batgrbproduct Analysis for Trigger=141098
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): Thu Jan 10 18:31:15 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger141098/SDC
======================================================================
Trigger: 00141098 Segment: 000
BAT Trigger Time: 140464551.168 [s; MET]
Trigger Stop: 140464559.36 [s; MET]
UTC: 2005-06-14T17:55:51.595660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.5670337552 Dec: -40.4338194119298 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.79
Image Trigger?: NO
Rate S/N Ratio: 16.7332005306815 [ if not an image trigger ]
Image S/N Ratio: 7.79
Flight Position: [ source = BAT ]
RA: 135.5670337552 Dec: -40.4338194119298 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.686727209272 Dec: -40.3581247439807 [deg; J2000]
{ 09h 02m 44.8s , -40d 21' 29.2" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 2.09677976933467 [arcmin] (formal 1-sigma fit error)
SNR: -5.61483004499018
RA = 9h 2m 44.8s (135.686727 deg.)
Dec = -40d 21' 29" (-40.358125 deg.)
Angular difference between Flight and Ground position is 7.109229 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 6.27200001478195 +/- 4.41785467641709
Measured from: 9.03199997544289
to: 15.3039999902248 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/- 4.04011881425091
Measured from: 9.41599997878075
to: 10.4399999976158 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 12.1480000019073
to: 13.1480000019073 [s; relative to TRIGTIME]
Total Fluence
Measured from: 8.83999997377396
to: 23.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.224219 0.215511 0.015531 -0.020055
0.016910 0.017550 0.015402 0.015548 [error]
Peak 0.021443 0.019630 0.010224 0.002554
0.004426 0.004533 0.003929 0.004029 [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 7.10e-08 6.97e-08 4.79e-08 5.19e-08 2.09e-07 2.40e-07 erg/cm2
Error 8.77e-09 8.45e-09 1.13e-08 2.23e-08 2.75e-08 4.02e-08 erg/cm2
Peak flux Power-law 1.86e-01 1.53e-01 8.56e-02 7.05e-02 4.56e-01 4.96e-01 ph/cm2/s
Error 6.62e-02 3.63e-02 3.49e-02 5.78e-02 1.08e-01 1.22e-01 ph/cm2/s
Fluence Cutoff-PL 6.48e-08 9.07e-08 1.47e-08 7.29e-11 1.70e-07 1.70e-07 erg/cm2
Error 1.02e-08 1.22e-08 1.09e-08 5.15e-10 2.06e-08 2.06e-08 erg/cm2
Peak flux Cutoff-PL 1.86e-01 1.53e-01 8.56e-02 7.00e-02 4.56e-01 4.95e-01 ph/cm2/s
Error 6.61e-02 3.63e-02 3.49e-02 5.74e-02 1.08e-01 1.22e-01 ph/cm2/s
Fluence Band 7.12e-08 7.07e-08 4.92e-08 5.41e-08 2.13e-07 2.42e-07 erg/cm2
Error 8.13e-09 7.35e-09 5.79e-09 1.55e-08 2.21e-08 2.52e-08 erg/cm2
Peak flux Band 1.74e-01 1.53e-01 8.70e-02 7.02e-02 4.58e-01 5.03e-01 ph/cm2/s
Error 4.06e-02 3.70e-02 3.65e-02 5.34e-02 1.09e-01 7.14e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.540 0.218 - - 1.44e-03 2.53e-04 73.555 57
CPL -1.511 1.513 27.4 3.0 7.62e-01 0.00e+00 49.922 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.841 0.490 - - 3.26e-03 9.95e-04 49.429 57
CPL 2.067 0.951 28.2 5000.0 2.47e-03 1.33e-02 49.304 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 14.336 8.840 23.176
T90 6.272 9.032 15.304
T50 1.024 9.416 10.440
Peak 1.000 12.148 13.148
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.6867 -40.3581 0.0344 12.5 -51.7 -0.2355 -5.6 TRIG_00141098
------------------------------------------
Foreground time interval of the image:
8.840 23.176 (delta_t = 14.336 [sec])
Background time interval of the image:
-10.168 8.840 (delta_t = 19.008 [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 8.840 sec. to 23.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54036 ( -0.210584 0.225373 )
Norm@50keV : 1.443671E-03 ( -2.511219E-04 2.555100E-04) )
------------------------------------------------------------
Chi-Squared = 73.55531 using 59 PHA bins.
