batgrbproduct Analysis for Trigger=263361
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 15:16:57 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger263361/GCN5_download_hand
======================================================================
Trigger: 00263361 Segment: 000
BAT Trigger Time: 194892089.984 [s; MET]
Trigger Stop: 194892102.144 [s; MET]
UTC: 2007-03-06T16:41:28.177300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.081830318346 Dec: 10.4713881166989 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.85
Image Trigger?: NO
Rate S/N Ratio: 13.3041346956501 [ if not an image trigger ]
Image S/N Ratio: 9.85
Flight Position: [ source = BAT ]
RA: 148.081830318346 Dec: 10.4713881166989 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 148.144492851104 Dec: 10.4385663297061 [deg; J2000]
{ 09h 52m 34.7s , +10d 26' 18.8" }
+/- 2.9755672553653 [arcmin] (estimated 90% radius based on SNR)
+/- 1.54194163424852 [arcmin] (formal 1-sigma fit error)
SNR: 6.40604722435571
RA = 9h 52m 34.7s (148.144493 deg.)
Dec = 10d 26' 19" (10.438566 deg.)
Angular difference between Flight and Ground position is 4.189085 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 209.439999967813 +/- 64.7675716279367
Measured from: -61.727999985218
to: 147.711999982595 [s; relative to TRIGTIME]
T50: 21.7439999580383 +/- 41.4046366458707
Measured from: 84.0960000157356
to: 105.839999973774 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 98.2759999930859
to: 99.2759999930859 [s; relative to TRIGTIME]
Total Fluence
Measured from: -118.831999987364
to: 186.495999991894 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.901540 3.457589 2.163898 0.494645
0.135377 0.136858 0.120022 0.102714 [error]
Peak 0.143834 0.186965 0.137654 0.020409
0.007262 0.007998 0.007058 0.004936 [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 9.28e-07 1.49e-06 1.81e-06 4.31e-06 5.46e-06 8.53e-06 erg/cm2
Error 8.37e-08 7.69e-08 1.23e-07 6.50e-07 2.85e-07 7.31e-07 erg/cm2
Peak flux Power-law 1.55e+00 1.42e+00 9.07e-01 8.87e-01 4.25e+00 4.77e+00 ph/cm2/s
Error 1.40e-01 7.77e-02 5.85e-02 1.19e-01 2.26e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 9.28e-07 1.49e-06 1.81e-06 4.27e-06 5.46e-06 8.51e-06 erg/cm2
Error 8.37e-08 7.69e-08 1.23e-07 6.44e-07 2.85e-07 7.25e-07 erg/cm2
Peak flux Cutoff-PL 1.41e+00 1.47e+00 9.45e-01 5.79e-01 4.15e+00 4.41e+00 ph/cm2/s
Error 1.78e-01 8.91e-02 6.86e-02 2.19e-01 2.40e-01 3.37e-01 ph/cm2/s
Fluence Band 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 Band 1.41e+00 1.47e+00 9.42e-01 6.53e-01 4.14e+00 4.47e+00 ph/cm2/s
Error 1.81e-01 9.03e-02 6.99e-02 2.81e-01 2.38e-01 3.47e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.721 0.095 - - 1.93e-03 9.68e-05 60.940 57
CPL 1.668 0.000 306.0 4997.7 2.04e-03 6.09e-04 61.536 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.651 0.091 - - 3.25e-02 1.67e-03 40.103 57
CPL 1.221 0.391 94.6 125.3 5.26e-02 2.37e-02 36.196 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: 136.448000 sec.
