batgrbproduct Analysis for Trigger=154112
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 20:10:40 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger154112/SDC
======================================================================
Trigger: 00154112 Segment: 000
BAT Trigger Time: 147850951.104 [s; MET]
Trigger Stop: 147850953.152 [s; MET]
UTC: 2005-09-08T05:42:31.386740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.4636377922441 Dec: -12.9713413289566 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.29
Image Trigger?: NO
Rate S/N Ratio: 9.38083151964686 [ if not an image trigger ]
Image S/N Ratio: 9.29
Flight Position: [ source = BAT ]
RA: 20.4636377922441 Dec: -12.9713413289566 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.4620939181142 Dec: -12.9516122045307 [deg; J2000]
{ 01h 21m 50.9s , -12d 57' 05.8" }
+/- 1.50477497010232 [arcmin] (estimated 90% radius based on SNR)
+/- 0.569548360798703 [arcmin] (formal 1-sigma fit error)
SNR: 16.9663171839676
RA = 1h 21m 50.9s (20.462094 deg.)
Dec = -12d 57' 6" (-12.951612 deg.)
Angular difference between Flight and Ground position is 1.187185 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 17.3719999790192 +/- 3.71168156757748
Measured from: -3.83199998736382
to: 13.5399999916553 [s; relative to TRIGTIME]
T50: 6.62799999117851 +/- 1.84988324280689
Measured from: -0.203999996185303
to: 6.42399999499321 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.67599999904633
to: 2.67599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.5
to: 15.83599999547 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.290107 0.354890 0.182085 0.026176
0.025831 0.026466 0.022914 0.019229 [error]
Peak 0.019713 0.036282 0.023355 0.006094
0.005497 0.005713 0.004932 0.003972 [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 9.62e-08 1.40e-07 1.52e-07 3.08e-07 4.83e-07 6.98e-07 erg/cm2
Error 1.29e-08 1.27e-08 2.21e-08 9.01e-08 5.14e-08 1.13e-07 erg/cm2
Peak flux Power-law 2.27e-01 2.31e-01 1.65e-01 1.87e-01 6.97e-01 8.10e-01 ph/cm2/s
Error 7.27e-02 4.73e-02 3.96e-02 9.03e-02 1.36e-01 1.59e-01 ph/cm2/s
Fluence Cutoff-PL 8.95e-08 1.53e-07 1.49e-07 1.00e-07 4.52e-07 4.97e-07 erg/cm2
Error 1.45e-08 1.77e-08 2.59e-08 1.28e-07 5.89e-08 1.42e-07 erg/cm2
Peak flux Cutoff-PL 1.85e-01 2.61e-01 1.80e-01 5.92e-02 6.70e-01 6.85e-01 ph/cm2/s
Error 8.76e-02 6.24e-02 4.86e-02 1.14e-01 1.41e-01 1.73e-01 ph/cm2/s
Fluence Band 8.85e-08 1.54e-07 1.43e-07 2.21e-07 4.64e-07 5.93e-07 erg/cm2
Error 1.39e-08 1.90e-08 2.20e-08 1.15e-07 5.24e-08 1.53e-07 erg/cm2
Peak flux Band 1.85e-01 2.61e-01 1.80e-01 5.93e-02 6.70e-01 6.85e-01 ph/cm2/s
Error 8.61e-02 5.96e-02 4.11e-02 1.09e-01 1.40e-01 1.56e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.881 0.166 - - 2.25e-03 2.40e-04 55.142 57
CPL 1.155 0.750 49.9 59.7 5.82e-03 8.38e-03 51.955 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.487 0.319 - - 5.60e-03 1.10e-03 58.508 57
CPL 0.233 1.764 69.0 4974.0 2.47e-02 1.44e-01 56.330 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: 7.552000 sec.
