batgrbproduct Analysis for Trigger=142615
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 11:15:47 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger142615/SDC
======================================================================
Trigger: 00142615 Segment: 000
BAT Trigger Time: 141317881.536 [s; MET]
Trigger Stop: 141317897.92 [s; MET]
UTC: 2005-06-24T14:58:01.947680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 133.772013572539 Dec: -40.4551145647605 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.71
Image Trigger?: NO
Rate S/N Ratio: 19.672315572906 [ if not an image trigger ]
Image S/N Ratio: 17.71
Flight Position: [ source = BAT ]
RA: 133.772013572539 Dec: -40.4551145647605 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 133.757720233813 Dec: -40.4816420767149 [deg; J2000]
{ 08h 55m 01.9s , -40d 28' 53.9" }
+/- 1.56425747523241 [arcmin] (estimated 90% radius based on SNR)
+/- 0.608751263742839 [arcmin] (formal 1-sigma fit error)
SNR: 16.0522228874028
RA = 8h 55m 1.9s (133.757720 deg.)
Dec = -40d 28' 54" (-40.481642 deg.)
Angular difference between Flight and Ground position is 1.720180 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 17.9679999947548 +/- 24.0439059259554
Measured from: -4.35600000619888
to: 13.6119999885559 [s; relative to TRIGTIME]
T50: 10.0040000081062 +/- 5.65957172532967
Measured from: -0.140000015497208
to: 9.86399999260902 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.295999974012375
to: 1.29599997401237 [s; relative to TRIGTIME]
Total Fluence
Measured from: -32.4600000083447
to: 14.5199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.532208 0.506830 -0.009306 0.042264
0.027572 0.031510 0.030866 0.028569 [error]
Peak 0.024428 0.027493 0.004652 -0.001407
0.004121 0.004703 0.004491 0.004316 [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 2.04e-07 1.82e-07 1.12e-07 1.05e-07 5.43e-07 6.03e-07 erg/cm2
Error 2.04e-08 1.78e-08 2.26e-08 3.87e-08 5.43e-08 7.48e-08 erg/cm2
Peak flux Power-law 2.76e-01 1.77e-01 7.34e-02 4.14e-02 5.47e-01 5.67e-01 ph/cm2/s
Error 7.20e-02 4.19e-02 3.45e-02 3.63e-02 1.16e-01 1.25e-01 ph/cm2/s
Fluence Cutoff-PL 1.80e-07 2.23e-07 3.52e-08 2.11e-10 4.39e-07 4.39e-07 erg/cm2
Error 2.40e-08 2.43e-08 1.91e-08 7.96e-10 4.22e-08 4.22e-08 erg/cm2
Peak flux Cutoff-PL 2.69e-01 1.93e-01 6.34e-02 1.04e-02 5.34e-01 5.36e-01 ph/cm2/s
Error 7.93e-02 6.40e-02 5.39e-02 4.19e-02 1.22e-01 1.28e-01 ph/cm2/s
Fluence Band 1.86e-07 2.15e-07 5.74e-08 5.33e-09 4.48e-07 4.61e-07 erg/cm2
Error 2.48e-08 2.59e-08 1.52e-08 1.43e-08 4.17e-08 0.00e+00 erg/cm2
Peak flux Band 2.68e-01 1.94e-01 6.42e-02 2.42e-02 5.40e-01 5.53e-01 ph/cm2/s
Error 7.61e-02 4.19e-02 2.93e-02 4.03e-02 1.15e-01 1.30e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.701 0.190 - - 1.09e-03 1.61e-04 95.484 57
CPL -1.135 1.536 25.6 3.0 4.07e-01 1.83e+00 66.626 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.269 0.476 - - 3.18e-03 1.13e-03 45.563 57
CPL 1.776 2.540 15.8 5000.0 6.70e-03 2.93e+00 45.312 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 46.980 -32.460 14.520
T90 17.968 -4.356 13.612
T50 10.004 -0.140 9.864
Peak 1.000 0.296 1.296
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
133.7577 -40.4816 0.0120 31.4 -148.3 1.1257 16.1 TRIG_00142615
------------------------------------------
Foreground time interval of the image:
-32.460 14.520 (delta_t = 46.980 [sec])
Background time interval of the image:
-299.536 -32.460 (delta_t = 267.076 [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 -32.460 sec. to 14.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70063 ( -0.183982 0.195653 )
Norm@50keV : 1.086119E-03 ( -1.598527E-04 1.623820E-04) )
------------------------------------------------------------
Chi-Squared = 95.48435 using 59 PHA bins.
