batgrbproduct Analysis for Trigger=339696
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 v2.42
Process Start Time (local time): Mon Jan 12 10:46:03 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger339696/GCN5_download_cron
======================================================================
Trigger: 00339696 Segment: 000
BAT Trigger Time: 253411106.112 [s; MET]
Trigger Stop: 253411107.136 [s; MET]
UTC: 2009-01-11T23:58:21.703320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.645117762436 Dec: 0.0910882533427581 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.11
Image Trigger?: NO
Rate S/N Ratio: 10.2469507659596 [ if not an image trigger ]
Image S/N Ratio: 7.11
Flight Position: [ source = BAT ]
RA: 251.645117762436 Dec: 0.0910882533427581 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.656572607988 Dec: 0.0635503769624121 [deg; J2000]
{ 16h 46m 37.6s , +00d 03' 48.8" }
+/- 1.50323259723209 [arcmin] (estimated 90% radius based on SNR)
+/- 0.533004693495734 [arcmin] (formal 1-sigma fit error)
SNR: 16.991191330688
Angular difference between Flight and Ground position is 1.789517 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 24.9160000085831 +/- 2.6171679208201
Measured from: -1.6839998960495
to: 23.2320001125336 [s; relative to TRIGTIME]
T50: 13.527999997139 +/- 1.36540836823541
Measured from: 1.91600009799004
to: 15.444000095129 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.7040000259876
to: 11.7040000259876 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.87999999523163
to: 25.5840000212193 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.536295 0.474858 0.174693 0.043766
0.032798 0.030550 0.026804 0.024843 [error]
Peak 0.033338 0.038862 0.022473 0.011306
0.006657 0.006138 0.005337 0.004823 [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 1.78e-07 1.96e-07 1.54e-07 1.99e-07 6.02e-07 7.24e-07 erg/cm2
Error 1.92e-08 1.59e-08 2.48e-08 6.21e-08 5.56e-08 9.23e-08 erg/cm2
Peak flux Power-law 3.50e-01 2.89e-01 1.62e-01 1.34e-01 8.59e-01 9.34e-01 ph/cm2/s
Error 9.79e-02 5.19e-02 4.57e-02 7.56e-02 1.55e-01 1.69e-01 ph/cm2/s
Fluence Cutoff-PL 1.71e-07 2.08e-07 1.42e-07 6.66e-08 5.63e-07 5.84e-07 erg/cm2
Error 2.13e-08 2.12e-08 3.15e-08 1.46e-07 6.88e-08 1.33e-07 erg/cm2
Peak flux Cutoff-PL 3.49e-01 2.89e-01 1.62e-01 1.33e-01 8.59e-01 9.33e-01 ph/cm2/s
Error 9.79e-02 5.19e-02 4.58e-02 7.51e-02 1.55e-01 1.69e-01 ph/cm2/s
Fluence Band 1.86e-07 2.05e-07 1.62e-07 2.09e-07 6.32e-07 6.71e-07 erg/cm2
Error 1.79e-07 2.50e-07 2.52e-07 5.61e-07 3.09e-07 0.00e+00 erg/cm2
Peak flux Band 3.49e-01 2.89e-01 1.62e-01 1.33e-01 8.59e-01 9.33e-01 ph/cm2/s
Error 9.79e-02 5.19e-02 3.46e-02 8.00e-02 1.16e-01 1.70e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.350 0.169 - - 2.38e-03 2.74e-04 52.958 57
CPL 1.885 0.786 9.3 15.1 4.59e-03 9.20e-03 51.061 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.835 0.348 - - 6.15e-03 1.31e-03 52.877 57
CPL 1.735 0.000 118.2 5000.0 6.97e-03 1.49e-02 52.922 0
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 28.464 -2.880 25.584
T90 24.916 -1.684 23.232
T50 13.528 1.916 15.444
Peak 1.000 10.704 11.704
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.6566 +0.0636 0.0112 25.1 -140.0 0.9500 17.0 TRIG_00339696
------------------------------------------
Foreground time interval of the image:
-2.880 17.218 (delta_t = 20.098 [sec])
Background time interval of the image:
-239.112 -181.072 (delta_t = 58.040 [sec])
-180.112 -55.950 (delta_t = 124.162 [sec])
-55.112 -2.880 (delta_t = 52.232 [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
Multiple GTIs in the spectrum
tstart tstop
-2.880000 17.218000
17.888000 18.338000
19.888000 25.584000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.34980 ( -0.164537 0.173573 )
Norm@50keV : 2.379160E-03 ( -2.757425E-04 2.720731E-04) )
------------------------------------------------------------
Chi-Squared = 52.95837 using 59 PHA bins.
