batgrbproduct Analysis for Trigger=112453
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 22:29:08 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger112453/SDC
======================================================================
Trigger: 00112453 Segment: 000
BAT Trigger Time: 133523635.584 [s; MET]
Trigger Stop: 133523636.096 [s; MET]
UTC: 2005-03-26T09:53:56.135600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 6.85721390690823 Dec: -71.375078177145 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21
Image Trigger?: NO
Rate S/N Ratio: 116.1034021896 [ if not an image trigger ]
Image S/N Ratio: 21
Flight Position: [ source = BAT ]
RA: 6.85721390690823 Dec: -71.375078177145 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 6.88121555316491 Dec: -71.3734485196805 [deg; J2000]
{ 00h 27m 31.5s , -71d 22' 24.4" }
+/- 0.539732351200606 [arcmin] (estimated 90% radius based on SNR)
+/- 0.156386001748175 [arcmin] (formal 1-sigma fit error)
SNR: 73.4041466214585
RA = 0h 27m 31.5s (6.881216 deg.)
Dec = -71d 22' 24" (-71.373449 deg.)
Angular difference between Flight and Ground position is 0.470225 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 29.3160000145435 +/- 1.18240432133217
Measured from: -5.1000000089407
to: 24.2160000056028 [s; relative to TRIGTIME]
T50: 19.3720000088215 +/- 0.128062478977274
Measured from: 0.687999993562698
to: 20.0600000023842 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0800000131130219
to: 0.919999986886978 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.84000000357628
to: 31.1799999922514 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.882417 4.621047 4.187764 1.188891
0.046885 0.052930 0.051065 0.043590 [error]
Peak 0.271492 0.521873 0.580112 0.197156
0.010976 0.014023 0.014955 0.011220 [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 8.91e-07 1.92e-06 3.23e-06 1.24e-05 8.87e-06 1.80e-05 erg/cm2
Error 3.81e-08 4.65e-08 6.01e-08 5.88e-07 1.55e-07 0.00e+00 erg/cm2
Peak flux Power-law 2.62e+00 3.64e+00 3.74e+00 7.03e+00 1.22e+01 1.70e+01 ph/cm2/s
Error 1.84e-01 1.89e-01 1.20e-01 5.18e-01 3.90e-01 5.66e-01 ph/cm2/s
Fluence Cutoff-PL 8.56e-07 1.92e-06 3.27e-06 1.08e-05 8.82e-06 1.19e-05 erg/cm2
Error 5.31e-08 4.70e-08 8.05e-08 1.75e-06 1.64e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.56e+00 3.65e+00 3.77e+00 6.63e+00 1.22e+01 1.65e+01 ph/cm2/s
Error 2.37e-01 1.53e-01 1.33e-01 1.08e+00 3.98e-01 1.14e+00 ph/cm2/s
Fluence Band 8.48e-07 1.91e-06 3.27e-06 1.08e-05 8.82e-06 1.10e-05 erg/cm2
Error 5.49e-08 4.69e-08 7.73e-08 1.37e-06 1.65e-07 0.00e+00 erg/cm2
Peak flux Band 2.57e+00 3.65e+00 3.77e+00 6.62e+00 1.22e+01 1.66e+01 ph/cm2/s
Error 2.07e-01 1.53e-01 1.53e-01 1.08e+00 4.06e-01 1.14e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.249 0.035 - - 2.16e-02 3.92e-04 42.475 57
CPL 1.123 0.147 431.4 4883.8 2.42e-02 2.77e-03 40.373 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.961 0.058 - - 1.07e-01 3.33e-03 55.839 57
CPL 0.891 0.173 978.6 5000.0 1.14e-01 1.91e-02 55.633 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: 29.312000 sec.
