batgrbproduct Analysis for Trigger=130088
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 17:49:26 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger130088/SDC
======================================================================
Trigger: 00130088 Segment: 000
BAT Trigger Time: 138672173.056 [s; MET]
Trigger Stop: 138672173.12 [s; MET]
UTC: 2005-05-25T00:02:53.517080 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 278.144062379166 Dec: 26.3398415321529 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18
Image Trigger?: NO
Rate S/N Ratio: 81.2834546509928 [ if not an image trigger ]
Image S/N Ratio: 18
Flight Position: [ source = BAT ]
RA: 278.144062379166 Dec: 26.3398415321529 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.138070378198 Dec: 26.3399546126458 [deg; J2000]
{ 18h 32m 33.1s , +26d 20' 23.8" }
+/- 0.341179792846733 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0958651490853603 [arcmin] (formal 1-sigma fit error)
SNR: 141.346510925587
RA = 18h 32m 33.1s (278.138070 deg.)
Dec = 26d 20' 24" (26.339955 deg.)
Angular difference between Flight and Ground position is 0.322265 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 8.82800000905991 +/- 0.0670522316699982
Measured from: 0.328000009059906
to: 9.15600001811981 [s; relative to TRIGTIME]
T50: 5.21999999880791 +/- 0.0256125069658732
Measured from: 1.37200000882149
to: 6.59200000762939 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.543999999761581
to: 1.54399999976158 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.120000004768372
to: 12.6759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.216602 10.254482 6.908501 1.126153
0.039155 0.045384 0.039326 0.023794 [error]
Peak 1.115656 1.985209 1.715138 0.358720
0.014703 0.019071 0.018489 0.010433 [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 2.82e-06 4.42e-06 5.21e-06 1.19e-05 1.59e-05 2.46e-05 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 1.36e+01 1.46e+01 1.11e+01 1.38e+01 4.44e+01 5.30e+01 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 2.16e-06 4.40e-06 5.68e-06 6.41e-06 1.53e-05 1.86e-05 erg/cm2
Error 1.13e-07 8.44e-08 9.49e-08 5.13e-07 2.21e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.03e+01 1.45e+01 1.22e+01 8.11e+00 4.17e+01 4.52e+01 ph/cm2/s
Error 6.57e-01 3.45e-01 2.66e-01 6.85e-01 9.37e-01 1.25e+00 ph/cm2/s
Fluence Band 2.14e-06 4.39e-06 5.66e-06 6.41e-06 1.53e-05 1.90e-05 erg/cm2
Error 1.12e-07 8.41e-08 9.46e-08 5.13e-07 2.21e-07 0.00e+00 erg/cm2
Peak flux Band 1.03e+01 1.45e+01 1.22e+01 8.11e+00 4.17e+01 4.52e+01 ph/cm2/s
Error 6.57e-01 2.89e-01 2.66e-01 6.85e-01 9.37e-01 1.70e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.764 0.000 - - 1.35e-01 0.00e+00 166.393 57
CPL 0.981 0.118 82.3 3.7 2.74e-01 2.85e-02 17.853 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.393 0.000 - - 3.65e-01 0.00e+00 140.768 57
CPL 0.584 0.144 109.0 9.0 7.75e-01 1.01e-01 32.992 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: 7.616000 sec.
T50 in the 50-300 keV band: 4.864000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.796 -0.120 12.676
T90 8.828 0.328 9.156
T50 5.220 1.372 6.592
Peak 1.000 0.544 1.544
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.1381 +26.3400 0.0014 26.0 19.1 26.3948 141.3 TRIG_00130088
------------------------------------------
Foreground time interval of the image:
0.136 12.932 (delta_t = 12.796 [sec])
Background time interval of the image:
-132.395 0.136 (delta_t = 132.531 [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 0.136 sec. to 12.932 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76399 ( )
Norm@50keV : 0.134901 ( )
------------------------------------------------------------
Chi-Squared = 166.3934 using 59 PHA bins.
Reduced chi-squared = 2.919182 for 57 degrees of freedom
Null hypothesis probability = 1.211E-12
Photon flux (15-150 keV) in 12.80 sec: 18.3359 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59206e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.136 sec. to 12.932 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.980904 ( -0.119315 0.116438 )
Epeak [keV] : 82.2772 ( -3.35657 4.12209 )
Norm@50keV : 0.273944 ( -2.671205E-02 3.027159E-02) )
------------------------------------------------------------
Chi-Squared = 17.85275 using 59 PHA bins.
Reduced chi-squared = 0.3187992 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 12.80 sec: 16.6628 ( -0.3841 0.3887 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53236e-05 ( -2.20685e-07 2.21862e-07 ) ergs/cm2
Band function
Time interval is from 0.136 sec. to 12.932 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.980974 ( -0.116304 0.119468 )
beta : -9.22245 ( -0.777548 6.87178 )
Epeak [keV] : 82.2639 ( -3.35969 4.10943 )
Norm@50keV : 0.273910 ( -2.668777E-02 3.031725E-02) )
------------------------------------------------------------
Chi-Squared = 17.85327 using 59 PHA bins.
Reduced chi-squared = 0.3246049 for 55 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 12.80 sec: 16.6631 ( -0.3844 0.3884 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5311e-05 ( -2.20403e-07 2.21299e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.800 sec. to 1.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39324 ( )
Norm@50keV : 0.365457 ( )
------------------------------------------------------------
Chi-Squared = 140.7682 using 59 PHA bins.
Reduced chi-squared = 2.469618 for 57 degrees of freedom
Null hypothesis probability = 4.883E-09
Photon flux (15-150 keV) in 1.000 sec: 44.4379 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5362e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.800 sec. to 1.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.583541 ( -0.146506 0.142206 )
Epeak [keV] : 109.008 ( -7.66737 10.3352 )
Norm@50keV : 0.774969 ( -9.341294E-02 0.109188 )
------------------------------------------------------------
Chi-Squared = 32.99228 using 59 PHA bins.
Reduced chi-squared = 0.5891477 for 56 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 1.000 sec: 41.7460 ( -0.9331 0.9409 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45143e-06 ( -5.9762e-08 5.9534e-08 ) ergs/cm2
Band function
Time interval is from 0.800 sec. to 1.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.583761 ( -0.141923 0.146815 )
beta : -9.08043 ( -0.919571 7.08385 )
Epeak [keV] : 109.007 ( -7.68764 10.3134 )
Norm@50keV : 0.774790 ( -9.322798E-02 0.109455 )
------------------------------------------------------------
Chi-Squared = 32.99279 using 59 PHA bins.
Reduced chi-squared = 0.5998689 for 55 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 1.000 sec: 41.7470 ( -0.9342 0.9403 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44934e-06 ( -5.973e-08 5.9447e-08 ) ergs/cm2
Plot creation:
Sun Jan 6 18:02:29 EST 2008