batgrbproduct Analysis for Trigger=450610
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): Mon Apr 4 09:16:40 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger450610/GCN5_download_cron
======================================================================
Trigger: 00450610 Segment: 000
BAT Trigger Time: 323491096 [s; MET]
Trigger Stop: 323491160 [s; MET]
UTC: 2011-04-03T02:38:09.182460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 176.933978402834 Dec: -61.9453606209619 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.18
Flight Position: [ source = BAT ]
RA: 176.933978402834 Dec: -61.9453606209619 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 176.881393408298 Dec: -61.9459853118554 [deg; J2000]
{ 11h 47m 31.5s , -61d 56' 45.5" }
+/- 3.36072343495422 [arcmin] (estimated 90% radius based on SNR)
+/- 1.59103596788571 [arcmin] (formal 1-sigma fit error)
SNR: 5.38358481400849
Angular difference between Flight and Ground position is 1.484344 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
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 0.314927 0.175936 -0.023734 0.008530
0.045534 0.045315 0.039332 0.035114 [error]
Peak 0.314927 0.175936 -0.023734 0.008530
0.045534 0.045315 0.039332 0.035114 [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 8.46e-08 5.98e-08 2.79e-08 1.83e-08 1.81e-07 1.91e-07 erg/cm2
Error 1.96e-08 2.11e-08 1.95e-08 2.59e-08 5.63e-08 6.82e-08 erg/cm2
Peak flux Power-law 4.41e-02 1.76e-02 4.10e-03 1.16e-03 6.65e-02 6.70e-02 ph/cm2/s
Error 1.03e-02 5.91e-03 3.67e-03 1.55e-03 1.56e-02 1.59e-02 ph/cm2/s
Fluence Cutoff-PL 9.28e-08 6.42e-08 1.62e-09 8.58e-14 1.59e-07 1.59e-07 erg/cm2
Error 2.28e-08 3.08e-08 9.99e-09 5.54e-10 4.13e-08 4.13e-08 erg/cm2
Peak flux Cutoff-PL 4.41e-02 1.76e-02 4.10e-03 1.15e-03 6.65e-02 6.69e-02 ph/cm2/s
Error 1.03e-02 5.92e-03 3.67e-03 1.59e-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 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 3.046 0.589 - - 2.35e-04 1.78e-04 68.320 57
CPL 1.000 0.000 50.0 0.0 1.27e-03 0.00e+00 87.150 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 3.046 0.589 - - 2.35e-04 1.78e-04 68.320 57
CPL 1.000 0.000 50.0 0.0 1.27e-03 0.00e+00 87.150 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
176.8814 -61.9460 0.0359 14.7 113.6 0.4666 5.4 TRIG_00450610
------------------------------------------
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: 3.04644 ( -0.47068 0.706811 )
Norm@50keV : 2.35235E-04 ( -0.000232781 0.000122362 )
------------------------------------------------------------
# Chi-Squared = 68.32 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.449148e-01
Photon flux (15-150 keV) in 64 sec: 6.64891E-02 ( -0.0155482 0.0157335 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81135e-07 ( -5.2802e-08 5.98946e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.26764E-03 ( )
------------------------------------------------------------
# Chi-Squared = 87.15 using 59 PHA bins.
# Reduced chi-squared = 1.556 for 56 degrees of freedom
# Null hypothesis probability = 4.844930e-03
Photon flux (15-150 keV) in 64 sec: 6.64701E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58714e-07 ( -3.88499e-08 4.37901e-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 : 4.03225 ( -3.19692 -2.33591 )
beta : -9.37167 ( 9.99998 19.9942 )
Epeak [keV] : 21.7112 ( -5.43553 4.25782 )
Norm@50keV : 49.6726 ( -49.6726 200.245 )
------------------------------------------------------------
# Chi-Squared = 62.30 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.325959e-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: 3.04644 ( -0.47068 0.706811 )
Norm@50keV : 2.35235E-04 ( -0.000232781 0.000122362 )
------------------------------------------------------------
# Chi-Squared = 68.32 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.449148e-01
Photon flux (15-150 keV) in 64 sec: 6.64891E-02 ( -0.0155482 0.0157335 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81135e-07 ( -5.2802e-08 5.98946e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.26764E-03 ( )
------------------------------------------------------------
# Chi-Squared = 87.15 using 59 PHA bins.
# Reduced chi-squared = 1.556 for 56 degrees of freedom
# Null hypothesis probability = 4.844930e-03
Photon flux (15-150 keV) in 64 sec: 6.64701E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58714e-07 ( -3.88499e-08 4.37901e-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 : 3.10728 ( -4.31372 -2.67804 )
beta : -9.35110 ( 9.96367 19.9535 )
Epeak [keV] : 21.4842 ( -4.73391 3.77841 )
Norm@50keV : 9.35804 ( -10.7478 122.506 )
------------------------------------------------------------
# Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.327315e-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:
Mon Apr 4 09:38:40 EDT 2011