batgrbproduct Analysis for Trigger=503525
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): Mon Oct 3 16:40:40 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger503525/batgroup_hand_proc
======================================================================
Trigger: 00503525 Segment: 000
BAT Trigger Time: 338159778.916 [s; MET]
Trigger Stop: 338159778.96 [s; MET]
UTC: 2011-09-19T21:16:11.533640 [includes UTCF correction]
Where From?: Command line
BAT
RA: 251.75181767584 Dec: -45.8429090422137 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.03
Image Trigger?: NO
Rate S/N Ratio: 13.9642400437689 [ if not an image trigger ]
Image S/N Ratio: 7.03
Flight Position: [ source = EXTERNAL ]
RA: 251.7189 Dec: -45.8334 [deg; J2000]
Partial Coding Fraction: 1.015625 [ including projection effects ]
Angular difference between Flight and Ground position is 0.000000 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 29.1360000371933 +/- 6.5942762958167
Measured from: -29.1319999098778
to: 0.00400012731552124 [s; relative to TRIGTIME]
T50: 11.5199999809265 +/- 12.8135178662698
Measured from: -18.3159998655319
to: -6.79599988460541 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -5.56000000238419
to: -4.56000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.2200000286102
to: 0.0519999861717224 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.207284 0.106714 0.011935 0.025590
0.035913 0.031858 0.027511 0.025562 [error]
Peak 0.022858 0.004590 0.005325 0.002083
0.006253 0.005463 0.004549 0.004464 [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 1.54e-09 3.53e-10 4.11e-11 5.33e-12 1.94e-09 1.94e-09 erg/cm2
Error 5.46e-10 1.47e-10 3.00e-11 7.21e-12 6.65e-10 6.66e-10 erg/cm2
Peak flux Power-law 1.83e-01 7.41e-02 1.77e-02 5.12e-03 2.77e-01 2.79e-01 ph/cm2/s
Error 9.05e-02 4.86e-02 2.55e-02 1.78e-02 1.28e-01 1.30e-01 ph/cm2/s
Fluence Cutoff-PL 3.35e-09 1.58e-09 2.04e-12 6.75e-21 4.94e-09 4.93e-09 erg/cm2
Error 7.72e-10 5.00e-10 2.38e-12 1.10e-19 1.08e-09 1.08e-09 erg/cm2
Peak flux Cutoff-PL 1.82e-01 7.40e-02 1.76e-02 5.39e-03 9.36e-06 2.78e-01 ph/cm2/s
Error 9.04e-02 5.29e-02 3.23e-03 1.28e-01 1.00e-01 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 5.104 0.639 - - 8.16e-04 4.98e-04 86.710 57
CPL 1.000 0.000 50.0 0.0 1.84e-03 0.00e+00 107.280 56
The chi2 of BB fit is 67.23 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 3.068 1.429 - - 9.60e-04 1.07e-03 65.100 57
CPL 1.000 0.000 50.0 0.0 5.07e-03 0.00e+00 69.190 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 34.272 -34.220 0.052
T90 29.136 -29.132 0.004
T50 11.520 -18.316 -6.796
Peak 1.000 -5.560 -4.560
Image
Pre-slew 15.0-50.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.7189 -45.8334 0.0281 10.3313 -167.6020 0.0166700 6.825 TRIG_00503525
Foreground time interval of the image:
0.000 0.044 (delta_t = 0.044 [sec])
Background time interval of the image:
-10.004 -2.004 (delta_t = 8.000 [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 0.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.10385 ( -0.569206 0.708552 )
Norm@50keV : 8.15726E-04 ( -0.000460017 0.000536343 )
------------------------------------------------------------
# Chi-Squared = 86.71 using 59 PHA bins.
# Reduced chi-squared = 1.521 for 57 degrees of freedom
# Null hypothesis probability = 6.792281e-03
Photon flux (15-150 keV) in 0.044 sec: 1.38970 ( -0.482154 0.482029 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94212e-09 ( -6.651e-10 6.651e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.84439E-03 ( )