Reduced chi-squared = 0.9290941 for 57 degrees of freedom
Null hypothesis probability = 0.627
Photon flux (15-150 keV) in 26.24 sec: 0.427613 ( -0.033155 0.03318 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.02337e-07 ( -5.49229e-08 5.62454e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-2.880000 17.218000
17.888000 18.338000
19.888000 25.584000
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88534 ( -0.989905 0.581659 )
Epeak [keV] : 9.26378 ( -8.81712 21.3092 )
Norm@50keV : 4.585962E-03 ( -4.585962E-03 1.380641E-02) )
------------------------------------------------------------
Chi-Squared = 51.06142 using 59 PHA bins.
but latest trial -0.204669 gives Chi-Squared = 204.828
Reduced chi-squared = 0.9118110 for 56 degrees of freedom
Null hypothesis probability = 0.662
Photon flux (15-150 keV) in 26.24 sec: 0.415689 ( -0.0358 0.03591 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63352e-07 ( -6.56131e-08 7.19055e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-2.880000 17.218000
17.888000 18.338000
19.888000 25.584000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59867 ( -8.40133 5.98374 )
beta : -9.29568 ( -7.14542 0.583481 )
Epeak [keV] : 20.0060 ( -18.6983 11.7769 )
Norm@50keV : 6.825867E-03 ( -3.020309E-03 409.183 )
------------------------------------------------------------
Chi-Squared = 51.11050 using 59 PHA bins.
Reduced chi-squared = 0.9292818 for 55 degrees of freedom
Null hypothesis probability = 0.624
Photon flux (15-150 keV) in 26.24 sec: 0.416160 ( -0.036083 0.035907 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32497e-07 ( -5.98902e-08 1.06235e-06 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 10.704 sec. to 11.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83531 ( -0.336007 0.360093 )
Norm@50keV : 6.149300E-03 ( -1.336245E-03 1.280108E-03) )
------------------------------------------------------------
Chi-Squared = 52.87721 using 59 PHA bins.
Reduced chi-squared = 0.9276704 for 57 degrees of freedom
Null hypothesis probability = 0.630
Photon flux (15-150 keV) in 1.000 sec: 0.859238 ( -0.154927 0.155112 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65908e-08 ( -1.20156e-08 1.2324e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.704 sec. to 11.704 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73458 ( )
Epeak [keV] : 118.207 ( -60.7080 9939.28 )
Norm@50keV : 6.968790E-03 ( -1.596809E-03 2.826476E-02) )
------------------------------------------------------------
Chi-Squared = 52.92163 using 59 PHA bins.
but latest trial 2.633336E-03 gives Chi-Squared = 12.0411
Reduced chi-squared = 0.9450291 for 56 degrees of freedom
Null hypothesis probability = 0.592
Photon flux (15-150 keV) in 1.000 sec: 0.858927 ( -0.154871 0.155053 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65387e-08 ( -1.19631e-08 1.23767e-08 ) ergs/cm2
Band function
Time interval is from 10.704 sec. to 11.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48675 ( -8.51325 6.48675 )
beta : -1.83536 ( -8.16464 0.336479 )
Epeak [keV] : 22.8101 ( -22.7101 9977.19 )
Norm@50keV : 1.311030E-02 ( -1.311030E-02 8.60845 )
------------------------------------------------------------
Chi-Squared = 52.87740 using 59 PHA bins.
Reduced chi-squared = 0.9614072 for 55 degrees of freedom
Null hypothesis probability = 0.556
Photon flux (15-150 keV) in 1.000 sec: 0.858927 ( -0.154871 0.077503 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68094e-08 ( -1.03287e-08 1.01609e-08 ) ergs/cm2
Plot creation:
Mon Jan 12 11:14:27 EST 2009