batgrbproduct Analysis for Trigger=145767
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): Mon Jan 7 15:29:26 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger145767/GCN5_download_cron
======================================================================
Trigger: 00145767 Segment: 000
BAT Trigger Time: 142957043.968 [s; MET]
Trigger Stop: 142957070.848 [s; MET]
UTC: 2005-07-13T14:17:24.348140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 57.4904149263481 Dec: -12.2645563356051 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33371
Image Trigger?: NO
Rate S/N Ratio: 9.16515138991168 [ if not an image trigger ]
Image S/N Ratio: 33371
Flight Position: [ source = BAT ]
RA: 57.4904149263481 Dec: -12.2645563356051 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 57.5479952421806 Dec: -12.295587481274 [deg; J2000]
{ 03h 50m 11.5s , -12d 17' 44.1" }
+/- 4.45249542556186 [arcmin] (estimated 90% radius based on SNR)
+/- 3.06607614023231 [arcmin] (formal 1-sigma fit error)
SNR: 3.60198564096223
RA = 3h 50m 11.5s (57.547995 deg.)
Dec = -12d 17' 44" (-12.295587 deg.)
Angular difference between Flight and Ground position is 3.855177 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.050116 0.055249 0.169992 0.131320
0.053566 0.047196 0.047747 0.041245 [error]
Peak 0.050116 0.055249 0.169992 0.131320
0.053566 0.047196 0.047747 0.041245 [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 1.07e-08 3.45e-08 9.20e-08 7.21e-07 2.51e-07 8.59e-07 erg/cm2
Error 1.40e-08 2.61e-08 4.17e-08 8.47e-07 1.13e-07 8.56e-07 erg/cm2
Peak flux Power-law 1.25e-02 2.18e-02 2.91e-02 7.97e-02 8.48e-02 1.43e-01 ph/cm2/s
Error 1.67e-02 1.70e-02 2.12e-02 9.57e-02 4.46e-02 7.81e-02 ph/cm2/s
Fluence Cutoff-PL 3.58e-09 3.41e-08 1.25e-07 1.10e-07 2.40e-07 2.69e-07 erg/cm2
Error 1.14e-08 3.22e-08 5.87e-08 7.39e-07 1.13e-07 7.29e-07 erg/cm2
Peak flux Cutoff-PL 3.94e-03 2.02e-02 3.99e-02 1.95e-02 7.92e-02 8.36e-02 ph/cm2/s
Error 1.42e-02 1.61e-02 1.90e-02 7.93e-02 3.86e-02 7.76e-02 ph/cm2/s
Fluence Band 3.79e-09 3.48e-08 1.26e-07 2.38e-07 2.41e-07 3.09e-07 erg/cm2
Error 5.78e-08 6.22e-07 1.04e-07 2.60e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.69e-03 1.80e-02 4.03e-02 3.65e-02 7.74e-02 1.22e-01 ph/cm2/s
Error 1.93e-02 1.95e-02 6.58e-02 3.41e-02 7.90e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.582 0.980 - - 7.25e-04 5.71e-04 51.336 57
CPL -2.498 0.000 98.3 51.3 9.24e-03 3.15e-02 50.130 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.582 0.980 - - 7.25e-04 5.71e-04 51.336 57
CPL -2.498 0.000 98.3 51.3 9.24e-03 3.15e-02 50.130 0
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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
57.5480 -12.2956 0.0534 45.9 -14.1 0.5788 3.6 TRIG_00145767
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.968 -45.612 (delta_t = 15.356 [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 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.581695 ( -1.14299 0.817798 )
Norm@50keV : 7.245898E-04 ( -7.245898E-04 4.178582E-04) )
------------------------------------------------------------
Chi-Squared = 51.33551 using 59 PHA bins.
Reduced chi-squared = 0.9006229 for 57 degrees of freedom
Null hypothesis probability = 0.687
Photon flux (15-150 keV) in 26.88 sec: 8.480771E-02 ( -0.042822 0.0464393 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51308e-07 ( -1.13023e-07 1.1322e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49774 ( )
Epeak [keV] : 98.2919 ( -36.0707 66.4609 )
Norm@50keV : 9.239781E-03 ( -1.446294E-02 4.863264E-02) )
------------------------------------------------------------
Chi-Squared = 50.12965 using 59 PHA bins.
but latest trial 37.3801 gives Chi-Squared = 11.4493
Reduced chi-squared = 0.8951723 for 56 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 26.88 sec: 7.921130E-02 ( -0.0348551 0.0423917 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39518e-07 ( -1.08067e-07 1.18174e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.742532 ( -14.9999 7.104874E-05) )
beta : -0.581390 ( -0.851550 1.13761 )
Epeak [keV] : 21.7247 ( -21.6247 9978.28 )
Norm@50keV : 9.635034E-04 ( -20.2117 58016.2 )
------------------------------------------------------------
Chi-Squared = 51.33551 using 59 PHA bins.
Reduced chi-squared = 0.9333730 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 26.88 sec: 7.737595E-02 ( -0.033002 0.0351941 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41258e-07 ( -1.04274e-07 1.0414e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.581695 ( -1.14299 0.817798 )
Norm@50keV : 7.245898E-04 ( -7.245898E-04 4.178582E-04) )
------------------------------------------------------------
Chi-Squared = 51.33551 using 59 PHA bins.
Reduced chi-squared = 0.9006229 for 57 degrees of freedom
Null hypothesis probability = 0.687
Photon flux (15-150 keV) in 26.88 sec: 8.480771E-02 ( -0.042822 0.0464393 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51308e-07 ( -1.13023e-07 1.1322e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49774 ( )
Epeak [keV] : 98.2919 ( -36.0707 66.4609 )
Norm@50keV : 9.239781E-03 ( -1.446294E-02 4.863264E-02) )
------------------------------------------------------------
Chi-Squared = 50.12965 using 59 PHA bins.
but latest trial 37.3801 gives Chi-Squared = 11.4493
Reduced chi-squared = 0.8951723 for 56 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 26.88 sec: 7.921130E-02 ( -0.0348551 0.0423917 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39518e-07 ( -1.08067e-07 1.18174e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.742532 ( -14.9999 7.104874E-05) )
beta : -0.581390 ( -0.851550 1.13761 )
Epeak [keV] : 21.7247 ( -21.6247 9978.28 )
Norm@50keV : 9.635034E-04 ( -20.2117 58016.2 )
------------------------------------------------------------
Chi-Squared = 51.33551 using 59 PHA bins.
Reduced chi-squared = 0.9333730 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 26.88 sec: 7.737595E-02 ( -0.033002 0.0351941 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41258e-07 ( -1.04274e-07 1.0414e-07 ) ergs/cm2
Plot creation:
Mon Jan 7 15:34:22 EST 2008