batgrbproduct Analysis for Trigger=181126
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): Mon Dec 31 12:14:05 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger181126/SDC
======================================================================
Trigger: 00181126 Segment: 000
BAT Trigger Time: 161343552 [s; MET]
Trigger Stop: 161343680 [s; MET]
UTC: 2006-02-11T09:39:10.990840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 58.4020233754094 Dec: 21.4858393231787 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.55
Flight Position: [ source = BAT ]
RA: 58.4020233754094 Dec: 21.4858393231787 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 58.3855065887457 Dec: 21.4914665723574 [deg; J2000]
{ 03h 53m 32.5s , +21d 29' 29.3" }
+/- 1.49687074381577 [arcmin] (estimated 90% radius based on SNR)
+/- 0.602140349944848 [arcmin] (formal 1-sigma fit error)
SNR: 17.0944484908564
RA = 3h 53m 32.5s (58.385507 deg.)
Dec = 21d 29' 29" (21.491467 deg.)
Angular difference between Flight and Ground position is 0.981991 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 126.340000003576 +/- 9.21264543984781
Measured from: 54.0480000078678
to: 180.388000011444 [s; relative to TRIGTIME]
T50: 75.6920000016689 +/- 5.98001104043799
Measured from: 81.4320000112057
to: 157.124000012875 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 145.583999991417
to: 146.583999991417 [s; relative to TRIGTIME]
Total Fluence
Measured from: 47.83599999547
to: 191 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.068943 1.219388 0.728482 0.028342
0.059267 0.060437 0.054961 0.052396 [error]
Peak 0.015675 0.022663 0.012484 0.003052
0.005094 0.005169 0.004790 0.004360 [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 3.02e-07 4.74e-07 5.59e-07 1.28e-06 1.71e-06 2.61e-06 erg/cm2
Error 2.99e-08 2.92e-08 5.24e-08 2.49e-07 1.21e-07 2.96e-07 erg/cm2
Peak flux Power-law 1.33e-01 1.39e-01 1.02e-01 1.20e-01 4.20e-01 4.94e-01 ph/cm2/s
Error 5.75e-02 3.98e-02 3.61e-02 8.51e-02 1.17e-01 1.43e-01 ph/cm2/s
Fluence Cutoff-PL 2.66e-07 5.18e-07 5.61e-07 3.66e-07 1.57e-06 1.72e-06 erg/cm2
Error 3.58e-08 3.79e-08 6.02e-08 2.39e-07 1.37e-07 2.75e-07 erg/cm2
Peak flux Cutoff-PL 9.81e-02 1.85e-01 9.30e-02 6.92e-03 3.83e-01 3.83e-01 ph/cm2/s
Error 6.14e-02 6.16e-02 5.28e-02 5.06e-02 1.17e-01 1.21e-01 ph/cm2/s
Fluence Band 2.64e-07 5.17e-07 5.60e-07 3.65e-07 1.57e-06 1.71e-06 erg/cm2
Error 3.54e-08 3.78e-08 6.00e-08 2.37e-07 1.37e-07 2.75e-07 erg/cm2
Peak flux Band 9.81e-02 1.81e-01 9.74e-02 3.09e-02 3.97e-01 4.07e-01 ph/cm2/s
Error 6.58e-02 5.15e-02 3.94e-02 7.84e-02 1.14e-01 1.42e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.762 0.115 - - 1.29e-03 8.83e-05 71.585 57
CPL 0.853 0.527 57.9 13.1 3.94e-03 2.80e-03 60.613 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.446 0.450 - - 3.41e-03 9.87e-04 38.420 57
CPL -1.230 2.151 50.9 75.5 1.12e-01 4.03e-01 35.130 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: 27.904000 sec.
