batgrbproduct Analysis for Trigger=107547
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): Fri Jan 4 21:27:25 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger107547/GCN_download_cron
======================================================================
Trigger: 00107547 Segment: 000
BAT Trigger Time: 131772791.296 [s; MET]
Trigger Stop: 131772803.456 [s; MET]
UTC: 2005-03-06T03:33:11.876760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.322462112659 Dec: -9.16491762927298 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: NO
Rate S/N Ratio: 15.7480157480236 [ if not an image trigger ]
Image S/N Ratio: 11
Flight Position: [ source = BAT ]
RA: 282.322462112659 Dec: -9.16491762927298 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.312472197529 Dec: -9.15110495383631 [deg; J2000]
{ 18h 49m 15.0s , -09d 09' 04.0" }
+/- 1.0006848101021 [arcmin] (estimated 90% radius based on SNR)
+/- 0.363464082187917 [arcmin] (formal 1-sigma fit error)
SNR: 30.3874078633165
RA = 18h 49m 15.0s (282.312472 deg.)
Dec = -9d 9' 4" (-9.151105 deg.)
Angular difference between Flight and Ground position is 1.018341 arcmin
Partial Coding Fraction: 0.1582031 [ including projection effects ]
Duration
T90: 158.408000007272 +/- 19.8960354816785
Measured from: 4.94399999082088
to: 163.351999998093 [s; relative to TRIGTIME]
T50: 74.7800000011921 +/- 5.35157098441799
Measured from: 31.6560000032187
to: 106.436000004411 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 107.851999998093
to: 108.851999998093 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.42000000178814
to: 187.843999996781 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.672814 5.549570 5.264820 1.398239
0.193900 0.197830 0.170444 0.134677 [error]
Peak 0.076869 0.130586 0.154386 0.033820
0.015919 0.016811 0.016387 0.012114 [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 1.51e-06 2.82e-06 4.04e-06 1.23e-05 1.15e-05 2.06e-05 erg/cm2
Error 1.20e-07 1.33e-07 1.68e-07 1.17e-06 4.34e-07 1.24e-06 erg/cm2
Peak flux Power-law 1.03e+00 1.16e+00 9.29e-01 1.24e+00 3.58e+00 4.36e+00 ph/cm2/s
Error 2.52e-01 1.76e-01 1.24e-01 3.40e-01 4.83e-01 5.39e-01 ph/cm2/s
Fluence Cutoff-PL 1.38e-06 2.86e-06 4.22e-06 8.64e-06 1.14e-05 1.69e-05 erg/cm2
Error 1.60e-07 1.41e-07 2.18e-07 2.56e-06 4.59e-07 2.57e-06 erg/cm2
Peak flux Cutoff-PL 8.28e-01 1.21e+00 1.04e+00 6.72e-01 3.47e+00 3.75e+00 ph/cm2/s
Error 3.19e-01 1.99e-01 1.74e-01 4.93e-01 4.97e-01 5.11e-01 ph/cm2/s
Fluence Band 1.36e-06 2.85e-06 4.20e-06 8.62e-06 1.14e-05 1.72e-05 erg/cm2
Error 1.59e-07 1.41e-07 2.18e-07 2.56e-06 4.48e-07 2.56e-06 erg/cm2
Peak flux Band 8.28e-01 1.21e+00 1.04e+00 6.74e-01 3.47e+00 3.75e+00 ph/cm2/s
Error 3.19e-01 1.99e-01 1.74e-01 3.29e-01 4.97e-01 7.10e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.478 0.068 - - 6.32e-03 2.40e-04 59.926 57
CPL 1.145 0.288 153.8 224.4 8.76e-03 2.47e-03 55.733 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.318 0.205 - - 2.99e-02 3.72e-03 57.259 57
CPL 0.494 1.000 107.1 4962.6 6.89e-02 8.63e-02 54.773 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: 124.288000 sec.
