batgrbproduct Analysis for Trigger=175942
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): Sat Dec 29 17:58:03 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger175942/SDC
======================================================================
Trigger: 00175942 Segment: 000
BAT Trigger Time: 158136568.384 [s; MET]
Trigger Stop: 158136569.408 [s; MET]
UTC: 2006-01-05T06:49:27.446760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.473683880003 Dec: 46.3625146711849 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.4
Image Trigger?: NO
Rate S/N Ratio: 77.7045687202497 [ if not an image trigger ]
Image S/N Ratio: 14.4
Flight Position: [ source = BAT ]
RA: 297.473683880003 Dec: 46.3625146711849 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 297.492797888824 Dec: 46.3578058653562 [deg; J2000]
{ 19h 49m 58.3s , +46d 21' 28.1" }
+/- 1.19361106181657 [arcmin] (estimated 90% radius based on SNR)
+/- 0.418063092413809 [arcmin] (formal 1-sigma fit error)
SNR: 23.6218729871097
RA = 19h 49m 58.3s (297.492798 deg.)
Dec = 46d 21' 28" (46.357806 deg.)
Angular difference between Flight and Ground position is 0.840377 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 54.3759999871254 +/- 1.58020250506331
Measured from: -17.8199999928474
to: 36.555999994278 [s; relative to TRIGTIME]
T50: 25.9280000329018 +/- 0.413627861713967
Measured from: 4.29999998211861
to: 30.2280000150204 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.8479999899864
to: 31.8479999899864 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.0480000078678
to: 66.5519999861717 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.256270 7.593177 8.407284 3.241764
0.090437 0.099831 0.098803 0.084434 [error]
Peak 0.141560 0.309319 0.349024 0.112981
0.011146 0.013434 0.014264 0.010615 [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 1.48e-06 3.48e-06 6.51e-06 2.94e-05 1.77e-05 3.58e-05 erg/cm2
Error 6.56e-08 8.98e-08 1.15e-07 1.32e-06 3.04e-07 0.00e+00 erg/cm2
Peak flux Power-law 1.74e+00 2.31e+00 2.25e+00 3.92e+00 7.59e+00 1.02e+01 ph/cm2/s
Error 1.70e-01 1.39e-01 1.09e-01 4.05e-01 3.71e-01 4.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.44e-06 3.48e-06 6.57e-06 2.74e-05 1.76e-05 2.84e-05 erg/cm2
Error 9.21e-08 9.04e-08 1.53e-07 3.30e-06 3.00e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.51e+00 2.37e+00 2.42e+00 2.53e+00 7.48e+00 8.83e+00 ph/cm2/s
Error 2.19e-01 1.51e-01 1.55e-01 7.17e-01 3.77e-01 7.98e-01 ph/cm2/s
Fluence Band 1.43e-06 3.47e-06 6.55e-06 2.74e-05 1.76e-05 2.84e-05 erg/cm2
Error 9.09e-08 8.99e-08 1.36e-07 3.29e-06 3.03e-07 0.00e+00 erg/cm2
Peak flux Band 1.44e+00 2.42e+00 2.38e+00 3.20e+00 7.42e+00 9.44e+00 ph/cm2/s
Error 2.55e-01 1.77e-01 1.64e-01 6.53e-01 3.87e-01 9.23e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.097 0.035 - - 1.93e-02 3.67e-04 32.309 57
CPL 1.064 0.115 1899.5 0.0 1.98e-02 1.56e-03 31.964 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.038 0.079 - - 6.58e-02 3.11e-03 49.944 57
CPL 0.516 0.358 170.5 122.5 1.11e-01 3.96e-02 42.953 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: 53.312000 sec.
