batgrbproduct Analysis for Trigger=341076
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): Fri Jun 3 13:09:09 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger341076/SDC
======================================================================
Trigger: 00341076 Segment: 000
BAT Trigger Time: 254577560 [s; MET]
Trigger Stop: 254577880 [s; MET]
UTC: 2009-01-25T11:59:15.555260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.243681083418 Dec: -61.8833071490815 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.05
Flight Position: [ source = BAT ]
RA: 170.243681083418 Dec: -61.8833071490815 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.209095111983 Dec: -61.875740334234 [deg; J2000]
{ 11h 20m 50.2s , -61d 52' 32.7" }
+/- 2.83675241738381 [arcmin] (estimated 90% radius based on SNR)
+/- 1.61177440757768 [arcmin] (formal 1-sigma fit error)
SNR: 6.85852328877418
Angular difference between Flight and Ground position is 1.078314 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.866179 0.857341 0.112075 -0.079188
0.118713 0.115280 0.099845 0.086776 [error]
Peak 0.866179 0.857341 0.112075 -0.079188
0.118713 0.115280 0.099845 0.086776 [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 3.22e-07 3.11e-07 2.10e-07 2.22e-07 9.33e-07 1.06e-06 erg/cm2
Error 5.93e-08 5.81e-08 7.41e-08 1.43e-07 1.86e-07 2.66e-07 erg/cm2
Peak flux Power-law 3.32e-02 1.79e-02 6.04e-03 2.64e-03 5.86e-02 5.98e-02 ph/cm2/s
Error 6.22e-03 3.24e-03 2.07e-03 1.59e-03 9.39e-03 9.67e-03 ph/cm2/s
Fluence Cutoff-PL 3.09e-07 3.97e-07 7.13e-08 5.87e-10 7.78e-07 7.78e-07 erg/cm2
Error 6.71e-08 8.32e-08 9.19e-08 1.15e-08 1.58e-07 1.58e-07 erg/cm2
Peak flux Cutoff-PL 3.09e-02 2.33e-02 2.34e-03 1.05e-05 5.65e-02 5.65e-02 ph/cm2/s
Error 7.03e-03 4.64e-03 2.80e-03 1.87e-04 9.23e-03 9.23e-03 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 2.567 0.322 - - 2.86e-04 7.60e-05 63.290 57
CPL -1.679 3.619 26.5 6.4 2.30e-01 0.00e+00 53.250 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 2.567 0.322 - - 2.86e-04 7.60e-05 63.290 57
CPL -1.679 3.619 26.5 6.4 2.30e-01 0.00e+00 53.250 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.2091 -61.8757 0.0281 37.1 -167.9 1.7268 6.9 TRIG_00341076
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56709 ( -0.302874 0.341436 )
Norm@50keV : 2.86106E-04 ( -7.53193e-05 7.66029e-05 )
------------------------------------------------------------
# Chi-Squared = 63.29 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.640857e-01
Photon flux (15-150 keV) in 320 sec: 5.85947E-02 ( -0.0093828 0.00938869 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32739e-07 ( -1.81068e-07 1.90393e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67897 ( -5.31456 1.92315 )
Epeak [keV] : 26.5426 ( -7.9746 4.92461 )
Norm@50keV : 0.229845 ( )
------------------------------------------------------------
# Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 56 degrees of freedom
# Null hypothesis probability = 5.795082e-01
Photon flux (15-150 keV) in 320 sec: 5.65230E-02 ( -0.0092452 0.0092179 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78422e-07 ( -1.48675e-07 1.66813e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.37870 ( -3.65493 -2.82381 )
beta : -4.21791 ( 4.20982 1.20347 )
Epeak [keV] : 26.1129 ( -3.71765 3.44166 )
Norm@50keV : 4.24141 ( -3.08829 23.8394 )
------------------------------------------------------------
# Chi-Squared = 52.35 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 55 degrees of freedom
# Null hypothesis probability = 5.766048e-01
Photon flux (15-150 keV) in 320 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 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56709 ( -0.302874 0.341436 )
Norm@50keV : 2.86106E-04 ( -7.53193e-05 7.66029e-05 )
------------------------------------------------------------
# Chi-Squared = 63.29 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.640857e-01
Photon flux (15-150 keV) in 320 sec: 5.85947E-02 ( -0.0093828 0.00938869 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32739e-07 ( -1.81068e-07 1.90393e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67897 ( -5.31456 1.92315 )
Epeak [keV] : 26.5426 ( -7.9746 4.92461 )
Norm@50keV : 0.229845 ( )
------------------------------------------------------------
# Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 56 degrees of freedom
# Null hypothesis probability = 5.795082e-01
Photon flux (15-150 keV) in 320 sec: 5.65230E-02 ( -0.0092452 0.0092179 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78422e-07 ( -1.48675e-07 1.66813e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.37870 ( -3.65493 -2.82381 )
beta : -4.21791 ( 4.20982 1.20347 )
Epeak [keV] : 26.1129 ( -3.71765 3.44166 )
Norm@50keV : 4.24141 ( -3.08829 23.5041 )
------------------------------------------------------------
# Chi-Squared = 52.35 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 55 degrees of freedom
# Null hypothesis probability = 5.766048e-01
Photon flux (15-150 keV) in 320 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:
Fri Jun 3 13:29:39 EDT 2011