T50 in the 50-300 keV band: 76.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 191.264 -3.420 187.844
T90 158.408 4.944 163.352
T50 74.780 31.656 106.436
Peak 1.000 107.852 108.852
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.3125 -9.1511 0.0063 50.7 -31.0 16.2298 30.4 TRIG_00107547
------------------------------------------
Foreground time interval of the image:
-3.420 187.844 (delta_t = 191.264 [sec])
Background time interval of the image:
-299.296 -3.420 (delta_t = 295.876 [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 -3.420 sec. to 187.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47794 ( -6.812799E-02 6.777167E-02) )
Norm@50keV : 6.318299E-03 ( -2.401462E-04 2.397886E-04) )
------------------------------------------------------------
Chi-Squared = 59.92579 using 59 PHA bins.
Reduced chi-squared = 1.051330 for 57 degrees of freedom
Null hypothesis probability = 0.370
Photon flux (15-150 keV) in 191.3 sec: 0.784186 ( -0.034859 0.035062 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15097e-05 ( -4.35074e-07 4.33448e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.420 sec. to 187.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14523 ( -0.299259 0.277489 )
Epeak [keV] : 153.809 ( -45.5961 403.131 )
Norm@50keV : 8.763472E-03 ( -2.056750E-03 2.889316E-03) )
------------------------------------------------------------
Chi-Squared = 55.73306 using 59 PHA bins.
Reduced chi-squared = 0.9952332 for 56 degrees of freedom
Null hypothesis probability = 0.485
Photon flux (15-150 keV) in 191.3 sec: 0.765918 ( -0.03755 0.037719 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13976e-05 ( -4.48962e-07 4.68857e-07 ) ergs/cm2
Band function
Time interval is from -3.420 sec. to 187.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21758 ( -0.232729 0.403169 )
beta : -8.97523 ( -7.724762E-05 1.02409 )
Epeak [keV] : 194.995 ( -45.4923 403.530 )
Norm@50keV : 8.038148E-03 ( -2.058336E-03 2.884799E-03) )
------------------------------------------------------------
Chi-Squared = 56.30461 using 59 PHA bins.
Reduced chi-squared = 1.023720 for 55 degrees of freedom
Null hypothesis probability = 0.426
Photon flux (15-150 keV) in 191.3 sec: 0.765945 ( -0.037594 0.037854 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13877e-05 ( -4.48905e-07 4.47011e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 107.852 sec. to 108.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31784 ( -0.206969 0.203574 )
Norm@50keV : 2.986863E-02 ( -3.722647E-03 3.714994E-03) )
------------------------------------------------------------
Chi-Squared = 57.25912 using 59 PHA bins.
Reduced chi-squared = 1.004546 for 57 degrees of freedom
Null hypothesis probability = 0.465
Photon flux (15-150 keV) in 1.000 sec: 3.57538 ( -0.48159 0.48492 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93893e-07 ( -3.7444e-08 3.7509e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 107.852 sec. to 108.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.494263 ( -1.11710 0.882185 )
Epeak [keV] : 107.098 ( -32.2017 9892.90 )
Norm@50keV : 6.893167E-02 ( -4.006254E-02 0.132465 )
------------------------------------------------------------
Chi-Squared = 54.77334 using 59 PHA bins.
Reduced chi-squared = 0.9780954 for 56 degrees of freedom
Null hypothesis probability = 0.521
Photon flux (15-150 keV) in 1.000 sec: 3.46503 ( -0.4954 0.49845 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89738e-07 ( -1.9618e-08 3.8641e-08 ) ergs/cm2
Band function
Time interval is from 107.852 sec. to 108.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.493721 ( -0.882063 0.972860 )
beta : -9.32741 ( -0.672585 8.07950 )
Epeak [keV] : 107.033 ( -32.1546 9892.97 )
Norm@50keV : 6.897859E-02 ( -4.012084E-02 0.132784 )
------------------------------------------------------------
Chi-Squared = 54.77337 using 59 PHA bins.
Reduced chi-squared = 0.9958794 for 55 degrees of freedom
Null hypothesis probability = 0.483
Photon flux (15-150 keV) in 1.000 sec: 3.46531 ( -0.49569 0.49894 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89588e-07 ( -3.9013e-08 3.859e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 21:38:04 EST 2008