batgrbproduct Analysis for Trigger=275119
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 17:20:32 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger275119/GCN5_download_cron
======================================================================
Trigger: 00275119 Segment: 000
BAT Trigger Time: 198034025.28 [s; MET]
Trigger Stop: 198034025.792 [s; MET]
UTC: 2007-04-12T01:27:03.395620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 181.505172705328 Dec: 40.1008001435465 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.32
Image Trigger?: NO
Rate S/N Ratio: 8.94427190999916 [ if not an image trigger ]
Image S/N Ratio: 7.32
Flight Position: [ source = BAT ]
RA: 181.505172705328 Dec: 40.1008001435465 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 181.560971460627 Dec: 40.1241185951906 [deg; J2000]
{ 12h 06m 14.6s , +40d 07' 26.8" }
+/- 2.07796177046806 [arcmin] (estimated 90% radius based on SNR)
+/- 0.819713164983387 [arcmin] (formal 1-sigma fit error)
SNR: 10.6991788335516
RA = 12h 6m 14.6s (181.560971 deg.)
Dec = 40d 7' 27" (40.124119 deg.)
Angular difference between Flight and Ground position is 2.917757 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 48 +/- 35.7770876399966
Measured from: -15.2800000011921
to: 32.7199999988079 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.719999998807907
to: 16.7199999988079 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.21999999880791
to: 9.21999999880791 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2800000011921
to: 48.7199999988079 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.261278 0.355656 0.212649 -0.034682
0.037297 0.038894 0.038127 0.041983 [error]
Peak 0.114671 0.174811 0.117953 0.013654
0.019094 0.019868 0.019372 0.021085 [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 7.70e-08 1.32e-07 1.73e-07 4.59e-07 5.07e-07 8.34e-07 erg/cm2
Error 1.52e-08 1.73e-08 3.58e-08 1.96e-07 8.43e-08 2.31e-07 erg/cm2
Peak flux Power-law 6.61e-02 7.06e-02 5.35e-02 6.60e-02 2.15e-01 2.56e-01 ph/cm2/s
Error 1.54e-02 9.98e-03 9.94e-03 2.57e-02 2.90e-02 3.77e-02 ph/cm2/s
Fluence Cutoff-PL 7.17e-08 1.46e-07 1.67e-07 1.19e-07 4.57e-07 5.02e-07 erg/cm2
Error 1.72e-08 2.49e-08 4.33e-08 2.89e-07 9.98e-08 3.06e-07 erg/cm2
Peak flux Cutoff-PL 6.25e-02 7.37e-02 5.44e-02 3.89e-02 2.11e-01 2.29e-01 ph/cm2/s
Error 1.83e-02 1.31e-02 1.08e-02 4.61e-02 3.11e-02 5.39e-02 ph/cm2/s
Fluence Band 7.11e-08 1.46e-07 1.64e-07 2.12e-07 4.62e-07 5.88e-07 erg/cm2
Error 1.71e-08 2.66e-08 4.40e-08 3.02e-07 8.89e-08 2.70e-07 erg/cm2
Peak flux Band 6.13e-02 2.40e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 4.90e-02 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.612 0.241 - - 8.48e-04 1.28e-04 50.893 57
CPL 0.807 1.137 62.8 4977.1 2.45e-03 7.04e-03 49.099 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.399 0.250 - - 1.77e-03 2.52e-04 66.443 57
CPL 1.006 0.962 117.6 4961.7 2.87e-03 7.23e-03 66.097 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: 15.808000 sec.
T50 in the 50-300 keV band: 7.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 -15.280 48.720
T90 48.000 -15.280 32.720
T50 16.000 0.720 16.720
Peak 1.000 8.220 9.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
181.5610 +40.1241 0.0179 10.6 -65.7 0.5551 10.7 TRIG_00275119
------------------------------------------
Foreground time interval of the image:
-15.280 8.721 (delta_t = 24.001 [sec])
Background time interval of the image:
-239.280 -15.280 (delta_t = 224.000 [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 -15.280 sec. to 48.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61204 ( -0.236839 0.244603 )
Norm@50keV : 8.482373E-04 ( -1.294490E-04 1.266936E-04) )
------------------------------------------------------------
Chi-Squared = 50.89274 using 59 PHA bins.
