batgrbproduct Analysis for Trigger=150139
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): Tue Jan 8 15:58:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger150139/GCN5_download_cron
======================================================================
Trigger: 00150139 Segment: 000
BAT Trigger Time: 145608309.44 [s; MET]
Trigger Stop: 145608309.952 [s; MET]
UTC: 2005-08-13T06:45:09.768120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 242.009891218405 Dec: 11.2520458868854 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.27
Image Trigger?: NO
Rate S/N Ratio: 7.74596669241483 [ if not an image trigger ]
Image S/N Ratio: 7.27
Flight Position: [ source = BAT ]
RA: 242.009891218405 Dec: 11.2520458868854 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 242.00072665144 Dec: 11.2439987636013 [deg; J2000]
{ 16h 08m 00.2s , +11d 14' 38.4" }
+/- 2.96145671464477 [arcmin] (estimated 90% radius based on SNR)
+/- 1.59903363799921 [arcmin] (formal 1-sigma fit error)
SNR: 6.44969610953533
RA = 16h 8m 0.2s (242.000727 deg.)
Dec = 11d 14' 38" (11.243999 deg.)
Angular difference between Flight and Ground position is 0.723864 arcmin
Partial Coding Fraction: 0.4765625 [ including projection effects ]
Duration
T90: 0.448000013828278 +/- 0.143108347361266
Measured from: 0.0160000026226044
to: 0.464000016450882 [s; relative to TRIGTIME]
T50: 0.256000012159348 +/- 0.202385775151424
Measured from: 0.0800000131130219
to: 0.336000025272369 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.196000009775162
to: 0.803999990224838 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0160000026226044
to: 0.527999997138977 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.011182 0.028528 0.023131 -0.001679
0.005125 0.005280 0.004863 0.004459 [error]
Peak 0.011090 0.031156 0.021330 -0.000126
0.005374 0.005538 0.005076 0.004692 [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 4.58e-09 9.62e-09 1.59e-08 5.91e-08 4.37e-08 8.98e-08 erg/cm2
Error 1.81e-09 2.44e-09 4.35e-09 3.46e-08 1.11e-08 3.78e-08 erg/cm2
Peak flux Power-law 2.65e-01 3.03e-01 2.49e-01 3.43e-01 9.43e-01 1.16e+00 ph/cm2/s
Error 1.06e-01 7.92e-02 6.76e-02 1.86e-01 2.26e-01 2.83e-01 ph/cm2/s
Fluence Cutoff-PL 3.26e-09 1.19e-08 1.75e-08 6.74e-09 3.79e-08 4.04e-08 erg/cm2
Error 2.00e-09 3.41e-09 6.01e-09 1.82e-08 1.17e-08 2.12e-08 erg/cm2
Peak flux Cutoff-PL 1.73e-01 3.83e-01 2.77e-01 4.11e-02 8.70e-01 8.74e-01 ph/cm2/s
Error 1.11e-01 1.14e-01 9.86e-02 9.38e-02 2.26e-01 2.36e-01 ph/cm2/s
Fluence Band 2.99e-09 1.19e-08 1.68e-08 1.48e-08 3.86e-08 3.74e-08 erg/cm2
Error 1.90e-09 3.02e-09 4.97e-09 3.08e-08 1.09e-08 0.00e+00 erg/cm2
Peak flux Band 1.85e-01 3.78e-01 2.79e-01 5.03e-02 8.84e-01 8.91e-01 ph/cm2/s
Error 5.24e-02 8.79e-02 5.67e-02 1.66e-01 1.53e-01 2.04e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.277 0.369 - - 8.60e-03 2.00e-03 70.465 57
CPL -0.937 1.952 65.9 48.8 1.11e-01 4.22e-01 65.930 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.285 0.369 - - 7.92e-03 1.86e-03 71.226 57
CPL -1.362 1.840 60.4 32.4 1.86e-01 4.72e-01 65.675 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 0.512 0.016 0.528
T90 0.448 0.016 0.464
T50 0.256 0.080 0.336
Peak 1.000 -0.196 0.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
242.0007 +11.2440 0.0297 27.0 110.4 0.0611 6.4 TRIG_00150139
------------------------------------------
Foreground time interval of the image:
0.016 0.528 (delta_t = 0.512 [sec])
Background time interval of the image:
-299.440 0.016 (delta_t = 299.456 [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 0.016 sec. to 0.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27709 ( -0.373633 0.364102 )
Norm@50keV : 8.598684E-03 ( -1.996562E-03 1.995511E-03) )
------------------------------------------------------------
Chi-Squared = 70.46513 using 59 PHA bins.
