batgrbproduct Analysis for Trigger=142851
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 Jan 7 11:36:23 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger142851/GCN5_download_cron
======================================================================
Trigger: 00142851 Segment: 000
BAT Trigger Time: 141449419.136 [s; MET]
Trigger Stop: 141449420.16 [s; MET]
UTC: 2005-06-26T03:30:19.545140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 337.088944061947 Dec: 54.1256712624889 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33355
Image Trigger?: NO
Rate S/N Ratio: 20.2731349327133 [ if not an image trigger ]
Image S/N Ratio: 33355
Flight Position: [ source = BAT ]
RA: 337.088944061947 Dec: 54.1256712624889 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 337.235349638385 Dec: 54.1568034021484 [deg; J2000]
{ 22h 28m 56.5s , +54d 09' 24.5" }
+/- 5.6664658445164 [arcmin] (estimated 90% radius based on SNR)
+/- 3.37351517848458 [arcmin] (formal 1-sigma fit error)
SNR: 2.55245436803487
RA = 22h 28m 56.5s (337.235350 deg.)
Dec = 54d 9' 24" (54.156803 deg.)
Angular difference between Flight and Ground position is 5.474310 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.005570 -0.002153 0.026277 0.016820
0.005690 0.006583 0.006881 0.007315 [error]
Peak -0.005570 -0.002153 0.026277 0.016820
0.005690 0.006583 0.006881 0.007315 [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 3.36e-10 1.86e-09 8.90e-09 1.79e-07 2.80e-08 1.73e-07 erg/cm2
Error 6.29e-10 2.15e-09 7.40e-09 2.70e-07 1.74e-08 2.52e-07 erg/cm2
Peak flux Power-law 1.03e-02 3.00e-02 7.17e-02 4.71e-01 1.94e-01 5.86e-01 ph/cm2/s
Error 1.94e-02 3.55e-02 6.02e-02 6.40e-01 1.63e-01 6.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.93e-10 2.35e-09 1.37e-08 2.94e-08 3.12e-08 1.04e-07 erg/cm2
Error 3.34e-10 2.51e-09 7.48e-09 1.12e-07 1.74e-08 2.11e-07 erg/cm2
Peak flux Cutoff-PL 1.03e-02 3.00e-02 7.19e-02 4.69e-01 1.94e-01 5.79e-01 ph/cm2/s
Error 1.94e-02 3.55e-02 6.02e-02 6.55e-01 1.63e-01 6.86e-01 ph/cm2/s
Fluence Band 4.90e-11 1.50e-09 1.50e-08 2.50e-08 3.19e-08 6.83e-09 erg/cm2
Error 7.57e-09 1.66e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.51e-03 2.37e-02 1.15e-01 1.17e-01 2.29e-01 2.68e-01 ph/cm2/s
Error 2.53e-02 4.79e-02 2.71e-01 8.77e-02 2.19e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.243 1.593 - - 1.31e-03 1.27e-03 69.735 57
CPL -0.265 1.314 9999.3 5000.0 1.32e-03 1.29e-03 69.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.243 1.593 - - 1.31e-03 1.27e-03 69.735 57
CPL -0.265 1.314 9999.3 5000.0 1.32e-03 1.29e-03 69.710 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
337.2353 +54.1568 0.0751 1.8 97.6 0.0340 2.6 TRIG_00142851
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.243345 ( -2.21669 0.970122 )
Norm@50keV : 1.308907E-03 ( -1.308907E-03 1.234885E-03) )
------------------------------------------------------------
Chi-Squared = 69.73534 using 59 PHA bins.
Reduced chi-squared = 1.223427 for 57 degrees of freedom
Null hypothesis probability = 0.120
Photon flux (15-150 keV) in 1.024 sec: 0.193927 ( -0.193927 0.131195 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79669e-08 ( -1.73743e-08 1.73727e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.264998 ( -1.64759 0.980810 )
Epeak [keV] : 9999.34 ( -9999.33 0.655273 )
Norm@50keV : 1.324870E-03 ( -1.324870E-03 1.245931E-03) )
------------------------------------------------------------
Chi-Squared = 69.70997 using 59 PHA bins.
Reduced chi-squared = 1.244821 for 56 degrees of freedom
Null hypothesis probability = 0.103
Photon flux (15-150 keV) in 1.024 sec: 0.194141 ( -0.194141 0.131211 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11635e-08 ( -1.70742e-08 1.77958e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.34143 ( -14.9995 4.720688E-04) )
beta : -9.31586 ( -0.637679 19.3622 )
Epeak [keV] : 118.988 ( -102.707 47.4036 )
Norm@50keV : 2.422362E-02 ( -6.368180E-02 0.174862 )
------------------------------------------------------------
Chi-Squared = 66.13382 using 59 PHA bins.
Reduced chi-squared = 1.202433 for 55 degrees of freedom
Null hypothesis probability = 0.145
Photon flux (15-150 keV) in 1.024 sec: 0.228618 ( -0.116108 0.059355 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18841e-08 ( -1.60132e-08 1.71618e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.243345 ( -2.21669 0.970122 )
Norm@50keV : 1.308907E-03 ( -1.308907E-03 1.234885E-03) )
------------------------------------------------------------
Chi-Squared = 69.73534 using 59 PHA bins.
Reduced chi-squared = 1.223427 for 57 degrees of freedom
Null hypothesis probability = 0.120
Photon flux (15-150 keV) in 1.024 sec: 0.193927 ( -0.193927 0.131195 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79669e-08 ( -1.73743e-08 1.73727e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.264998 ( -1.64759 0.980810 )
Epeak [keV] : 9999.34 ( -9999.33 0.655273 )
Norm@50keV : 1.324870E-03 ( -1.324870E-03 1.245931E-03) )
------------------------------------------------------------
Chi-Squared = 69.70997 using 59 PHA bins.
Reduced chi-squared = 1.244821 for 56 degrees of freedom
Null hypothesis probability = 0.103
Photon flux (15-150 keV) in 1.024 sec: 0.194141 ( -0.194141 0.131211 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11635e-08 ( -1.70742e-08 1.77958e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.34143 ( -14.9995 4.720688E-04) )
beta : -9.31586 ( -0.637679 19.3622 )
Epeak [keV] : 118.988 ( -102.707 47.4036 )
Norm@50keV : 2.422362E-02 ( -6.368180E-02 0.174862 )
------------------------------------------------------------
Chi-Squared = 66.13382 using 59 PHA bins.
Reduced chi-squared = 1.202433 for 55 degrees of freedom
Null hypothesis probability = 0.145
Photon flux (15-150 keV) in 1.024 sec: 0.228618 ( -0.116108 0.059355 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18841e-08 ( -1.60132e-08 1.71618e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 11:41:54 EST 2008