T50 in the 50-300 keV band: 15.360000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 143.164 47.836 191.000
T90 126.340 54.048 180.388
T50 75.692 81.432 157.124
Peak 1.000 145.584 146.584
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
58.3855 +21.4915 0.0112 5.6 178.2 1.7083 17.1 TRIG_00181126
------------------------------------------
Foreground time interval of the image:
47.836 141.005 (delta_t = 93.169 [sec])
Background time interval of the image:
-299.000 47.836 (delta_t = 346.836 [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 47.836 sec. to 191.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76157 ( -0.113702 0.115618 )
Norm@50keV : 1.293749E-03 ( -8.867180E-05 8.791313E-05) )
------------------------------------------------------------
Chi-Squared = 71.58496 using 59 PHA bins.
Reduced chi-squared = 1.255877 for 57 degrees of freedom
Null hypothesis probability = 9.249E-02
Photon flux (15-150 keV) in 143.2 sec: 0.175689 ( -0.010951 0.010965 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70839e-06 ( -1.20689e-07 1.22121e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 47.836 sec. to 191.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.853445 ( -0.562133 0.492493 )
Epeak [keV] : 57.9474 ( -8.39844 17.7819 )
Norm@50keV : 3.944150E-03 ( -1.758890E-03 3.846571E-03) )
------------------------------------------------------------
Chi-Squared = 60.61331 using 59 PHA bins.
Reduced chi-squared = 1.082381 for 56 degrees of freedom
Null hypothesis probability = 0.313
Photon flux (15-150 keV) in 143.2 sec: 0.167411 ( -0.011763 0.01176 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5713e-06 ( -1.35625e-07 1.39305e-07 ) ergs/cm2
Band function
Time interval is from 47.836 sec. to 191.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.860822 ( -0.485103 0.569857 )
beta : -8.69464 ( -1.30536 6.50108 )
Epeak [keV] : 58.0402 ( -8.34758 17.7204 )
Norm@50keV : 3.909019E-03 ( -1.724177E-03 3.874436E-03) )
------------------------------------------------------------
Chi-Squared = 60.61449 using 59 PHA bins.
Reduced chi-squared = 1.102082 for 55 degrees of freedom
Null hypothesis probability = 0.281
Photon flux (15-150 keV) in 143.2 sec: 0.167419 ( -0.011772 0.011753 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5697e-06 ( -1.35224e-07 1.39362e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 145.584 sec. to 146.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44603 ( -0.447343 0.453265 )
Norm@50keV : 3.410589E-03 ( -9.935491E-04 9.800247E-04) )
------------------------------------------------------------
Chi-Squared = 38.42007 using 59 PHA bins.
Reduced chi-squared = 0.6740363 for 57 degrees of freedom
Null hypothesis probability = 0.972
Photon flux (15-150 keV) in 1.000 sec: 0.419972 ( -0.116636 0.116777 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2669e-08 ( -1.02437e-08 1.07108e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 145.584 sec. to 146.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.23044 ( -1.76956 2.53227 )
Epeak [keV] : 50.8814 ( -13.8254 137.203 )
Norm@50keV : 0.112215 ( -0.112215 0.694453 )
------------------------------------------------------------
Chi-Squared = 35.12952 using 59 PHA bins.
Reduced chi-squared = 0.6273130 for 56 degrees of freedom
Null hypothesis probability = 0.987
Photon flux (15-150 keV) in 1.000 sec: 0.382977 ( -0.111271 0.122477 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4845e-08 ( -8.2968e-09 1.27808e-08 ) ergs/cm2
Band function
Time interval is from 145.584 sec. to 146.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.00293 ( -2.00481 3.90206 )
beta : -6.72258 ( -3.27742 16.7176 )
Epeak [keV] : 53.8886 ( -23.6463 155.676 )
Norm@50keV : 7.633511E-02 ( -8.93847 10.5491 )
------------------------------------------------------------
Chi-Squared = 35.21089 using 59 PHA bins.
Reduced chi-squared = 0.6401981 for 55 degrees of freedom
Null hypothesis probability = 0.983
Photon flux (15-150 keV) in 1.000 sec: 0.397015 ( -0.105752 0.12211 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80433e-08 ( -7.5872e-09 1.1849e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 12:24:35 EST 2007