batgrbproduct Analysis for Trigger=259714
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 Dec 13 12:40:51 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger259714/GCN5_download_cron
======================================================================
Trigger: 00259714 Segment: 000
BAT Trigger Time: 192618636.032 [s; MET]
Trigger Stop: 192618637.44 [s; MET]
UTC: 2007-02-08T09:10:34.281260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 197.920440046571 Dec: 61.9586566987151 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.29
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.29
Flight Position: [ source = BAT ]
RA: 197.920440046571 Dec: 61.9586566987151 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 197.900349509426 Dec: 61.9171425219032 [deg; J2000]
{ 13h 11m 36.1s , +61d 55' 01.7" }
+/- 3.35251420146265 [arcmin] (estimated 90% radius based on SNR)
+/- 2.18454273365793 [arcmin] (formal 1-sigma fit error)
SNR: 5.40242708377264
RA = 13h 11m 36.1s (197.900350 deg.)
Dec = 61d 55' 2" (61.917143 deg.)
Angular difference between Flight and Ground position is 2.554585 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 64 +/- 22.6274169979695
Measured from: -15.0320000052452
to: 48.9679999947548 [s; relative to TRIGTIME]
T50: 48 +/- 16
Measured from: -15.0320000052452
to: 32.9679999947548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.4679999947548
to: 41.4679999947548 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.0320000052452
to: 48.9679999947548 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.317793 0.319067 0.240134 0.028239
0.057580 0.058233 0.051149 0.044785 [error]
Peak 0.129287 0.196171 0.146592 -0.010865
0.027769 0.028356 0.025020 0.021348 [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 1.14e-07 1.54e-07 1.53e-07 2.76e-07 5.10e-07 7.00e-07 erg/cm2
Error 3.13e-08 2.93e-08 5.06e-08 1.84e-07 1.16e-07 2.38e-07 erg/cm2
Peak flux Power-law 1.06e-01 9.31e-02 5.61e-02 5.10e-02 2.77e-01 3.06e-01 ph/cm2/s
Error 2.80e-02 1.60e-02 1.30e-02 2.31e-02 4.73e-02 5.16e-02 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 Cutoff-PL 9.05e-02 1.02e-01 6.07e-02 2.17e-02 2.68e-01 2.75e-01 ph/cm2/s
Error 3.33e-02 1.98e-02 1.54e-02 2.79e-02 4.82e-02 5.52e-02 ph/cm2/s
Fluence Band 1.07e-07 1.61e-07 1.56e-07 1.59e-07 5.00e-07 5.77e-07 erg/cm2
Error 3.57e-08 3.69e-08 5.46e-08 2.40e-07 1.19e-07 2.74e-07 erg/cm2
Peak flux Band 9.05e-02 1.02e-01 6.07e-02 2.18e-02 2.68e-01 2.75e-01 ph/cm2/s
Error 3.33e-02 1.98e-02 1.54e-02 2.79e-02 4.85e-02 5.52e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.005 0.373 - - 8.65e-04 2.08e-04 55.701 57
CPL 1.384 0.000 47.3 0.0 1.82e-03 0.00e+00 55.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.731 0.289 - - 2.06e-03 3.75e-04 54.078 57
CPL 0.802 1.234 63.8 4976.6 6.18e-03 1.54e-02 51.998 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: 8.000000 sec.
T50 in the 50-300 keV band: 5.376000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 -15.032 48.968
T90 64.000 -15.032 48.968
T50 48.000 -15.032 32.968
Peak 1.000 40.468 41.468
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
197.9003 +61.9171 0.0356 39.4 -27.3 0.5113 5.4 TRIG_00259714
------------------------------------------
Foreground time interval of the image:
-15.032 26.069 (delta_t = 41.101 [sec])
Background time interval of the image:
-239.032 -15.032 (delta_t = 224.000 [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 -15.032 sec. to 48.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00508 ( -0.349957 0.396775 )
Norm@50keV : 8.645622E-04 ( -2.136885E-04 2.020542E-04) )
------------------------------------------------------------
Chi-Squared = 55.70121 using 59 PHA bins.
Reduced chi-squared = 0.9772142 for 57 degrees of freedom
Null hypothesis probability = 0.524
Photon flux (15-150 keV) in 64.00 sec: 0.129988 ( -0.024804 0.024829 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10352e-07 ( -1.14298e-07 1.17549e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.032 sec. to 48.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38426 ( )
Epeak [keV] : 47.3159 ( )
Norm@50keV : 1.818483E-03 ( )
------------------------------------------------------------
Chi-Squared = 55.52984 using 59 PHA bins.
Reduced chi-squared = 0.9916043 for 56 degrees of freedom
Null hypothesis probability = 0.493
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -15.032 sec. to 48.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48100 ( -8.51900 1.39063 )
beta : -9.19786 ( -0.802137 7.52798 )
Epeak [keV] : 47.2069 ( -30.8215 9952.79 )
Norm@50keV : 1.637833E-03 ( -1.637833E-03 7.237103E-03) )
------------------------------------------------------------
Chi-Squared = 55.46457 using 59 PHA bins.
Reduced chi-squared = 1.008447 for 55 degrees of freedom
Null hypothesis probability = 0.457
Photon flux (15-150 keV) in 64.00 sec: 0.128321 ( -0.025447 0.025375 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.99884e-07 ( -1.17119e-07 1.21718e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 32.968 sec. to 48.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73127 ( -0.281386 0.296976 )
Norm@50keV : 2.063206E-03 ( -3.792032E-04 3.716273E-04) )
------------------------------------------------------------
Chi-Squared = 54.07840 using 59 PHA bins.
Reduced chi-squared = 0.9487439 for 57 degrees of freedom
Null hypothesis probability = 0.585
Photon flux (15-150 keV) in 16.00 sec: 0.277083 ( -0.047213 0.04731 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05021e-07 ( -5.73296e-08 5.81296e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.968 sec. to 48.968 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.802107 ( -1.40077 1.06689 )
Epeak [keV] : 63.7574 ( -16.9158 9936.24 )
Norm@50keV : 6.178237E-03 ( -6.178237E-03 2.460784E-02) )
------------------------------------------------------------
Chi-Squared = 51.99816 using 59 PHA bins.
but latest trial 35.2758 gives Chi-Squared = 4.30772
Reduced chi-squared = 0.9285386 for 56 degrees of freedom
Null hypothesis probability = 0.627
Photon flux (15-150 keV) in 16.00 sec: 0.268385 ( -0.048012 0.048448 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91878e-07 ( -5.856e-08 6.03936e-08 ) ergs/cm2
Band function
Time interval is from 32.968 sec. to 48.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.879532 ( -9.12047 1.42749 )
beta : -9.13993 ( -0.860065 7.54429 )
Epeak [keV] : 65.0927 ( -20.9684 9934.91 )
Norm@50keV : 5.660976E-03 ( -5.660976E-03 2.512288E-02) )
------------------------------------------------------------
Chi-Squared = 52.01051 using 59 PHA bins.
Reduced chi-squared = 0.9456456 for 55 degrees of freedom
Null hypothesis probability = 0.590
Photon flux (15-150 keV) in 16.00 sec: 0.268430 ( -0.048519 0.048447 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91744e-07 ( -5.87344e-08 6.02448e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 12:59:37 EST 2007