batgrbproduct Analysis for Trigger=118248
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): Sat Jan 5 02:05:12 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger118248/GCN5_download_cron
======================================================================
Trigger: 00118248 Segment: 000
BAT Trigger Time: 137198597.824 [s; MET]
Trigger Stop: 137198606.016 [s; MET]
UTC: 2005-05-07T22:43:18.311680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.0554888617114 Dec: -11.0734801541787 [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: 8.06225774829855 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 48.0554888617114 Dec: -11.0734801541787 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.0630579767906 Dec: -11.0506524600211 [deg; J2000]
{ 03h 12m 15.1s , -11d 03' 02.3" }
+/- 1.87554906702909 [arcmin] (estimated 90% radius based on SNR)
+/- 0.802668755248862 [arcmin] (formal 1-sigma fit error)
SNR: 12.3861092975121
RA = 3h 12m 15.1s (48.063058 deg.)
Dec = -11d 3' 2" (-11.050652 deg.)
Angular difference between Flight and Ground position is 1.440357 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 15 +/- 5.8309518948453
Measured from: -2.82400000095367
to: 12.1759999990463 [s; relative to TRIGTIME]
T50: 6 +/- 5
Measured from: 2.17599999904633
to: 8.17599999904633 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.17599999904633
to: 3.17599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.82400000095367
to: 13.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.130137 0.224429 0.148695 -0.002522
0.022716 0.023709 0.020524 0.016843 [error]
Peak 0.018243 0.015065 0.009469 0.005478
0.005416 0.005476 0.004915 0.003773 [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 4.82e-08 8.23e-08 1.07e-07 2.83e-07 3.15e-07 5.20e-07 erg/cm2
Error 9.44e-09 1.09e-08 1.92e-08 1.01e-07 4.69e-08 1.20e-07 erg/cm2
Peak flux Power-law 1.30e-01 1.30e-01 9.11e-02 1.01e-01 3.91e-01 4.52e-01 ph/cm2/s
Error 7.54e-02 4.68e-02 4.03e-02 9.60e-02 1.33e-01 1.54e-01 ph/cm2/s
Fluence Cutoff-PL 3.68e-08 1.01e-07 1.15e-07 3.87e-08 2.83e-07 2.91e-07 erg/cm2
Error 1.14e-08 1.53e-08 2.46e-08 4.95e-08 4.69e-08 6.12e-08 erg/cm2
Peak flux Cutoff-PL 1.30e-01 1.30e-01 9.11e-02 1.01e-01 3.91e-01 4.52e-01 ph/cm2/s
Error 7.54e-02 4.68e-02 4.03e-02 9.54e-02 1.33e-01 1.54e-01 ph/cm2/s
Fluence Band 3.58e-08 1.01e-07 1.14e-07 3.73e-08 2.82e-07 2.88e-07 erg/cm2
Error 8.79e-09 1.38e-08 1.84e-08 4.39e-08 2.58e-08 8.18e-08 erg/cm2
Peak flux Band 1.30e-01 1.30e-01 9.07e-02 9.97e-02 3.92e-01 4.51e-01 ph/cm2/s
Error 5.84e-02 4.46e-02 3.08e-02 1.04e-01 1.32e-01 1.51e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.618 0.208 - - 1.87e-03 2.61e-04 70.871 57
CPL -0.302 1.184 56.6 12.6 1.92e-02 4.68e-02 59.156 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.512 0.650 - - 3.12e-03 1.10e-03 68.120 57
CPL 1.414 3.056 283.8 0.0 3.53e-03 1.10e-03 68.197 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: 27.200000 sec.
