batgrbproduct Analysis for Trigger=156561
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 13:24:57 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger156561/GCN5_download_cron
======================================================================
Trigger: 00156561 Segment: 000
BAT Trigger Time: 149134368 [s; MET]
Trigger Stop: 149134496 [s; MET]
UTC: 2005-09-23T02:12:48.256240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 287.704275574726 Dec: 7.59948528076329 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33325
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33325
Flight Position: [ source = BAT ]
RA: 287.704275574726 Dec: 7.59948528076329 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 287.710616424077 Dec: 7.62723736102074 [deg; J2000]
{ 19h 10m 50.5s , +07d 37' 38.1" }
+/- 4.39422263738054 [arcmin] (estimated 90% radius based on SNR)
+/- 2.7534791222765 [arcmin] (formal 1-sigma fit error)
SNR: 3.67041728389138
RA = 19h 10m 50.5s (287.710616 deg.)
Dec = 7d 37' 38" (7.627237 deg.)
Angular difference between Flight and Ground position is 1.707291 arcmin
Partial Coding Fraction: 0.453125 [ including projection effects ]
Duration
T90: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
T50: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 128 second)
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.149950 0.088842 0.025039 0.005728
0.038917 0.039111 0.033938 0.029664 [error]
Peak 0.149950 0.088842 0.025039 0.005728
0.038917 0.039111 0.033938 0.029664 [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 4.25e-08 4.31e-08 3.09e-08 3.54e-08 1.30e-07 1.53e-07 erg/cm2
Error 1.94e-08 2.05e-08 2.75e-08 7.06e-08 6.76e-08 1.10e-07 erg/cm2
Peak flux Power-law 4.41e-02 2.50e-02 8.96e-03 4.22e-03 8.04e-02 8.23e-02 ph/cm2/s
Error 2.06e-02 1.15e-02 8.92e-03 7.70e-03 3.17e-02 3.31e-02 ph/cm2/s
Fluence Cutoff-PL 4.36e-08 4.83e-08 1.25e-08 4.24e-10 1.05e-07 1.03e-07 erg/cm2
Error 1.64e-08 3.81e-08 3.04e-08 6.46e-08 7.07e-08 1.10e-07 erg/cm2
Peak flux Cutoff-PL 4.46e-02 2.85e-02 4.07e-03 7.59e-05 7.72e-02 7.72e-02 ph/cm2/s
Error 1.71e-02 2.22e-02 8.60e-03 7.09e-03 3.12e-02 3.19e-02 ph/cm2/s
Fluence Band 4.47e-08 4.34e-08 2.35e-08 1.82e-08 1.22e-07 1.49e-07 erg/cm2
Error 2.09e-08 2.30e-08 2.28e-08 1.66e-08 5.78e-08 0.00e+00 erg/cm2
Peak flux Band 3.38e-01 1.86e-01 6.47e-02 2.93e-02 6.04e-01 8.34e-02 ph/cm2/s
Error 3.93e+00 2.18e+00 8.20e-01 3.86e-01 5.04e+03 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.479 0.927 - - 4.13e-04 3.48e-04 69.163 57
CPL 1.290 2.829 17.5 5000.0 2.92e-03 0.00e+00 68.882 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.479 0.927 - - 4.13e-04 3.48e-04 69.163 57
CPL 1.290 2.643 17.5 5000.0 2.92e-03 0.00e+00 68.882 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 128.000 0.000 128.000
T90 128.000 0.000 128.000
T50 128.000 0.000 128.000
Peak 128.000 0.000 128.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
287.7106 +7.6272 0.0524 33.8 -52.5 0.2646 3.7 TRIG_00156561
------------------------------------------
Foreground time interval of the image:
0.000 12.608 (delta_t = 12.608 [sec])
14.000 33.044 (delta_t = 19.044 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.608100
14.000000 33.044400
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47880 ( -0.781144 1.07210 )
Norm@50keV : 4.130097E-04 ( -4.130097E-04 2.828001E-04) )
------------------------------------------------------------
Chi-Squared = 69.16266 using 59 PHA bins.
Reduced chi-squared = 1.213380 for 57 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 31.65 sec: 8.036068E-02 ( -0.0316912 0.0317683 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30334e-07 ( -6.24869e-08 7.26959e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.608100
14.000000 33.044400
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29007 ( -4.29007 1.36772 )
Epeak [keV] : 17.4680 ( -17.4580 9982.53 )
Norm@50keV : 2.924768E-03 ( )
------------------------------------------------------------
Chi-Squared = 68.88249 using 59 PHA bins.
Reduced chi-squared = 1.230044 for 56 degrees of freedom
Null hypothesis probability = 0.116
Photon flux (15-150 keV) in 31.65 sec: 7.724054E-02 ( -0.0304616 0.0319725 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04924e-07 ( -4.84565e-08 9.29674e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.608100
14.000000 33.044400
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26490 ( -14.8927 0.107309 )
beta : -3.03271 ( -6.96730 1.19594 )
Epeak [keV] : 19.1798 ( -19.0798 103.883 )
Norm@50keV : 2.812952E-03 ( -408.980 2.062568E+06) )
------------------------------------------------------------
Chi-Squared = 68.81941 using 59 PHA bins.
Reduced chi-squared = 1.251262 for 55 degrees of freedom
Null hypothesis probability = 9.967E-02
Photon flux (15-150 keV) in 31.65 sec: 0.604380 ( -0.60438 10081.6 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22325e-07 ( -4.78064e-08 6.77731e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 14.000 sec. to 33.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47880 ( -0.781144 1.07210 )
Norm@50keV : 4.130097E-04 ( -4.130097E-04 2.828001E-04) )
------------------------------------------------------------
Chi-Squared = 69.16266 using 59 PHA bins.
Reduced chi-squared = 1.213380 for 57 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 31.65 sec: 8.036068E-02 ( -0.0316912 0.0317683 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30334e-07 ( -6.24869e-08 7.26959e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 14.000 sec. to 33.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29007 ( -4.29007 0.994962 )
Epeak [keV] : 17.4680 ( -17.4580 9982.53 )
Norm@50keV : 2.924768E-03 ( )
------------------------------------------------------------
Chi-Squared = 68.88249 using 59 PHA bins.
Reduced chi-squared = 1.230044 for 56 degrees of freedom
Null hypothesis probability = 0.116
Photon flux (15-150 keV) in 31.65 sec: 7.724054E-02 ( -0.0304616 0.0319725 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04924e-07 ( -4.84565e-08 9.29674e-08 ) ergs/cm2
Band function
Time interval is from 14.000 sec. to 33.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26490 ( -14.8927 0.107309 )
beta : -3.03271 ( -6.96730 1.19594 )
Epeak [keV] : 19.1798 ( -19.0798 103.883 )
Norm@50keV : 2.812952E-03 ( -408.980 2.062568E+06) )
------------------------------------------------------------
Chi-Squared = 68.81941 using 59 PHA bins.
Reduced chi-squared = 1.251262 for 55 degrees of freedom
Null hypothesis probability = 9.967E-02
Photon flux (15-150 keV) in 31.65 sec: 0.604380 ( -0.60438 10081.6 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22325e-07 ( -4.78064e-08 6.77731e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 13:29:53 EST 2008