batgrbproduct Analysis for Trigger=131113
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): Sun Jan 6 18:26:35 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131113/SDC
======================================================================
Trigger: 00131113 Segment: 000
BAT Trigger Time: 139275116.992 [s; MET]
Trigger Stop: 139275143.872 [s; MET]
UTC: 2005-05-31T23:31:57.441900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.212223333458 Dec: 34.2112205834325 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 7 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 297.212223333458 Dec: 34.2112205834325 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 296.987770537855 Dec: 34.1692396254065 [deg; J2000]
{ 19h 47m 57.1s , +34d 10' 09.3" }
+/- 2.03204753772528 [arcmin] (estimated 90% radius based on SNR)
+/- 1.01484584309483 [arcmin] (formal 1-sigma fit error)
SNR: 11.0461989403178
RA = 19h 47m 57.1s (296.987771 deg.)
Dec = 34d 10' 9" (34.169240 deg.)
Angular difference between Flight and Ground position is 11.420946 arcmin
Partial Coding Fraction: 0.3632812 [ including projection effects ]
Duration
T90: 32.4120000302792 +/- 8.71886689331203
Measured from: -39.7480000257492
to: -7.33599999547005 [s; relative to TRIGTIME]
T50: 12.1839999854565 +/- 7.67792314923996
Measured from: -29.5600000023842
to: -17.3760000169277 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -11.4160000085831
to: -10.4160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: -43.4480000138283
to: -7.05200001597404 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.159277 0.174776 0.092410 0.040445
0.047494 0.048853 0.043588 0.040948 [error]
Peak 0.017685 0.013531 0.013047 0.012533
0.008017 0.007951 0.006858 0.006564 [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 6.11e-08 7.94e-08 7.55e-08 1.27e-07 2.58e-07 3.42e-07 erg/cm2
Error 2.48e-08 2.45e-08 4.27e-08 1.68e-07 9.77e-08 2.00e-07 erg/cm2
Peak flux Power-law 1.25e-01 1.34e-01 1.01e-01 1.25e-01 4.08e-01 4.85e-01 ph/cm2/s
Error 1.31e-01 1.04e-01 7.97e-02 2.48e-01 3.09e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 6.12e-08 7.95e-08 7.54e-08 1.26e-07 2.58e-07 3.41e-07 erg/cm2
Error 2.48e-08 2.45e-08 4.28e-08 1.51e-07 9.77e-08 1.99e-07 erg/cm2
Peak flux Cutoff-PL 1.25e-01 1.34e-01 1.01e-01 1.24e-01 4.07e-01 4.84e-01 ph/cm2/s
Error 1.31e-01 1.04e-01 7.98e-02 2.47e-01 3.08e-01 2.34e-01 ph/cm2/s
Fluence Band 6.18e-08 8.13e-08 7.29e-08 1.13e-07 2.52e-07 3.41e-07 erg/cm2
Error 2.62e-08 2.67e-08 3.74e-08 9.66e-08 1.63e-07 0.00e+00 erg/cm2
Peak flux Band 9.57e-02 1.19e-01 1.08e-01 1.71e-01 3.82e-01 4.95e-01 ph/cm2/s
Error 4.55e-02 4.84e-02 5.16e-02 1.90e-01 2.13e-01 3.65e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.074 0.639 - - 7.66e-04 3.18e-04 45.662 57
CPL 1.999 1.245 6.2 0.0 7.95e-04 3.20e-04 45.703 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.403 1.377 - - 3.35e-03 1.71e-03 44.169 57
CPL 1.400 1.387 9991.6 5000.0 3.36e-03 1.73e-03 44.173 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 36.396 -43.448 -7.052
T90 32.412 -39.748 -7.336
T50 12.184 -29.560 -17.376
Peak 1.000 -11.416 -10.416
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
296.9878 +34.1692 0.0174 37.2 30.7 1.0618 11.0 TRIG_00131113
------------------------------------------
Foreground time interval of the image:
-43.448 -7.052 (delta_t = 36.396 [sec])
Background time interval of the image:
-299.992 -43.448 (delta_t = 256.544 [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 -43.448 sec. to -7.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07382 ( -0.583511 0.693747 )
Norm@50keV : 7.657964E-04 ( -3.300530E-04 3.055299E-04) )
------------------------------------------------------------
Chi-Squared = 45.66190 using 59 PHA bins.
