batgrbproduct Analysis for Trigger=106442
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): Fri Jan 4 21:09:15 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger106442/SDC
======================================================================
Trigger: 00106442 Segment: 000
BAT Trigger Time: 130539950.656 [s; MET]
Trigger Stop: 130539951.68 [s; MET]
UTC: 2005-02-19T21:05:51.256640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 81.2744828107666 Dec: -57.7615005591533 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17
Image Trigger?: NO
Rate S/N Ratio: 88.6284378740819 [ if not an image trigger ]
Image S/N Ratio: 17
Flight Position: [ source = BAT ]
RA: 81.2744828107666 Dec: -57.7615005591533 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 81.299731053698 Dec: -57.7586335160306 [deg; J2000]
{ 05h 25m 11.9s , -57d 45' 31.1" }
+/- 1.01657031042247 [arcmin] (estimated 90% radius based on SNR)
+/- 0.518633277740966 [arcmin] (formal 1-sigma fit error)
SNR: 29.7113279637017
RA = 5h 25m 11.9s (81.299731 deg.)
Dec = -57d 45' 31" (-57.758634 deg.)
Angular difference between Flight and Ground position is 0.826250 arcmin
Partial Coding Fraction: 0.07226562 [ including projection effects ]
Duration
T90: 28.8959999978542 +/- 7.29501748165418
Measured from: -14.4880000054836
to: 14.4079999923706 [s; relative to TRIGTIME]
T50: 6.91200000047684 +/- 0.301887392005334
Measured from: 0.631999999284744
to: 7.54399999976158 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.84399999678135
to: 3.84399999678135 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.5920000076294
to: 38.5680000036955 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.781617 7.608045 7.403855 2.152444
0.191037 0.205668 0.181200 0.134382 [error]
Peak 0.579923 0.961698 0.886288 0.205279
0.037114 0.046476 0.043633 0.025180 [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 2.23e-06 4.02e-06 5.59e-06 1.62e-05 1.61e-05 2.79e-05 erg/cm2
Error 1.39e-07 1.50e-07 1.82e-07 1.18e-06 4.78e-07 1.26e-06 erg/cm2
Peak flux Power-law 8.90e+00 8.45e+00 5.58e+00 5.72e+00 2.53e+01 2.86e+01 ph/cm2/s
Error 8.43e-01 5.09e-01 3.37e-01 6.81e-01 1.46e+00 1.52e+00 ph/cm2/s
Fluence Cutoff-PL 1.88e-06 4.12e-06 6.00e-06 9.11e-06 1.58e-05 2.11e-05 erg/cm2
Error 1.84e-07 1.63e-07 2.45e-07 2.01e-06 4.97e-07 2.02e-06 erg/cm2
Peak flux Cutoff-PL 7.47e+00 8.90e+00 6.19e+00 3.35e+00 2.46e+01 2.59e+01 ph/cm2/s
Error 1.06e+00 5.81e-01 4.61e-01 9.11e-01 1.49e+00 1.78e+00 ph/cm2/s
Fluence Band 1.86e-06 4.12e-06 5.96e-06 1.16e-05 1.57e-05 2.14e-05 erg/cm2
Error 1.93e-07 1.66e-07 2.47e-07 3.02e-06 4.99e-07 0.00e+00 erg/cm2
Peak flux Band 7.47e+00 8.89e+00 6.19e+00 3.35e+00 2.46e+01 2.59e+01 ph/cm2/s
Error 1.06e+00 5.81e-01 4.61e-01 9.11e-01 1.49e+00 1.78e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.526 0.052 - - 2.29e-02 6.92e-04 88.183 57
CPL 0.942 0.246 108.5 25.1 4.06e-02 9.70e-03 69.758 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.599 0.084 - - 1.97e-01 1.04e-02 63.911 57
CPL 0.868 0.386 88.0 23.4 4.26e-01 1.76e-01 51.725 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: 21.184000 sec.
