batgrbproduct Analysis for Trigger=430975
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): Fri Aug 6 00:43:27 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger430975/GCN5_download_cron
======================================================================
Trigger: 00430975 Segment: 000
BAT Trigger Time: 302687704 [s; MET]
Trigger Stop: 302687768 [s; MET]
UTC: 2010-08-05T07:54:57.948900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 56.5816063485689 Dec: -3.69402978975897 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 56.5816063485689 Dec: -3.69402978975897 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 56.6010004977516 Dec: -3.72672625650101 [deg; J2000]
{ 03h 46m 24.2s , -03d 43' 36.2" }
+/- 4.17977394629485 [arcmin] (estimated 90% radius based on SNR)
+/- 2.67199296759764 [arcmin] (formal 1-sigma fit error)
SNR: 3.9423687613881
Angular difference between Flight and Ground position is 2.279697 arcmin
Partial Coding Fraction: 0.9140625 [ 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 0.148443 0.179939 -0.081484 -0.011583
0.040892 0.040674 0.035581 0.031554 [error]
Peak 0.148443 0.179939 -0.081484 -0.011583
0.040892 0.040674 0.035581 0.031554 [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 4.74e-08 4.03e-08 2.34e-08 2.03e-08 1.20e-07 1.32e-07 erg/cm2
Error 1.74e-08 1.79e-08 1.85e-08 3.19e-08 5.31e-08 6.92e-08 erg/cm2
Peak flux Power-law 2.49e-02 1.20e-02 3.49e-03 1.28e-03 4.12e-02 4.18e-02 ph/cm2/s
Error 9.12e-03 5.11e-03 3.28e-03 1.87e-03 1.47e-02 1.51e-02 ph/cm2/s
Fluence Cutoff-PL 4.38e-08 7.54e-08 4.46e-09 4.03e-13 1.24e-07 1.24e-07 erg/cm2
Error 2.07e-08 2.93e-08 1.07e-08 1.90e-10 4.04e-08 4.04e-08 erg/cm2
Peak flux Cutoff-PL 2.17e-02 2.30e-02 8.12e-04 4.23e-08 4.56e-02 4.56e-02 ph/cm2/s
Error 1.07e-02 8.36e-03 1.77e-03 1.40e-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 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 2.775 0.689 - - 1.75e-04 1.44e-04 71.810 57
CPL -6.611 0.000 28.7 5.2 3.85e+02 0.00e+00 61.060 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 2.755 0.681 - - 1.78e-04 1.45e-04 72.280 57
CPL -6.432 0.000 28.7 5.1 2.93e+02 0.00e+00 61.390 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
56.6010 -3.7267 0.0488 26.3 -15.7 0.3058 3.9 TRIG_00430975
------------------------------------------
Foreground time interval of the image:
0.000 19.840 (delta_t = 19.840 [sec])
21.000 64.000 (delta_t = 43.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 19.840000
21.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77533 ( -0.579145 0.798937 )
Norm@50keV : 1.75295E-04 ( -0.000174728 0.000113774 )
------------------------------------------------------------
# Chi-Squared = 71.81 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 57 degrees of freedom
# Null hypothesis probability = 8.956740e-02
Photon flux (15-150 keV) in 62.84 sec: 4.11059E-02 ( -0.0147723 0.0148941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19978e-07 ( -4.93941e-08 5.68248e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 19.840000
21.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.61125 ( )
Epeak [keV] : 28.7357 ( -5.15035 5.25524 )
Norm@50keV : 385.357 ( )
------------------------------------------------------------
# Chi-Squared = 61.06 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 56 degrees of freedom
# Null hypothesis probability = 2.992065e-01
Photon flux (15-150 keV) in 62.84 sec: 4.52713E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2369e-07 ( -3.94887e-08 4.12853e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 19.840000
21.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.27344 ( -6.90523 4.57125 )
beta : -9.37167 ( 9.99999 20 )
Epeak [keV] : 29.6612 ( -5.96701 4.66486 )
Norm@50keV : 7.92101 ( -7.79281 38.9257 )
------------------------------------------------------------
# Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.584313e-01
Photon flux (15-150 keV) in 62.84 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 21.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75531 ( -0.563104 0.799306 )
Norm@50keV : 1.78268E-04 ( -0.000176901 0.000112469 )
------------------------------------------------------------
# Chi-Squared = 72.28 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 57 degrees of freedom
# Null hypothesis probability = 8.358715e-02
Photon flux (15-150 keV) in 62.84 sec: 4.11733E-02 ( -0.0146212 0.0147533 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20413e-07 ( -4.93968e-08 5.65528e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.43169 ( )
Epeak [keV] : 28.7179 ( -5.09364 5.19725 )
Norm@50keV : 292.970 ( )
------------------------------------------------------------
# Chi-Squared = 61.39 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.889822e-01
Photon flux (15-150 keV) in 62.84 sec: 4.55741E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24449e-07 ( -3.92147e-08 4.10515e-08 ) ergs/cm2
Band function
Time interval is from 21.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.12075 ( -6.8122 4.36896 )
beta : -9.37167 ( 9.99992 19.9999 )
Epeak [keV] : 29.1946 ( -5.48739 4.94072 )
Norm@50keV : 6.70192 ( -6.73169 6.59937 )
------------------------------------------------------------
# Chi-Squared = 61.64 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.507847e-01
Photon flux (15-150 keV) in 62.84 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:
Fri Aug 6 01:00:17 EDT 2010