batgrbproduct Analysis for Trigger=456532
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): Sat Jul 2 23:40:00 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger456532/GCN5_download_cron
======================================================================
Trigger: 00456532 Segment: 000
BAT Trigger Time: 331343277.248 [s; MET]
Trigger Stop: 331343281.344 [s; MET]
UTC: 2011-07-02T23:47:50.130960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 318.634419949126 Dec: -46.7454828400775 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.74
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 6.74
Flight Position: [ source = BAT ]
RA: 318.634419949126 Dec: -46.7454828400775 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 318.371042127372 Dec: -46.7436167909133 [deg; J2000]
{ 21h 13m 29.1s , -46d 44' 37.0" }
+/- 5.15669636567219 [arcmin] (estimated 90% radius based on SNR)
+/- 4.00700492155703 [arcmin] (formal 1-sigma fit error)
SNR: 2.92041602281882
Angular difference between Flight and Ground position is 10.829389 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 4.09599995613098 +/-
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
T50: 4.09599995613098 +/-
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09599995613098 second)
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.057277 0.001515 0.004065 -0.012850
0.011672 0.011476 0.010185 0.009302 [error]
Peak 0.057277 0.001515 0.004065 -0.012850
0.011672 0.011476 0.010185 0.009302 [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 1.11e-08 6.82e-09 2.67e-09 1.40e-09 2.13e-08 2.23e-08 erg/cm2
Error 4.66e-09 4.83e-09 4.16e-09 5.10e-09 1.27e-08 1.52e-08 erg/cm2
Peak flux Power-law 9.10e-02 3.16e-02 6.19e-03 1.43e-03 1.30e-01 1.31e-01 ph/cm2/s
Error 3.82e-02 2.14e-02 9.31e-03 4.65e-03 5.68e-02 5.76e-02 ph/cm2/s
Fluence Cutoff-PL 1.52e-08 4.96e-09 2.59e-12 1.26e-21 2.02e-08 2.02e-08 erg/cm2
Error 5.50e-09 4.98e-09 1.11e-10 0.00e+00 7.56e-09 7.56e-09 erg/cm2
Peak flux Cutoff-PL 1.20e-01 2.63e-02 7.46e-06 1.85e-15 1.46e-01 1.46e-01 ph/cm2/s
Error 4.42e-02 1.63e-02 3.03e-04 0.00e+00 5.19e-02 5.19e-02 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 3.339 1.233 - - 3.65e-04 4.29e-04 55.760 57
CPL 1.000 0.000 50.0 0.0 2.37e-03 0.00e+00 63.190 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 3.339 1.233 - - 3.65e-04 4.29e-04 55.760 57
CPL 1.000 0.000 50.0 0.0 2.37e-03 0.00e+00 63.190 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
318.3710 -46.7436 0.0662 11.9 137.2 0.0623 2.9 TRIG_00456532
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-239.248 -13.248 (delta_t = 226.000 [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 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.33909 ( -1.0046 1.46113 )
Norm@50keV : 3.65383E-04 ( -0.000363465 0.000494766 )
------------------------------------------------------------
# Chi-Squared = 55.76 using 59 PHA bins.
# Reduced chi-squared = 0.9783 for 57 degrees of freedom
# Null hypothesis probability = 5.216728e-01
Photon flux (15-150 keV) in 4.096 sec: 0.129748 ( -0.0542454 0.0593377 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13289e-08 ( -1.08759e-08 1.44799e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.36607E-03 ( )
------------------------------------------------------------
# Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 56 degrees of freedom
# Null hypothesis probability = 2.373031e-01
Photon flux (15-150 keV) in 4.096 sec: 0.146318 ( -0.0519117 0.051963 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01973e-08 ( -7.4242e-09 7.69798e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.36460 ( 1.50799 1.50799 )
beta : -9.99989 ( 30225.3 30235.3 )
Epeak [keV] : 19.1246 ( -9.38417 4.52969 )
Norm@50keV : 476.418 ( -498.309 183.08 )
------------------------------------------------------------
# Chi-Squared = 51.17 using 59 PHA bins.
# Reduced chi-squared = 0.9303 for 55 degrees of freedom
# Null hypothesis probability = 6.217591e-01
Photon flux (15-150 keV) in 4.096 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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.33909 ( -1.0046 1.46113 )
Norm@50keV : 3.65383E-04 ( -0.000363465 0.000494766 )
------------------------------------------------------------
# Chi-Squared = 55.76 using 59 PHA bins.
# Reduced chi-squared = 0.9783 for 57 degrees of freedom
# Null hypothesis probability = 5.216728e-01
Photon flux (15-150 keV) in 4.096 sec: 0.129748 ( -0.0542454 0.0593377 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13289e-08 ( -1.08759e-08 1.44799e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.36607E-03 ( )
------------------------------------------------------------
# Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 56 degrees of freedom
# Null hypothesis probability = 2.373031e-01
Photon flux (15-150 keV) in 4.096 sec: 0.146318 ( -0.0519117 0.051963 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01973e-08 ( -7.4242e-09 7.69798e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.36460 ( 1.50799 1.50799 )
beta : -9.99989 ( 30225.3 30235.3 )
Epeak [keV] : 19.1246 ( -9.45487 4.52816 )
Norm@50keV : 476.418 ( -498.309 183.08 )
------------------------------------------------------------
# Chi-Squared = 51.17 using 59 PHA bins.
# Reduced chi-squared = 0.9303 for 55 degrees of freedom
# Null hypothesis probability = 6.217591e-01
Photon flux (15-150 keV) in 4.096 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:
Sat Jul 2 23:52:33 EDT 2011