T50 in the 50-300 keV band: 5.568000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 74.160 -35.592 38.568
T90 28.896 -14.488 14.408
T50 6.912 0.632 7.544
Peak 1.000 2.844 3.844
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
81.2997 -57.7586 0.0064 54.1 -32.6 23.9909 29.7 TRIG_00106442
------------------------------------------
Foreground time interval of the image:
-35.592 38.568 (delta_t = 74.160 [sec])
Background time interval of the image:
-299.656 -35.592 (delta_t = 264.064 [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 -35.592 sec. to 38.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52593 ( -5.254960E-02 5.237031E-02) )
Norm@50keV : 2.292277E-02 ( -6.920937E-04 6.914716E-04) )
------------------------------------------------------------
Chi-Squared = 88.18316 using 59 PHA bins.
Reduced chi-squared = 1.547073 for 57 degrees of freedom
Null hypothesis probability = 5.054E-03
Photon flux (15-150 keV) in 74.16 sec: 2.88208 ( -0.10317 0.10372 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60627e-05 ( -4.79815e-07 4.76181e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.592 sec. to 38.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.942217 ( -0.252282 0.240429 )
Epeak [keV] : 108.519 ( -15.8610 34.2448 )
Norm@50keV : 4.064211E-02 ( -8.366432E-03 1.103393E-02) )
------------------------------------------------------------
Chi-Squared = 69.75783 using 59 PHA bins.
Reduced chi-squared = 1.245675 for 56 degrees of freedom
Null hypothesis probability = 0.102
Photon flux (15-150 keV) in 74.16 sec: 2.76519 ( -0.11076 0.1119 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57941e-05 ( -4.91236e-07 5.01841e-07 ) ergs/cm2
Band function
Time interval is from -35.592 sec. to 38.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.850835 ( -0.280857 0.340672 )
beta : -1.98246 ( -8.01754 0.236914 )
Epeak [keV] : 98.0069 ( -20.0080 34.1998 )
Norm@50keV : 4.522198E-02 ( -1.130738E-02 2.079259E-02) )
------------------------------------------------------------
Chi-Squared = 68.70970 using 59 PHA bins.
Reduced chi-squared = 1.249267 for 55 degrees of freedom
Null hypothesis probability = 0.101
Photon flux (15-150 keV) in 74.16 sec: 2.75110 ( -0.11716 0.1102 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57085e-05 ( -5.0503e-07 4.93238e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.840 sec. to 3.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59928 ( -8.407307E-02 8.455610E-02) )
Norm@50keV : 0.196599 ( -1.038681E-02 1.038641E-02) )
------------------------------------------------------------
Chi-Squared = 63.91142 using 59 PHA bins.
Reduced chi-squared = 1.121253 for 57 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 1.008 sec: 25.2583 ( -1.4612 1.4651 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85349e-06 ( -1.00483e-07 1.00547e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.840 sec. to 3.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.868153 ( -0.401549 0.369500 )
Epeak [keV] : 88.0333 ( -13.6576 33.1061 )
Norm@50keV : 0.426287 ( -0.135279 0.217184 )
------------------------------------------------------------
Chi-Squared = 51.72532 using 59 PHA bins.
Reduced chi-squared = 0.9236664 for 56 degrees of freedom
Null hypothesis probability = 0.637
Photon flux (15-150 keV) in 1.008 sec: 24.5778 ( -1.4904 1.4968 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84159e-06 ( -1.02899e-07 1.02423e-07 ) ergs/cm2
Band function
Time interval is from 2.840 sec. to 3.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.868677 ( -0.369484 0.402161 )
beta : -9.22360 ( -0.776396 7.36022 )
Epeak [keV] : 88.0483 ( -13.6778 33.1521 )
Norm@50keV : 0.426006 ( -0.135026 0.217561 )
------------------------------------------------------------
Chi-Squared = 51.72544 using 59 PHA bins.
Reduced chi-squared = 0.9404626 for 55 degrees of freedom
Null hypothesis probability = 0.601
Photon flux (15-150 keV) in 1.008 sec: 24.5790 ( -1.4919 1.4957 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8402e-06 ( -1.02833e-07 1.02368e-07 ) ergs/cm2
Plot creation:
Fri Jan 4 21:17:38 EST 2008