batgrbproduct Analysis for Trigger=219101
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 Jan 1 20:31:00 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger219101/SDC
======================================================================
Trigger: 00219101 Segment: 000
BAT Trigger Time: 174582721.6 [s; MET]
Trigger Stop: 174582725.696 [s; MET]
UTC: 2006-07-14T15:12:00.283480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.871787334663 Dec: -6.54624612869117 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.78
Image Trigger?: NO
Rate S/N Ratio: 14.8660687473185 [ if not an image trigger ]
Image S/N Ratio: 8.78
Flight Position: [ source = BAT ]
RA: 227.871787334663 Dec: -6.54624612869117 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 227.858611630779 Dec: -6.54517527486174 [deg; J2000]
{ 15h 11m 26.1s , -06d 32' 42.6" }
+/- 1.57457553386248 [arcmin] (estimated 90% radius based on SNR)
+/- 0.529020858819836 [arcmin] (formal 1-sigma fit error)
SNR: 15.9021643855174
RA = 15h 11m 26.1s (227.858612 deg.)
Dec = -6d 32' 43" (-6.545175 deg.)
Angular difference between Flight and Ground position is 0.788013 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 114.988000005484 +/- 9.12936538358046
Measured from: -7.92800000309944
to: 107.060000002384 [s; relative to TRIGTIME]
T50: 85.7800000011921 +/- 3.58308526550072
Measured from: 4.80799999833107
to: 90.5879999995232 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 75.4399999976158
to: 76.4399999976158 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.727999985218
to: 120.636000007391 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.863998 2.014264 1.057119 0.287648
0.084404 0.084025 0.074036 0.064004 [error]
Peak 0.041468 0.066500 0.045726 0.005519
0.005595 0.005449 0.004736 0.003601 [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 6.42e-07 8.83e-07 8.96e-07 1.66e-06 2.95e-06 4.07e-06 erg/cm2
Error 5.71e-08 4.70e-08 7.55e-08 2.94e-07 1.71e-07 3.58e-07 erg/cm2
Peak flux Power-law 5.00e-01 4.73e-01 3.10e-01 3.16e-01 1.41e+00 1.60e+00 ph/cm2/s
Error 8.35e-02 4.95e-02 3.85e-02 7.86e-02 1.44e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 6.28e-07 8.97e-07 8.97e-07 1.29e-06 2.91e-06 3.68e-06 erg/cm2
Error 6.63e-08 5.81e-08 7.61e-08 6.30e-07 2.01e-07 6.80e-07 erg/cm2
Peak flux Cutoff-PL 4.17e-01 5.11e-01 3.38e-01 1.39e-01 1.36e+00 1.41e+00 ph/cm2/s
Error 1.02e-01 6.02e-02 4.69e-02 9.41e-02 1.49e-01 1.77e-01 ph/cm2/s
Fluence Band 6.07e-07 9.07e-07 8.76e-07 1.50e-06 2.90e-06 3.87e-06 erg/cm2
Error 7.22e-08 6.38e-08 8.16e-08 5.28e-07 1.89e-07 5.54e-07 erg/cm2
Peak flux Band 4.17e-01 5.11e-01 3.38e-01 1.39e-01 1.36e+00 1.41e+00 ph/cm2/s
Error 1.02e-01 6.02e-02 4.69e-02 9.34e-02 1.49e-01 1.77e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.978 0.106 - - 2.42e-03 1.46e-04 63.727 57
CPL 1.774 0.000 51.0 4994.1 3.11e-03 1.52e-03 63.391 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.607 0.166 - - 1.10e-02 1.10e-03 53.186 57
CPL 0.673 0.790 73.0 43.3 3.18e-02 3.41e-02 48.091 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: 108.864000 sec.
