batgrbproduct Analysis for Trigger=287364
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 17 18:48:23 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger287364/SDC
======================================================================
Trigger: 00287364 Segment: 000
BAT Trigger Time: 208404714.56 [s; MET]
Trigger Stop: 208404715.584 [s; MET]
UTC: 2007-08-10T02:11:52.414980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.939176238456 Dec: 10.7444551264059 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.68
Image Trigger?: NO
Rate S/N Ratio: 20.7846096908265 [ if not an image trigger ]
Image S/N Ratio: 12.68
Flight Position: [ source = BAT ]
RA: 189.939176238456 Dec: 10.7444551264059 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.946848503976 Dec: 10.7468678570967 [deg; J2000]
{ 12h 39m 47.2s , +10d 44' 48.7" }
+/- 1.31237592405665 [arcmin] (estimated 90% radius based on SNR)
+/- 0.478894128494004 [arcmin] (formal 1-sigma fit error)
SNR: 20.6283138643885
RA = 12h 39m 47.2s (189.946849 deg.)
Dec = 10d 44' 49" (10.746868 deg.)
Angular difference between Flight and Ground position is 0.474867 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 11.0320000052452 +/- 4.9906412396737
Measured from: -1.61199998855591
to: 9.4200000166893 [s; relative to TRIGTIME]
T50: 3.75999999046326 +/- 0.564793771652564
Measured from: 0.236000001430511
to: 3.99599999189377 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.111999988555908
to: 0.888000011444092 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.07199999690056
to: 14.2639999985695 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.447303 0.479257 0.226266 0.026893
0.029062 0.029539 0.025545 0.022214 [error]
Peak 0.061927 0.087233 0.045708 0.011974
0.007601 0.007972 0.006765 0.005468 [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 1.59e-07 2.10e-07 2.03e-07 3.51e-07 6.87e-07 9.25e-07 erg/cm2
Error 1.79e-08 1.56e-08 2.54e-08 8.82e-08 5.83e-08 1.14e-07 erg/cm2
Peak flux Power-law 7.94e-01 6.36e-01 3.43e-01 2.70e-01 1.89e+00 2.04e+00 ph/cm2/s
Error 1.32e-01 7.03e-02 5.65e-02 8.57e-02 2.11e-01 2.25e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-07 2.25e-07 2.00e-07 1.29e-07 6.50e-07 7.08e-07 erg/cm2
Error 2.10e-08 2.16e-08 2.88e-08 1.20e-07 6.74e-08 1.53e-07 erg/cm2
Peak flux Cutoff-PL 7.26e-01 6.90e-01 3.54e-01 1.21e-01 1.85e+00 1.89e+00 ph/cm2/s
Error 1.53e-01 9.44e-02 6.41e-02 1.28e-01 2.17e-01 2.47e-01 ph/cm2/s
Fluence Band 1.45e-07 2.26e-07 1.96e-07 1.96e-07 6.51e-07 7.74e-07 erg/cm2
Error 2.10e-08 2.19e-08 2.99e-08 1.52e-07 7.61e-08 1.71e-07 erg/cm2
Peak flux Band 7.26e-01 6.90e-01 3.54e-01 1.21e-01 1.85e+00 1.89e+00 ph/cm2/s
Error 1.53e-01 9.45e-02 6.41e-02 1.28e-01 2.17e-01 2.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.047 0.144 - - 4.29e-03 3.87e-04 47.449 57
CPL 1.386 0.678 40.4 28.2 1.00e-02 1.05e-02 44.116 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.890 0.195 - - 1.33e-02 1.68e-03 52.151 57
CPL 1.170 0.884 52.4 4982.2 3.29e-02 5.64e-02 49.811 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: 4.672000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.336 -3.072 14.264
T90 11.032 -1.612 9.420
T50 3.760 0.236 3.996
Peak 1.000 -0.112 0.888
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.9468 +10.7469 0.0093 35.6 -40.0 1.2210 20.6 TRIG_00287364
------------------------------------------
Foreground time interval of the image:
-3.072 14.264 (delta_t = 17.336 [sec])
Background time interval of the image:
-239.560 -3.072 (delta_t = 236.488 [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 -3.072 sec. to 14.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04653 ( -0.141068 0.146272 )
Norm@50keV : 4.286033E-03 ( -3.902738E-04 3.839610E-04) )
------------------------------------------------------------
Chi-Squared = 47.44857 using 59 PHA bins.
