batgrbproduct Analysis for Trigger=163765
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 9 18:41:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger163765/SDC
======================================================================
Trigger: 00163765 Segment: 000
BAT Trigger Time: 153588154.56 [s; MET]
Trigger Stop: 153588155.584 [s; MET]
UTC: 2005-11-13T15:22:34.722320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 187.222134587575 Dec: -26.3906051826446 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.43
Image Trigger?: NO
Rate S/N Ratio: 13.7113092008021 [ if not an image trigger ]
Image S/N Ratio: 7.43
Flight Position: [ source = BAT ]
RA: 187.222134587575 Dec: -26.3906051826446 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 187.244233628531 Dec: -26.391521469197 [deg; J2000]
{ 12h 28m 58.6s , -26d 23' 29.5" }
+/- 1.45359219886898 [arcmin] (estimated 90% radius based on SNR)
+/- 0.521774077626124 [arcmin] (formal 1-sigma fit error)
SNR: 17.8261495790141
RA = 12h 28m 58.6s (187.244234 deg.)
Dec = -26d 23' 29" (-26.391521 deg.)
Angular difference between Flight and Ground position is 1.189026 arcmin
Partial Coding Fraction: 0.2460938 [ including projection effects ]
Duration
T90: 93.2800000011921 +/- 13.5862155267008
Measured from: -28.1719999909401
to: 65.108000010252 [s; relative to TRIGTIME]
T50: 38.3160000145435 +/- 24.4099642128034
Measured from: -20.1040000021458
to: 18.2120000123978 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.26800000667572
to: 1.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.7479999959469
to: 67.3319999873638 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.226586 1.422115 1.122004 0.219446
0.099483 0.102097 0.089504 0.076038 [error]
Peak 0.062265 0.091675 0.078682 0.021398
0.011055 0.012073 0.011329 0.008532 [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 4.33e-07 6.99e-07 8.51e-07 2.03e-06 2.56e-06 4.03e-06 erg/cm2
Error 5.69e-08 5.56e-08 8.98e-08 4.57e-07 2.13e-07 5.28e-07 erg/cm2
Peak flux Power-law 7.69e-01 7.49e-01 5.10e-01 5.44e-01 2.25e+00 2.57e+00 ph/cm2/s
Error 1.83e-01 1.12e-01 8.97e-02 1.93e-01 3.22e-01 3.59e-01 ph/cm2/s
Fluence Cutoff-PL 4.22e-07 7.13e-07 8.64e-07 1.54e-06 2.54e-06 3.34e-06 erg/cm2
Error 8.23e-08 6.62e-08 9.72e-08 8.45e-07 2.21e-07 8.96e-07 erg/cm2
Peak flux Cutoff-PL 7.30e-01 7.71e-01 5.28e-01 4.07e-01 2.23e+00 2.44e+00 ph/cm2/s
Error 2.15e-01 1.31e-01 1.05e-01 2.19e-01 3.27e-01 4.51e-01 ph/cm2/s
Fluence Band 4.15e-07 7.10e-07 8.62e-07 1.54e-06 2.54e-06 3.49e-06 erg/cm2
Error 6.63e-08 6.60e-08 9.74e-08 8.44e-07 2.25e-07 8.00e-07 erg/cm2
Peak flux Band 7.30e-01 7.71e-01 5.28e-01 4.07e-01 2.23e+00 2.44e+00 ph/cm2/s
Error 2.16e-01 1.31e-01 1.06e-01 2.88e-01 3.27e-01 4.51e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.717 0.139 - - 2.83e-03 2.25e-04 51.025 57
CPL 1.531 0.409 128.4 5000.0 3.50e-03 1.94e-03 50.602 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.555 0.238 - - 1.77e-02 2.52e-03 52.397 57
CPL 1.273 0.763 134.7 5000.0 2.45e-02 3.03e-02 52.095 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: 101.632000 sec.
