batgrbproduct Analysis for Trigger=431128
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 8 00:54:38 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger431128/GCN5_download_cron
======================================================================
Trigger: 00431128 Segment: 000
BAT Trigger Time: 302865199.68 [s; MET]
Trigger Stop: 302865200.704 [s; MET]
UTC: 2010-08-07T09:13:13.622520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 55.324189348915 Dec: 67.6787633437716 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.13
Image Trigger?: NO
Rate S/N Ratio: 15.3297097167559 [ if not an image trigger ]
Image S/N Ratio: 9.13
Flight Position: [ source = BAT ]
RA: 55.324189348915 Dec: 67.6787633437716 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 55.3012747308337 Dec: 67.6655153228308 [deg; J2000]
{ 03h 41m 12.3s , +67d 39' 55.9" }
+/- 1.86913150698608 [arcmin] (estimated 90% radius based on SNR)
+/- 0.834942406876109 [arcmin] (formal 1-sigma fit error)
SNR: 12.4469068577099
Angular difference between Flight and Ground position is 0.951135 arcmin
Partial Coding Fraction: 0.3710938 [ including projection effects ]
Duration
T90: 8 +/- 2.82842712474619
Measured from: -5.67999988794327
to: 2.32000011205673 [s; relative to TRIGTIME]
T50: 3 +/- 1
Measured from: -2.67999988794327
to: 0.320000112056732 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.680000007152557
to: 0.319999992847443 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.68000000715256
to: 3.31999999284744 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.271435 0.267866 0.091080 0.030976
0.026509 0.027141 0.023392 0.020274 [error]
Peak 0.066371 0.076123 0.033823 0.006829
0.009131 0.009637 0.008146 0.006796 [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 9.66e-08 1.07e-07 8.47e-08 1.11e-07 3.29e-07 3.99e-07 erg/cm2
Error 1.44e-08 1.35e-08 2.08e-08 5.16e-08 4.79e-08 7.94e-08 erg/cm2
Peak flux Power-law 7.26e-01 5.43e-01 2.71e-01 1.93e-01 1.63e+00 1.73e+00 ph/cm2/s
Error 1.39e-01 7.74e-02 6.78e-02 9.02e-02 2.29e-01 2.50e-01 ph/cm2/s
Fluence Cutoff-PL 9.29e-08 1.18e-07 7.05e-08 1.85e-08 2.96e-07 3.00e-07 erg/cm2
Error 1.58e-08 1.98e-08 3.15e-08 7.20e-08 5.84e-08 1.03e-07 erg/cm2
Peak flux Cutoff-PL 7.12e-01 5.60e-01 2.72e-01 1.41e-01 1.62e+00 1.69e+00 ph/cm2/s
Error 1.50e-01 9.83e-02 7.10e-02 2.07e-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 6.00e-01 6.69e-01 1.68e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.26e-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 2.338 0.245 - - 3.42e-03 6.13e-04 51.570 57
CPL 1.359 1.290 23.3 0.0 1.43e-02 0.00e+00 49.870 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 2.003 0.269 - - 1.09e-02 2.06e-03 60.250 57
CPL 1.782 0.860 42.2 0.0 1.46e-02 0.00e+00 60.070 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: 0.832000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.000 -6.680 3.320
T90 8.000 -5.680 2.320
T50 3.000 -2.680 0.320
Peak 1.000 -0.680 0.320
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
55.3013 +67.6655 0.0155 33.0 -110.1 0.6408 12.4 TRIG_00431128
------------------------------------------
Foreground time interval of the image:
-6.680 3.320 (delta_t = 10.000 [sec])
Background time interval of the image:
-239.680 -6.680 (delta_t = 233.000 [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 -6.680 sec. to 3.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33811 ( -0.233828 0.255597 )
Norm@50keV : 3.42193E-03 ( -0.000618854 0.000607888 )
------------------------------------------------------------
# Chi-Squared = 51.57 using 59 PHA bins.
# Reduced chi-squared = 0.9048 for 57 degrees of freedom
# Null hypothesis probability = 6.781668e-01
Photon flux (15-150 keV) in 10 sec: 0.610955 ( -0.0706274 0.0706274 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29409e-07 ( -4.71081e-08 4.87207e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.680 sec. to 3.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35901 ( -1.93697 0.643102 )
Epeak [keV] : 23.3477 ( )
Norm@50keV : 1.42720E-02 ( )
------------------------------------------------------------
# Chi-Squared = 49.87 using 59 PHA bins.
# Reduced chi-squared = 0.8906 for 56 degrees of freedom
# Null hypothesis probability = 7.046296e-01
Photon flux (15-150 keV) in 10 sec: 0.591787 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96091e-07 ( -5.2911e-08 6.3941e-08 ) ergs/cm2
Band function
Time interval is from -6.680 sec. to 3.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.658576 ( -4.24529 4.01426 )
beta : -2.89838 ( 2.8995 0.606253 )
Epeak [keV] : 25.8225 ( -10.4703 7.31873 )
Norm@50keV : 4.42853E-02 ( -0.0485843 55.1975 )
------------------------------------------------------------
# Chi-Squared = 48.77 using 59 PHA bins.
# Reduced chi-squared = 0.8867 for 55 degrees of freedom
# Null hypothesis probability = 7.102235e-01
Photon flux (15-150 keV) in 10 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 -0.680 sec. to 0.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00337 ( -0.255003 0.282185 )
Norm@50keV : 1.08557E-02 ( -0.00209811 0.00201348 )
------------------------------------------------------------
# Chi-Squared = 60.25 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.591305e-01
Photon flux (15-150 keV) in 1 sec: 1.63087 ( -0.228727 0.228732 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00128e-07 ( -1.77404e-08 1.81941e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.680 sec. to 0.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78183 ( -1.06158 0.658887 )
Epeak [keV] : 42.2166 ( )
Norm@50keV : 1.45808E-02 ( )
------------------------------------------------------------
# Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 56 degrees of freedom
# Null hypothesis probability = 3.305204e-01
Photon flux (15-150 keV) in 1 sec: 1.62359 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84328e-08 ( -1.88056e-08 1.92312e-08 ) ergs/cm2
Band function
Time interval is from -0.680 sec. to 0.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78536 ( 1.78536 1.06444 )
beta : -9.37077 ( 9.99874 19.9987 )
Epeak [keV] : 42.2661 ( -42.2661 -42.2661 )
Norm@50keV : 1.45051E-02 ( -0.00441236 0.0373472 )
------------------------------------------------------------
# Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.971472e-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 8 01:09:52 EDT 2010