batgrbproduct Analysis for Trigger=438675
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): Thu Nov 18 06:34:38 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger438675/GCN5_download_cron
======================================================================
Trigger: 00438675 Segment: 000
BAT Trigger Time: 311714010.304 [s; MET]
Trigger Stop: 311714010.56 [s; MET]
UTC: 2010-11-17T19:13:23.925160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 172.909464171776 Dec: -72.6617234768991 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.66
Image Trigger?: NO
Rate S/N Ratio: 16.3707055437449 [ if not an image trigger ]
Image S/N Ratio: 7.66
Flight Position: [ source = BAT ]
RA: 172.909464171776 Dec: -72.6617234768991 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 172.990481731077 Dec: -72.6513455403874 [deg; J2000]
{ 11h 31m 57.7s , -72d 39' 04.8" }
+/- 1.02697610047027 [arcmin] (estimated 90% radius based on SNR)
+/- 0.394943466807623 [arcmin] (formal 1-sigma fit error)
SNR: 29.282193957228
Angular difference between Flight and Ground position is 1.577195 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 5.31199997663498 +/- 1.8022563626477
Measured from: 0.120000123977661
to: 5.43200010061264 [s; relative to TRIGTIME]
T50: 1.85600000619888 +/- 0.202385803424389
Measured from: 0.952000081539154
to: 2.80800008773804 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.740000009536743
to: 1.74000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.200000047683716
to: 8.567999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.479020 0.611820 0.525041 0.112770
0.027493 0.029684 0.026449 0.021308 [error]
Peak 0.136703 0.194761 0.173135 0.038635
0.011086 0.012292 0.011368 0.007786 [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 1.49e-07 2.74e-07 3.86e-07 1.14e-06 1.11e-06 1.95e-06 erg/cm2
Error 1.39e-08 1.52e-08 2.60e-08 1.68e-07 6.31e-08 1.87e-07 erg/cm2
Peak flux Power-law 1.43e+00 1.47e+00 1.07e+00 1.24e+00 4.45e+00 5.21e+00 ph/cm2/s
Error 1.51e-01 9.94e-02 8.96e-02 2.06e-01 2.89e-01 3.49e-01 ph/cm2/s
Fluence Cutoff-PL 1.40e-07 2.82e-07 3.97e-07 7.20e-07 1.08e-06 1.54e-06 erg/cm2
Error 1.71e-08 1.76e-08 2.89e-08 2.70e-07 6.80e-08 3.61e-07 erg/cm2
Peak flux Cutoff-PL 1.35e+00 1.53e+00 1.11e+00 8.42e-01 4.41e+00 4.83e+00 ph/cm2/s
Error 1.77e-01 9.14e-02 1.03e-01 4.73e-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 4.80e+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 1.503 0.093 - - 1.33e-02 6.97e-04 39.140 57
CPL 1.167 0.374 130.1 -43.2 1.93e-02 8.14e-03 36.550 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 1.466 0.107 - - 3.60e-02 2.42e-03 60.320 57
CPL 1.119 0.410 129.1 -41.5 5.40e-02 2.66e-02 58.100 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: 3.520000 sec.
T50 in the 50-300 keV band: 1.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.768 -0.200 8.568
T90 5.312 0.120 5.432
T50 1.856 0.952 2.808
Peak 1.000 0.740 1.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
172.9905 -72.6513 0.0066 31.5 -112.2 1.8151 29.3 TRIG_00438675
------------------------------------------
Foreground time interval of the image:
-0.200 8.297 (delta_t = 8.497 [sec])
Background time interval of the image:
-239.304 -0.200 (delta_t = 239.104 [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 -0.200 sec. to 8.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50293 ( -0.0923811 0.0928849 )
Norm@50keV : 1.32918E-02 ( -0.00069807 0.000696075 )
------------------------------------------------------------
# Chi-Squared = 39.14 using 59 PHA bins.
# Reduced chi-squared = 0.6866 for 57 degrees of freedom
# Null hypothesis probability = 9.659743e-01
Photon flux (15-150 keV) in 8.768 sec: 1.66065 ( -0.0893106 0.0894638 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10505e-06 ( -6.29242e-08 6.31857e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 8.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16691 ( -0.387458 0.360294 )
Epeak [keV] : 130.090 ( -43.6447 -130.09 )
Norm@50keV : 1.93228E-02 ( -0.00622888 0.010049 )
------------------------------------------------------------
# Chi-Squared = 36.55 using 59 PHA bins.
# Reduced chi-squared = 0.6527 for 56 degrees of freedom
# Null hypothesis probability = 9.794607e-01
Photon flux (15-150 keV) in 8.768 sec: 1.63069 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08179e-06 ( -6.82764e-08 6.77766e-08 ) ergs/cm2
Band function
Time interval is from -0.200 sec. to 8.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16709 ( -0.322718 0.377643 )
beta : -10.00000 ( 3.15472e+14 3.15472e+14 )
Epeak [keV] : 130.120 ( -43.6908 -130.119 )
Norm@50keV : 1.93163E-02 ( -0.00622724 0.0100556 )
------------------------------------------------------------
# Chi-Squared = 36.55 using 59 PHA bins.
# Reduced chi-squared = 0.6646 for 55 degrees of freedom
# Null hypothesis probability = 9.738523e-01
Photon flux (15-150 keV) in 8.768 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 0.740 sec. to 1.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46553 ( -0.106644 0.108032 )
Norm@50keV : 3.59986E-02 ( -0.00242149 0.00240975 )
------------------------------------------------------------
# Chi-Squared = 60.32 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.568500e-01
Photon flux (15-150 keV) in 1 sec: 4.45368 ( -0.289121 0.289172 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43515e-07 ( -2.55924e-08 2.57213e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.740 sec. to 1.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11915 ( -0.433479 0.385682 )
Epeak [keV] : 129.103 ( -46.1398 -129.103 )
Norm@50keV : 5.40224E-02 ( -0.0189768 0.0343047 )
------------------------------------------------------------
# Chi-Squared = 58.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.977855e-01
Photon flux (15-150 keV) in 1 sec: 4.41497 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37501e-07 ( -2.6812e-08 2.6603e-08 ) ergs/cm2
Band function
Time interval is from 0.740 sec. to 1.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11935 ( -0.303019 0.495951 )
beta : -10.00000 ( 3.15472e+14 3.15472e+14 )
Epeak [keV] : 129.135 ( -46.202 -129.135 )
Norm@50keV : 5.40030E-02 ( -0.0189678 0.0343265 )
------------------------------------------------------------
# Chi-Squared = 58.10 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.617619e-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 Nov 18 06:50:57 EST 2010