batgrbproduct Analysis for Trigger=432420
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): Tue Aug 24 00:33:08 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger432420/GCN5_download_cron
======================================================================
Trigger: 00432420 Segment: 000
BAT Trigger Time: 304277141.824 [s; MET]
Trigger Stop: 304277142.848 [s; MET]
UTC: 2010-08-23T17:25:35.715620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.7032249785858 Dec: 5.8420131400694 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.5
Image Trigger?: NO
Rate S/N Ratio: 15.8429795177549 [ if not an image trigger ]
Image S/N Ratio: 10.5
Flight Position: [ source = BAT ]
RA: 20.7032249785858 Dec: 5.8420131400694 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.705962288939 Dec: 5.84790144450991 [deg; J2000]
{ 01h 22m 49.4s , +05d 50' 52.4" }
+/- 1.41094177977968 [arcmin] (estimated 90% radius based on SNR)
+/- 0.484835643924072 [arcmin] (formal 1-sigma fit error)
SNR: 18.6009001071841
Angular difference between Flight and Ground position is 0.389248 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 16.8759999871254 +/- 3.4558356039705
Measured from: -0.455999910831451
to: 16.4200000762939 [s; relative to TRIGTIME]
T50: 7.57599991559982 +/- 1.58959115407011
Measured from: 1.1560001373291
to: 8.73200005292892 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.139999985694885
to: 1.13999998569489 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.17199999094009
to: 18.2120000123978 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.352807 0.298355 0.134184 0.041729
0.022969 0.023528 0.020477 0.018015 [error]
Peak 0.048341 0.041198 0.017799 0.009068
0.005579 0.005689 0.004873 0.003980 [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 1.07e-07 1.29e-07 1.13e-07 1.69e-07 4.08e-07 5.17e-07 erg/cm2
Error 1.25e-08 1.14e-08 1.89e-08 5.49e-08 4.27e-08 7.75e-08 erg/cm2
Peak flux Power-law 4.60e-01 3.21e-01 1.47e-01 9.39e-02 9.74e-01 1.02e+00 ph/cm2/s
Error 8.13e-02 4.55e-02 3.96e-02 4.67e-02 1.32e-01 1.43e-01 ph/cm2/s
Fluence Cutoff-PL 1.05e-07 1.34e-07 1.08e-07 8.60e-08 3.91e-07 4.33e-07 erg/cm2
Error 1.33e-08 1.52e-08 2.28e-08 9.68e-08 5.16e-08 1.21e-07 erg/cm2
Peak flux Cutoff-PL 4.60e-01 3.21e-01 1.47e-01 9.32e-02 9.73e-01 1.02e+00 ph/cm2/s
Error 8.13e-02 4.56e-02 3.96e-02 1.43e-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 2.195 0.175 - - 2.24e-03 2.70e-04 52.900 57
CPL 1.892 0.000 13.6 0.0 3.43e-03 0.00e+00 52.260 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 2.127 0.278 - - 6.11e-03 1.24e-03 60.780 57
CPL 1.994 0.000 2.0 0.0 7.23e-03 0.00e+00 60.930 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: 7.296000 sec.
T50 in the 50-300 keV band: 4.672000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.384 -1.172 18.212
T90 16.876 -0.456 16.420
T50 7.576 1.156 8.732
Peak 1.000 0.140 1.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.7060 +5.8479 0.0103 24.0 -174.6 0.6448 18.6 TRIG_00432420
------------------------------------------
Foreground time interval of the image:
-1.172 10.077 (delta_t = 11.249 [sec])
Background time interval of the image:
-239.824 -1.172 (delta_t = 238.652 [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 -1.172 sec. to 18.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19543 ( -0.170765 0.179873 )
Norm@50keV : 2.24030E-03 ( -0.000272888 0.000268079 )
------------------------------------------------------------
# Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9280 for 57 degrees of freedom
# Null hypothesis probability = 6.296358e-01
Photon flux (15-150 keV) in 19.38 sec: 0.370001 ( -0.0313435 0.0313474 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07951e-07 ( -4.22488e-08 4.32252e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.172 sec. to 18.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89182 ( )
Epeak [keV] : 13.6360 ( )
Norm@50keV : 3.43128E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.26 using 59 PHA bins.
# Reduced chi-squared = 0.9333 for 56 degrees of freedom
# Null hypothesis probability = 6.170919e-01
Photon flux (15-150 keV) in 19.38 sec: 0.364869 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91424e-07 ( -5.23841e-08 5.07717e-08 ) ergs/cm2
Band function
Time interval is from -1.172 sec. to 18.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10365 ( 1.93673 0.111247 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 0.100210 ( )
Norm@50keV : 1.09197E-19 ( )
------------------------------------------------------------
# Chi-Squared = 225.04 using 59 PHA bins.
# Reduced chi-squared = 4.0916 for 55 degrees of freedom
# Null hypothesis probability = 1.936485e-22
Photon flux (15-150 keV) in 19.38 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 0.140 sec. to 1.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12670 ( -0.262741 0.292533 )
Norm@50keV : 6.10742E-03 ( -0.00126261 0.0012176 )
------------------------------------------------------------
# Chi-Squared = 60.78 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 57 degrees of freedom
# Null hypothesis probability = 3.412975e-01
Photon flux (15-150 keV) in 1 sec: 0.973713 ( -0.131618 0.131654 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68997e-08 ( -1.0136e-08 1.05177e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99440 ( )
Epeak [keV] : 1.95317 ( )
Norm@50keV : 7.22558E-03 ( )
------------------------------------------------------------
# Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.030244e-01
Photon flux (15-150 keV) in 1 sec: 0.973407 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68944e-08 ( -1.01363e-08 1.05178e-08 ) ergs/cm2
Band function
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.80795 ( -11.9111 -11.9111 )
beta : -2.23867 ( -0.476572 0.378522 )
Epeak [keV] : 19.6314 ( -19.6314 5.02258 )
Norm@50keV : 3925.44 ( -3925.45 95591.3 )
------------------------------------------------------------
# Chi-Squared = 60.19 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.935602e-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:
Tue Aug 24 00:53:52 EDT 2010