Reduced chi-squared = 0.8928550 for 57 degrees of freedom
Null hypothesis probability = 0.702
Photon flux (15-150 keV) in 64.00 sec: 0.109413 ( -0.0142933 0.014294 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06975e-07 ( -8.27597e-08 8.57542e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.280 sec. to 48.720 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.807437 ( -1.32903 0.944243 )
Epeak [keV] : 62.8371 ( -17.1433 9937.16 )
Norm@50keV : 2.447731E-03 ( -2.447731E-03 1.162836E-02) )
------------------------------------------------------------
Chi-Squared = 49.09896 using 59 PHA bins.
but latest trial 38.1710 gives Chi-Squared = 6.21587
Reduced chi-squared = 0.8767672 for 56 degrees of freedom
Null hypothesis probability = 0.731
Photon flux (15-150 keV) in 64.00 sec: 0.105591 ( -0.014695 0.015048 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56517e-07 ( -9.41709e-08 1.05366e-07 ) ergs/cm2
Band function
Time interval is from -15.280 sec. to 48.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.662573 ( -11.2507 3.37853 )
beta : -2.35892 ( -8.19781 0.332560 )
Epeak [keV] : 57.7162 ( -31.0691 619.945 )
Norm@50keV : 3.023295E-03 ( -30.5740 14.0857 )
------------------------------------------------------------
Chi-Squared = 49.00867 using 59 PHA bins.
Reduced chi-squared = 0.8910668 for 55 degrees of freedom
Null hypothesis probability = 0.702
Photon flux (15-150 keV) in 64.00 sec: 0.105946 ( -0.0150239 0.015206 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.62247e-07 ( -6.65805e-08 1.1125e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.720 sec. to 16.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39949 ( -0.248764 0.251412 )
Norm@50keV : 1.767420E-03 ( -2.538641E-04 2.502683E-04) )
------------------------------------------------------------
Chi-Squared = 66.44281 using 59 PHA bins.
Reduced chi-squared = 1.165663 for 57 degrees of freedom
Null hypothesis probability = 0.184
Photon flux (15-150 keV) in 16.00 sec: 0.215214 ( -0.029018 0.029026 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73309e-07 ( -4.47392e-08 4.59312e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.720 sec. to 16.720 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.00619 ( -1.41119 0.512411 )
Epeak [keV] : 117.602 ( -40.9600 9882.40 )
Norm@50keV : 2.873526E-03 ( -1.338601E-03 1.311653E-02) )
------------------------------------------------------------
Chi-Squared = 66.09650 using 59 PHA bins.
but latest trial 1.90554 gives Chi-Squared = 10.6469
but latest trial 49.2681 gives Chi-Squared = 5.65113
Reduced chi-squared = 1.180295 for 56 degrees of freedom
Null hypothesis probability = 0.167
Photon flux (15-150 keV) in 16.00 sec: 0.211289 ( -0.031664 0.0306 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61016e-07 ( -5.61136e-08 5.44576e-08 ) ergs/cm2
Band function
Time interval is from 0.720 sec. to 16.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.873607 ( -9.12639 2.01107 )
beta : -1.74089 ( -8.25911 0.554412 )
Epeak [keV] : 94.4117 ( -84.3117 1554.35 )
Norm@50keV : 3.448262E-03 ( -3.973253E-03 802.351 )
------------------------------------------------------------
Chi-Squared = 65.73507 using 59 PHA bins.
Reduced chi-squared = 1.195183 for 55 degrees of freedom
Null hypothesis probability = 0.152
Photon flux (15-150 keV) in 16.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 17:42:21 EST 2007