Reduced chi-squared = 1.675164 for 57 degrees of freedom
Null hypothesis probability = 1.062E-03
Photon flux (15-150 keV) in 46.98 sec: 0.242491 ( -0.019744 0.019745 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.42891e-07 ( -5.34022e-08 5.52203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -32.460 sec. to 14.520 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.13478 ( -1.86522 1.20596 )
Epeak [keV] : 25.5688 ( -3.12206 2.83802 )
Norm@50keV : 0.406698 ( -0.406698 3.24819 )
------------------------------------------------------------
Chi-Squared = 66.62649 using 59 PHA bins.
but latest trial 3.67195 gives Chi-Squared = 3.21489
Reduced chi-squared = 1.189759 for 56 degrees of freedom
Null hypothesis probability = 0.157
Photon flux (15-150 keV) in 46.98 sec: 0.220297 ( -0.01991 0.020048 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.39184e-07 ( -4.09745e-08 4.33616e-08 ) ergs/cm2
Band function
Time interval is from -32.460 sec. to 14.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48406 ( -1.35761 0.206018 )
beta : -7.40932 ( -3.15949 16.8405 )
Epeak [keV] : 15.3540 ( -19.8748 3.97174 )
Norm@50keV : 6.299610E-03 ( -8.113409E-03 2.064793E-02) )
------------------------------------------------------------
Chi-Squared = 80.56817 using 59 PHA bins.
Reduced chi-squared = 1.464876 for 55 degrees of freedom
Null hypothesis probability = 1.392E-02
Photon flux (15-150 keV) in 46.98 sec: 0.220740 ( -0.017407 0.017413 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47754e-07 ( -4.37637e-08 3.96727e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.296 sec. to 1.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26888 ( -0.428975 0.523288 )
Norm@50keV : 3.184067E-03 ( -1.148273E-03 1.120470E-03) )
------------------------------------------------------------
Chi-Squared = 45.56278 using 59 PHA bins.
Reduced chi-squared = 0.7993470 for 57 degrees of freedom
Null hypothesis probability = 0.862
Photon flux (15-150 keV) in 1.000 sec: 0.546982 ( -0.115812 0.116067 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02409e-08 ( -8.5644e-09 9.3953e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.296 sec. to 1.296 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77613 ( -4.77613 0.303796 )
Epeak [keV] : 15.7511 ( -15.7411 9984.25 )
Norm@50keV : 6.695108E-03 ( -6.695108E-03 5.85929 )
------------------------------------------------------------
Chi-Squared = 45.31187 using 59 PHA bins.
but latest trial 2.03999 gives Chi-Squared = 0.977730
Reduced chi-squared = 0.8091405 for 56 degrees of freedom
Null hypothesis probability = 0.846
Photon flux (15-150 keV) in 1.000 sec: 0.533564 ( -0.122346 0.120801 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71221e-08 ( -8.9581e-09 1.49087e-08 ) ergs/cm2
Band function
Time interval is from 0.296 sec. to 1.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36458 ( -8.63542 5.69968 )
beta : -9.24213 ( -7.30798 0.806115 )
Epeak [keV] : 24.2316 ( -23.5410 168.309 )
Norm@50keV : 1.230104E-02 ( -6.911353E-02 203.347 )
------------------------------------------------------------
Chi-Squared = 45.27745 using 59 PHA bins.
Reduced chi-squared = 0.8232265 for 55 degrees of freedom
Null hypothesis probability = 0.822
Photon flux (15-150 keV) in 1.000 sec: 0.539820 ( -0.114704 0.115342 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70253e-08 ( -8.4342e-09 8.4767e-09 ) ergs/cm2
Plot creation:
Mon Jan 7 11:30:22 EST 2008