Reduced chi-squared = 1.236230 for 57 degrees of freedom
Null hypothesis probability = 0.108
Photon flux (15-150 keV) in 0.5120 sec: 1.02160 ( -0.241996 0.24322 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37402e-08 ( -1.09417e-08 1.11985e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 0.528 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.936733 ( -2.06327 1.84026 )
Epeak [keV] : 65.9266 ( -17.0668 80.6188 )
Norm@50keV : 0.110766 ( -0.110766 0.733921 )
------------------------------------------------------------
Chi-Squared = 65.93032 using 59 PHA bins.
but latest trial 0.865898 gives Chi-Squared = 3.01729
Reduced chi-squared = 1.177327 for 56 degrees of freedom
Null hypothesis probability = 0.171
Photon flux (15-150 keV) in 0.5120 sec: 0.953584 ( -0.243641 0.249126 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79052e-08 ( -1.09999e-08 1.24033e-08 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 0.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.934956 ( -1.83807 2.16321 )
beta : -9.32844 ( -0.671561 19.3284 )
Epeak [keV] : 66.1209 ( -16.2128 80.2885 )
Norm@50keV : 0.109850 ( -0.109850 0.185078 )
------------------------------------------------------------
Chi-Squared = 65.93058 using 59 PHA bins.
Reduced chi-squared = 1.198738 for 55 degrees of freedom
Null hypothesis probability = 0.149
Photon flux (15-150 keV) in 0.5120 sec: 0.953814 ( -0.215869 0.263896 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85748e-08 ( -9.59196e-09 1.22898e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.016 sec. to 0.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28483 ( -0.374400 0.363796 )
Norm@50keV : 7.922579E-03 ( -1.863823E-03 1.861933E-03) )
------------------------------------------------------------
Chi-Squared = 71.22615 using 59 PHA bins.
Reduced chi-squared = 1.249582 for 57 degrees of freedom
Null hypothesis probability = 9.738E-02
Photon flux (15-150 keV) in 0.5760 sec: 0.942526 ( -0.225191 0.226284 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52864e-08 ( -1.15205e-08 1.17447e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 0.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36170 ( -1.63830 2.04229 )
Epeak [keV] : 60.3772 ( -14.5879 50.2011 )
Norm@50keV : 0.185935 ( -0.185935 0.757681 )
------------------------------------------------------------
Chi-Squared = 65.67545 using 59 PHA bins.
Reduced chi-squared = 1.172776 for 56 degrees of freedom
Null hypothesis probability = 0.177
Photon flux (15-150 keV) in 0.5760 sec: 0.869933 ( -0.221289 0.231377 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74534e-08 ( -1.09895e-08 1.31236e-08 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 0.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.33325 ( -4.04671 1.31541 )
beta : -9.19112 ( -7.72427 12.2756 )
Epeak [keV] : 61.0913 ( -16.0263 19.6134 )
Norm@50keV : 0.175492 ( -19.5297 5.39747 )
------------------------------------------------------------
Chi-Squared = 65.67948 using 59 PHA bins.
Reduced chi-squared = 1.194172 for 55 degrees of freedom
Null hypothesis probability = 0.153
Photon flux (15-150 keV) in 0.5760 sec: 0.883619 ( -0.196623 0.110038 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23489e-08 ( -1.37862e-08 9.89775e-09 ) ergs/cm2
Plot creation:
Tue Jan 8 16:11:50 EST 2008