Reduced chi-squared = 0.8010860 for 57 degrees of freedom
Null hypothesis probability = 0.860
Photon flux (15-150 keV) in 36.40 sec: 0.118947 ( -0.0350729 0.035073 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58358e-07 ( -9.41825e-08 1.0127e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -43.448 sec. to -7.052 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99948 ( -2.47219 1.769900E-02) )
Epeak [keV] : 6.20504 ( )
Norm@50keV : 7.945354E-04 ( -3.487718E-04 2.918263E-04) )
------------------------------------------------------------
Chi-Squared = 45.70299 using 59 PHA bins.
but latest trial 2.01579 gives Chi-Squared = 0.00000
Reduced chi-squared = 0.8161249 for 56 degrees of freedom
Null hypothesis probability = 0.835
Photon flux (15-150 keV) in 36.40 sec: 0.118905 ( -0.0350626 0.035062 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58255e-07 ( -9.39906e-08 1.01323e-07 ) ergs/cm2
Band function
Time interval is from -43.448 sec. to -7.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35416 ( -8.64584 6.35416 )
beta : -2.09879 ( -7.90121 0.602867 )
Epeak [keV] : 25.3878 ( -25.2878 183.363 )
Norm@50keV : 2.447398E-03 ( -0.491268 518.633 )
------------------------------------------------------------
Chi-Squared = 45.61048 using 59 PHA bins.
Reduced chi-squared = 0.8292814 for 55 degrees of freedom
Null hypothesis probability = 0.813
Photon flux (15-150 keV) in 36.40 sec: 0.119915 ( -0.03565 0.035179 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51907e-07 ( -9.71516e-08 9.60534e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -11.416 sec. to -10.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40286 ( -1.43594 1.31744 )
Norm@50keV : 3.346250E-03 ( -1.840936E-03 1.583841E-03) )
------------------------------------------------------------
Chi-Squared = 44.16881 using 59 PHA bins.
Reduced chi-squared = 0.7748914 for 57 degrees of freedom
Null hypothesis probability = 0.893
Photon flux (15-150 keV) in 1.000 sec: 0.407568 ( -0.407568 0.209509 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23215e-08 ( -1.74079e-08 1.74036e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.416 sec. to -10.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39987 ( -1.44747 1.32559 )
Epeak [keV] : 9991.58 ( -9991.57 8.42383 )
Norm@50keV : 3.357493E-03 ( -1.859632E-03 1.590747E-03) )
------------------------------------------------------------
Chi-Squared = 44.17312 using 59 PHA bins.
Reduced chi-squared = 0.7888058 for 56 degrees of freedom
Null hypothesis probability = 0.874
Photon flux (15-150 keV) in 1.000 sec: 0.407331 ( -0.407331 0.209471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23559e-08 ( -3.23559e-08 1.73948e-08 ) ergs/cm2
Band function
Time interval is from -11.416 sec. to -10.416 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12667 ( -8.87333 6.12667 )
beta : -1.39517 ( -8.60483 1.42825 )
Epeak [keV] : 33.5635 ( -33.4635 9966.44 )
Norm@50keV : 6.699467E-03 ( -6.699467E-03 244.150 )
------------------------------------------------------------
Chi-Squared = 44.16891 using 59 PHA bins.
Reduced chi-squared = 0.8030710 for 55 degrees of freedom
Null hypothesis probability = 0.852
Photon flux (15-150 keV) in 1.000 sec: 0.382298 ( -0.182266 0.243899 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2403e-08 ( -1.53078e-08 1.72902e-08 ) ergs/cm2
Plot creation:
Sun Jan 6 18:36:39 EST 2008