batgrbproduct Analysis for Trigger=231362
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): Wed Jan 2 06:49:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger231362/SDC
======================================================================
Trigger: 00231362 Segment: 000
BAT Trigger Time: 181058856.768 [s; MET]
Trigger Stop: 181058857.024 [s; MET]
UTC: 2006-09-27T14:07:35.297340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 329.55252602015 Dec: 5.35273339381842 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.06
Image Trigger?: NO
Rate S/N Ratio: 32.1403173599764 [ if not an image trigger ]
Image S/N Ratio: 12.06
Flight Position: [ source = BAT ]
RA: 329.55252602015 Dec: 5.35273339381842 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 329.553390820988 Dec: 5.36481070497339 [deg; J2000]
{ 21h 58m 12.8s , +05d 21' 53.3" }
+/- 0.893793559286184 [arcmin] (estimated 90% radius based on SNR)
+/- 0.221093290972256 [arcmin] (formal 1-sigma fit error)
SNR: 35.7091483983897
RA = 21h 58m 12.8s (329.553391 deg.)
Dec = 5d 21' 53" (5.364811 deg.)
Angular difference between Flight and Ground position is 0.726478 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 22.5439999997616 +/- 1.29427663430184
Measured from: -0.0879999995231628
to: 22.4560000002384 [s; relative to TRIGTIME]
T50: 15.8120000064373 +/- 5.23756429156354
Measured from: 1.0639999806881
to: 16.8759999871254 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.167999982833862
to: 1.16799998283386 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.976000010967255
to: 23.7520000040531 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.566850 0.835548 0.503177 0.065176
0.026650 0.027630 0.024567 0.020697 [error]
Peak 0.070481 0.129684 0.124662 0.029758
0.006111 0.007091 0.006755 0.004988 [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 1.90e-07 3.19e-07 4.07e-07 1.04e-06 1.20e-06 1.96e-06 erg/cm2
Error 1.46e-08 1.46e-08 2.44e-08 1.35e-07 5.79e-08 1.53e-07 erg/cm2
Peak flux Power-law 6.64e-01 8.53e-01 8.02e-01 1.33e+00 2.76e+00 3.65e+00 ph/cm2/s
Error 7.76e-02 6.11e-02 5.26e-02 1.85e-01 1.68e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.69e-07 3.41e-07 4.18e-07 3.89e-07 1.13e-06 1.31e-06 erg/cm2
Error 1.78e-08 1.84e-08 2.73e-08 1.77e-07 6.78e-08 1.87e-07 erg/cm2
Peak flux Cutoff-PL 5.52e-01 8.95e-01 8.78e-01 6.90e-01 2.70e+00 3.02e+00 ph/cm2/s
Error 9.67e-02 6.99e-02 6.93e-02 2.54e-01 1.72e-01 3.01e-01 ph/cm2/s
Fluence Band 1.61e-07 3.49e-07 3.97e-07 7.33e-07 1.14e-06 1.62e-06 erg/cm2
Error 1.89e-08 1.93e-08 3.15e-08 3.05e-07 6.48e-08 3.15e-07 erg/cm2
Peak flux Band 5.52e-01 8.95e-01 8.78e-01 6.91e-01 2.70e+00 3.02e+00 ph/cm2/s
Error 9.67e-02 6.99e-02 6.93e-02 2.54e-01 1.72e-01 3.01e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.649 0.081 - - 5.24e-03 2.37e-04 70.451 57
CPL 0.919 0.378 72.0 17.6 1.23e-02 5.68e-03 57.516 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.090 0.100 - - 2.39e-02 1.41e-03 65.532 57
CPL 0.339 0.462 125.4 60.5 5.23e-02 2.58e-02 56.278 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: 22.976000 sec.