Reduced chi-squared = 1.290444 for 57 degrees of freedom
Null hypothesis probability = 6.907E-02
Photon flux (15-150 keV) in 14.34 sec: 0.290767 ( -0.030332 0.030345 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09363e-07 ( -2.69076e-08 2.80376e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.840 sec. to 23.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.51126 ( -1.48874 1.53694 )
Epeak [keV] : 27.3612 ( -3.17270 2.92235 )
Norm@50keV : 0.761572 ( )
------------------------------------------------------------
Chi-Squared = 49.92220 using 59 PHA bins.
Reduced chi-squared = 0.8914679 for 56 degrees of freedom
Null hypothesis probability = 0.703
Photon flux (15-150 keV) in 14.34 sec: 0.272975 ( -0.029447 0.030054 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70232e-07 ( -1.96128e-08 2.16132e-08 ) ergs/cm2
Band function
Time interval is from 8.840 sec. to 23.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.993693 ( -0.417103 2.24030 )
beta : -9.23113 ( -5.722046E-06 0.768252 )
Epeak [keV] : 21.9280 ( -3.30387 2.76068 )
Norm@50keV : 1.546955E-02 ( -1.25817 69.0342 )
------------------------------------------------------------
Chi-Squared = 57.45561 using 59 PHA bins.
Reduced chi-squared = 1.044647 for 55 degrees of freedom
Null hypothesis probability = 0.384
Photon flux (15-150 keV) in 14.34 sec: 0.273350 ( -0.029598 0.014954 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12724e-07 ( -2.20836e-08 2.20908e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 12.168 sec. to 13.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84059 ( -0.460638 0.520316 )
Norm@50keV : 3.258859E-03 ( -1.033286E-03 9.559868E-04) )
------------------------------------------------------------
Chi-Squared = 49.42927 using 59 PHA bins.
Reduced chi-squared = 0.8671802 for 57 degrees of freedom
Null hypothesis probability = 0.752
Photon flux (15-150 keV) in 0.9600 sec: 0.456326 ( -0.107969 0.107968 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87721e-08 ( -8.58835e-09 9.06269e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.168 sec. to 13.128 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06664 ( -1.87971 2.254200E-02) )
Epeak [keV] : 28.2398 ( -28.2277 9971.76 )
Norm@50keV : 2.465611E-03 ( -1.135465E-03 2.541090E-02) )
------------------------------------------------------------
Chi-Squared = 49.30409 using 59 PHA bins.
but latest trial 4.841522E-04 gives Chi-Squared = 10.7362
Reduced chi-squared = 0.8804302 for 56 degrees of freedom
Null hypothesis probability = 0.724
Photon flux (15-150 keV) in 0.9600 sec: 0.456175 ( -0.107937 0.107937 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87699e-08 ( -8.59997e-09 9.06374e-09 ) ergs/cm2
Band function
Time interval is from 12.168 sec. to 13.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52991 ( -8.47009 6.52991 )
beta : -1.83826 ( -8.16174 0.458049 )
Epeak [keV] : 25.5025 ( -25.4025 9974.50 )
Norm@50keV : 6.222572E-03 ( -6.222572E-03 13.9086 )
------------------------------------------------------------
Chi-Squared = 49.42730 using 59 PHA bins.
Reduced chi-squared = 0.8986782 for 55 degrees of freedom
Null hypothesis probability = 0.687
Photon flux (15-150 keV) in 0.9600 sec: 0.458099 ( -0.109134 0.108469 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88291e-08 ( -8.1432e-09 8.98896e-09 ) ergs/cm2
Plot creation:
Thu Jan 10 18:37:24 EST 2008