batgrbproduct Analysis for Trigger=103906
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 20:17:36 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger103906/GCN_download_cron
======================================================================
Trigger: 00103906 Segment: 000
BAT Trigger Time: 128578794.56 [s; MET]
Trigger Stop: 128578795.584 [s; MET]
UTC: 2005-01-28T04:19:55.191240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 219.591125684255 Dec: -34.7619892410826 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12
Image Trigger?: NO
Rate S/N Ratio: 35.5668384875575 [ if not an image trigger ]
Image S/N Ratio: 12
Flight Position: [ source = BAT ]
RA: 219.591125684255 Dec: -34.7619892410826 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 219.588253447658 Dec: -34.7644588841953 [deg; J2000]
{ 14h 38m 21.2s , -34d 45' 52.1" }
+/- 1.10559341718931 [arcmin] (estimated 90% radius based on SNR)
+/- 0.311539580674713 [arcmin] (formal 1-sigma fit error)
SNR: 26.3535529192513
RA = 14h 38m 21.2s (219.588253 deg.)
Dec = -34d 45' 52" (-34.764459 deg.)
Angular difference between Flight and Ground position is 0.204940 arcmin
Partial Coding Fraction: 0.1035156 [ including projection effects ]
Duration
T90: 28 +/- 9.05538513813742
Measured from: -6.56000000238419
to: 21.4399999976158 [s; relative to TRIGTIME]
T50: 8 +/- 1
Measured from: -2.56000000238419
to: 5.43999999761581 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.43999999761581
to: 6.43999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.56000000238419
to: 25.4399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.429255 2.443730 2.417151 0.690022
0.091711 0.099544 0.092422 0.069946 [error]
Peak 0.164072 0.284717 0.327272 0.079725
0.020621 0.024446 0.024830 0.016474 [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 6.21e-07 1.21e-06 1.84e-06 6.12e-06 5.17e-06 9.72e-06 erg/cm2
Error 5.36e-08 6.36e-08 8.80e-08 6.45e-07 2.27e-07 0.00e+00 erg/cm2
Peak flux Power-law 2.20e+00 2.42e+00 1.90e+00 2.47e+00 7.44e+00 8.99e+00 ph/cm2/s
Error 3.64e-01 2.52e-01 1.88e-01 4.94e-01 7.01e-01 8.00e-01 ph/cm2/s
Fluence Cutoff-PL 5.20e-07 1.26e-06 2.00e-06 3.18e-06 5.10e-06 6.81e-06 erg/cm2
Error 6.86e-08 7.10e-08 1.17e-07 1.00e-06 2.34e-07 1.01e-06 erg/cm2
Peak flux Cutoff-PL 1.63e+00 2.53e+00 2.21e+00 1.27e+00 7.15e+00 7.63e+00 ph/cm2/s
Error 4.80e-01 2.87e-01 2.75e-01 5.53e-01 7.25e-01 9.36e-01 ph/cm2/s
Fluence Band 5.17e-07 1.25e-06 1.99e-06 3.17e-06 5.10e-06 6.97e-06 erg/cm2
Error 6.79e-08 7.07e-08 1.16e-07 1.00e-06 2.34e-07 9.94e-07 erg/cm2
Peak flux Band 1.63e+00 2.53e+00 2.21e+00 1.27e+00 7.15e+00 7.64e+00 ph/cm2/s
Error 4.80e-01 2.87e-01 2.75e-01 5.49e-01 7.26e-01 9.37e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.393 0.074 - - 1.62e-02 7.03e-04 55.460 57
CPL 0.752 0.339 114.7 38.8 3.09e-02 1.05e-02 43.387 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.346 0.144 - - 6.18e-02 5.47e-03 70.118 57
CPL 0.301 0.740 98.1 43.4 1.74e-01 1.37e-01 62.638 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: 12.800000 sec.
