batgrbproduct Analysis for Trigger=435520
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 Oct 4 03:42:42 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger435520/GCN5_download_cron
======================================================================
Trigger: 00435520 Segment: 000
BAT Trigger Time: 307790288 [s; MET]
Trigger Stop: 307790352 [s; MET]
UTC: 2010-10-03T09:18:01.764400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 300.937293331406 Dec: 32.3863283392225 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.05
Flight Position: [ source = BAT ]
RA: 300.937293331406 Dec: 32.3863283392225 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 300.984605202389 Dec: 32.3287227028979 [deg; J2000]
{ 20h 03m 56.3s , +32d 19' 43.4" }
+/- 8.75387178617382 [arcmin] (estimated 90% radius based on SNR)
+/- 9.04255748504915 [arcmin] (formal 1-sigma fit error)
SNR: 1.37125467373458
Angular difference between Flight and Ground position is 4.206702 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 64 +/- 35.7770876399966
Measured from: 1.00000011920929
to: 65.0000001192093 [s; relative to TRIGTIME]
T50: 32 +/- 22.6274169979695
Measured from: 17.0000001192093
to: 49.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.5
to: 41.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1
to: 81 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.212989 0.211201 0.059124 0.115036
0.052875 0.054507 0.050274 0.051593 [error]
Peak 0.004058 0.013354 -0.000130 0.003533
0.005981 0.006073 0.005556 0.005733 [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 5.39e-08 7.90e-08 8.63e-08 1.77e-07 2.73e-07 3.96e-07 erg/cm2
Error 2.32e-08 2.50e-08 4.83e-08 2.36e-07 1.11e-07 2.65e-07 erg/cm2
Peak flux Power-law 5.50e-02 5.00e-02 3.13e-02 3.00e-02 1.49e-01 1.67e-01 ph/cm2/s
Error 6.70e-02 4.91e-02 3.75e-02 3.13e-01 1.44e-01 3.18e-01 ph/cm2/s
Fluence Cutoff-PL 5.39e-08 7.90e-08 8.63e-08 1.75e-07 2.73e-07 3.23e-07 erg/cm2
Error 2.32e-08 2.51e-08 4.83e-08 2.34e-07 1.11e-07 2.82e-07 erg/cm2
Peak flux Cutoff-PL 5.27e-02 9.03e-02 2.40e-03 9.88e-09 1.46e-01 1.46e-01 ph/cm2/s
Error 6.95e-02 7.56e-02 3.24e-02 1.17e-01 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 1.24e-01 1.37e-01 3.55e-01 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.09e-01 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 1.872 0.641 - - 3.72e-04 1.52e-04 61.380 57
CPL 1.483 0.000 47.7 0.0 6.59e-04 0.00e+00 61.560 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 1.668 2.414 - - 1.14e-03 1.16e-03 53.610 57
CPL -1.350 0.000 36.6 0.0 1.25e-01 0.00e+00 52.850 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 80.000 1.000 81.000
T90 64.000 1.000 65.000
T50 32.000 17.000 49.000
Peak 1.000 40.500 41.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
300.9846 +32.3287 0.1397 25.4 -147.7 0.4283 1.4 TRIG_00435520
------------------------------------------
Foreground time interval of the image:
1.000 74.101 (delta_t = 73.101 [sec])
Background time interval of the image:
-7.599 1.000 (delta_t = 8.599 [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 1.000 sec. to 81.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87215 ( -0.59713 0.685715 )
Norm@50keV : 3.71522E-04 ( -0.000157617 0.000147143 )
------------------------------------------------------------
# Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.220689e-01
Photon flux (15-150 keV) in 80 sec: 5.26982E-02 ( -0.0163431 0.0163477 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73234e-07 ( -1.06188e-07 1.16741e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 81.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48275 ( )
Epeak [keV] : 47.6575 ( )
Norm@50keV : 6.58805E-04 ( )
------------------------------------------------------------
# Chi-Squared = 61.56 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.838823e-01
Photon flux (15-150 keV) in 80 sec: 5.26787E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73146e-07 ( -1.06156e-07 1.16723e-07 ) ergs/cm2
Band function
Time interval is from 1.000 sec. to 81.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.11568 ( 1.23803 1.23803 )
beta : -1.97017 ( 1.92305 0.63845 )
Epeak [keV] : 22.4965 ( -31.1784 -31.1784 )
Norm@50keV : 9.72048E-02 ( -0.0972049 85.6853 )
------------------------------------------------------------
# Chi-Squared = 61.22 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.625501e-01
Photon flux (15-150 keV) in 80 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 40.500 sec. to 41.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66810 ( -1.67729 3.1516 )
Norm@50keV : 1.13837E-03 ( -0.00113272 0.00119656 )
------------------------------------------------------------
# Chi-Squared = 53.61 using 59 PHA bins.
# Reduced chi-squared = 0.9406 for 57 degrees of freedom
# Null hypothesis probability = 6.029594e-01
Photon flux (15-150 keV) in 1 sec: 0.148853 ( -0.143776 0.143837 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04925e-08 ( -1.04925e-08 1.2876e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34952 ( )
Epeak [keV] : 36.5764 ( )
Norm@50keV : 0.125246 ( )
------------------------------------------------------------
# Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 56 degrees of freedom
# Null hypothesis probability = 5.947573e-01
Photon flux (15-150 keV) in 1 sec: 0.145936 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.73818e-09 ( -5.26931e-09 1.21199e-08 ) ergs/cm2
Band function
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99607 ( -488.088 -488.088 )
beta : -3.94944 ( 3.97969 3.97969 )
Epeak [keV] : 31.9400 ( -31.9182 34.9506 )
Norm@50keV : 47.4892 ( -48.0333 1.51665e+06 )
------------------------------------------------------------
# Chi-Squared = 52.31 using 59 PHA bins.
# Reduced chi-squared = 0.9510 for 55 degrees of freedom
# Null hypothesis probability = 5.782289e-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:
Mon Oct 4 04:06:53 EDT 2010