batgrbproduct Analysis for Trigger=450884
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 Apr 8 02:37:24 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger450884/GCN5_download_cron
======================================================================
Trigger: 00450884 Segment: 000
BAT Trigger Time: 323878008 [s; MET]
Trigger Stop: 323878072 [s; MET]
UTC: 2011-04-07T14:06:41.167860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 185.996625275413 Dec: 15.7178020980355 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.72
Flight Position: [ source = BAT ]
RA: 185.996625275413 Dec: 15.7178020980355 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.021858879665 Dec: 15.7258826001533 [deg; J2000]
{ 12h 24m 05.2s , +15d 43' 33.2" }
+/- 1.47035882888295 [arcmin] (estimated 90% radius based on SNR)
+/- 0.578668665040928 [arcmin] (formal 1-sigma fit error)
SNR: 17.5364705025106
Angular difference between Flight and Ground position is 1.535904 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 145.487999975681 +/- 13.1313945400149
Measured from: 2.20400011539459
to: 147.692000091076 [s; relative to TRIGTIME]
T50: 64.7959999442101 +/- 10.9289459375546
Measured from: 25.608000099659
to: 90.404000043869 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 27.6399999856949
to: 28.6399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.89999997615814
to: 158.811999976635 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.948471 1.309833 0.738641 0.122804
0.070649 0.072472 0.064229 0.057136 [error]
Peak 0.016267 0.019547 0.022795 0.011504
0.005872 0.006215 0.005445 0.004634 [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 3.15e-07 5.04e-07 6.10e-07 1.44e-06 1.84e-06 2.87e-06 erg/cm2
Error 3.38e-08 3.44e-08 6.25e-08 3.06e-07 1.46e-07 3.63e-07 erg/cm2
Peak flux Power-law 1.22e-01 1.61e-01 1.55e-01 2.65e-01 5.25e-01 7.02e-01 ph/cm2/s
Error 6.78e-02 5.33e-02 4.45e-02 1.81e-01 1.40e-01 2.01e-01 ph/cm2/s
Fluence Cutoff-PL 2.75e-07 5.57e-07 6.08e-07 3.70e-07 1.68e-06 1.81e-06 erg/cm2
Error 4.07e-08 4.67e-08 7.22e-08 2.95e-07 1.69e-07 3.38e-07 erg/cm2
Peak flux Cutoff-PL 1.22e-01 1.61e-01 1.55e-01 2.63e-01 5.25e-01 7.00e-01 ph/cm2/s
Error 6.78e-02 5.33e-02 4.45e-02 2.00e-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 1.725 0.124 - - 1.24e-03 9.33e-05 55.260 57
CPL 0.736 0.635 58.1 15.2 4.21e-03 4.88e-03 46.250 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 1.055 0.507 - - 4.55e-03 1.18e-03 58.650 57
CPL 1.066 0.542 9999.4 0.0 4.58e-03 6.86e-03 58.660 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: 148.800000 sec.
T50 in the 50-300 keV band: 50.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 161.712 -2.900 158.812
T90 145.488 2.204 147.692
T50 64.796 25.608 90.404
Peak 1.000 27.640 28.640
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
186.0219 +15.7259 0.0109 20.0 135.4 1.9391 17.5 TRIG_00450884
------------------------------------------
Foreground time interval of the image:
-2.900 72.001 (delta_t = 74.901 [sec])
Background time interval of the image:
-239.000 -2.900 (delta_t = 236.100 [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
-2.900000 102.290000
103.000000 158.812000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72514 ( -0.122397 0.125009 )
Norm@50keV : 1.23822E-03 ( -9.37412e-05 9.28609e-05 )
------------------------------------------------------------
# Chi-Squared = 55.26 using 59 PHA bins.
# Reduced chi-squared = 0.9694 for 57 degrees of freedom
# Null hypothesis probability = 5.406941e-01
Photon flux (15-150 keV) in 161 sec: 0.165921 ( -0.0113896 0.0113991 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84237e-06 ( -1.45302e-07 1.47022e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-2.900000 102.290000
103.000000 158.812000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.736446 ( -0.683521 0.586638 )
Epeak [keV] : 58.0507 ( -8.65462 21.7969 )
Norm@50keV : 4.20862E-03 ( -0.00420868 0.0055521 )
------------------------------------------------------------
# Chi-Squared = 46.25 using 59 PHA bins.
# Reduced chi-squared = 0.8258 for 56 degrees of freedom
# Null hypothesis probability = 8.205095e-01
Photon flux (15-150 keV) in 161 sec: 0.157729 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67585e-06 ( -1.65598e-07 1.72061e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-2.900000 102.290000
103.000000 158.812000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.706064 ( -0.596383 1.18121 )
beta : -2.65271 ( 2.65332 0.710135 )
Epeak [keV] : 56.8070 ( -14.7388 21.4876 )
Norm@50keV : 4.42089E-03 ( -0.00446954 0.0187128 )
------------------------------------------------------------
# Chi-Squared = 46.04 using 59 PHA bins.
# Reduced chi-squared = 0.8371 for 55 degrees of freedom
# Null hypothesis probability = 7.998952e-01
Photon flux (15-150 keV) in 161 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 27.640 sec. to 28.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05525 ( -0.534121 0.480721 )
Norm@50keV : 4.54528E-03 ( -0.0011855 0.00117198 )
------------------------------------------------------------
# Chi-Squared = 58.65 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.146694e-01
Photon flux (15-150 keV) in 1 sec: 0.525202 ( -0.139702 0.140188 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82213e-08 ( -1.35974e-08 1.37975e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.640 sec. to 28.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06634 ( -0.615215 0.469333 )
Epeak [keV] : 9999.36 ( -9999.55 -9999.55 )
Norm@50keV : 4.57507E-03 ( -0.00117029 0.0125464 )
------------------------------------------------------------
# Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.781057e-01
Photon flux (15-150 keV) in 1 sec: 0.524980 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82283e-08 ( -1.35981e-08 1.38106e-08 ) ergs/cm2
Band function
Time interval is from 27.640 sec. to 28.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -412244 -412244 )
beta : -1.06432 ( -0.567602 0.541871 )
Epeak [keV] : 23.0800 ( -24.8269 17.4582 )
Norm@50keV : 512.201 ( -501.032 867062 )
------------------------------------------------------------
# Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.468542e-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:
Fri Apr 8 02:56:21 EDT 2011