batgrbproduct Analysis for Trigger=148833
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): Tue Jan 8 15:01:57 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger148833/SDC
======================================================================
Trigger: 00148833 Segment: 000
BAT Trigger Time: 144789240 [s; MET]
Trigger Stop: 144789312 [s; MET]
UTC: 2005-08-03T19:14:00.344280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.649603158297 Dec: 5.80000785143894 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 350.649603158297 Dec: 5.80000785143894 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 350.64697495923 Dec: 5.78768027466097 [deg; J2000]
{ 23h 22m 35.3s , +05d 47' 15.6" }
+/- 1.16062922453245 [arcmin] (estimated 90% radius based on SNR)
+/- 0.357228227190941 [arcmin] (formal 1-sigma fit error)
SNR: 24.5866348666573
RA = 23h 22m 35.3s (350.646975 deg.)
Dec = 5d 47' 16" (5.787680 deg.)
Angular difference between Flight and Ground position is 0.756110 arcmin
Partial Coding Fraction: 0.3828125 [ including projection effects ]
Duration
T90: 86.4600000083447 +/- 10.4381272282503
Measured from: 63.66400000453
to: 150.124000012875 [s; relative to TRIGTIME]
T50: 37.1040000021458 +/- 7.59087162909776
Measured from: 71.8280000090599
to: 108.932000011206 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 147.108000010252
to: 148.108000010252 [s; relative to TRIGTIME]
Total Fluence
Measured from: 59.5839999914169
to: 165.124000012875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.897106 1.124569 1.000651 0.259828
0.062134 0.063440 0.055211 0.045621 [error]
Peak 0.028670 0.045531 0.035780 0.015853
0.004626 0.005018 0.004651 0.003726 [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 2.68e-07 5.18e-07 7.77e-07 2.52e-06 2.19e-06 4.08e-06 erg/cm2
Error 3.17e-08 3.55e-08 5.52e-08 4.11e-07 1.36e-07 4.40e-07 erg/cm2
Peak flux Power-law 3.07e-01 3.43e-01 2.74e-01 3.64e-01 1.06e+00 1.29e+00 ph/cm2/s
Error 6.95e-02 4.65e-02 3.83e-02 1.10e-01 1.28e-01 1.54e-01 ph/cm2/s
Fluence Cutoff-PL 2.62e-07 5.21e-07 7.81e-07 2.32e-06 2.18e-06 3.70e-06 erg/cm2
Error 3.76e-08 3.69e-08 6.20e-08 7.79e-07 1.33e-07 8.00e-07 erg/cm2
Peak flux Cutoff-PL 3.06e-01 3.43e-01 2.74e-01 3.62e-01 1.06e+00 1.29e+00 ph/cm2/s
Error 6.95e-02 4.65e-02 3.83e-02 1.09e-01 1.28e-01 1.54e-01 ph/cm2/s
Fluence Band 2.62e-07 5.19e-07 7.80e-07 2.33e-06 2.18e-06 3.77e-06 erg/cm2
Error 3.72e-08 3.79e-08 6.21e-08 7.79e-07 1.41e-07 8.08e-07 erg/cm2
Peak flux Band 3.05e-01 3.41e-01 2.77e-01 3.75e-01 1.05e+00 1.30e+00 ph/cm2/s
Error 5.31e-02 4.46e-02 3.58e-02 1.03e-01 1.26e-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 1.416 0.110 - - 2.15e-03 1.26e-04 61.059 57
CPL 1.288 0.304 310.7 0.0 2.46e-03 7.65e-04 61.117 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.322 0.213 - - 8.83e-03 1.03e-03 49.943 57
CPL 1.312 0.216 9925.0 5000.0 8.87e-03 3.31e-03 49.962 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: 84.480000 sec.