T50 in the 50-300 keV band: 13.952000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 18.000 -4.824 13.176
T90 15.000 -2.824 12.176
T50 6.000 2.176 8.176
Peak 1.000 2.176 3.176
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.0631 -11.0507 0.0155 25.9 -60.8 0.5336 12.4 TRIG_00118248
------------------------------------------
Foreground time interval of the image:
-4.824 13.176 (delta_t = 18.000 [sec])
Background time interval of the image:
-299.824 -4.824 (delta_t = 295.000 [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 -4.824 sec. to 13.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61837 ( -0.205699 0.211217 )
Norm@50keV : 1.873988E-03 ( -2.623807E-04 2.599980E-04) )
------------------------------------------------------------
Chi-Squared = 70.87051 using 59 PHA bins.
Reduced chi-squared = 1.243342 for 57 degrees of freedom
Null hypothesis probability = 0.102
Photon flux (15-150 keV) in 18.00 sec: 0.242210 ( -0.031946 0.031976 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14782e-07 ( -4.64922e-08 4.72518e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.824 sec. to 13.176 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.302178 ( -1.34793 1.01935 )
Epeak [keV] : 56.6460 ( -8.94361 16.2762 )
Norm@50keV : 1.919045E-02 ( -1.919045E-02 7.447720E-02) )
------------------------------------------------------------
Chi-Squared = 59.15612 using 59 PHA bins.
but latest trial 0.717171 gives Chi-Squared = 2.56109
Reduced chi-squared = 1.056359 for 56 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 18.00 sec: 0.229987 ( -0.032543 0.032602 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8337e-07 ( -4.54968e-08 4.83912e-08 ) ergs/cm2
Band function
Time interval is from -4.824 sec. to 13.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.291239 ( -1.03406 1.32721 )
beta : -9.35052 ( -0.649484 19.3504 )
Epeak [keV] : 56.5999 ( -8.63183 16.3128 )
Norm@50keV : 1.900881E-02 ( -1.900881E-02 7.332858E-02) )
------------------------------------------------------------
Chi-Squared = 59.15703 using 59 PHA bins.
Reduced chi-squared = 1.075582 for 55 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 18.00 sec: 0.229527 ( -0.016679 0.01668 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82179e-07 ( -2.5803e-08 2.58048e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.176 sec. to 3.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51204 ( -0.631045 0.668854 )
Norm@50keV : 3.122396E-03 ( -1.122310E-03 1.069171E-03) )
------------------------------------------------------------
Chi-Squared = 68.12042 using 59 PHA bins.
Reduced chi-squared = 1.195095 for 57 degrees of freedom
Null hypothesis probability = 0.149
Photon flux (15-150 keV) in 1.000 sec: 0.391078 ( -0.132892 0.133124 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9568e-08 ( -1.11654e-08 1.13849e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.176 sec. to 3.176 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41392 ( -4.41392 1.69875 )
Epeak [keV] : 283.761 ( )
Norm@50keV : 3.528718E-03 ( -1.132249E-03 1.071561E-03) )
------------------------------------------------------------
Chi-Squared = 68.19666 using 59 PHA bins.
but latest trial 3.11311 gives Chi-Squared = 0.111099
Reduced chi-squared = 1.217798 for 56 degrees of freedom
Null hypothesis probability = 0.127
Photon flux (15-150 keV) in 1.000 sec: 0.390961 ( -0.132853 0.13309 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.956e-08 ( -1.11551e-08 1.14025e-08 ) ergs/cm2
Band function
Time interval is from 2.176 sec. to 3.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.977557 ( -1.21035 13.7896 )
beta : -1.66830 ( -0.667431 0.631603 )
Epeak [keV] : 85.8898 ( -85.7898 9914.11 )
Norm@50keV : 6.041515E-03 ( -0.152495 0.145374 )
------------------------------------------------------------
Chi-Squared = 68.19151 using 59 PHA bins.
Reduced chi-squared = 1.239846 for 55 degrees of freedom
Null hypothesis probability = 0.109
Photon flux (15-150 keV) in 1.000 sec: 0.391968 ( -0.130888 0.133234 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9364e-08 ( -9.767e-09 1.10065e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 02:12:44 EST 2008