.50e+00 1.53e+00 ph/cm2/s
Error 9.65e-02 5.53e-02 3.51e-02 2.49e-02 1.51e-01 1.57e-01 ph/cm2/s
Fluence Cutoff-PL 4.57e-06 4.55e-06 4.34e-07 8.64e-10 9.55e-06 9.55e-06 erg/cm2
Error 3.46e-07 1.37e-07 7.61e-08 7.96e-10 3.95e-07 3.95e-07 erg/cm2
Peak flux Cutoff-PL 8.51e-01 5.47e-01 9.41e-02 2.98e-03 1.50e+00 1.50e+00 ph/cm2/s
Error 1.05e-01 7.62e-02 4.14e-02 1.46e-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 3.436 0.000 - - 1.83e-03 0.00e+00 324.150 57
CPL 1.000 0.000 50.0 0.0 6.58e-03 0.00e+00 1556.840 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 2.642 0.217 - - 6.99e-03 1.32e-03 66.210 57
CPL 0.637 1.166 21.9 8.5 1.58e-01 5.92e-01 54.550 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 434.148 -149.284 284.864
T90 382.908 -125.768 257.140
T50 140.060 -20.404 119.656
Peak 1.000 50.432 51.432
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.3206 -61.6017 0.0028 22.3 -177.2 23.5481 68.9 TRIG_00431711
------------------------------------------
Foreground time interval of the image:
-70.699 284.864 (delta_t = 355.563 [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 -149.284 sec. to 284.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.43610 ( )
Norm@50keV : 1.83378E-03 ( )
------------------------------------------------------------
# Chi-Squared = 324.15 using 59 PHA bins.
# Reduced chi-squared = 5.6868 for 57 degrees of freedom
# Null hypothesis probability = 5.020669e-39
Photon flux (15-150 keV) in 434.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -149.284 sec. to 284.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 6.58072E-03 ( )
------------------------------------------------------------
# Chi-Squared = 1556.84 using 59 PHA bins.
# Reduced chi-squared = 27.8007 for 56 degrees of freedom
# Null hypothesis probability = 9.502046e-289
Photon flux (15-150 keV) in 434.1 sec: 0.550348 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.54951e-06 ( -3.93208e-07 3.97245e-07 ) ergs/cm2
Band function
Time interval is from -149.284 sec. to 284.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42884 ( )
beta : -8.94612 ( )
Epeak [keV] : 11.3764 ( )
Norm@50keV : 2.47633E-02 ( )
------------------------------------------------------------
# Chi-Squared = 181.88 using 59 PHA bins.
# Reduced chi-squared = 3.3069 for 55 degrees of freedom
# Null hypothesis probability = 1.737637e-15
Photon flux (15-150 keV) in 434.1 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 50.432 sec. to 51.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64232 ( -0.20694 0.227472 )
Norm@50keV : 6.98676E-03 ( -0.00130744 0.00132913 )
------------------------------------------------------------
# Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.888790e-01
Photon flux (15-150 keV) in 1 sec: 1.50146 ( -0.15093 0.151157 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.28918e-08 ( -9.55091e-09 9.96156e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.432 sec. to 51.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.636772 ( -1.26593 1.06671 )
Epeak [keV] : 21.9327 ( -12.0296 5.00962 )
Norm@50keV : 0.157582 ( -0.157582 1.02586 )
------------------------------------------------------------
# Chi-Squared = 54.55 using 59 PHA bins.
# Reduced chi-squared = 0.9741 for 56 degrees of freedom
# Null hypothesis probability = 5.298810e-01
Photon flux (15-150 keV) in 1 sec: 1.49500 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56075e-08 ( -7.8215e-09 8.4772e-09 ) ergs/cm2
Band function
Time interval is from 50.432 sec. to 51.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.857376 ( -0.865053 1.49338 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 20.5255 ( -11.0783 6.4932 )
Norm@50keV : 0.113499 ( -0.113458 1.10524 )
------------------------------------------------------------
# Chi-Squared = 54.66 using 59 PHA bins.
# Reduced chi-squared = 0.9938 for 55 degrees of freedom
# Null hypothesis probability = 4.875510e-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:
Sun Aug 15 20:35:31 EDT 2010