T50 in the 50-300 keV band: 7.488000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.000 -7.560 25.440
T90 28.000 -6.560 21.440
T50 8.000 -2.560 5.440
Peak 1.000 5.440 6.440
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
219.5883 -34.7645 0.0072 51.5 -36.2 6.9495 26.4 TRIG_00103906
------------------------------------------
Foreground time interval of the image:
-7.560 10.941 (delta_t = 18.501 [sec])
Background time interval of the image:
-299.560 -7.560 (delta_t = 292.000 [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 -7.560 sec. to 25.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39286 ( -7.378149E-02 7.334459E-02) )
Norm@50keV : 1.619840E-02 ( -7.036468E-04 7.030237E-04) )
------------------------------------------------------------
Chi-Squared = 55.46043 using 59 PHA bins.
Reduced chi-squared = 0.9729899 for 57 degrees of freedom
Null hypothesis probability = 0.533
Photon flux (15-150 keV) in 33.00 sec: 1.96949 ( -0.09568 0.09606 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17252e-06 ( -2.26314e-07 2.26842e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.560 sec. to 25.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.752341 ( -0.353514 0.324292 )
Epeak [keV] : 114.698 ( -21.3404 56.2712 )
Norm@50keV : 3.085237E-02 ( -8.410998E-03 1.265163E-02) )
------------------------------------------------------------
Chi-Squared = 43.38699 using 59 PHA bins.
Reduced chi-squared = 0.7747677 for 56 degrees of freedom
Null hypothesis probability = 0.891
Photon flux (15-150 keV) in 33.00 sec: 1.90678 ( -0.09964 0.1002 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09893e-06 ( -2.3463e-07 2.33574e-07 ) ergs/cm2
Band function
Time interval is from -7.560 sec. to 25.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.751421 ( -0.325137 0.352656 )
beta : -8.21703 ( -1.78297 6.62365 )
Epeak [keV] : 114.585 ( -21.2659 56.4273 )
Norm@50keV : 3.088196E-02 ( -8.442387E-03 1.263680E-02) )
------------------------------------------------------------
Chi-Squared = 43.38700 using 59 PHA bins.
Reduced chi-squared = 0.7888545 for 55 degrees of freedom
Null hypothesis probability = 0.871
Photon flux (15-150 keV) in 33.00 sec: 1.90685 ( -0.09974 0.1002 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09553e-06 ( -2.34333e-07 2.33409e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 5.440 sec. to 6.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34625 ( -0.143543 0.144155 )
Norm@50keV : 6.181469E-02 ( -5.468581E-03 5.467892E-03) )
------------------------------------------------------------
Chi-Squared = 70.11817 using 59 PHA bins.
Reduced chi-squared = 1.230143 for 57 degrees of freedom
Null hypothesis probability = 0.114
Photon flux (15-150 keV) in 1.000 sec: 7.44117 ( -0.6996 0.70189 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04241e-07 ( -5.6135e-08 5.6298e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.440 sec. to 6.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.300635 ( -0.803569 0.677244 )
Epeak [keV] : 98.0546 ( -19.1798 67.7177 )
Norm@50keV : 0.173536 ( -8.294019E-02 0.191478 )
------------------------------------------------------------
Chi-Squared = 62.63765 using 59 PHA bins.
Reduced chi-squared = 1.118530 for 56 degrees of freedom
Null hypothesis probability = 0.253
Photon flux (15-150 keV) in 1.000 sec: 7.15053 ( -0.7238 0.72668 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.00716e-07 ( -5.798e-08 5.7624e-08 ) ergs/cm2
Band function
Time interval is from 5.440 sec. to 6.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.305720 ( -0.672280 0.413851 )
beta : -9.02902 ( -0.970983 7.30317 )
Epeak [keV] : 98.2645 ( -19.4272 67.5654 )
Norm@50keV : 0.172619 ( -8.202606E-02 0.192530 )
------------------------------------------------------------
Chi-Squared = 62.63832 using 59 PHA bins.
Reduced chi-squared = 1.138879 for 55 degrees of freedom
Null hypothesis probability = 0.224
Photon flux (15-150 keV) in 1.000 sec: 7.15150 ( -0.7258 0.72696 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.00388e-07 ( -5.7902e-08 5.7583e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 20:30:07 EST 2008