T50 in the 50-300 keV band: 19.456000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 41.020 -9.840 31.180
T90 29.316 -5.100 24.216
T50 19.372 0.688 20.060
Peak 1.000 -0.080 0.920
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
6.8812 -71.3734 0.0026 26.6 78.3 7.5186 73.4 TRIG_00112453
------------------------------------------
Foreground time interval of the image:
-9.840 10.021 (delta_t = 19.861 [sec])
Background time interval of the image:
-222.579 -9.840 (delta_t = 212.739 [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 -9.840 sec. to 31.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24887 ( -3.541756E-02 3.529990E-02) )
Norm@50keV : 2.159661E-02 ( -3.923886E-04 3.911685E-04) )
------------------------------------------------------------
Chi-Squared = 42.47451 using 59 PHA bins.
Reduced chi-squared = 0.7451668 for 57 degrees of freedom
Null hypothesis probability = 0.924
Photon flux (15-150 keV) in 41.02 sec: 2.55382 ( -0.05282 0.05306 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.86877e-06 ( -1.54892e-07 1.54686e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.840 sec. to 31.180 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12272 ( -0.154057 0.140245 )
Epeak [keV] : 431.437 ( -199.038 9568.56 )
Norm@50keV : 2.423726E-02 ( -1.946440E-03 3.590237E-03) )
------------------------------------------------------------
Chi-Squared = 40.37321 using 59 PHA bins.
but latest trial 2.229299E-02 gives Chi-Squared = 1.22487
Reduced chi-squared = 0.7209502 for 56 degrees of freedom
Null hypothesis probability = 0.943
Photon flux (15-150 keV) in 41.02 sec: 2.52581 ( -0.06029 0.05928 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.82229e-06 ( -1.62562e-07 1.66049e-07 ) ergs/cm2
Band function
Time interval is from -9.840 sec. to 31.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.828244 ( -9.17176 2.02772 )
beta : -1.25752 ( -8.14019 0.627363 )
Epeak [keV] : 89.4146 ( -433.507 9566.39 )
Norm@50keV : 3.992218E-02 ( -1.970774E-03 9.65635 )
------------------------------------------------------------
Chi-Squared = 42.19421 using 59 PHA bins.
Reduced chi-squared = 0.7671674 for 55 degrees of freedom
Null hypothesis probability = 0.897
Photon flux (15-150 keV) in 41.02 sec: 2.52564 ( -0.06105 0.0613 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81672e-06 ( -1.65434e-07 1.65188e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.080 sec. to 0.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.960689 ( -5.780929E-02 5.737740E-02) )
Norm@50keV : 0.106540 ( -3.335260E-03 3.320329E-03) )
------------------------------------------------------------
Chi-Squared = 55.83870 using 59 PHA bins.
Reduced chi-squared = 0.9796264 for 57 degrees of freedom
Null hypothesis probability = 0.519
Photon flux (15-150 keV) in 1.000 sec: 12.2446 ( -0.3896 0.3903 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16855e-06 ( -3.7795e-08 3.7827e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.080 sec. to 0.920 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.891223 ( -0.226197 0.119049 )
Epeak [keV] : 978.611 ( -978.601 9021.39 )
Norm@50keV : 0.113911 ( -1.167327E-02 2.660045E-02) )
------------------------------------------------------------
Chi-Squared = 55.63343 using 59 PHA bins.
but latest trial 0.106583 gives Chi-Squared = 0.256596
Reduced chi-squared = 0.9934540 for 56 degrees of freedom
Null hypothesis probability = 0.489
Photon flux (15-150 keV) in 1.000 sec: 12.2117 ( -0.389 0.4067 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16727e-06 ( -3.8224e-08 3.8498e-08 ) ergs/cm2
Band function
Time interval is from -0.080 sec. to 0.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.810386 ( -10.1639 4.83400 )
beta : -0.960688 ( -8.96768 0.126991 )
Epeak [keV] : 47.0294 ( -996.630 9003.27 )
Norm@50keV : 0.170539 ( -5.000003E-03 2348.96 )
------------------------------------------------------------
Chi-Squared = 55.83868 using 59 PHA bins.
Reduced chi-squared = 1.015249 for 55 degrees of freedom
Null hypothesis probability = 0.443
Photon flux (15-150 keV) in 1.000 sec: 12.2120 ( -0.4058 0.4063 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16652e-06 ( -3.8596e-08 3.8469e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 22:59:29 EST 2008