batgrbproduct Analysis for Trigger=454473
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 May 31 00:49:25 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger454473/GCN5_download_cron
======================================================================
Trigger: 00454473 Segment: 000
BAT Trigger Time: 328462269.696 [s; MET]
Trigger Stop: 328462277.888 [s; MET]
UTC: 2011-05-30T15:31:02.689700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.044970301811 Dec: 61.9318358067532 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.75
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 9.75
Flight Position: [ source = BAT ]
RA: 282.044970301811 Dec: 61.9318358067532 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.028526251226 Dec: 61.9300887372395 [deg; J2000]
{ 18h 48m 06.8s , +61d 55' 48.3" }
+/- 1.89467226907284 [arcmin] (estimated 90% radius based on SNR)
+/- 0.787311994863264 [arcmin] (formal 1-sigma fit error)
SNR: 12.2079037377723
Angular difference between Flight and Ground position is 0.475937 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 54.2400000691414 +/- 15.5237624408228
Measured from: -42.7359998822212
to: 11.5040001869202 [s; relative to TRIGTIME]
T50: 26.4800000786781 +/- 13.7535333391844
Measured from: -19.6799998879433
to: 6.80000019073486 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.02799999713898
to: 2.02799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -47.5839999914169
to: 17.3920000195503 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.323111 0.375873 0.208442 0.074194
0.042934 0.044289 0.039531 0.035519 [error]
Peak 0.014951 0.017703 0.020066 0.002287
0.005711 0.005595 0.005023 0.004438 [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 9.59e-08 1.44e-07 1.61e-07 3.43e-07 5.05e-07 7.45e-07 erg/cm2
Error 1.90e-08 1.95e-08 3.86e-08 1.67e-07 8.77e-08 2.07e-07 erg/cm2
Peak flux Power-law 1.18e-01 1.39e-01 1.18e-01 1.69e-01 4.35e-01 5.44e-01 ph/cm2/s
Error 6.72e-02 4.69e-02 4.10e-02 1.36e-01 1.27e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 9.60e-08 1.44e-07 1.61e-07 3.40e-07 5.05e-07 7.42e-07 erg/cm2
Error 1.90e-08 2.04e-08 3.86e-08 2.65e-07 8.96e-08 2.54e-07 erg/cm2
Peak flux Cutoff-PL 1.18e-01 1.39e-01 1.18e-01 1.68e-01 4.35e-01 5.41e-01 ph/cm2/s
Error 7.06e-02 3.55e-02 4.30e-02 1.69e-01 1.28e-01 1.67e-01 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 1.834 0.268 - - 8.44e-04 1.44e-04 58.980 57
CPL 2.073 0.000 30.4 0.0 6.23e-04 0.00e+00 58.600 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 1.237 0.569 - - 3.69e-03 1.05e-03 49.790 57
CPL 1.248 0.574 9999.4 0.0 3.69e-03 8.50e-03 49.790 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 64.976 -47.584 17.392
T90 54.240 -42.736 11.504
T50 26.480 -19.680 6.800
Peak 1.000 1.028 2.028
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.0285 +61.9301 0.0157 16.0 -38.4 1.0921 12.2 TRIG_00454473
------------------------------------------
Foreground time interval of the image:
-47.584 17.392 (delta_t = 64.976 [sec])
Background time interval of the image:
-235.195 -47.584 (delta_t = 187.611 [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 -47.584 sec. to 17.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83375 ( -0.260388 0.276415 )
Norm@50keV : 8.44479E-04 ( -0.00014706 0.000141655 )
------------------------------------------------------------
# Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.030099e-01
Photon flux (15-150 keV) in 64.98 sec: 0.117925 ( -0.0158514 0.0158514 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0469e-07 ( -8.62174e-08 8.92344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -47.584 sec. to 17.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07267 ( )
Epeak [keV] : 30.4239 ( )
Norm@50keV : 6.23010E-04 ( )
------------------------------------------------------------
# Chi-Squared = 58.60 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.802151e-01
Photon flux (15-150 keV) in 64.98 sec: 0.117882 ( -0.015845 0.015846 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04555e-07 ( -8.99895e-08 8.92169e-08 ) ergs/cm2
Band function
Time interval is from -47.584 sec. to 17.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85259 ( -14.9301 -14.9301 )
beta : -1.86714 ( -0.311449 0.27803 )
Epeak [keV] : 18.6756 ( -18.6737 7.26098 )
Norm@50keV : 596.138 ( -596.64 151.899 )
------------------------------------------------------------
# Chi-Squared = 58.75 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 3.397409e-01
Photon flux (15-150 keV) in 64.98 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 1.028 sec. to 2.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23727 ( -0.576513 0.562407 )
Norm@50keV : 3.68661E-03 ( -0.0010509 0.00104901 )
------------------------------------------------------------
# Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.8734 for 57 degrees of freedom
# Null hypothesis probability = 7.399865e-01
Photon flux (15-150 keV) in 1 sec: 0.435147 ( -0.126995 0.12753 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.70202e-08 ( -1.19221e-08 1.22287e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.028 sec. to 2.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24788 ( -0.592234 0.555391 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 3.68832E-03 ( -0.00105633 0.0159506 )
------------------------------------------------------------
# Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.8891 for 56 degrees of freedom
# Null hypothesis probability = 7.075537e-01
Photon flux (15-150 keV) in 1 sec: 0.435017 ( -0.127634 0.127417 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64393e-08 ( -1.14122e-08 1.27795e-08 ) ergs/cm2
Band function
Time interval is from 1.028 sec. to 2.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.22982 ( 3.28998 3.05162 )
beta : -1.23724 ( -0.562481 0.576834 )
Epeak [keV] : 224.048 ( -224.048 -224.048 )
Norm@50keV : 0.501063 ( -0.142868 0.14258 )
------------------------------------------------------------
# Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.9052 for 55 degrees of freedom
# Null hypothesis probability = 6.735195e-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:
Tue May 31 01:13:03 EDT 2011