batgrbproduct Analysis for Trigger=255029
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): Thu Dec 13 10:34:03 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger255029/SDC
======================================================================
Trigger: 00255029 Segment: 000
BAT Trigger Time: 189864320 [s; MET]
Trigger Stop: 189864416 [s; MET]
UTC: 2007-01-07T12:05:18.316420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 159.407793776817 Dec: -53.207754632713 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.29
Flight Position: [ source = BAT ]
RA: 159.407793776817 Dec: -53.207754632713 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 159.428393867113 Dec: -53.214720036575 [deg; J2000]
{ 10h 37m 42.8s , -53d 12' 53.0" }
+/- 1.28022410637669 [arcmin] (estimated 90% radius based on SNR)
+/- 0.51042373214489 [arcmin] (formal 1-sigma fit error)
SNR: 21.3723690503639
RA = 10h 37m 42.8s (159.428394 deg.)
Dec = -53d 12' 53" (-53.214720 deg.)
Angular difference between Flight and Ground position is 0.850035 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 347.324000000954 +/- 32.9090465269772
Measured from: -15.7599999904633
to: 331.56400001049 [s; relative to TRIGTIME]
T50: 40.0360000133514 +/- 4.78500366071558
Measured from: -5.75600001215935
to: 34.2800000011921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -7.24000000953674
to: -6.24000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.6040000021458
to: 404.152000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.004303 2.626200 2.332169 0.893740
0.121069 0.121530 0.107588 0.094864 [error]
Peak 0.041422 0.083014 0.090101 0.033357
0.008445 0.009055 0.008736 0.007412 [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 5.79e-07 1.18e-06 1.87e-06 6.58e-06 5.19e-06 1.02e-05 erg/cm2
Error 6.28e-08 7.23e-08 1.06e-07 9.10e-07 2.64e-07 9.45e-07 erg/cm2
Peak flux Power-law 4.22e-01 5.83e-01 5.95e-01 1.11e+00 1.95e+00 2.71e+00 ph/cm2/s
Error 1.08e-01 8.90e-02 6.65e-02 2.86e-01 2.27e-01 3.11e-01 ph/cm2/s
Fluence Cutoff-PL 5.78e-07 1.18e-06 1.87e-06 6.53e-06 5.19e-06 1.02e-05 erg/cm2
Error 6.28e-08 7.24e-08 1.06e-07 9.03e-07 2.64e-07 9.40e-07 erg/cm2
Peak flux Cutoff-PL 4.21e-01 5.83e-01 5.95e-01 1.10e+00 1.95e+00 2.70e+00 ph/cm2/s
Error 1.08e-01 8.91e-02 6.65e-02 2.84e-01 2.27e-01 3.10e-01 ph/cm2/s
Fluence Band 5.72e-07 1.17e-06 1.87e-06 6.61e-06 1.02e-05 0.00e+00 erg/cm2
Error 3.10e-08 5.67e-08 9.04e-08 4.96e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.21e-01 5.82e-01 5.95e-01 1.11e+00 1.95e+00 2.71e+00 ph/cm2/s
Error 5.29e-02 6.44e-02 6.47e-02 1.92e-01 2.15e-01 2.94e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.335 0.097 - - 1.25e-03 6.09e-05 59.201 57
CPL 1.331 0.098 9995.5 5000.0 1.25e-03 6.11e-05 59.281 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.970 0.207 - - 1.70e-02 1.93e-03 55.532 57
CPL 0.964 0.208 9999.2 5000.0 1.71e-02 1.93e-03 55.560 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: 194.752000 sec.
T50 in the 50-300 keV band: 19.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 424.756 -20.604 404.152
T90 347.324 -15.760 331.564
T50 40.036 -5.756 34.280
Peak 1.000 -7.240 -6.240
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
159.4284 -53.2147 0.0090 37.9 166.9 3.3114 21.4 TRIG_00255029
------------------------------------------
Foreground time interval of the image:
2.805 109.005 (delta_t = 106.200 [sec])
Background time interval of the image:
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 -20.604 sec. to 404.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33458 ( -9.729469E-02 9.650850E-02) )
Norm@50keV : 1.246320E-03 ( -6.101152E-05 6.087404E-05) )
------------------------------------------------------------
Chi-Squared = 59.20095 using 59 PHA bins.
Reduced chi-squared = 1.038613 for 57 degrees of freedom
Null hypothesis probability = 0.395
Photon flux (15-150 keV) in 424.8 sec: 0.149679 ( -0.008205 0.008246 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18902e-06 ( -2.63546e-07 2.64311e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.604 sec. to 404.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33093 ( -9.802413E-02 9.713256E-02) )
Epeak [keV] : 9995.49 ( -9995.48 4.50586 )
Norm@50keV : 1.251278E-03 ( -6.114936E-05 6.103108E-05) )
------------------------------------------------------------
Chi-Squared = 59.28091 using 59 PHA bins.
Reduced chi-squared = 1.058588 for 56 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 424.8 sec: 0.149602 ( -0.008201 0.008242 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19021e-06 ( -2.63673e-07 2.64396e-07 ) ergs/cm2
Band function
Time interval is from -20.604 sec. to 404.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05100 ( -8.94900 3.61971 )
beta : -1.33440 ( -9.620714E-02 9.713936E-02) )
Epeak [keV] : 45.7626 ( -45.6626 6746.63 )
Norm@50keV : 2.389717E-03 ( -2.389717E-03 3.15178 )
------------------------------------------------------------
Chi-Squared = 59.20145 using 59 PHA bins.
Reduced chi-squared = 1.076390 for 55 degrees of freedom
Null hypothesis probability = 0.325
Photon flux (15-150 keV) in 424.8 sec: 0.149347 ( -0.003948 0.00723 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -7.240 sec. to -6.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.970184 ( -0.211890 0.201590 )
Norm@50keV : 1.698390E-02 ( -1.944660E-03 1.912655E-03) )
------------------------------------------------------------
Chi-Squared = 55.53157 using 59 PHA bins.
Reduced chi-squared = 0.9742380 for 57 degrees of freedom
Null hypothesis probability = 0.530
Photon flux (15-150 keV) in 1.000 sec: 1.95259 ( -0.22662 0.22803 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85684e-07 ( -2.0957e-08 2.0935e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.240 sec. to -6.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.964379 ( -0.213753 0.202934 )
Epeak [keV] : 9999.21 ( -9999.20 0.788086 )
Norm@50keV : 1.708928E-02 ( -1.948143E-03 1.918981E-03) )
------------------------------------------------------------
Chi-Squared = 55.56044 using 59 PHA bins.
Reduced chi-squared = 0.9921507 for 56 degrees of freedom
Null hypothesis probability = 0.491
Photon flux (15-150 keV) in 1.000 sec: 1.95209 ( -0.22662 0.22793 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85733e-07 ( -2.0954e-08 2.0965e-08 ) ergs/cm2
Band function
Time interval is from -7.240 sec. to -6.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.801531 ( -9.19847 4.95423 )
beta : -0.970172 ( -0.201528 0.211858 )
Epeak [keV] : 51.1670 ( -51.0670 9948.83 )
Norm@50keV : 2.787479E-02 ( -1.273639E-02 7152.81 )
------------------------------------------------------------
Chi-Squared = 55.53157 using 59 PHA bins.
Reduced chi-squared = 1.009665 for 55 degrees of freedom
Null hypothesis probability = 0.455
Photon flux (15-150 keV) in 1.000 sec: 1.95183 ( -0.22085 0.20821 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8598e-07 ( -2.0327e-08 1.9837e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 10:56:54 EST 2007