T50 in the 50-300 keV band: 19.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 105.540 59.584 165.124
T90 86.460 63.664 150.124
T50 37.104 71.828 108.932
Peak 1.000 147.108 148.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
350.6470 +5.7877 0.0078 34.7 39.6 1.9717 24.6 TRIG_00148833
------------------------------------------
Foreground time interval of the image:
59.584 85.205 (delta_t = 25.621 [sec])
Background time interval of the image:
-299.000 59.584 (delta_t = 358.584 [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 59.584 sec. to 165.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41643 ( -0.109978 0.109563 )
Norm@50keV : 2.152102E-03 ( -1.258356E-04 1.258354E-04) )
------------------------------------------------------------
Chi-Squared = 61.05930 using 59 PHA bins.
Reduced chi-squared = 1.071216 for 57 degrees of freedom
Null hypothesis probability = 0.332
Photon flux (15-150 keV) in 105.5 sec: 0.263080 ( -0.016782 0.016879 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18679e-06 ( -1.36158e-07 1.36211e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.584 sec. to 165.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28805 ( -0.371678 0.236569 )
Epeak [keV] : 310.675 ( )
Norm@50keV : 2.463775E-03 ( -1.215194E-04 1.409037E-03) )
------------------------------------------------------------
Chi-Squared = 61.11712 using 59 PHA bins.
Reduced chi-squared = 1.091377 for 56 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 105.5 sec: 0.262142 ( -0.008518 0.016947 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18091e-06 ( -1.28288e-07 1.36802e-07 ) ergs/cm2
Band function
Time interval is from 59.584 sec. to 165.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13351 ( -8.86649 3.44666 )
beta : -1.41481 ( -0.111316 0.108567 )
Epeak [keV] : 53.8383 ( -9877.00 1.48047 )
Norm@50keV : 3.834058E-03 ( -2.555442E-04 123.458 )
------------------------------------------------------------
Chi-Squared = 61.06918 using 59 PHA bins.
Reduced chi-squared = 1.110349 for 55 degrees of freedom
Null hypothesis probability = 0.267
Photon flux (15-150 keV) in 105.5 sec: 0.262144 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18017e-06 ( -1.42246e-07 1.4041e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 147.108 sec. to 148.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32241 ( -0.214249 0.211816 )
Norm@50keV : 8.831178E-03 ( -1.027970E-03 1.027376E-03) )
------------------------------------------------------------
Chi-Squared = 49.94267 using 59 PHA bins.
Reduced chi-squared = 0.8761871 for 57 degrees of freedom
Null hypothesis probability = 0.735
Photon flux (15-150 keV) in 1.000 sec: 1.05805 ( -0.127891 0.12832 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67849e-08 ( -1.11561e-08 1.12579e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 147.108 sec. to 148.108 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31162 ( -0.210879 0.220471 )
Epeak [keV] : 9925.02 ( -9925.01 74.9775 )
Norm@50keV : 8.869861E-03 ( -1.030424E-03 5.599545E-03) )
------------------------------------------------------------
Chi-Squared = 49.96205 using 59 PHA bins.
but latest trial 1.10038 gives Chi-Squared = 1.02229
Reduced chi-squared = 0.8921794 for 56 degrees of freedom
Null hypothesis probability = 0.702
Photon flux (15-150 keV) in 1.000 sec: 1.05774 ( -0.127859 0.12827 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.68187e-08 ( -1.11827e-08 1.1265e-08 ) ergs/cm2
Band function
Time interval is from 147.108 sec. to 148.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.952037 ( -10.9882 4.01185 )
beta : -1.32997 ( -0.229879 0.220467 )
Epeak [keV] : 68.7802 ( -25.7219 764.725 )
Norm@50keV : 1.682997E-02 ( -23.7033 1198.34 )
------------------------------------------------------------
Chi-Squared = 49.90762 using 59 PHA bins.
Reduced chi-squared = 0.9074113 for 55 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 1.000 sec: 1.05403 ( -0.124163 0.12765 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.70931e-08 ( -1.09103e-08 1.08351e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 15:15:06 EST 2008