batgrbproduct Analysis for Trigger=361830
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Fri Sep 4 14:20:08 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361830/GCN5_download_cron
======================================================================
Trigger: 00361830 Segment: 000
BAT Trigger Time: 273718872 [s; MET]
Trigger Stop: 273718936 [s; MET]
UTC: 2009-09-04T01:01:06.945020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 100.882120511926 Dec: 50.206547663391 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.83
Flight Position: [ source = BAT ]
RA: 100.882120511926 Dec: 50.206547663391 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 100.862200165166 Dec: 50.2191247769195 [deg; J2000]
{ 06h 43m 26.9s , +50d 13' 08.8" }
+/- 2.56084718969142 [arcmin] (estimated 90% radius based on SNR)
+/- 1.40597333568266 [arcmin] (formal 1-sigma fit error)
SNR: 7.93803748741872
Angular difference between Flight and Ground position is 1.074469 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 127.791999936104 +/- 9.36861675253685
Measured from: 49.1160001158714
to: 176.908000051975 [s; relative to TRIGTIME]
T50: 20.9519999027252 +/- 3.00975747726853
Measured from: 126.452000141144
to: 147.404000043869 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 127.068000018597
to: 128.068000018597 [s; relative to TRIGTIME]
Total Fluence
Measured from: 29.5199999809265
to: 186.308000028133 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.100561 2.179706 1.175162 0.092915
0.074973 0.078633 0.072188 0.071771 [error]
Peak 0.066264 0.088085 0.053581 0.019682
0.006502 0.007015 0.006140 0.005692 [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 6.80e-07 9.16e-07 9.07e-07 1.62e-06 3.03e-06 4.12e-06 erg/cm2
Error 5.08e-08 4.19e-08 7.11e-08 2.63e-07 1.58e-07 3.28e-07 erg/cm2
Peak flux Power-law 6.56e-01 6.24e-01 4.13e-01 4.25e-01 1.87e+00 2.12e+00 ph/cm2/s
Error 1.02e-01 5.85e-02 5.30e-02 1.13e-01 1.70e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 6.51e-07 9.45e-07 8.96e-07 9.02e-07 2.92e-06 3.39e-06 erg/cm2
Error 5.92e-08 5.22e-08 7.64e-08 5.80e-07 1.96e-07 5.58e-07 erg/cm2
Peak flux Cutoff-PL 6.56e-01 6.24e-01 4.13e-01 4.22e-01 1.87e+00 2.11e+00 ph/cm2/s
Error 1.02e-01 5.85e-02 5.30e-02 1.12e-01 1.70e-01 1.95e-01 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 2.014 0.095 - - 2.09e-03 1.16e-04 46.800 57
CPL 1.666 0.376 42.0 0.0 3.25e-03 0.00e+00 44.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.595 0.171 - - 1.45e-02 1.41e-03 57.130 57
CPL 1.602 0.176 9999.4 0.0 1.45e-02 1.07e-02 57.150 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: 49.600000 sec.
T50 in the 50-300 keV band: 16.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 156.788 29.520 186.308
T90 127.792 49.116 176.908
T50 20.952 126.452 147.404
Peak 1.000 127.068 128.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
100.8622 +50.2191 0.0243 29.5 12.2 0.7506 7.9 TRIG_00361830
------------------------------------------
Foreground time interval of the image:
29.520 71.201 (delta_t = 41.681 [sec])
Background time interval of the image:
-136.599 29.520 (delta_t = 166.119 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 29.520 sec. to 186.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01380 ( -0.0939496 0.0957877 )
Norm@50keV : 2.09355E-03 ( -0.000116133 0.000114975 )
------------------------------------------------------------
# Chi-Squared = 46.80 using 59 PHA bins.
# Reduced chi-squared = 0.8210 for 57 degrees of freedom
# Null hypothesis probability = 8.304452e-01
Photon flux (15-150 keV) in 156.8 sec: 0.316043 ( -0.0150089 0.0150426 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0296e-06 ( -1.57618e-07 1.59047e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 29.520 sec. to 186.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66643 ( -0.388252 0.364226 )
Epeak [keV] : 42.0277 ( )
Norm@50keV : 3.24655E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.20 using 59 PHA bins.
# Reduced chi-squared = 0.7893 for 56 degrees of freedom
# Null hypothesis probability = 8.729123e-01
Photon flux (15-150 keV) in 156.8 sec: 0.308895 ( -0.016675 0.016655 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91534e-06 ( -1.95545e-07 1.97411e-07 ) ergs/cm2
Band function
Time interval is from 29.520 sec. to 186.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.261113 ( 1.76452 0.504048 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 1.46284 ( )
Norm@50keV : 9.18579E-20 ( )
------------------------------------------------------------
# Chi-Squared = 472.91 using 59 PHA bins.
# Reduced chi-squared = 8.5984 for 55 degrees of freedom
# Null hypothesis probability = 8.802498e-68
Photon flux (15-150 keV) in 156.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 127.068 sec. to 128.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59532 ( -0.170176 0.172574 )
Norm@50keV : 1.45461E-02 ( -0.0014206 0.00140156 )
------------------------------------------------------------
# Chi-Squared = 57.13 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.704291e-01
Photon flux (15-150 keV) in 1 sec: 1.86655 ( -0.170194 0.170454 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36115e-07 ( -1.44132e-08 1.46038e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 127.068 sec. to 128.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60210 ( -0.185385 0.165945 )
Epeak [keV] : 9999.36 ( -9999.79 -9999.79 )
Norm@50keV : 1.45045E-02 ( -0.0145559 0.00691972 )
------------------------------------------------------------
# Chi-Squared = 57.15 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.322205e-01
Photon flux (15-150 keV) in 1 sec: 1.86583 ( -0.17013 0.1704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36105e-07 ( -1.4416e-08 1.4606e-08 ) ergs/cm2
Band function
Time interval is from 127.068 sec. to 128.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17121 ( 1.17121 1.17121 )
beta : -1.60495 ( 1.60495 0.179415 )
Epeak [keV] : 46.3647 ( -46.3643 -46.3643 )
Norm@50keV : 3.07500E-02 ( -0.0175664 109.407 )
------------------------------------------------------------
# Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.965447e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Sep 4 14:43:08 EDT 2009