T50 in the 50-300 keV band: 5.888000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.728 -0.976 23.752
T90 22.544 -0.088 22.456
T50 15.812 1.064 16.876
Peak 1.000 0.168 1.168
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
329.5534 +5.3648 0.0054 16.6 -97.7 1.4764 35.7 TRIG_00231362
------------------------------------------
Foreground time interval of the image:
-0.976 13.237 (delta_t = 14.213 [sec])
Background time interval of the image:
-239.768 -0.976 (delta_t = 238.792 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.976 sec. to 23.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64916 ( -8.025515E-02 8.074760E-02) )
Norm@50keV : 5.238645E-03 ( -2.372428E-04 2.363506E-04) )
------------------------------------------------------------
Chi-Squared = 70.45123 using 59 PHA bins.
Reduced chi-squared = 1.235986 for 57 degrees of freedom
Null hypothesis probability = 0.109
Photon flux (15-150 keV) in 24.73 sec: 0.683849 ( -0.031218 0.031285 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20493e-06 ( -5.77e-08 5.80809e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.976 sec. to 23.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.919249 ( -0.394862 0.360644 )
Epeak [keV] : 72.0090 ( -10.6585 24.5726 )
Norm@50keV : 1.234673E-02 ( -4.195572E-03 7.172773E-03) )
------------------------------------------------------------
Chi-Squared = 57.51606 using 59 PHA bins.
Reduced chi-squared = 1.027072 for 56 degrees of freedom
Null hypothesis probability = 0.419
Photon flux (15-150 keV) in 24.73 sec: 0.656058 ( -0.033811 0.033865 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13352e-06 ( -6.79383e-08 6.76118e-08 ) ergs/cm2
Band function
Time interval is from -0.976 sec. to 23.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.673647E-02 ( -0.990770 1.79648 )
beta : -1.94825 ( -0.945533 0.178137 )
Epeak [keV] : 47.3727 ( -11.7346 31.2289 )
Norm@50keV : 4.240099E-02 ( -3.204604E-02 0.758353 )
------------------------------------------------------------
Chi-Squared = 55.11765 using 59 PHA bins.
Reduced chi-squared = 1.002139 for 55 degrees of freedom
Null hypothesis probability = 0.470
Photon flux (15-150 keV) in 24.73 sec: 0.652524 ( -0.035149 0.033087 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14478e-06 ( -6.58807e-08 6.37267e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09008 ( -0.100892 9.989464E-02) )
Norm@50keV : 2.385785E-02 ( -1.414252E-03 1.413595E-03) )
------------------------------------------------------------
Chi-Squared = 65.53246 using 59 PHA bins.
Reduced chi-squared = 1.149692 for 57 degrees of freedom
Null hypothesis probability = 0.205
Photon flux (15-150 keV) in 1.000 sec: 2.76477 ( -0.16811 0.16825 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50232e-07 ( -1.6159e-08 1.6256e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.339320 ( -0.485682 0.437394 )
Epeak [keV] : 125.354 ( -28.6024 92.3369 )
Norm@50keV : 5.232307E-02 ( -1.880931E-02 3.286796E-02) )
------------------------------------------------------------
Chi-Squared = 56.27751 using 59 PHA bins.
Reduced chi-squared = 1.004956 for 56 degrees of freedom
Null hypothesis probability = 0.464
Photon flux (15-150 keV) in 1.000 sec: 2.70191 ( -0.17241 0.17235 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43437e-07 ( -1.7227e-08 1.7202e-08 ) ergs/cm2
Band function
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.341182 ( -0.435527 0.488360 )
beta : -8.79810 ( -1.20190 5.82416 )
Epeak [keV] : 125.533 ( -28.8021 92.1022 )
Norm@50keV : 5.221637E-02 ( -1.870509E-02 3.299355E-02) )
------------------------------------------------------------
Chi-Squared = 56.27760 using 59 PHA bins.
Reduced chi-squared = 1.023229 for 55 degrees of freedom
Null hypothesis probability = 0.427
Photon flux (15-150 keV) in 1.000 sec: 2.70210 ( -0.17257 0.17225 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43311e-07 ( -1.7225e-08 1.7182e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 07:13:48 EST 2008