batgrbproduct Analysis for Trigger=436241
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): Thu Oct 14 13:37:38 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger436241/GCN5_download_cron
======================================================================
Trigger: 00436241 Segment: 000
BAT Trigger Time: 308690848 [s; MET]
Trigger Stop: 308692048 [s; MET]
UTC: 2010-10-13T19:27:21.731620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.030326569459 Dec: -24.8057853290476 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 267.030326569459 Dec: -24.8057853290476 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.067110044361 Dec: -24.7511253201398 [deg; J2000]
{ 17h 48m 16.1s , -24d 45' 04.1" }
+/- 3.79081312764799 [arcmin] (estimated 90% radius based on SNR)
+/- 2.06808256837533 [arcmin] (formal 1-sigma fit error)
SNR: 4.53270904917811
Angular difference between Flight and Ground position is 3.843316 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 1200 +/-
Measured from: 0
to: 1200 [s; relative to TRIGTIME]
T50: 1200 +/-
Measured from: 0
to: 1200 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1200 second)
Measured from: 0
to: 1200 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1200 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.451097 0.182547 0.074701 0.111486
0.089071 0.078750 0.067584 0.061736 [error]
Peak 0.451097 0.182547 0.074701 0.111486
0.089071 0.078750 0.067584 0.061736 [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 1.24e-07 8.52e-08 3.84e-08 2.41e-08 2.59e-07 2.72e-07 erg/cm2
Error 4.08e-08 6.35e-08 4.63e-08 6.00e-08 1.11e-07 1.41e-07 erg/cm2
Peak flux Power-law 1.82e-02 6.59e-03 1.36e-03 3.35e-04 2.64e-02 2.65e-02 ph/cm2/s
Error 5.31e-03 3.26e-03 1.63e-03 7.59e-04 7.66e-03 7.78e-03 ph/cm2/s
Fluence Cutoff-PL 1.24e-07 8.52e-08 3.84e-08 2.38e-08 2.59e-07 2.71e-07 erg/cm2
Error 4.08e-08 6.36e-08 4.62e-08 5.94e-08 1.11e-07 1.41e-07 erg/cm2
Peak flux Cutoff-PL 1.82e-02 6.59e-03 1.36e-03 3.32e-04 2.64e-02 2.62e-02 ph/cm2/s
Error 5.30e-03 3.26e-03 1.62e-03 7.82e-03 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 3.149 1.029 - - 8.36e-05 7.95e-05 56.740 57
CPL 1.620 0.000 6.3 0.0 1.19e-03 0.00e+00 57.130 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 3.274 1.004 - - 7.82e-05 7.63e-05 57.620 57
CPL 1.000 0.000 50.0 0.0 5.00e-04 0.00e+00 69.620 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 1200.000 0.000 1200.000
T90 1200.000 0.000 1200.000
T50 1200.000 0.000 1200.000
Peak 1200.000 0.000 1200.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.0671 -24.7511 0.0425 15.0 139.0 0.9037 4.5 TRIG_00436241
------------------------------------------
Foreground time interval of the image:
155.000 299.325 (delta_t = 144.325 [sec])
307.000 317.136 (delta_t = 10.135 [sec])
361.000 370.070 (delta_t = 9.070 [sec])
420.000 483.130 (delta_t = 63.130 [sec])
541.000 545.179 (delta_t = 4.179 [sec])
601.000 607.476 (delta_t = 6.476 [sec])
661.000 664.132 (delta_t = 3.132 [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
Multiple GTIs in the spectrum
tstart tstop
155.000000 299.324700
307.000000 317.135500
361.000000 370.070000
420.000000 483.130100
541.000000 545.179000
601.000000 607.475900
661.000000 664.132100
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.14861 ( -0.835159 1.22239 )
Norm@50keV : 8.35740E-05 ( -8.35625e-05 7.54186e-05 )
------------------------------------------------------------
# Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.847832e-01
Photon flux (15-150 keV) in 240.4 sec: 2.56575E-02 ( -0.00784247 0.00788434 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59344e-07 ( -1.00547e-07 1.21168e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
155.000000 299.324700
307.000000 317.135500
361.000000 370.070000
420.000000 483.130100
541.000000 545.179000
601.000000 607.475900
661.000000 664.132100
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61966 ( )
Epeak [keV] : 6.32004 ( )
Norm@50keV : 1.18516E-03 ( )
------------------------------------------------------------
# Chi-Squared = 57.13 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.330610e-01
Photon flux (15-150 keV) in 240.4 sec: 2.56446E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59276e-07 ( -1.0052e-07 1.21111e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
155.000000 299.324700
307.000000 317.135500
361.000000 370.070000
420.000000 483.130100
541.000000 545.179000
601.000000 607.475900
661.000000 664.132100
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.65847 ( 6.22089 6.22089 )
beta : -3.14971 ( -1.22216 0.83519 )
Epeak [keV] : 6.36519 ( -6.36519 -6.36519 )
Norm@50keV : 1.13485E-02 ( -0.00798887 0.0102521 )
------------------------------------------------------------
# Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.099539e-01
Photon flux (15-150 keV) in 240.4 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 661.000 sec. to 664.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.27355 ( -0.808064 1.20046 )
Norm@50keV : 7.81844E-05 ( -7.81798e-05 7.44506e-05 )
------------------------------------------------------------
# Chi-Squared = 57.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.519890e-01
Photon flux (15-150 keV) in 240.4 sec: 2.64138E-02 ( -0.007644 0.00767321 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5924e-07 ( -9.80673e-08 1.18376e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 661.000 sec. to 664.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.00284E-04 ( )
------------------------------------------------------------
# Chi-Squared = 69.62 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 56 degrees of freedom
# Null hypothesis probability = 1.043261e-01
Photon flux (15-150 keV) in 240.4 sec: 2.64001E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5917e-07 ( -9.80423e-08 1.18322e-07 ) ergs/cm2
Band function
Time interval is from 661.000 sec. to 664.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.57534 ( 6.02071 6.02071 )
beta : -3.27414 ( -1.20056 0.807638 )
Epeak [keV] : 5.61250 ( -5.6125 -5.6125 )
Norm@50keV : 1.06208E-02 ( -0.00753966 0.0101245 )
------------------------------------------------------------
# Chi-Squared = 57.62 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Null hypothesis probability = 3.784096e-01
Photon flux (15-150 keV) in 240.4 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:
Thu Oct 14 13:46:47 EDT 2010