batgrbproduct Analysis for Trigger=353728
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 v2.45
Process Start Time (local time): Tue Aug 11 09:01:55 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/353728
======================================================================
Trigger: 00353728 Segment: 000
BAT Trigger Time: 265487760.96 [s; MET]
Trigger Stop: 265487761.984 [s; MET]
UTC: 2009-05-31T18:35:56.171780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.064493860549 Dec: -36.0245188355297 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.06
Image Trigger?: NO
Rate S/N Ratio: 48.4148737476408 [ if not an image trigger ]
Image S/N Ratio: 11.06
Flight Position: [ source = BAT ]
RA: 252.064493860549 Dec: -36.0245188355297 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.050688969081 Dec: -36.037127031726 [deg; J2000]
{ 16h 48m 12.2s , -36d 02' 13.7" }
+/- 1.63198880865965 [arcmin] (estimated 90% radius based on SNR)
+/- 0.668315481024165 [arcmin] (formal 1-sigma fit error)
SNR: 15.1090340389334
Angular difference between Flight and Ground position is 1.010429 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 54.9959999918938 +/- 6.13174035585667
Measured from: 0.439999997615814
to: 55.4359999895096 [s; relative to TRIGTIME]
T50: 35.9600000083447 +/- 13.3353342529601
Measured from: 1.60400000214577
to: 37.5640000104904 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.25
to: 1.25 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.252000004053116
to: 56.1319999992847 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.345998 0.326109 0.291201 0.099008
0.041058 0.038554 0.032767 0.027373 [error]
Peak 0.049431 0.071160 0.087575 0.033764
0.006105 0.006183 0.006147 0.005355 [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 8.40e-08 1.53e-07 2.14e-07 6.25e-07 6.13e-07 1.08e-06 erg/cm2
Error 1.68e-08 1.77e-08 3.29e-08 2.16e-07 7.75e-08 2.39e-07 erg/cm2
Peak flux Power-law 3.73e-01 5.21e-01 5.37e-01 1.01e+00 1.75e+00 2.45e+00 ph/cm2/s
Error 6.52e-02 5.30e-02 4.82e-02 2.11e-01 1.42e-01 2.31e-01 ph/cm2/s
Fluence Cutoff-PL 8.43e-08 1.53e-07 2.13e-07 6.16e-07 6.10e-07 1.08e-06 erg/cm2
Error 1.68e-08 1.74e-08 3.25e-08 2.23e-07 7.74e-08 2.11e-07 erg/cm2
Peak flux Cutoff-PL 3.74e-01 5.21e-01 5.37e-01 1.01e+00 1.75e+00 2.44e+00 ph/cm2/s
Error 6.58e-02 5.30e-02 4.84e-02 3.17e-01 1.41e-01 2.85e-01 ph/cm2/s
Fluence Band 8.50e-08 1.52e-07 2.14e-07 6.29e-07 6.14e-07 1.17e-06 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 3.73e-01 5.21e-01 5.38e-01 1.01e+00 1.75e+00 2.44e+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 1.516 0.214 - - 1.16e-03 1.31e-04 57.260 57
CPL 2.240 0.000 87.5 0.0 5.05e-04 0.00e+00 56.110 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 0.955 0.153 - - 1.53e-02 1.22e-03 64.490 57
CPL 0.955 0.155 9999.4 0.0 1.53e-02 3.49e-03 64.530 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: 110.784000 sec.
T50 in the 50-300 keV band: 61.568000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 55.880 0.252 56.132
T90 54.996 0.440 55.436
T50 35.960 1.604 37.564
Peak 1.000 0.250 1.250
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.0507 -36.0371 0.0128 12.6 11.9 1.1103 15.1 TRIG_00353728
------------------------------------------
Foreground time interval of the image:
0.252 56.132 (delta_t = 55.880 [sec])
Background time interval of the image:
-620.859 -588.914 (delta_t = 31.945 [sec])
-239.960 0.252 (delta_t = 240.212 [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 0.252 sec. to 56.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51634 ( -0.213741 0.214956 )
Norm@50keV : 1.15970E-03 ( -0.000132125 0.000130725 )
------------------------------------------------------------
# Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.655230e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145422 ( -0.0163011 0.0163596 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13154e-07 ( -7.70088e-08 7.80141e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.252 sec. to 56.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24007 ( )
Epeak [keV] : 87.5403 ( )
Norm@50keV : 5.04593E-04 ( )
------------------------------------------------------------
# Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.708941e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145393 ( -0.016189 0.016294 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10489e-07 ( -7.43808e-08 8.04672e-08 ) ergs/cm2
Band function
Time interval is from 0.252 sec. to 56.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95632 ( -45.7208 -45.7208 )
beta : -1.54796 ( -0.237346 0.226469 )
Epeak [keV] : 21.1635 ( -21.156 5.2831 )
Norm@50keV : 322.855 ( -323.94 66477 )
------------------------------------------------------------
# Chi-Squared = 57.13 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Null hypothesis probability = 3.959459e-01
Photon flux (15-150 keV) in 55.88 sec: 4.36489 ( -4.36489 4974.54 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13719e-07 ( -6.93102e-08 6.68604e-08 ) 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 0.250 sec. to 1.250 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.954544 ( -0.154676 0.151851 )
Norm@50keV : 1.52568E-02 ( -0.00122264 0.00122006 )
------------------------------------------------------------
# Chi-Squared = 64.49 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.313518e-01
Photon flux (15-150 keV) in 1 sec: 1.75311 ( -0.141646 0.141904 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67722e-07 ( -1.52321e-08 1.5363e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.955344 ( -0.161505 0.14756 )
Epeak [keV] : 9999.36 ( -9999.96 -9999.96 )
Norm@50keV : 1.53287E-02 ( -0.0012178 0.00576915 )
------------------------------------------------------------
# Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.031221e-01
Photon flux (15-150 keV) in 1 sec: 1.75291 ( -0.14099 0.14121 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67774e-07 ( -1.5271e-08 1.5287e-08 ) ergs/cm2
Band function
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.849212 ( 0.849242 0.849242 )
beta : -0.954536 ( -0.151887 0.154665 )
Epeak [keV] : 30.5560 ( -30.5017 -30.5017 )
Norm@50keV : 2.29671E-02 ( -0.00862299 2.21647 )
------------------------------------------------------------
# Chi-Squared = 64.49 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.788222e-01
Photon flux (15-150 keV) in 1 sec: 1.75252 ( -0.14175 0.07159 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67568e-07 ( -1.5178e-08 1.5421e-08 ) 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 May 27 11:00:34 EDT 2011