batgrbproduct Analysis for Trigger=102861
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 19:37:45 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger102861/GCN_download_cron
======================================================================
Trigger: 00102861 Segment: 000
BAT Trigger Time: 127659155.392 [s; MET]
Trigger Stop: 127659171.776 [s; MET]
UTC: 2005-01-17T12:52:36.037100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 358.427357392695 Dec: 65.9453839266471 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6
Image Trigger?: NO
Rate S/N Ratio: 33.9263909073747 [ if not an image trigger ]
Image S/N Ratio: 6
Flight Position: [ source = BAT ]
RA: 358.427357392695 Dec: 65.9453839266471 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 358.477643134685 Dec: 65.9334865754606 [deg; J2000]
{ 23h 53m 54.6s , +65d 56' 00.6" }
+/- 0.672075056072658 [arcmin] (estimated 90% radius based on SNR)
+/- 0.200798564621261 [arcmin] (formal 1-sigma fit error)
SNR: 53.6616982620257
RA = 23h 53m 54.6s (358.477643 deg.)
Dec = 65d 56' 1" (65.933487 deg.)
Angular difference between Flight and Ground position is 1.422218 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 166.552000015974 +/- 2.42612449066268
Measured from: 27.8839999884367
to: 194.436000004411 [s; relative to TRIGTIME]
T50: 83.3400000035763 +/- 1.931979285913
Measured from: 57.195999994874
to: 140.53599999845 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 87.2199999988079
to: 88.2199999988079 [s; relative to TRIGTIME]
Total Fluence
Measured from: 4.27599999308586
to: 215.859999999404 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.917640 5.357976 4.050816 0.748325
0.074052 0.079890 0.074397 0.071055 [error]
Peak 0.053525 0.100519 0.112545 0.026063
0.006145 0.006919 0.006883 0.006089 [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 1.24e-06 2.27e-06 3.18e-06 9.31e-06 9.10e-06 1.60e-05 erg/cm2
Error 6.02e-08 6.11e-08 8.36e-08 5.96e-07 2.04e-07 6.24e-07 erg/cm2
Peak flux Power-law 5.13e-01 7.04e-01 7.12e-01 1.31e+00 2.35e+00 3.24e+00 ph/cm2/s
Error 7.68e-02 6.31e-02 5.42e-02 2.23e-01 1.69e-01 2.54e-01 ph/cm2/s
Fluence Cutoff-PL 1.13e-06 2.29e-06 3.27e-06 6.14e-06 8.90e-06 1.28e-05 erg/cm2
Error 8.36e-08 6.41e-08 9.82e-08 1.35e-06 2.35e-07 1.37e-06 erg/cm2
Peak flux Cutoff-PL 4.72e-01 7.16e-01 7.41e-01 9.58e-01 2.32e+00 2.89e+00 ph/cm2/s
Error 9.79e-02 6.81e-02 7.02e-02 5.11e-01 1.73e-01 4.70e-01 ph/cm2/s
Fluence Band 1.12e-06 2.28e-06 3.26e-06 6.17e-06 8.89e-06 1.29e-05 erg/cm2
Error 8.26e-08 6.40e-08 9.81e-08 1.35e-06 2.35e-07 1.36e-06 erg/cm2
Peak flux Band 4.72e-01 7.16e-01 7.41e-01 9.59e-01 2.32e+00 2.89e+00 ph/cm2/s
Error 9.78e-02 6.81e-02 7.05e-02 4.40e-01 1.74e-01 4.70e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.514 0.045 - - 4.55e-03 9.88e-05 39.702 57
CPL 1.167 0.195 137.4 61.6 6.43e-03 1.24e-03 29.763 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.982 0.127 - - 2.04e-02 1.44e-03 63.747 57
CPL 0.666 0.482 245.6 5000.0 2.82e-02 1.46e-02 62.569 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: 154.944000 sec.
