batgrbproduct Analysis for Trigger=450161
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 Mar 29 04:50:59 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger450161/GCN5_download_cron
======================================================================
Trigger: 00450161 Segment: 000
BAT Trigger Time: 323012448 [s; MET]
Trigger Stop: 323012512 [s; MET]
UTC: 2011-03-28T13:40:41.200500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.202695413514 Dec: 57.5802279948333 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.57
Flight Position: [ source = BAT ]
RA: 251.202695413514 Dec: 57.5802279948333 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.276393727544 Dec: 57.6133727432547 [deg; J2000]
{ 16h 45m 06.3s , +57d 36' 48.1" }
+/- 2.72156718031058 [arcmin] (estimated 90% radius based on SNR)
+/- 1.45941756305707 [arcmin] (formal 1-sigma fit error)
SNR: 7.27693164702849
Angular difference between Flight and Ground position is 3.093506 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/- 22.6274169979695
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/- 16
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.197938 0.171948 0.203443 0.041361
0.039743 0.041631 0.038814 0.037537 [error]
Peak 0.197938 0.171948 0.203443 0.041361
0.039743 0.041631 0.038814 0.037537 [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 4.18e-08 8.64e-08 1.39e-07 5.04e-07 3.86e-07 7.72e-07 erg/cm2
Error 1.44e-08 1.82e-08 3.67e-08 2.95e-07 9.08e-08 3.22e-07 erg/cm2
Peak flux Power-law 2.10e-02 2.36e-02 1.91e-02 2.56e-02 7.31e-02 8.93e-02 ph/cm2/s
Error 7.37e-03 5.10e-03 4.86e-03 1.38e-02 1.46e-02 1.93e-02 ph/cm2/s
Fluence Cutoff-PL 3.83e-08 8.98e-08 1.45e-07 2.77e-07 3.75e-07 5.52e-07 erg/cm2
Error 1.77e-08 2.11e-08 4.10e-08 4.12e-07 9.57e-08 4.02e-07 erg/cm2
Peak flux Cutoff-PL 1.91e-02 2.44e-02 1.99e-02 1.62e-02 7.16e-02 7.96e-02 ph/cm2/s
Error 9.08e-03 5.77e-03 5.58e-03 2.45e-02 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 8.12e-02 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 1.309 0.358 - - 6.12e-04 1.24e-04 33.890 57
CPL 0.828 1.630 129.2 0.0 1.04e-03 0.00e+00 33.560 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 1.309 0.358 - - 6.12e-04 1.24e-04 33.890 57
CPL 0.828 1.630 129.2 0.0 1.04e-03 0.00e+00 33.560 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.2764 +57.6134 0.0264 0.0 -109.1 0.5877 7.3 TRIG_00450161
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30923 ( -0.355544 0.360126 )
Norm@50keV : 6.11772E-04 ( -0.000125027 0.00012383 )
------------------------------------------------------------
# Chi-Squared = 33.89 using 59 PHA bins.
# Reduced chi-squared = 0.5946 for 57 degrees of freedom
# Null hypothesis probability = 9.936085e-01
Photon flux (15-150 keV) in 64 sec: 7.31117E-02 ( -0.0146124 0.0146295 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8604e-07 ( -8.95731e-08 9.19578e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.828373 ( -1.65555 1.60353 )
Epeak [keV] : 129.157 ( -129.388 -129.388 )
Norm@50keV : 1.04047E-03 ( )
------------------------------------------------------------
# Chi-Squared = 33.56 using 59 PHA bins.
# Reduced chi-squared = 0.5993 for 56 degrees of freedom
# Null hypothesis probability = 9.924780e-01
Photon flux (15-150 keV) in 64 sec: 7.16462E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7535e-07 ( -9.4217e-08 9.70957e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38547 ( 0.890765 1.64981 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 4.40860 ( -4.4086 -4.4086 )
Norm@50keV : 3.67135E-20 ( -3.67135e-20 7.7715e-21 )
------------------------------------------------------------
# Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7659 for 55 degrees of freedom
# Null hypothesis probability = 8.987252e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30923 ( -0.355544 0.360126 )
Norm@50keV : 6.11772E-04 ( -0.000125027 0.00012383 )
------------------------------------------------------------
# Chi-Squared = 33.89 using 59 PHA bins.
# Reduced chi-squared = 0.5946 for 57 degrees of freedom
# Null hypothesis probability = 9.936085e-01
Photon flux (15-150 keV) in 64 sec: 7.31117E-02 ( -0.0146124 0.0146295 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8604e-07 ( -8.95731e-08 9.19578e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.828373 ( -1.65555 1.60374 )
Epeak [keV] : 129.157 ( -129.388 -129.388 )
Norm@50keV : 1.04047E-03 ( )
------------------------------------------------------------
# Chi-Squared = 33.56 using 59 PHA bins.
# Reduced chi-squared = 0.5993 for 56 degrees of freedom
# Null hypothesis probability = 9.924780e-01
Photon flux (15-150 keV) in 64 sec: 7.16462E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7535e-07 ( -9.4217e-08 9.70368e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38547 ( 0.890765 1.64981 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 4.40860 ( -4.4086 -4.4086 )
Norm@50keV : 3.67135E-20 ( -3.67135e-20 7.7715e-21 )
------------------------------------------------------------
# Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7659 for 55 degrees of freedom
# Null hypothesis probability = 8.987252e-01
Photon flux (15-150 keV) in 64 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 Mar 29 05:06:41 EDT 2011