batgrbproduct Analysis for Trigger=330856
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 v2.41
Process Start Time (local time): Tue Oct 7 16:45:14 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger330856/GCN5_download_cron
======================================================================
Trigger: 00330856 Segment: 000
BAT Trigger Time: 245049835.904 [s; MET]
Trigger Stop: 245049836.928 [s; MET]
UTC: 2008-10-07T05:23:52.748620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 339.976068527769 Dec: -40.1359411791978 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.43
Image Trigger?: NO
Rate S/N Ratio: 14.7309198626562 [ if not an image trigger ]
Image S/N Ratio: 9.43
Flight Position: [ source = BAT ]
RA: 339.976068527769 Dec: -40.1359411791978 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 339.967200669639 Dec: -40.1469012581133 [deg; J2000]
{ 22h 39m 52.1s , -40d 08' 48.8" }
+/- 1.46193353980221 [arcmin] (estimated 90% radius based on SNR)
+/- 0.659160593990842 [arcmin] (formal 1-sigma fit error)
SNR: 17.6810267100013
Angular difference between Flight and Ground position is 0.773231 arcmin
Partial Coding Fraction: 0.2890625 [ including projection effects ]
Duration
T90: 9.08799996972084 +/- 2.93713330647929
Measured from: -4.06399992108345
to: 5.02400004863739 [s; relative to TRIGTIME]
T50: 2.94399997591972 +/- 0.639999997615814
Measured from: 0.672000080347061
to: 3.61600005626678 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.707999974489212
to: 1.70799997448921 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.83200001716614
to: 6.783999979496 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.521500 0.576359 0.184595 0.027817
0.039960 0.039374 0.035472 0.033778 [error]
Peak 0.101881 0.102121 0.052667 0.021493
0.011992 0.011954 0.010433 0.009316 [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 2.42e-07 2.42e-07 1.70e-07 1.89e-07 7.27e-07 8.51e-07 erg/cm2
Error 2.92e-08 2.30e-08 3.25e-08 6.90e-08 7.52e-08 1.13e-07 erg/cm2
Peak flux Power-law 1.40e+00 8.93e-01 3.67e-01 2.05e-01 2.77e+00 2.87e+00 ph/cm2/s
Error 2.58e-01 1.15e-01 8.69e-02 9.16e-02 3.59e-01 3.67e-01 ph/cm2/s
Fluence Cutoff-PL 2.28e-07 2.63e-07 1.52e-07 4.61e-08 6.76e-07 6.94e-07 erg/cm2
Error 3.27e-08 3.08e-08 4.20e-08 8.12e-08 8.52e-08 1.23e-07 erg/cm2
Peak flux Cutoff-PL 1.38e+00 9.10e-01 3.67e-01 1.62e-01 2.75e+00 2.82e+00 ph/cm2/s
Error 2.85e-01 1.05e-01 9.12e-02 1.35e-01 3.70e-01 4.12e-01 ph/cm2/s
Fluence Band 2.25e-07 2.61e-07 1.52e-07 4.59e-08 6.74e-07 7.42e-07 erg/cm2
Error 3.23e-08 3.07e-08 4.18e-08 4.17e-08 8.51e-08 1.54e-07 erg/cm2
Peak flux Band 1.37e+00 9.15e-01 3.62e-01 1.87e-01 2.75e+00 2.83e+00 ph/cm2/s
Error 2.47e-01 1.46e-01 9.57e-02 1.23e-01 3.64e-01 4.05e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.509 0.197 - - 5.33e-03 7.38e-04 58.501 57
CPL 1.655 0.698 15.3 13.9 1.75e-02 3.46e-02 55.249 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.281 0.264 - - 1.60e-02 2.84e-03 55.681 57
CPL 1.941 0.000 7.4 4999.8 2.49e-02 6.38e-03 55.684 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 13.616 -6.832 6.784
T90 9.088 -4.064 5.024
T50 2.944 0.672 3.616
Peak 1.000 0.708 1.708
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
339.9672 -40.1469 0.0109 49.3 -164.5 1.4027 17.7 TRIG_00330856
------------------------------------------
Foreground time interval of the image:
-6.832 6.784 (delta_t = 13.616 [sec])
Background time interval of the image:
-204.603 -6.832 (delta_t = 197.771 [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 -6.832 sec. to 6.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50935 ( -0.189867 0.204134 )
Norm@50keV : 5.327214E-03 ( -7.441984E-04 7.323809E-04) )
------------------------------------------------------------
Chi-Squared = 58.50104 using 59 PHA bins.