T50 in the 50-300 keV band: 54.464000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 98.080 -30.748 67.332
T90 93.280 -28.172 65.108
T50 38.316 -20.104 18.212
Peak 1.000 0.268 1.268
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
187.2442 -26.3915 0.0108 42.2 -48.7 4.3320 17.8 TRIG_00163765
------------------------------------------
Foreground time interval of the image:
-30.748 67.332 (delta_t = 98.080 [sec])
Background time interval of the image:
-299.560 -30.748 (delta_t = 268.812 [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 -30.748 sec. to 67.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71677 ( -0.137614 0.139659 )
Norm@50keV : 2.826928E-03 ( -2.264297E-04 2.245395E-04) )
------------------------------------------------------------
Chi-Squared = 51.02472 using 59 PHA bins.
Reduced chi-squared = 0.8951705 for 57 degrees of freedom
Null hypothesis probability = 0.698
Photon flux (15-150 keV) in 98.08 sec: 0.377674 ( -0.030311 0.030421 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56411e-06 ( -2.13098e-07 2.13736e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.748 sec. to 67.332 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53083 ( -0.550655 0.266646 )
Epeak [keV] : 128.436 ( -128.426 9871.56 )
Norm@50keV : 3.504531E-03 ( -8.818246E-04 2.990804E-03) )
------------------------------------------------------------
Chi-Squared = 50.60158 using 59 PHA bins.
but latest trial 1.98490 gives Chi-Squared = 10.1095
Reduced chi-squared = 0.9035997 for 56 degrees of freedom
Null hypothesis probability = 0.679
Photon flux (15-150 keV) in 98.08 sec: 0.374305 ( -0.031478 0.031117 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53781e-06 ( -2.26271e-07 2.16669e-07 ) ergs/cm2
Band function
Time interval is from -30.748 sec. to 67.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48783 ( -8.51217 0.509539 )
beta : -8.74690 ( -1.25310 7.15706 )
Epeak [keV] : 113.682 ( -113.582 9886.32 )
Norm@50keV : 3.675833E-03 ( -1.054533E-03 2.828553E-03) )
------------------------------------------------------------
Chi-Squared = 50.61880 using 59 PHA bins.
Reduced chi-squared = 0.9203419 for 55 degrees of freedom
Null hypothesis probability = 0.643
Photon flux (15-150 keV) in 98.08 sec: 0.374312 ( -0.031539 0.031528 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53529e-06 ( -2.26172e-07 2.24721e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55543 ( -0.235348 0.240756 )
Norm@50keV : 1.772821E-02 ( -2.533657E-03 2.514441E-03) )
------------------------------------------------------------
Chi-Squared = 52.39680 using 59 PHA bins.
Reduced chi-squared = 0.9192421 for 57 degrees of freedom
Null hypothesis probability = 0.648
Photon flux (15-150 keV) in 1.000 sec: 2.24782 ( -0.32209 0.32272 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66817e-07 ( -2.545e-08 2.5571e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27288 ( -1.01842 0.508079 )
Epeak [keV] : 134.715 ( -134.705 9865.29 )
Norm@50keV : 2.448873E-02 ( -9.114382E-03 5.142135E-02) )
------------------------------------------------------------
Chi-Squared = 52.09489 using 59 PHA bins.
Reduced chi-squared = 0.9302659 for 56 degrees of freedom
Null hypothesis probability = 0.623
Photon flux (15-150 keV) in 1.000 sec: 2.22974 ( -0.32726 0.32643 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65242e-07 ( -2.6452e-08 2.6983e-08 ) ergs/cm2
Band function
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27352 ( -8.72648 1.01919 )
beta : -9.24822 ( -0.751784 7.91448 )
Epeak [keV] : 135.209 ( -135.109 9864.79 )
Norm@50keV : 2.445331E-02 ( -9.081966E-03 5.130025E-02) )
------------------------------------------------------------
Chi-Squared = 52.09487 using 59 PHA bins.
Reduced chi-squared = 0.9471795 for 55 degrees of freedom
Null hypothesis probability = 0.586
Photon flux (15-150 keV) in 1.000 sec: 2.22976 ( -0.32729 0.32724 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65029e-07 ( -2.6389e-08 2.6191e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 18:49:58 EST 2008