T50 in the 50-300 keV band: 16.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 305.328 -118.832 186.496
T90 209.440 -61.728 147.712
T50 21.744 84.096 105.840
Peak 1.000 98.276 99.276
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
148.1445 +10.4386 0.0297 33.0 106.2 2.1864 6.4 TRIG_00263361
------------------------------------------
Foreground time interval of the image:
-118.832 56.917 (delta_t = 175.749 [sec])
Background time interval of the image:
-239.984 -230.784 (delta_t = 9.200 [sec])
-229.984 -219.844 (delta_t = 10.140 [sec])
-218.984 -200.434 (delta_t = 18.550 [sec])
-198.984 -118.832 (delta_t = 80.152 [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 -118.832 sec. to 186.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72080 ( -9.509945E-02 9.581554E-02) )
Norm@50keV : 1.934741E-03 ( -9.718095E-05 9.651703E-05) )
------------------------------------------------------------
Chi-Squared = 60.93986 using 59 PHA bins.
Reduced chi-squared = 1.069120 for 57 degrees of freedom
Null hypothesis probability = 0.336
Photon flux (15-150 keV) in 305.3 sec: 0.258850 ( -0.013526 0.013602 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46044e-06 ( -2.84051e-07 2.86219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -118.832 sec. to 186.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66797 ( )
Epeak [keV] : 305.989 ( -0.146533 9995.32 )
Norm@50keV : 2.039062E-03 ( -1.399582E-04 1.077687E-03) )
------------------------------------------------------------
Chi-Squared = 61.53578 using 59 PHA bins.
Reduced chi-squared = 1.098853 for 56 degrees of freedom
Null hypothesis probability = 0.285
Photon flux (15-150 keV) in 305.3 sec: 0.258728 ( -0.01352 0.013595 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46108e-06 ( -2.84936e-07 2.85578e-07 ) ergs/cm2
Band function
Time interval is from -118.832 sec. to 186.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07458 ( -9.04542 2.37715 )
beta : -1.72509 ( -0.125015 9.850192E-02) )
Epeak [keV] : 29.2430 ( -29.1621 1107.48 )
Norm@50keV : 6.604165E-03 ( -8.008870E-03 492.870 )
------------------------------------------------------------
Chi-Squared = 60.87352 using 59 PHA bins.
Reduced chi-squared = 1.106791 for 55 degrees of freedom
Null hypothesis probability = 0.273
Photon flux (15-150 keV) in 305.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 98.272 sec. to 99.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65136 ( -9.068668E-02 9.165955E-02) )
Norm@50keV : 3.252176E-02 ( -1.671089E-03 1.663577E-03) )
------------------------------------------------------------
Chi-Squared = 40.10323 using 59 PHA bins.
Reduced chi-squared = 0.7035654 for 57 degrees of freedom
Null hypothesis probability = 0.956
Photon flux (15-150 keV) in 1.008 sec: 4.24844 ( -0.22527 0.22586 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0486e-07 ( -1.64536e-08 1.64848e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 98.272 sec. to 99.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22090 ( -0.408963 0.372885 )
Epeak [keV] : 94.5704 ( -23.5633 226.952 )
Norm@50keV : 5.264117E-02 ( -1.761662E-02 2.975418E-02) )
------------------------------------------------------------
Chi-Squared = 36.19627 using 59 PHA bins.
Reduced chi-squared = 0.6463620 for 56 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 1.008 sec: 4.14883 ( -0.24012 0.24054 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97707e-07 ( -1.80089e-08 1.77136e-08 ) ergs/cm2
Band function
Time interval is from 98.272 sec. to 99.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18645 ( -0.216130 0.458087 )
beta : -2.14896 ( -7.85104 0.460054 )
Epeak [keV] : 90.0986 ( -34.4910 214.652 )
Norm@50keV : 5.493743E-02 ( -1.970134E-02 3.499398E-02) )
------------------------------------------------------------
Chi-Squared = 36.11323 using 59 PHA bins.
Reduced chi-squared = 0.6566042 for 55 degrees of freedom
Null hypothesis probability = 0.977
Photon flux (15-150 keV) in 1.008 sec: 4.14421 ( -0.23351 0.24163 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97391e-07 ( -1.79656e-08 1.77368e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 15:32:46 EST 2007