batgrbproduct Analysis for Trigger=131560
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 Jan 7 09:43:25 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131560/SDC
======================================================================
Trigger: 00131560 Segment: 000
BAT Trigger Time: 139472944.768 [s; MET]
Trigger Stop: 139472945.28 [s; MET]
UTC: 2005-06-03T06:29:05.214200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.9781544550354 Dec: -25.1827240278029 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 16
Flight Position: [ source = BAT ]
RA: 39.9781544550354 Dec: -25.1827240278029 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: Dec: [deg; J2000]
{ 00h 00m 00.0s , +00d 00' 00.0" }
+/- inf [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR:
RA = 0h 0m 0.0s (0.000000 deg.)
Dec = 0d 0' 0" (0.000000 deg.)
Angular difference between Flight and Ground position is 2765.733014 arcmin
Partial Coding Fraction: 0.04833984 [ including projection effects ]
Duration
T90: 21 +/- 7.81024967590665
Measured from: -9.76800000667572
to: 11.2319999933243 [s; relative to TRIGTIME]
T50: 3 +/- 1
Measured from: -1.76800000667572
to: 1.23199999332428 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.76800000667572
to: 0.23199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.7680000066757
to: 23.2319999933243 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.286960 3.963686 3.888202 1.469025
0.148106 0.164330 0.155806 0.123345 [error]
Peak 0.326848 0.816138 0.969316 0.348111
0.037870 0.052484 0.057843 0.044276 [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 7.89e-07 1.73e-06 2.99e-06 1.20e-05 8.19e-06 1.59e-05 erg/cm2
Error 7.43e-08 9.56e-08 1.46e-07 1.37e-06 3.75e-07 0.00e+00 erg/cm2
Peak flux Power-law 3.71e+00 5.40e+00 5.85e+00 1.19e+01 1.86e+01 2.68e+01 ph/cm2/s
Error 5.28e-01 4.75e-01 4.18e-01 1.80e+00 1.30e+00 2.06e+00 ph/cm2/s
Fluence Cutoff-PL 7.69e-07 1.74e-06 3.00e-06 1.19e-05 8.20e-06 1.29e-05 erg/cm2
Error 8.79e-08 9.60e-08 1.46e-07 1.36e-06 3.75e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.25e+00 5.58e+00 6.31e+00 7.58e+00 1.85e+01 2.27e+01 ph/cm2/s
Error 6.67e-01 5.29e-01 6.04e-01 3.33e+00 1.30e+00 2.43e+00 ph/cm2/s
Fluence Band 7.83e-07 1.73e-06 2.99e-06 1.19e-05 8.19e-06 1.11e-05 erg/cm2
Error 7.37e-08 9.86e-08 1.26e-07 2.37e-06 3.78e-07 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.212 0.080 - - 1.98e-02 8.78e-04 49.092 57
CPL 1.142 0.201 713.7 0.0 2.12e-02 8.80e-04 49.221 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.883 0.115 - - 1.62e-01 1.13e-02 65.504 57
CPL 0.876 0.116 9999.1 5000.0 1.63e-01 1.14e-02 65.415 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: 8.832000 sec.
T50 in the 50-300 keV band: 1.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 41.000 -17.768 23.232
T90 21.000 -9.768 11.232
T50 3.000 -1.768 1.232
Peak 1.000 -0.768 0.232
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
------------------------------------------
--> command terminated with status 0
Foreground time interval of the image:
-17.768 23.232 (delta_t = 41.000 [sec])
Background time interval of the image:
-299.768 -17.768 (delta_t = 282.000 [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 -17.768 sec. to 23.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21197 ( -8.077598E-02 7.993758E-02) )
Norm@50keV : 1.976645E-02 ( -8.798447E-04 8.770786E-04) )
------------------------------------------------------------
Chi-Squared = 49.09240 using 59 PHA bins.
Reduced chi-squared = 0.8612702 for 57 degrees of freedom
Null hypothesis probability = 0.763
Photon flux (15-150 keV) in 41.00 sec: 2.32416 ( -0.11151 0.11196 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.19479e-06 ( -3.7474e-07 3.74658e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.768 sec. to 23.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14210 ( -0.253768 0.147597 )
Epeak [keV] : 713.705 ( )
Norm@50keV : 2.123182E-02 ( -8.809827E-04 8.795913E-04) )
------------------------------------------------------------
Chi-Squared = 49.22061 using 59 PHA bins.
Reduced chi-squared = 0.8789395 for 56 degrees of freedom
Null hypothesis probability = 0.727
Photon flux (15-150 keV) in 41.00 sec: 2.32336 ( -0.11146 0.11191 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.19836e-06 ( -3.75314e-07 3.74535e-07 ) ergs/cm2
Band function
Time interval is from -17.768 sec. to 23.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.643754 ( -12.2377 1.24840 )
beta : -1.23228 ( -9.219635E-02 9.078717E-02) )
Epeak [keV] : 71.2435 ( -32.6059 96.8689 )
Norm@50keV : 4.770476E-02 ( -5.13321 623.339 )
------------------------------------------------------------
Chi-Squared = 48.25621 using 59 PHA bins.
Reduced chi-squared = 0.8773857 for 55 degrees of freedom
Null hypothesis probability = 0.728
Photon flux (15-150 keV) in 41.00 sec: 2.29876 ( -0.12735 0.11034 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.19135e-06 ( -3.81177e-07 3.74658e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.768 sec. to 0.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.883336 ( -0.115807 0.113421 )
Norm@50keV : 0.162190 ( -1.134300E-02 1.129335E-02) )
------------------------------------------------------------
Chi-Squared = 65.50423 using 59 PHA bins.
Reduced chi-squared = 1.149197 for 57 degrees of freedom
Null hypothesis probability = 0.206
Photon flux (15-150 keV) in 1.000 sec: 18.6142 ( -1.2986 1.2996 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83211e-06 ( -1.33731e-07 1.33934e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.768 sec. to 0.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.876322 ( -0.116751 0.114292 )
Epeak [keV] : 9999.14 ( -9999.13 0.859375 )
Norm@50keV : 0.163318 ( -1.139273E-02 1.134612E-02) )
------------------------------------------------------------
Chi-Squared = 65.41531 using 59 PHA bins.
Reduced chi-squared = 1.168131 for 56 degrees of freedom
Null hypothesis probability = 0.182
Photon flux (15-150 keV) in 1.000 sec: 18.5075 ( -1.302 1.3007 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82215e-06 ( -1.39012e-07 1.37481e-07 ) ergs/cm2
Band function
Time interval is from -0.768 sec. to 0.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.785008 ( -14.9995 4.553795E-04) )
beta : -0.883350 ( -0.133562 0.144696 )
Epeak [keV] : 33.4908 ( )
Norm@50keV : 0.238353 ( )
------------------------------------------------------------
Chi-Squared = 65.50423 using 59 PHA bins.
Reduced chi-squared = 1.190986 for 55 degrees of freedom
Null hypothesis probability = 0.157
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Jan 7 10:17:48 EST 2008