batgrbproduct Analysis for Trigger=155572
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 12:13:52 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155572/GCN5_download_cron
======================================================================
Trigger: 00155572 Segment: 000
BAT Trigger Time: 148672984 [s; MET]
Trigger Stop: 148673048 [s; MET]
UTC: 2005-09-17T18:03:04.265740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 79.1091664062453 Dec: -62.5822836108812 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33310
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33310
Flight Position: [ source = BAT ]
RA: 79.1091664062453 Dec: -62.5822836108812 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 79.1096295998996 Dec: -62.5376366401799 [deg; J2000]
{ 05h 16m 26.3s , -62d 32' 15.5" }
+/- 4.82835068021219 [arcmin] (estimated 90% radius based on SNR)
+/- 3.10955596538546 [arcmin] (formal 1-sigma fit error)
SNR: 3.2082111518084
RA = 5h 16m 26.3s (79.109630 deg.)
Dec = -62d 32' 15" (-62.537637 deg.)
Angular difference between Flight and Ground position is 2.678849 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.128204 0.066177 -0.015254 0.026533
0.032302 0.032541 0.028738 0.025272 [error]
Peak 0.128204 0.066177 -0.015254 0.026533
0.032302 0.032541 0.028738 0.025272 [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 3.34e-08 2.74e-08 1.53e-08 1.26e-08 8.16e-08 8.72e-08 erg/cm2
Error 1.54e-08 1.60e-08 1.84e-08 3.14e-08 4.69e-08 6.39e-08 erg/cm2
Peak flux Power-law 3.52e-02 1.63e-02 4.54e-03 1.58e-03 5.69e-02 5.77e-02 ph/cm2/s
Error 1.65e-02 9.15e-03 5.31e-03 3.57e-03 2.53e-02 2.62e-02 ph/cm2/s
Fluence Cutoff-PL 3.82e-08 3.14e-08 1.57e-09 5.72e-13 7.12e-08 7.14e-08 erg/cm2
Error 1.71e-08 2.12e-08 9.39e-09 3.65e-09 3.16e-08 3.16e-08 erg/cm2
Peak flux Cutoff-PL 3.92e-02 1.96e-02 5.50e-04 1.05e-07 5.94e-02 5.94e-02 ph/cm2/s
Error 1.78e-02 1.22e-02 2.87e-03 5.25e-04 2.36e-02 2.36e-02 ph/cm2/s
Fluence Band 3.23e-08 2.84e-08 1.71e-08 1.71e-08 9.23e-08 1.07e-07 erg/cm2
Error 1.44e-08 1.27e-08 1.83e-08 1.18e-08 4.37e-08 0.00e+00 erg/cm2
Peak flux Band 3.60e-02 1.93e-02 2.66e-03 1.23e-04 5.89e-02 5.85e-02 ph/cm2/s
Error 1.53e-02 9.42e-03 4.41e-03 2.57e-03 2.46e-02 2.51e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.786 1.039 - - 2.42e-04 2.24e-04 50.192 57
CPL -2.447 0.000 22.2 7.1 2.00e+00 1.43e+01 47.227 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.786 1.039 - - 2.42e-04 2.24e-04 50.192 57
CPL -2.447 0.000 22.2 7.1 2.00e+00 1.43e+01 47.227 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
79.1096 -62.5376 0.0600 34.5 -5.1 0.2171 3.2 TRIG_00155572
------------------------------------------
Foreground time interval of the image:
0.000 9.188 (delta_t = 9.188 [sec])
10.000 31.163 (delta_t = 21.163 [sec])
32.000 33.040 (delta_t = 1.040 [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 9.187600
10.000000 31.162800
32.000000 33.040000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.78567 ( -0.802687 1.27440 )
Norm@50keV : 2.421526E-04 ( -2.421526E-04 2.059536E-04) )
------------------------------------------------------------
Chi-Squared = 50.19151 using 59 PHA bins.
Reduced chi-squared = 0.8805527 for 57 degrees of freedom
Null hypothesis probability = 0.726
Photon flux (15-150 keV) in 31.39 sec: 5.693753E-02 ( -0.0249046 0.0257005 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.16168e-08 ( -4.20752e-08 5.17558e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 9.187600
10.000000 31.162800
32.000000 33.040000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.44738 ( )
Epeak [keV] : 22.2437 ( -6.01526 8.13536 )
Norm@50keV : 2.00468 ( -5.27243 23.4129 )
------------------------------------------------------------
Chi-Squared = 47.22684 using 59 PHA bins.
Reduced chi-squared = 0.8433365 for 56 degrees of freedom
Null hypothesis probability = 0.792
Photon flux (15-150 keV) in 31.39 sec: 5.940790E-02 ( -0.0236452 0.0236361 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11567e-08 ( -3.01237e-08 3.30424e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 9.187600
10.000000 31.162800
32.000000 33.040000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33008 ( -14.8635 0.136522 )
beta : -3.66556 ( -6.33444 13.4713 )
Epeak [keV] : 17.9649 ( -9.56611 103.374 )
Norm@50keV : 1.956596E-03 ( -143.057 1317.15 )
------------------------------------------------------------
Chi-Squared = 49.52255 using 59 PHA bins.
Reduced chi-squared = 0.9004101 for 55 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 31.39 sec: 5.889684E-02 ( -0.0245566 0.0245877 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.23491e-08 ( -4.39228e-08 4.34372e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 32.000 sec. to 33.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.78567 ( -0.802687 1.27440 )
Norm@50keV : 2.421526E-04 ( -2.421526E-04 2.059536E-04) )
------------------------------------------------------------
Chi-Squared = 50.19151 using 59 PHA bins.
Reduced chi-squared = 0.8805527 for 57 degrees of freedom
Null hypothesis probability = 0.726
Photon flux (15-150 keV) in 31.39 sec: 5.693753E-02 ( -0.0249046 0.0257005 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.16168e-08 ( -4.20752e-08 5.17558e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.000 sec. to 33.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.44738 ( )
Epeak [keV] : 22.2437 ( -6.01526 8.13536 )
Norm@50keV : 2.00468 ( -5.27243 23.4129 )
------------------------------------------------------------
Chi-Squared = 47.22684 using 59 PHA bins.
Reduced chi-squared = 0.8433365 for 56 degrees of freedom
Null hypothesis probability = 0.792
Photon flux (15-150 keV) in 31.39 sec: 5.940790E-02 ( -0.0236452 0.0236361 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11567e-08 ( -3.01237e-08 3.30424e-08 ) ergs/cm2
Band function
Time interval is from 32.000 sec. to 33.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33008 ( -14.8635 0.136522 )
beta : -3.66556 ( -6.33444 1.38617 )
Epeak [keV] : 17.9649 ( -9.56893 103.374 )
Norm@50keV : 1.956596E-03 ( -143.057 1317.15 )
------------------------------------------------------------
Chi-Squared = 49.52255 using 59 PHA bins.
Reduced chi-squared = 0.9004101 for 55 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 31.39 sec: 5.889684E-02 ( -0.0245566 0.0245877 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.23491e-08 ( -4.39228e-08 4.34372e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 12:19:21 EST 2008