Reduced chi-squared = 1.026334 for 57 degrees of freedom
Null hypothesis probability = 0.420
Photon flux (15-150 keV) in 13.62 sec: 1.05253 ( -0.094766 0.09488 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.27365e-07 ( -7.4451e-08 7.59478e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.832 sec. to 6.784 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.65507 ( -1.04648 0.349185 )
Epeak [keV] : 15.3213 ( -14.3914 13.4289 )
Norm@50keV : 1.754609E-02 ( -8.300636E-03 6.085702E-02) )
------------------------------------------------------------
Chi-Squared = 55.24881 using 59 PHA bins.
but latest trial 2.00426 gives Chi-Squared = 23.9739
but latest trial 0.840678 gives Chi-Squared = 5.21071
Reduced chi-squared = 0.9865859 for 56 degrees of freedom
Null hypothesis probability = 0.503
Photon flux (15-150 keV) in 13.62 sec: 1.01553 ( -0.100416 0.10066 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75754e-07 ( -8.22743e-08 8.81609e-08 ) ergs/cm2
Band function
Time interval is from -6.832 sec. to 6.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58348 ( -0.488923 0.562219 )
beta : -9.17753 ( -0.822468 6.69384 )
Epeak [keV] : 16.9445 ( -16.8445 11.5041 )
Norm@50keV : 1.946754E-02 ( -8.733143E-03 6.501795E-02) )
------------------------------------------------------------
Chi-Squared = 55.26675 using 59 PHA bins.
Reduced chi-squared = 1.004850 for 55 degrees of freedom
Null hypothesis probability = 0.465
Photon flux (15-150 keV) in 13.62 sec: 1.01548 ( -0.100369 0.10071 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74101e-07 ( -8.19624e-08 8.82249e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.704 sec. to 1.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28138 ( -0.250918 0.276803 )
Norm@50keV : 1.599751E-02 ( -2.890344E-03 2.782155E-03) )
------------------------------------------------------------
Chi-Squared = 55.68055 using 59 PHA bins.
Reduced chi-squared = 0.9768517 for 57 degrees of freedom
Null hypothesis probability = 0.525
Photon flux (15-150 keV) in 1.008 sec: 2.76703 ( -0.35826 0.35884 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53584e-07 ( -2.26346e-08 2.30903e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.704 sec. to 1.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94136 ( )
Epeak [keV] : 7.42180 ( -0.500185 9999.06 )
Norm@50keV : 2.492376E-02 ( -5.639868E-03 7.111156E-03) )
------------------------------------------------------------
Chi-Squared = 55.68405 using 59 PHA bins.
Reduced chi-squared = 0.9943580 for 56 degrees of freedom
Null hypothesis probability = 0.487
Photon flux (15-150 keV) in 1.008 sec: 2.74959 ( -0.37266 0.36675 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51584e-07 ( -2.56848e-08 2.47434e-08 ) ergs/cm2
Band function
Time interval is from 0.704 sec. to 1.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88030 ( -8.11970 6.88030 )
beta : -9.33146 ( -7.60790 0.357991 )
Epeak [keV] : 12.2240 ( -10.6616 29.2151 )
Norm@50keV : 2.746441E-02 ( -1.178004E-02 6.655122E-02) )
------------------------------------------------------------
Chi-Squared = 55.75839 using 59 PHA bins.
Reduced chi-squared = 1.013789 for 55 degrees of freedom
Null hypothesis probability = 0.446
Photon flux (15-150 keV) in 1.008 sec: 2.74834 ( -0.37204 0.35691 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51119e-07 ( -2.46053e-08 2.47131e-08 ) ergs/cm2
Plot creation:
Tue Oct 7 17:11:40 EDT 2008