------------------------------------------------------------
# Chi-Squared = 107.28 using 59 PHA bins.
# Reduced chi-squared = 1.9157 for 56 degrees of freedom
# Null hypothesis probability = 4.501839e-05
Photon flux (15-150 keV) in 0.044 sec: 3.19047 ( -0.69751 0.69762 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93601e-09 ( -1.08158e-09 1.07963e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.98125 ( 230.875 240.711 )
beta : -5.09153 ( -0.774821 0.502485 )
Epeak [keV] : 79.4819 ( -79.4819 -79.4819 )
Norm@50keV : 0.112059 ( -0.0633738 0.0720586 )
------------------------------------------------------------
# Chi-Squared = 86.71 using 59 PHA bins.
# Reduced chi-squared = 1.577 for 55 degrees of freedom
# Null hypothesis probability = 4.094432e-03
Photon flux (15-150 keV) in 0.044 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] : 3.82554 (-0.367766 0.326751)
R^2/D10^2 : 85.9796 (-38.5192 68.4795)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.23 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.665139e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.761e-09 8.787e-10
25- 50 8.760e-10 3.329e-10
50-150 8.084e-12 6.562e-12
15-150 3.645e-09 1.209e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.19870 (-1.18366 1.21909)
Norm : 150.302 (-67.4699 108.528)
------------------------------------------------------------
# Chi-Squared = 76.42 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 57 degrees of freedom
# Null hypothesis probability = 4.393459e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.239e-09 8.956e-10
25- 50 5.835e-10 2.484e-10
50-150 1.431e-11 1.182e-11
15-150 2.837e-09 1.001e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.80882 (-3.83392 196.15)
R1^2/D10^2 : 32.1379 (-32.1797 -32.1797)
kT2 [keV] : 3.83319 (-3.82237 196.154)
R2^2/D10^2 : 54.0093 (-54.0547 -54.0547)
------------------------------------------------------------
# Chi-Squared = 67.23 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 55 degrees of freedom
# Null hypothesis probability = 1.246066e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.761e-09 3.969e-01
25- 50 8.752e-10 4.143e+00
50-150 8.063e-12 8.897e+01
15-150 3.644e-09 9.555e+01
Peak spectrum fit
Power-law model
Time interval is from -5.560 sec. to -4.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.06801 ( -1.11993 1.7371 )
Norm@50keV : 9.59707E-04 ( -0.000959707 0.00117867 )
------------------------------------------------------------
# Chi-Squared = 65.10 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.156610e-01
Photon flux (15-150 keV) in 1 sec: 0.277424 ( -0.127132 0.128373 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19066e-08 ( -6.46889e-09 8.38055e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.560 sec. to -4.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.07320E-03 ( )
------------------------------------------------------------
# Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 56 degrees of freedom
# Null hypothesis probability = 1.108914e-01
Photon flux (15-150 keV) in 1 sec: 0.277684 ( -0.127463 0.127659 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.61819e-09 ( -5.13658e-09 1.0532e-08 ) ergs/cm2
Band function
Time interval is from -5.560 sec. to -4.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.48708 ( 1.47728 1.47728 )
beta : -3.54222 ( 3.22242 1.23886 )
Epeak [keV] : 16.6444 ( -8.1098 450.755 )
Norm@50keV : 332.323 ( -509.313 3.36156e+06 )
------------------------------------------------------------
# Chi-Squared = 64.50 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.784971e-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] : 4.58017 (-1.85441 2.90126)
R^2/D10^2 : 3.55546 (-3.55565 52.3058)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 65.12 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.149975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.007e-09 3.943e-09
25- 50 3.140e-09 2.116e-09
50-150 8.196e-11 8.535e-11
15-150 9.228e-09 5.920e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1670 (-8.55337 40.3849)
Norm : 5.30827 (-5.30823 27.4298)
------------------------------------------------------------
# Chi-Squared = 65.07 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.163342e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.756e-09 3.744e-09
25- 50 3.706e-09 2.550e-09
50-150 5.803e-10 6.175e-10
15-150 1.004e-08 7.115e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.29994 (-4.29994 2.79743)
R1^2/D10^2 : 4.65378 (-4.65387 -4.65387)
kT2 [keV] : 46.7712 (-46.7707 -46.7707)
R2^2/D10^2 : 2.87280E-04 (-0.000287291 -0.000287291)
------------------------------------------------------------
# Chi-Squared = 64.31 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.828920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.016e-09 3.563e-09
25- 50 3.139e-09 2.006e-09
50-150 5.917e-09 3.103e-09
15-150 1.507e-08 8.465e-09
Plot creation:
Mon Oct 3 17:32:47 EDT 2011