batgrbproduct Analysis for Trigger=352305
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 Jun 2 09:54:13 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352305/SDC
======================================================================
Trigger: 00352305 Segment: 000
BAT Trigger Time: 264241791.168 [s; MET]
Trigger Stop: 264241818.048 [s; MET]
UTC: 2009-05-17T08:29:46.419640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 151.182982890813 Dec: 3.73372213350476 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.69
Image Trigger?: NO
Rate S/N Ratio: 33.7934904974316 [ if not an image trigger ]
Image S/N Ratio: 5.69
Flight Position: [ source = BAT ]
RA: 151.182982890813 Dec: 3.73372213350476 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 151.420950894942 Dec: 3.858985569419 [deg; J2000]
{ 10h 05m 41.0s , +03d 51' 32.3" }
+/- 13.3203523791511 [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR: 0.752778765829056
Angular difference between Flight and Ground position is 16.107673 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.071781 0.109225 -0.026971 0.035650
0.030952 0.030149 0.025932 0.025282 [error]
Peak 0.071781 0.109225 -0.026971 0.035650
0.030952 0.030149 0.025932 0.025282 [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 2.09e-08 2.41e-08 1.99e-08 2.77e-08 7.49e-08 9.32e-08 erg/cm2
Error 1.23e-08 1.37e-08 2.09e-08 5.79e-08 4.74e-08 8.42e-08 erg/cm2
Peak flux Power-law 2.55e-02 1.63e-02 6.75e-03 3.79e-03 5.05e-02 5.25e-02 ph/cm2/s
Error 1.53e-02 9.04e-03 6.91e-03 7.19e-03 2.62e-02 2.77e-02 ph/cm2/s
Fluence Cutoff-PL 7.65e-09 4.79e-08 7.71e-09 1.19e-12 6.33e-08 6.34e-08 erg/cm2
Error 1.44e-08 2.28e-08 1.35e-08 2.53e-09 3.04e-08 3.04e-08 erg/cm2
Peak flux Cutoff-PL 8.39e-03 3.16e-02 3.16e-03 2.60e-07 4.31e-02 4.31e-02 ph/cm2/s
Error 1.71e-02 1.38e-02 4.92e-03 4.78e-04 2.34e-02 2.34e-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 2.284 1.015 - - 2.91e-04 2.14e-04 71.970 57
CPL -8.821 0.000 36.8 0.0 1.05e+03 0.00e+00 67.940 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 2.284 1.015 - - 2.91e-04 2.14e-04 71.970 57
CPL -8.821 0.000 36.8 0.0 1.05e+03 0.00e+00 67.940 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 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
151.4210 +3.8590 0.0000 20.4 21.0 0.0729 0.8 TRIG_00352305
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.168 -47.168 (delta_t = 13.000 [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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28378 ( -0.841432 1.18949 )
Norm@50keV : 2.91187E-04 ( -0.000206436 0.000221006 )
------------------------------------------------------------
# Chi-Squared = 71.97 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.748666e-02
Photon flux (15-150 keV) in 26.88 sec: 5.04687E-02 ( -0.0261259 0.0262227 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49199e-08 ( -4.27112e-08 5.20856e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.82141 ( )
Epeak [keV] : 36.8476 ( )
Norm@50keV : 1053.45 ( )
------------------------------------------------------------
# Chi-Squared = 67.94 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 56 degrees of freedom
# Null hypothesis probability = 1.316324e-01
Photon flux (15-150 keV) in 26.88 sec: 4.31340E-02 ( -0.0189754 0.0278822 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33234e-08 ( -2.77138e-08 3.30256e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92411 ( -37.1529 -27.1544 )
beta : -9.37158 ( 9.9999 7.20558 )
Epeak [keV] : 35.1693 ( -8.21011 9.66712 )
Norm@50keV : 7.71878 ( -7.70695 7.38915 )
------------------------------------------------------------
# Chi-Squared = 68.27 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 55 degrees of freedom
# Null hypothesis probability = 1.077703e-01
Photon flux (15-150 keV) in 26.88 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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28378 ( -0.841432 1.18949 )
Norm@50keV : 2.91187E-04 ( -0.000206436 0.000221006 )
------------------------------------------------------------
# Chi-Squared = 71.97 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.748666e-02
Photon flux (15-150 keV) in 26.88 sec: 5.04687E-02 ( -0.0261259 0.0262227 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49199e-08 ( -4.27118e-08 5.20856e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.82141 ( )
Epeak [keV] : 36.8476 ( )
Norm@50keV : 1053.45 ( )
------------------------------------------------------------
# Chi-Squared = 67.94 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 56 degrees of freedom
# Null hypothesis probability = 1.316324e-01
Photon flux (15-150 keV) in 26.88 sec: 4.31340E-02 ( -0.0189754 0.0278822 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33234e-08 ( -2.77138e-08 3.30256e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92411 ( -37.1507 -27.1544 )
beta : -9.37158 ( 9.9999 7.20558 )
Epeak [keV] : 35.1693 ( -8.21011 9.66712 )
Norm@50keV : 7.71878 ( -7.70695 7.38915 )
------------------------------------------------------------
# Chi-Squared = 68.27 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 55 degrees of freedom
# Null hypothesis probability = 1.077703e-01
Photon flux (15-150 keV) in 26.88 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 Jun 2 10:01:34 EDT 2011