T50 in the 50-300 keV band: 79.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 211.584 4.276 215.860
T90 166.552 27.884 194.436
T50 83.340 57.196 140.536
Peak 1.000 87.220 88.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
358.4776 +65.9335 0.0036 25.3 153.6 8.1904 53.7 TRIG_00102861
------------------------------------------
Foreground time interval of the image:
4.276 117.709 (delta_t = 113.433 [sec])
Background time interval of the image:
-299.392 4.276 (delta_t = 303.668 [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 4.276 sec. to 215.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51362 ( -4.458940E-02 4.463756E-02) )
Norm@50keV : 4.545462E-03 ( -9.884406E-05 9.883521E-05) )
------------------------------------------------------------
Chi-Squared = 39.70173 using 59 PHA bins.
Reduced chi-squared = 0.6965215 for 57 degrees of freedom
Null hypothesis probability = 0.961
Photon flux (15-150 keV) in 211.6 sec: 0.569560 ( -0.014567 0.014645 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.1043e-06 ( -2.0394e-07 2.04131e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.276 sec. to 215.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16664 ( -0.199642 0.190253 )
Epeak [keV] : 137.420 ( -30.0663 93.2057 )
Norm@50keV : 6.432046E-03 ( -1.091775E-03 1.385446E-03) )
------------------------------------------------------------
Chi-Squared = 29.76319 using 59 PHA bins.
Reduced chi-squared = 0.5314856 for 56 degrees of freedom
Null hypothesis probability = 0.998
Photon flux (15-150 keV) in 211.6 sec: 0.551572 ( -0.017114 0.017191 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8953e-06 ( -2.33374e-07 2.36865e-07 ) ergs/cm2
Band function
Time interval is from 4.276 sec. to 215.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16653 ( -0.190372 0.199555 )
beta : -9.07421 ( -0.925792 7.41840 )
Epeak [keV] : 137.368 ( -30.0367 93.2111 )
Norm@50keV : 6.432117E-03 ( -1.092600E-03 1.384993E-03) )
------------------------------------------------------------
Chi-Squared = 29.76340 using 59 PHA bins.
Reduced chi-squared = 0.5411528 for 55 degrees of freedom
Null hypothesis probability = 0.998
Photon flux (15-150 keV) in 211.6 sec: 0.551580 ( -0.017124 0.017258 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89052e-06 ( -2.35595e-07 2.33903e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 87.220 sec. to 88.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.981702 ( -0.128175 0.125745 )
Norm@50keV : 2.042870E-02 ( -1.445334E-03 1.441525E-03) )
------------------------------------------------------------
Chi-Squared = 63.74662 using 59 PHA bins.
Reduced chi-squared = 1.118362 for 57 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 1.000 sec: 2.34991 ( -0.16885 0.16904 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22461e-07 ( -1.7148e-08 1.7008e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 87.220 sec. to 88.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.666277 ( -0.557104 0.406303 )
Epeak [keV] : 245.557 ( -245.547 9754.44 )
Norm@50keV : 2.819282E-02 ( -8.733645E-03 2.053701E-02) )
------------------------------------------------------------
Chi-Squared = 62.56905 using 59 PHA bins.
Reduced chi-squared = 1.117304 for 56 degrees of freedom
Null hypothesis probability = 0.254
Photon flux (15-150 keV) in 1.000 sec: 2.32372 ( -0.17292 0.17358 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19883e-07 ( -1.8275e-08 1.7594e-08 ) ergs/cm2
Band function
Time interval is from 87.220 sec. to 88.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.796312 ( -9.20369 5.78211 )
beta : -0.981713 ( -8.49042 0.624140 )
Epeak [keV] : 65.2224 ( -245.060 9723.67 )
Norm@50keV : 3.311160E-02 ( -8.749546E-03 345.684 )
------------------------------------------------------------
Chi-Squared = 63.74660 using 59 PHA bins.
Reduced chi-squared = 1.159029 for 55 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 1.000 sec: 2.32374 ( -0.17402 0.1738 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19512e-07 ( -1.8036e-08 1.7854e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 19:50:50 EST 2008