T50 in the 50-300 keV band: 25.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 87.600 -21.048 66.552
T90 54.376 -17.820 36.556
T50 25.928 4.300 30.228
Peak 1.000 30.848 31.848
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
297.4928 +46.3578 0.0081 42.9 20.8 11.9224 23.6 TRIG_00175942
------------------------------------------
Foreground time interval of the image:
-21.048 19.021 (delta_t = 40.069 [sec])
Background time interval of the image:
-23.779 -21.048 (delta_t = 2.731 [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 -21.048 sec. to 66.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09670 ( -3.497481E-02 3.477871E-02) )
Norm@50keV : 1.926516E-02 ( -3.674552E-04 3.661681E-04) )
------------------------------------------------------------
Chi-Squared = 32.30888 using 59 PHA bins.
Reduced chi-squared = 0.5668224 for 57 degrees of freedom
Null hypothesis probability = 0.997
Photon flux (15-150 keV) in 87.60 sec: 2.23392 ( -0.04626 0.04643 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76648e-05 ( -3.05374e-07 3.02395e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.048 sec. to 66.552 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06433 ( -0.169388 5.974030E-02) )
Epeak [keV] : 1899.52 ( )
Norm@50keV : 1.981668E-02 ( -5.995128E-04 2.516344E-03) )
------------------------------------------------------------
Chi-Squared = 31.96351 using 59 PHA bins.
but latest trial 1.975056E-02 gives Chi-Squared = 3.27155
Reduced chi-squared = 0.5707770 for 56 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 87.60 sec: 2.23264 ( -0.04622 0.0464 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76424e-05 ( -3.00118e-07 2.99942e-07 ) ergs/cm2
Band function
Time interval is from -21.048 sec. to 66.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.829377 ( -9.17062 2.61551 )
beta : -1.09672 ( -8.72343 0.211635 )
Epeak [keV] : 65.3127 ( -990.507 9009.39 )
Norm@50keV : 3.477781E-02 ( -3.802460E-04 366593. )
------------------------------------------------------------
Chi-Squared = 32.30779 using 59 PHA bins.
Reduced chi-squared = 0.5874143 for 55 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 87.60 sec: 2.22246 ( -0.04984 0.054 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7629e-05 ( -3.0257e-07 3.03622e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 30.848 sec. to 31.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03771 ( -7.970440E-02 7.873917E-02) )
Norm@50keV : 6.577551E-02 ( -3.115863E-03 3.107220E-03) )
------------------------------------------------------------
Chi-Squared = 49.94405 using 59 PHA bins.
Reduced chi-squared = 0.8762115 for 57 degrees of freedom
Null hypothesis probability = 0.735
Photon flux (15-150 keV) in 1.000 sec: 7.59005 ( -0.3709 0.37157 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01956e-07 ( -3.3988e-08 3.4104e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.848 sec. to 31.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.516164 ( -0.373089 0.342080 )
Epeak [keV] : 170.514 ( -47.0594 198.013 )
Norm@50keV : 0.110612 ( -3.137274E-02 4.778782E-02) )
------------------------------------------------------------
Chi-Squared = 42.95350 using 59 PHA bins.
Reduced chi-squared = 0.7670268 for 56 degrees of freedom
Null hypothesis probability = 0.900
Photon flux (15-150 keV) in 1.000 sec: 7.48327 ( -0.37634 0.37675 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.96302e-07 ( -3.518e-08 3.5116e-08 ) ergs/cm2
Band function
Time interval is from 30.848 sec. to 31.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.858888 ( -9.14111 5.85727 )
beta : -1.03772 ( -7.872844E-02 7.972169E-02) )
Epeak [keV] : 50.8683 ( -2.929688E-03 1.953125E-03) )
Norm@50keV : 0.109227 ( -3.126211E-03 3.117546E-03) )
------------------------------------------------------------
Chi-Squared = 49.94404 using 59 PHA bins.
Reduced chi-squared = 0.9080734 for 55 degrees of freedom
Null hypothesis probability = 0.668
Photon flux (15-150 keV) in 1.000 sec: 7.41580 ( -0.38931 0.38434 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9595e-07 ( -3.5312e-08 3.4966e-08 ) ergs/cm2
Plot creation:
Sat Dec 29 18:24:47 EST 2007