T50 in the 50-300 keV band: 3.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 23.336 -7.500 15.836
T90 17.372 -3.832 13.540
T50 6.628 -0.204 6.424
Peak 1.000 1.676 2.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.4621 -12.9516 0.0114 27.8 20.8 0.8815 17.0 TRIG_00154112
------------------------------------------
Foreground time interval of the image:
-7.500 15.836 (delta_t = 23.336 [sec])
Background time interval of the image:
-299.104 -7.500 (delta_t = 291.604 [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 -7.500 sec. to 15.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88130 ( -0.162778 0.168463 )
Norm@50keV : 2.251494E-03 ( -2.420554E-04 2.381064E-04) )
------------------------------------------------------------
Chi-Squared = 55.14179 using 59 PHA bins.
Reduced chi-squared = 0.9673998 for 57 degrees of freedom
Null hypothesis probability = 0.545
Photon flux (15-150 keV) in 23.34 sec: 0.320581 ( -0.029318 0.029338 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8308e-07 ( -5.10352e-08 5.18451e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.500 sec. to 15.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15544 ( -0.804209 0.696435 )
Epeak [keV] : 49.8606 ( -11.5951 107.859 )
Norm@50keV : 5.817044E-03 ( -5.817045E-03 1.094211E-02) )
------------------------------------------------------------
Chi-Squared = 51.95476 using 59 PHA bins.
Reduced chi-squared = 0.9277635 for 56 degrees of freedom
Null hypothesis probability = 0.629
Photon flux (15-150 keV) in 23.34 sec: 0.312508 ( -0.030369 0.030315 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.51655e-07 ( -5.80279e-08 5.96991e-08 ) ergs/cm2
Band function
Time interval is from -7.500 sec. to 15.836 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14887 ( -2.56020 2.30470 )
beta : -2.71565 ( -0.351653 0.318143 )
Epeak [keV] : 49.0855 ( -9.07127 29.8326 )
Norm@50keV : 5.917145E-03 ( -0.260264 93.8142 )
------------------------------------------------------------
Chi-Squared = 51.87090 using 59 PHA bins.
Reduced chi-squared = 0.9431073 for 55 degrees of freedom
Null hypothesis probability = 0.595
Photon flux (15-150 keV) in 23.34 sec: 0.314316 ( -0.029011 0.030372 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63574e-07 ( -5.25547e-08 5.23073e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.676 sec. to 2.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48657 ( -0.316703 0.320926 )
Norm@50keV : 5.599443E-03 ( -1.107114E-03 1.097240E-03) )
------------------------------------------------------------
Chi-Squared = 58.50774 using 59 PHA bins.
Reduced chi-squared = 1.026452 for 57 degrees of freedom
Null hypothesis probability = 0.420
Photon flux (15-150 keV) in 1.000 sec: 0.696532 ( -0.136243 0.136575 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.32438e-08 ( -1.13228e-08 1.14935e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.676 sec. to 2.676 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.232625 ( -2.13666 1.39225 )
Epeak [keV] : 68.9879 ( -17.0567 9931.01 )
Norm@50keV : 2.472693E-02 ( -1.960434E-02 0.268737 )
------------------------------------------------------------
Chi-Squared = 56.33022 using 59 PHA bins.
but latest trial 43.7798 gives Chi-Squared = 5.41787
Reduced chi-squared = 1.005897 for 56 degrees of freedom
Null hypothesis probability = 0.462
Photon flux (15-150 keV) in 1.000 sec: 0.669816 ( -0.141683 0.141061 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91967e-08 ( -1.19926e-08 1.26068e-08 ) ergs/cm2
Band function
Time interval is from 1.676 sec. to 2.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.233556 ( -1.39105 1.36414 )
beta : -9.26146 ( -7.53447 1.11956 )
Epeak [keV] : 68.9865 ( -65.2651 9934.63 )
Norm@50keV : 2.470416E-02 ( -2.873067E-02 51.7478 )
------------------------------------------------------------
Chi-Squared = 56.33022 using 59 PHA bins.
Reduced chi-squared = 1.024186 for 55 degrees of freedom
Null hypothesis probability = 0.425
Photon flux (15-150 keV) in 1.000 sec: 0.669919 ( -0.138711 0.140963 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92002e-08 ( -1.19829e-08 1.25605e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 20:22:58 EST 2008