batgrbproduct Analysis for Trigger=433953
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): Sun Sep 12 19:31:50 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger433953/GCN5_download_cron
======================================================================
Trigger: 00433953 Segment: 000
BAT Trigger Time: 305959752 [s; MET]
Trigger Stop: 305959816 [s; MET]
UTC: 2010-09-12T04:49:05.830960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 42.6433059044479 Dec: -2.20043626314446 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.33
Flight Position: [ source = BAT ]
RA: 42.6433059044479 Dec: -2.20043626314446 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.6258787032092 Dec: -2.29660580353955 [deg; J2000]
{ 02h 50m 30.2s , -02d 17' 47.8" }
+/- 4.69060629065515 [arcmin] (estimated 90% radius based on SNR)
+/- 2.85566753534742 [arcmin] (formal 1-sigma fit error)
SNR: 3.34364248442398
Angular difference between Flight and Ground position is 5.864005 arcmin
Partial Coding Fraction: 0.9375 [ 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 0.173024 0.198308 -0.051402 -0.086286
0.039715 0.040976 0.036545 0.032509 [error]
Peak 0.173024 0.198308 -0.051402 -0.086286
0.039715 0.040976 0.036545 0.032509 [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 4.66e-08 4.71e-08 3.34e-08 3.77e-08 1.42e-07 1.65e-07 erg/cm2
Error 1.65e-08 1.80e-08 2.18e-08 5.02e-08 4.41e-08 8.51e-08 erg/cm2
Peak flux Power-law 2.40e-02 1.36e-02 4.83e-03 2.26e-03 4.36e-02 4.47e-02 ph/cm2/s
Error 8.35e-03 4.98e-03 4.11e-03 2.81e-03 1.45e-02 1.51e-02 ph/cm2/s
Fluence Cutoff-PL 4.84e-08 7.95e-08 2.42e-09 1.89e-14 1.30e-07 1.30e-07 erg/cm2
Error 1.96e-08 3.06e-08 8.28e-09 3.92e-11 3.88e-08 3.88e-08 erg/cm2
Peak flux Cutoff-PL 2.34e-02 2.43e-02 4.39e-04 1.97e-09 4.81e-02 4.81e-02 ph/cm2/s
Error 9.66e-03 8.46e-03 1.38e-03 1.31e-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 2.49e-02 2.03e-02 3.80e-03 4.84e-02 0.00e+00 0.00e+00 ph/cm2/s
Error 8.05e-03 6.31e-03 1.38e-02 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 2.506 0.569 - - 2.20e-04 1.13e-04 80.210 57
CPL -7.896 0.000 28.1 4.0 3.97e+03 8.69e+04 64.800 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 2.480 0.562 - - 2.25e-04 1.12e-04 80.900 57
CPL -7.790 0.000 28.1 4.0 3.38e+03 8.90e+04 65.270 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
42.6259 -2.2966 0.0574 25.2 -159.2 0.2549 3.3 TRIG_00433953
------------------------------------------
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: 2.50647 ( -0.517568 0.620293 )
Norm@50keV : 2.20182E-04 ( -0.000106672 0.000118787 )
------------------------------------------------------------
# Chi-Squared = 80.21 using 59 PHA bins.
# Reduced chi-squared = 1.407 for 57 degrees of freedom
# Null hypothesis probability = 2.304575e-02
Photon flux (15-150 keV) in 64 sec: 4.34896E-02 ( -0.0146079 0.0146943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41938e-07 ( -2.61215e-08 6.21673e-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: -7.89641 ( )
Epeak [keV] : 28.0816 ( -3.60344 4.47046 )
Norm@50keV : 3971.65 ( -3882.67 169997 )
------------------------------------------------------------
# Chi-Squared = 64.80 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 56 degrees of freedom
# Null hypothesis probability = 1.965256e-01
Photon flux (15-150 keV) in 64 sec: 4.77877E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30298e-07 ( -3.69037e-08 4.06381e-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 : 4.99204 ( -252.062 -242.062 )
beta : -9.99795 ( 1547.13 1557.12 )
Epeak [keV] : 28.4236 ( -4.07972 4.64228 )
Norm@50keV : 34.0600 ( -34.0601 50.509 )
------------------------------------------------------------
# Chi-Squared = 65.31 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.610358e-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: 2.48049 ( -0.496995 0.626281 )
Norm@50keV : 2.25105E-04 ( -0.000107978 0.000116807 )
------------------------------------------------------------
# Chi-Squared = 80.90 using 59 PHA bins.
# Reduced chi-squared = 1.419 for 57 degrees of freedom
# Null hypothesis probability = 2.038597e-02
Photon flux (15-150 keV) in 64 sec: 4.36483E-02 ( -0.0144253 0.0145241 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42695e-07 ( -5.39585e-08 6.19371e-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: -7.78967 ( )
Epeak [keV] : 28.0631 ( -3.57143 4.41863 )
Norm@50keV : 3384.56 ( -3343.07 174622 )
------------------------------------------------------------
# Chi-Squared = 65.27 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 56 degrees of freedom
# Null hypothesis probability = 1.856263e-01
Photon flux (15-150 keV) in 64 sec: 4.80916E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31044e-07 ( -3.69722e-08 4.03898e-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 : 4.99960 ( -4758.02 -4743.03 )
beta : -9.99791 ( 1519.12 1529.12 )
Epeak [keV] : 28.3915 ( -4.01757 4.5809 )
Norm@50keV : 34.8949 ( -34.8949 60.7277 )
------------------------------------------------------------
# Chi-Squared = 65.76 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 55 degrees of freedom
# Null hypothesis probability = 1.517873e-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:
Sun Sep 12 19:45:41 EDT 2010