batgrbproduct Analysis for Trigger=355333
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): Wed Jun 1 14:42:31 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355333/SDC
======================================================================
Trigger: 00355333 Segment: 000
BAT Trigger Time: 267281090.112 [s; MET]
Trigger Stop: 267281091.136 [s; MET]
UTC: 2009-06-21T12:44:45.266320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 4.98806968663468 Dec: 46.3256744940323 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.73
Image Trigger?: NO
Rate S/N Ratio: 13.076696830622 [ if not an image trigger ]
Image S/N Ratio: 5.73
Flight Position: [ source = BAT ]
RA: 4.98806968663468 Dec: 46.3256744940323 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 4.89140551119075 Dec: 46.2317891310411 [deg; J2000]
{ 00h 19m 33.9s , +46d 13' 54.4" }
+/- 3.92791938653413 [arcmin] (estimated 90% radius based on SNR)
+/- 2.78361543004432 [arcmin] (formal 1-sigma fit error)
SNR: 4.30838707285361
Angular difference between Flight and Ground position is 6.913804 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: 1.49011611938477e-08
to: 1.02400003373623 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001112 -0.000225 0.016625 0.021841
0.005355 0.005552 0.005405 0.005784 [error]
Peak 0.001112 -0.000225 0.016625 0.021841
0.005355 0.005552 0.005405 0.005784 [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 5.77e-11 6.85e-10 7.43e-09 5.99e-07 3.30e-08 6.08e-07 erg/cm2
Error 2.74e-10 1.41e-09 6.94e-09 4.46e-07 1.84e-08 4.51e-07 erg/cm2
Peak flux Power-law 1.71e-03 1.06e-02 5.74e-02 1.42e+00 1.88e-01 1.50e+00 ph/cm2/s
Error 8.33e-03 2.28e-02 5.54e-02 1.04e+00 1.53e-01 7.97e-01 ph/cm2/s
Fluence Cutoff-PL 3.22e-11 4.84e-10 6.67e-09 8.03e-07 3.47e-08 3.34e-08 erg/cm2
Error 2.57e-10 1.36e-09 6.87e-09 1.23e-06 1.23e-06 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.61e-04 7.77e-04 6.49e-03 4.80e-02 1.95e+00 1.88e-01 ph/cm2/s
Error 2.20e-02 5.44e-02 6.06e+00 9.40e-02 2.67e+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 -1.407 1.014 - - 6.57e-04 9.70e-04 61.610 57
CPL -2.291 1.530 10000.0 0.0 2.87e-04 5.03e-03 61.420 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 -1.407 1.014 - - 6.57e-04 9.70e-04 61.610 57
CPL -2.291 1.530 10000.0 0.0 2.87e-04 5.03e-03 61.420 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
4.8914 +46.2318 0.0446 16.1 17.6 0.0470 4.3 TRIG_00355333
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.112 -10.112 (delta_t = 50.000 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.40695 ( -0.703924 1.32308 )
Norm@50keV : 6.57000E-04 ( -0.000643562 0.00129561 )
------------------------------------------------------------
# Chi-Squared = 61.61 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.147941e-01
Photon flux (15-150 keV) in 1.024 sec: 0.188336 ( -0.188332 0.118292 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29667e-08 ( -2.05242e-08 1.63394e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.29114 ( -0.768094 2.29151 )
Epeak [keV] : 9999.97 ( )
Norm@50keV : 2.86937E-04 ( -0.000287055 0.00976463 )
------------------------------------------------------------
# Chi-Squared = 61.42 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 56 degrees of freedom
# Null hypothesis probability = 2.879179e-01
Photon flux (15-150 keV) in 1.024 sec: 0.187858 ( -0.122796 0.065132 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10805e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.755142 ( -0.749757 -0.749757 )
beta : 1.44797 ( -1.349 0.681225 )
Epeak [keV] : 14.4368 ( -14.4879 -14.4879 )
Norm@50keV : 1.59669E-03 ( -0.00160348 146.396 )
------------------------------------------------------------
# Chi-Squared = 61.60 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.517190e-01
Photon flux (15-150 keV) in 1.024 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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.40695 ( -0.703924 1.32308 )
Norm@50keV : 6.57000E-04 ( -0.000643562 0.00129561 )
------------------------------------------------------------
# Chi-Squared = 61.61 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.147941e-01
Photon flux (15-150 keV) in 1.024 sec: 0.188336 ( -0.188332 0.118292 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29667e-08 ( -2.05242e-08 1.63394e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.29114 ( -0.768094 2.29151 )
Epeak [keV] : 9999.97 ( )
Norm@50keV : 2.86937E-04 ( -0.000287055 0.00976463 )
------------------------------------------------------------
# Chi-Squared = 61.42 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 56 degrees of freedom
# Null hypothesis probability = 2.879179e-01
Photon flux (15-150 keV) in 1.024 sec: 0.187858 ( -0.122796 0.065132 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10805e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.755142 ( -0.749757 -0.749757 )
beta : 1.44797 ( -1.349 0.681225 )
Epeak [keV] : 14.4368 ( -14.4879 -14.4879 )
Norm@50keV : 1.59669E-03 ( -0.00160348 146.396 )
------------------------------------------------------------
# Chi-Squared = 61.60 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.517190e-01
Photon flux (15-150 keV) in 1.024 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:
Wed Jun 1 15:21:59 EDT 2011