batgrbproduct Analysis for Trigger=352294
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 10:07:22 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352294/SDC
======================================================================
Trigger: 00352294 Segment: 000
BAT Trigger Time: 264236540.096 [s; MET]
Trigger Stop: 264236566.976 [s; MET]
UTC: 2009-05-17T07:02:15.347820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 109.436580944308 Dec: -50.736229533679 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.83
Image Trigger?: NO
Rate S/N Ratio: 20.2977831301844 [ if not an image trigger ]
Image S/N Ratio: 5.83
Flight Position: [ source = BAT ]
RA: 109.436580944308 Dec: -50.736229533679 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 109.446132306089 Dec: -50.7459847966475 [deg; J2000]
{ 07h 17m 47.1s , -50d 44' 45.5" }
+/- 6.52069529539567 [arcmin] (estimated 90% radius based on SNR)
+/- 5.19857263300806 [arcmin] (formal 1-sigma fit error)
SNR: 2.08853313852933
Angular difference between Flight and Ground position is 0.688562 arcmin
Partial Coding Fraction: 0.4492188 [ including projection effects ]
Duration
T90: 26.880000025034 +/-
Measured from: 0
to: 26.880000025034 [s; relative to TRIGTIME]
T50: 26.880000025034 +/-
Measured from: 0
to: 26.880000025034 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.880000025034 second)
Measured from: 1.49011611938477e-08
to: 26.8800000399351 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.880000025034 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.137251 0.174273 -0.031973 -0.012607
0.048037 0.046371 0.040002 0.036916 [error]
Peak 0.137251 0.174273 -0.031973 -0.012607
0.048037 0.046371 0.040002 0.036916 [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-08 4.87e-08 2.80e-08 2.40e-08 1.45e-07 1.58e-07 erg/cm2
Error 2.58e-08 2.47e-08 3.00e-08 4.92e-08 7.22e-08 9.76e-08 erg/cm2
Peak flux Power-law 7.11e-02 3.37e-02 9.69e-03 3.50e-03 1.16e-01 1.18e-01 ph/cm2/s
Error 3.25e-02 1.65e-02 1.01e-02 6.57e-03 4.71e-02 4.79e-02 ph/cm2/s
Fluence Cutoff-PL 4.84e-08 7.45e-08 7.86e-09 7.67e-12 1.30e-07 1.30e-07 erg/cm2
Error 4.02e-08 3.85e-08 1.85e-08 6.37e-09 5.24e-08 5.25e-08 erg/cm2
Peak flux Cutoff-PL 5.65e-02 5.23e-02 3.19e-03 1.68e-06 1.12e-01 1.12e-01 ph/cm2/s
Error 4.85e-02 2.60e-02 6.64e-03 1.08e-03 4.64e-02 4.65e-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 2.797 0.948 - - 4.89e-04 3.52e-04 57.040 57
CPL -4.220 0.000 28.8 12.2 2.04e+01 0.00e+00 53.930 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 2.797 0.948 - - 4.89e-04 3.52e-04 57.040 57
CPL -4.220 0.000 28.8 13.2 2.04e+01 0.00e+00 53.930 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
109.4461 -50.7460 0.0918 45.5 -174.3 0.2897 2.1 TRIG_00352294
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.096 -44.096 (delta_t = 16.000 [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: 2.79704 ( -0.773835 1.12295 )
Norm@50keV : 4.88822E-04 ( -0.000330345 0.000373909 )
------------------------------------------------------------
# Chi-Squared = 57.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.735650e-01
Photon flux (15-150 keV) in 26.88 sec: 0.116469 ( -0.0470147 0.0472468 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44859e-07 ( -6.73658e-08 7.70857e-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: -4.21995 ( )
Epeak [keV] : 28.7559 ( -15.8022 8.61983 )
Norm@50keV : 20.3753 ( )
------------------------------------------------------------
# Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9630 for 56 degrees of freedom
# Null hypothesis probability = 5.538014e-01
Photon flux (15-150 keV) in 26.88 sec: 0.112040 ( -0.0467598 0.04612 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30488e-07 ( -5.03091e-08 5.45473e-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 : 3.42768 ( -5.6729 -5.83078 )
beta : -9.36964 ( 10 19.995 )
Epeak [keV] : 28.4870 ( -7.06246 7.17125 )
Norm@50keV : 6.09183 ( -6.08966 29.1943 )
------------------------------------------------------------
# Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9802 for 55 degrees of freedom
# Null hypothesis probability = 5.163008e-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: 2.79704 ( -0.773835 1.12295 )
Norm@50keV : 4.88822E-04 ( -0.000330345 0.000373909 )
------------------------------------------------------------
# Chi-Squared = 57.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.735650e-01
Photon flux (15-150 keV) in 26.88 sec: 0.116469 ( -0.0470147 0.0472468 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44859e-07 ( -6.73658e-08 7.70857e-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: -4.21995 ( )
Epeak [keV] : 28.7559 ( -17.7374 8.61281 )
Norm@50keV : 20.3753 ( )
------------------------------------------------------------
# Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9630 for 56 degrees of freedom
# Null hypothesis probability = 5.538014e-01
Photon flux (15-150 keV) in 26.88 sec: 0.112040 ( -0.0467598 0.04612 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30488e-07 ( -5.03091e-08 5.45473e-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 : 3.42768 ( -15.6878 -5.83078 )
beta : -9.36964 ( 10 19.995 )
Epeak [keV] : 28.4870 ( -7.06246 7.17125 )
Norm@50keV : 6.09183 ( -6.08966 29.1943 )
------------------------------------------------------------
# Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9802 for 55 degrees of freedom
# Null hypothesis probability = 5.163008e-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 10:13:15 EDT 2011