T50 in the 50-300 keV band: 81.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 132.364 -11.728 120.636
T90 114.988 -7.928 107.060
T50 85.780 4.808 90.588
Peak 1.000 75.440 76.440
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.8586 -6.5452 0.0120 33.6 65.0 2.2968 15.9 TRIG_00219101
------------------------------------------
Foreground time interval of the image:
-11.728 38.605 (delta_t = 50.333 [sec])
Background time interval of the image:
-239.600 -11.728 (delta_t = 227.872 [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 -11.728 sec. to 120.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97823 ( -0.105207 0.107068 )
Norm@50keV : 2.419719E-03 ( -1.462980E-04 1.447750E-04) )
------------------------------------------------------------
Chi-Squared = 63.72665 using 59 PHA bins.
Reduced chi-squared = 1.118011 for 57 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 132.4 sec: 0.359373 ( -0.020108 0.020172 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95155e-06 ( -1.71008e-07 1.71723e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.728 sec. to 120.636 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77359 ( )
Epeak [keV] : 50.9913 ( -39.7676 9948.40 )
Norm@50keV : 3.105669E-03 ( -1.082378E-03 1.949867E-03) )
------------------------------------------------------------
Chi-Squared = 63.39078 using 59 PHA bins.
but latest trial 11.8333 gives Chi-Squared = 0.491673
Reduced chi-squared = 1.131978 for 56 degrees of freedom
Null hypothesis probability = 0.232
Photon flux (15-150 keV) in 132.4 sec: 0.356168 ( -0.021863 0.021784 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91134e-06 ( -2.05683e-07 1.96627e-07 ) ergs/cm2
Band function
Time interval is from -11.728 sec. to 120.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31346 ( -8.68654 2.89941 )
beta : -2.07108 ( -7.92892 0.159970 )
Epeak [keV] : 34.4031 ( -34.3031 9965.60 )
Norm@50keV : 6.430210E-03 ( -5.282884E-02 334.462 )
------------------------------------------------------------
Chi-Squared = 62.12225 using 59 PHA bins.
Reduced chi-squared = 1.129496 for 55 degrees of freedom
Null hypothesis probability = 0.237
Photon flux (15-150 keV) in 132.4 sec: 0.352516 ( -0.022457 0.022165 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8951e-06 ( -1.93913e-07 1.8483e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 75.440 sec. to 76.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60677 ( -0.164457 0.167474 )
Norm@50keV : 1.097285E-02 ( -1.104191E-03 1.098984E-03) )
------------------------------------------------------------
Chi-Squared = 53.18605 using 59 PHA bins.
Reduced chi-squared = 0.9330885 for 57 degrees of freedom
Null hypothesis probability = 0.619
Photon flux (15-150 keV) in 1.000 sec: 1.41304 ( -0.14342 0.1438 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02591e-07 ( -1.09523e-08 1.0909e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 75.440 sec. to 76.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.672771 ( -0.858902 0.721212 )
Epeak [keV] : 72.9583 ( -15.2535 71.2795 )
Norm@50keV : 3.178870E-02 ( -1.753632E-02 5.074710E-02) )
------------------------------------------------------------
Chi-Squared = 48.09057 using 59 PHA bins.
Reduced chi-squared = 0.8587602 for 56 degrees of freedom
Null hypothesis probability = 0.765
Photon flux (15-150 keV) in 1.000 sec: 1.36061 ( -0.14887 0.14922 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.80081e-08 ( -1.16361e-08 1.16819e-08 ) ergs/cm2
Band function
Time interval is from 75.440 sec. to 76.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.675488 ( -0.718486 0.861959 )
beta : -8.87829 ( -1.12171 7.14547 )
Epeak [keV] : 73.0445 ( -14.4725 71.2094 )
Norm@50keV : 3.167962E-02 ( -1.825109E-02 5.085866E-02) )
------------------------------------------------------------
Chi-Squared = 48.09069 using 59 PHA bins.
Reduced chi-squared = 0.8743761 for 55 degrees of freedom
Null hypothesis probability = 0.734
Photon flux (15-150 keV) in 1.000 sec: 1.36087 ( -0.14937 0.14925 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79412e-08 ( -1.16376e-08 1.16678e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 20:51:35 EST 2008