Reduced chi-squared = 0.8324311 for 57 degrees of freedom
Null hypothesis probability = 0.812
Photon flux (15-150 keV) in 17.34 sec: 0.657052 ( -0.050084 0.050163 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87347e-07 ( -5.79121e-08 5.85901e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.072 sec. to 14.264 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38621 ( -0.732540 0.624044 )
Epeak [keV] : 40.4353 ( -40.4253 15.9794 )
Norm@50keV : 1.001071E-02 ( -5.406981E-03 1.557551E-02) )
------------------------------------------------------------
Chi-Squared = 44.11602 using 59 PHA bins.
but latest trial 2.00491 gives Chi-Squared = 3.58417
Reduced chi-squared = 0.7877861 for 56 degrees of freedom
Null hypothesis probability = 0.875
Photon flux (15-150 keV) in 17.34 sec: 0.637426 ( -0.053524 0.053281 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49529e-07 ( -6.67451e-08 6.80127e-08 ) ergs/cm2
Band function
Time interval is from -3.072 sec. to 14.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32550 ( -0.622167 1.24098 )
beta : -2.63543 ( -7.36457 0.571551 )
Epeak [keV] : 39.6533 ( -14.6156 14.8596 )
Norm@50keV : 1.095209E-02 ( -1.095209E-02 0.127710 )
------------------------------------------------------------
Chi-Squared = 43.83736 using 59 PHA bins.
Reduced chi-squared = 0.7970428 for 55 degrees of freedom
Null hypothesis probability = 0.860
Photon flux (15-150 keV) in 17.34 sec: 0.636566 ( -0.05333 0.053234 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50947e-07 ( -8.55001e-08 6.67677e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88973 ( -0.190592 0.200011 )
Norm@50keV : 1.326023E-02 ( -1.697627E-03 1.663051E-03) )
------------------------------------------------------------
Chi-Squared = 52.15102 using 59 PHA bins.
Reduced chi-squared = 0.9149302 for 57 degrees of freedom
Null hypothesis probability = 0.657
Photon flux (15-150 keV) in 1.000 sec: 1.89474 ( -0.21138 0.21158 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21863e-07 ( -1.5237e-08 1.5507e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17037 ( -0.976956 0.790642 )
Epeak [keV] : 52.3618 ( -16.8055 9947.64 )
Norm@50keV : 3.288407E-02 ( -3.288407E-02 7.986939E-02) )
------------------------------------------------------------
Chi-Squared = 49.81104 using 59 PHA bins.
Reduced chi-squared = 0.8894828 for 56 degrees of freedom
Null hypothesis probability = 0.707
Photon flux (15-150 keV) in 1.000 sec: 1.85333 ( -0.21714 0.21657 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16228e-07 ( -1.65258e-08 1.6793e-08 ) ergs/cm2
Band function
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17061 ( -8.82939 0.882173 )
beta : -6.47942 ( -3.52058 4.66695 )
Epeak [keV] : 52.3522 ( -14.4744 559.385 )
Norm@50keV : 3.287200E-02 ( -7.791568E-03 5.328007E-02) )
------------------------------------------------------------
Chi-Squared = 49.81098 using 59 PHA bins.
Reduced chi-squared = 0.9056541 for 55 degrees of freedom
Null hypothesis probability = 0.673
Photon flux (15-150 keV) in 1.000 sec: 1.85340 ( -0.21718 0.21677 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Dec 17 19:09:41 EST 2007