batgrbproduct Analysis for Trigger=445038
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 Feb 9 06:59:02 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger445038/GCN5_download_cron
======================================================================
Trigger: 00445038 Segment: 000
BAT Trigger Time: 318892252.992 [s; MET]
Trigger Stop: 318892254.016 [s; MET]
UTC: 2011-02-08T21:10:46.347120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.4841525330872 Dec: -20.6284702440465 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.81
Image Trigger?: NO
Rate S/N Ratio: 10.4880884817015 [ if not an image trigger ]
Image S/N Ratio: 7.81
Flight Position: [ source = BAT ]
RA: 22.4841525330872 Dec: -20.6284702440465 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.4866104235306 Dec: -20.5613703159033 [deg; J2000]
{ 01h 29m 56.8s , -20d 33' 40.9" }
+/- 1.7823771178986 [arcmin] (estimated 90% radius based on SNR)
+/- 0.956738145287886 [arcmin] (formal 1-sigma fit error)
SNR: 13.321328119467
Angular difference between Flight and Ground position is 4.028362 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 36.7360000610352 +/- 7.9086787835079
Measured from: -0.935999870300293
to: 35.8000001907349 [s; relative to TRIGTIME]
T50: 7.79200005531311 +/- 16.4821455232554
Measured from: 0.760000109672546
to: 8.55200016498566 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.460000038146973
to: 1.46000003814697 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.54399996995926
to: 40.7599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.231309 0.213315 0.082459 0.021424
0.030647 0.030636 0.027388 0.024799 [error]
Peak 0.018532 0.034972 0.021085 0.004361
0.004964 0.005087 0.004456 0.003906 [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 6.47e-08 8.30e-08 7.78e-08 1.28e-07 2.69e-07 3.54e-07 erg/cm2
Error 1.33e-08 1.38e-08 2.41e-08 7.71e-08 5.51e-08 1.07e-07 erg/cm2
Peak flux Power-law 2.01e-01 2.06e-01 1.49e-01 1.72e-01 6.22e-01 7.27e-01 ph/cm2/s
Error 5.71e-02 3.89e-02 3.44e-02 7.74e-02 1.14e-01 1.37e-01 ph/cm2/s
Fluence Cutoff-PL 6.11e-08 9.34e-08 6.84e-08 2.24e-08 2.40e-07 2.45e-07 erg/cm2
Error 1.48e-08 1.98e-08 3.05e-08 9.05e-08 6.00e-08 1.19e-07 erg/cm2
Peak flux Cutoff-PL 1.44e-01 2.58e-01 1.55e-01 2.06e-02 5.76e-01 5.78e-01 ph/cm2/s
Error 6.76e-02 5.57e-02 4.66e-02 1.20e-01 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 2.094 0.316 - - 6.84e-04 1.54e-04 58.010 57
CPL 1.061 1.582 34.7 0.0 2.92e-03 0.00e+00 56.380 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 1.469 0.287 - - 5.02e-03 9.48e-04 45.470 57
CPL -0.919 2.067 55.3 19.6 9.73e-02 9.90e-01 38.610 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 42.304 -1.544 40.760
T90 36.736 -0.936 35.800
T50 7.792 0.760 8.552
Peak 1.000 0.460 1.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.4866 -20.5614 0.0144 13.7 158.6 0.4907 13.3 TRIG_00445038
------------------------------------------
Foreground time interval of the image:
-1.544 17.009 (delta_t = 18.553 [sec])
Background time interval of the image:
-239.992 -1.544 (delta_t = 238.448 [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 -1.544 sec. to 40.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09399 ( -0.29935 0.332521 )
Norm@50keV : 6.84250E-04 ( -0.000156461 0.000152227 )
------------------------------------------------------------
# Chi-Squared = 58.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.377127e-01
Photon flux (15-150 keV) in 42.3 sec: 0.107332 ( -0.0168647 0.0168691 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68764e-07 ( -5.36948e-08 5.65779e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.544 sec. to 40.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06124 ( -1.91317 1.25045 )
Epeak [keV] : 34.6631 ( )
Norm@50keV : 2.92080E-03 ( )
------------------------------------------------------------
# Chi-Squared = 56.38 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.607108e-01
Photon flux (15-150 keV) in 42.3 sec: 0.103643 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39821e-07 ( -5.34752e-08 6.65074e-08 ) ergs/cm2
Band function
Time interval is from -1.544 sec. to 40.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25296 ( 1.28236 2.02568 )
beta : -10.00000 ( 5.91583e+08 5.91583e+08 )
Epeak [keV] : 33.8697 ( -32.4589 -34.0139 )
Norm@50keV : 2.24413E-03 ( -0.00234784 0.0439488 )
------------------------------------------------------------
# Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.213157e-01
Photon flux (15-150 keV) in 42.3 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 0.460 sec. to 1.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46924 ( -0.284923 0.289953 )
Norm@50keV : 5.02393E-03 ( -0.000951777 0.000944112 )
------------------------------------------------------------
# Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.7976 for 57 degrees of freedom
# Null hypothesis probability = 8.642404e-01
Photon flux (15-150 keV) in 1 sec: 0.622166 ( -0.113555 0.113683 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79164e-08 ( -9.81705e-09 1.00578e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.918519 ( -2.46993 1.66489 )
Epeak [keV] : 55.2510 ( -10.5201 28.7402 )
Norm@50keV : 9.72586E-02 ( -0.0976894 1.88228 )
------------------------------------------------------------
# Chi-Squared = 38.61 using 59 PHA bins.
# Reduced chi-squared = 0.6894 for 56 degrees of freedom
# Null hypothesis probability = 9.631467e-01
Photon flux (15-150 keV) in 1 sec: 0.576145 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9725e-08 ( -9.2114e-09 1.08071e-08 ) ergs/cm2
Band function
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.910622 ( -0.766642 1.52872 )
beta : -10.00000 ( 5.64083e+09 5.64083e+09 )
Epeak [keV] : 55.3314 ( -10.6453 28.6482 )
Norm@50keV : 9.61422E-02 ( -0.0966478 1.81768 )
------------------------------------------------------------
# Chi-Squared = 38.61 using 59 PHA bins.
# Reduced chi-squared = 0.7019 for 55 degrees of freedom
# Null hypothesis probability = 9.542241e-01
Photon flux (15-150 keV) in 1 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 Feb 9 07:13:19 EST 2011