batgrbproduct Analysis for Trigger=431605
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 00:37:44 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger431605/GCN5_download_cron
======================================================================
Trigger: 00431605 Segment: 000
BAT Trigger Time: 303450617.344 [s; MET]
Trigger Stop: 303450618.368 [s; MET]
UTC: 2010-08-14T03:50:11.265420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.4806329492837 Dec: -17.9856336940265 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.15
Image Trigger?: NO
Rate S/N Ratio: 57.28874234961 [ if not an image trigger ]
Image S/N Ratio: 19.15
Flight Position: [ source = BAT ]
RA: 22.4806329492837 Dec: -17.9856336940265 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.4790541795798 Dec: -17.9905039079663 [deg; J2000]
{ 01h 29m 55.0s , -17d 59' 25.8" }
+/- 0.545685186314971 [arcmin] (estimated 90% radius based on SNR)
+/- 0.157417337672946 [arcmin] (formal 1-sigma fit error)
SNR: 72.2628836850687
Angular difference between Flight and Ground position is 0.305787 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 174.715999901295 +/- 9.46817490453253
Measured from: -0.0399998426437378
to: 174.676000058651 [s; relative to TRIGTIME]
T50: 97.1999999284744 +/- 5.8548663725284
Measured from: 9.59600013494492
to: 106.796000063419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0600000023841858
to: 0.939999997615814 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.2039999961853
to: 234.643999993801 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.789072 5.133240 4.164680 0.983477
0.078148 0.080448 0.072592 0.063995 [error]
Peak 0.038620 0.091831 0.148447 0.056136
0.005835 0.006700 0.006999 0.005450 [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 1.17e-06 2.19e-06 3.16e-06 9.65e-06 8.98e-06 1.62e-05 erg/cm2
Error 5.28e-08 5.60e-08 7.92e-08 5.77e-07 1.95e-07 6.08e-07 erg/cm2
Peak flux Power-law 3.74e-01 6.54e-01 8.75e-01 2.40e+00 2.55e+00 4.30e+00 ph/cm2/s
Error 5.43e-02 5.83e-02 5.12e-02 3.11e-01 1.55e-01 3.14e-01 ph/cm2/s
Fluence Cutoff-PL 1.13e-06 2.21e-06 3.20e-06 7.93e-06 8.89e-06 1.45e-05 erg/cm2
Error 7.12e-08 5.82e-08 9.03e-08 1.38e-06 2.12e-07 1.41e-06 erg/cm2
Peak flux Cutoff-PL 3.73e-01 3.15e-01 6.54e-01 9.32e-01 1.59e+00 2.51e+00 ph/cm2/s
Error 6.23e-02 7.19e-02 2.77e-01 0.00e+00 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 1.473 0.041 - - 3.97e-03 8.32e-05 32.910 57
CPL 1.319 0.158 252.4 -74.9 4.64e-03 7.19e-04 30.390 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 0.580 0.108 - - 2.18e-02 1.44e-03 56.550 57
CPL 0.089 0.469 253.4 1275.2 3.37e-02 1.42e-02 52.990 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: 147.200000 sec.
T50 in the 50-300 keV band: 68.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 237.848 -3.204 234.644
T90 174.716 -0.040 174.676
T50 97.200 9.596 106.796
Peak 1.000 -0.060 0.940
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.4791 -17.9905 0.0027 26.3 -12.4 4.7193 72.3 TRIG_00431605
------------------------------------------
Foreground time interval of the image:
-3.204 15.257 (delta_t = 18.461 [sec])
Background time interval of the image:
-239.344 -3.204 (delta_t = 236.140 [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
Multiple GTIs in the spectrum
tstart tstop
-3.204000 219.926000
220.656000 234.644000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47267 ( -0.0412734 0.0412543 )
Norm@50keV : 3.97358E-03 ( -8.32234e-05 8.32132e-05 )
------------------------------------------------------------
# Chi-Squared = 32.91 using 59 PHA bins.
# Reduced chi-squared = 0.5773 for 57 degrees of freedom
# Null hypothesis probability = 9.956343e-01
Photon flux (15-150 keV) in 237.1 sec: 0.492503 ( -0.0118241 0.0118689 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.97895e-06 ( -1.95021e-07 1.95188e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.204000 219.926000
220.656000 234.644000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31948 ( -0.170207 0.145815 )
Epeak [keV] : 252.370 ( -102.651 -252.37 )
Norm@50keV : 4.64084E-03 ( -0.000590014 0.000848729 )
------------------------------------------------------------
# Chi-Squared = 30.39 using 59 PHA bins.
# Reduced chi-squared = 0.5426 for 56 degrees of freedom
# Null hypothesis probability = 9.979515e-01
Photon flux (15-150 keV) in 237.1 sec: 0.485955 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89094e-06 ( -2.19483e-07 2.03859e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.204000 219.926000
220.656000 234.644000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29686 ( 0.981343 5.33948 )
beta : -1.61213 ( 1.61349 0.158175 )
Epeak [keV] : 221.298 ( -221.872 -221.872 )
Norm@50keV : 4.75755E-03 ( -0.000620621 17.143 )
------------------------------------------------------------
# Chi-Squared = 30.32 using 59 PHA bins.
# Reduced chi-squared = 0.5513 for 55 degrees of freedom
# Null hypothesis probability = 9.972385e-01
Photon flux (15-150 keV) in 237.1 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 -0.060 sec. to 0.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.580398 ( -0.109647 0.106115 )
Norm@50keV : 2.17626E-02 ( -0.00145339 0.00143547 )
------------------------------------------------------------
# Chi-Squared = 56.55 using 59 PHA bins.
# Reduced chi-squared = 0.9921 for 57 degrees of freedom
# Null hypothesis probability = 4.918287e-01
Photon flux (15-150 keV) in 1 sec: 2.54718 ( -0.154764 0.155022 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80944e-07 ( -1.72505e-08 1.72733e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 0.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.90985E-02 ( -0.505803 0.431694 )
Epeak [keV] : 253.352 ( -94.7148 2455.77 )
Norm@50keV : 3.36903E-02 ( -0.0105458 0.0178284 )
------------------------------------------------------------
# Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9463 for 56 degrees of freedom
# Null hypothesis probability = 5.894472e-01
Photon flux (15-150 keV) in 1 sec: 2.51004 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78543e-07 ( -1.7832e-08 1.773e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 0.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.982142 ( 0.982142 0.982142 )
beta : -0.580411 ( -0.106033 0.109768 )
Epeak [keV] : 15.8455 ( -15.8455 -15.8455 )
Norm@50keV : 2.98363E-02 ( -0.00947979 238061 )
------------------------------------------------------------
# Chi-Squared = 56.55 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.167946e-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 01:03:39 EDT 2010