batgrbproduct Analysis for Trigger=275087
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 17:02:57 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger275087/SDC
======================================================================
Trigger: 00275087 Segment: 000
BAT Trigger Time: 198015155.2 [s; MET]
Trigger Stop: 198015159.296 [s; MET]
UTC: 2007-04-11T20:12:33.316080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 107.337604211936 Dec: 1.08250430991337 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.52
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 10.52
Flight Position: [ source = BAT ]
RA: 107.337604211936 Dec: 1.08250430991337 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 107.338763162796 Dec: 1.06329780074369 [deg; J2000]
{ 07h 09m 21.3s , +01d 03' 47.9" }
+/- 1.57641132699319 [arcmin] (estimated 90% radius based on SNR)
+/- 0.527230286587824 [arcmin] (formal 1-sigma fit error)
SNR: 15.875715706925
RA = 7h 9m 21.3s (107.338763 deg.)
Dec = 1d 3' 48" (1.063298 deg.)
Angular difference between Flight and Ground position is 1.154486 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 122.752000004053 +/- 17.1528452525509
Measured from: -32.3599999845028
to: 90.3920000195503 [s; relative to TRIGTIME]
T50: 65.0640000104904 +/- 4.09533785300885
Measured from: 5.18400001525879
to: 70.2480000257492 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 70.2240000069141
to: 71.2240000069141 [s; relative to TRIGTIME]
Total Fluence
Measured from: -60.4679999947548
to: 109.536000013351 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.556404 1.739325 1.131037 0.299826
0.076053 0.075491 0.065986 0.056767 [error]
Peak 0.037091 0.041664 0.029884 0.006532
0.005348 0.005619 0.004789 0.004028 [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 4.77e-07 7.56e-07 9.02e-07 2.10e-06 2.74e-06 4.24e-06 erg/cm2
Error 4.56e-08 4.12e-08 6.76e-08 3.48e-07 1.56e-07 3.95e-07 erg/cm2
Peak flux Power-law 3.34e-01 3.22e-01 2.18e-01 2.30e-01 9.66e-01 1.10e+00 ph/cm2/s
Error 7.84e-02 4.71e-02 4.02e-02 8.65e-02 1.37e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 4.77e-07 7.57e-07 9.03e-07 2.08e-06 2.74e-06 4.08e-06 erg/cm2
Error 4.56e-08 4.12e-08 6.78e-08 3.46e-07 1.56e-07 5.60e-07 erg/cm2
Peak flux Cutoff-PL 3.21e-01 3.31e-01 2.22e-01 1.70e-01 9.58e-01 1.04e+00 ph/cm2/s
Error 8.97e-02 5.74e-02 4.41e-02 1.32e-01 1.39e-01 1.99e-01 ph/cm2/s
Fluence Band 4.72e-07 7.55e-07 9.00e-07 2.09e-06 2.74e-06 4.22e-06 erg/cm2
Error 4.76e-08 4.64e-08 6.84e-08 3.80e-07 1.59e-07 4.25e-07 erg/cm2
Peak flux Band 3.18e-01 1.07e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.97e-01 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 1.745 0.104 - - 1.75e-03 9.51e-05 55.799 57
CPL 1.711 0.000 481.4 0.0 1.81e-03 3.89e-04 56.123 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.568 0.247 - - 7.59e-03 1.10e-03 53.402 57
CPL 1.336 1.015 139.1 5000.0 1.01e-02 1.87e-02 53.191 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: 97.024000 sec.
T50 in the 50-300 keV band: 51.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 170.004 -60.468 109.536
T90 122.752 -32.360 90.392
T50 65.064 5.184 70.248
Peak 1.000 70.224 71.224
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
107.3388 +1.0633 0.0121 29.2 14.2 2.1897 15.9 TRIG_00275087
------------------------------------------
Foreground time interval of the image:
-60.468 39.805 (delta_t = 100.273 [sec])
Background time interval of the image:
-239.200 -60.468 (delta_t = 178.732 [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 -60.468 sec. to 109.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74456 ( -0.103315 0.104341 )
Norm@50keV : 1.747688E-03 ( -9.546254E-05 9.473704E-05) )
------------------------------------------------------------
Chi-Squared = 55.79889 using 59 PHA bins.
Reduced chi-squared = 0.9789278 for 57 degrees of freedom
Null hypothesis probability = 0.520
Photon flux (15-150 keV) in 170.0 sec: 0.235843 ( -0.013069 0.013136 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74237e-06 ( -1.55125e-07 1.55992e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -60.468 sec. to 109.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71081 ( )
Epeak [keV] : 481.410 ( )
Norm@50keV : 1.810724E-03 ( -1.310743E-04 6.459717E-04) )
------------------------------------------------------------
Chi-Squared = 56.12290 using 59 PHA bins.
Reduced chi-squared = 1.002195 for 56 degrees of freedom
Null hypothesis probability = 0.470
Photon flux (15-150 keV) in 170.0 sec: 0.235731 ( -0.013063 0.01313 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74234e-06 ( -1.55074e-07 1.564e-07 ) ergs/cm2
Band function
Time interval is from -60.468 sec. to 109.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29243 ( -8.70757 3.21381 )
beta : -1.74953 ( -0.145341 0.107492 )
Epeak [keV] : 35.1839 ( -35.0839 9964.82 )
Norm@50keV : 3.960724E-03 ( -3.960724E-03 24.2938 )
------------------------------------------------------------
Chi-Squared = 55.76032 using 59 PHA bins.
Reduced chi-squared = 1.013824 for 55 degrees of freedom
Null hypothesis probability = 0.446
Photon flux (15-150 keV) in 170.0 sec: 0.235757 ( -0.014549 0.012989 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73901e-06 ( -1.63455e-07 1.53595e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 70.224 sec. to 71.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56785 ( -0.244455 0.248825 )
Norm@50keV : 7.593196E-03 ( -1.111014E-03 1.094735E-03) )
------------------------------------------------------------
Chi-Squared = 53.40158 using 59 PHA bins.
Reduced chi-squared = 0.9368699 for 57 degrees of freedom
Null hypothesis probability = 0.611
Photon flux (15-150 keV) in 1.000 sec: 0.966296 ( -0.136424 0.136624 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.13136e-08 ( -1.11937e-08 1.1328e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 70.224 sec. to 71.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33564 ( -1.11383 0.915869 )
Epeak [keV] : 139.112 ( -139.102 9860.89 )
Norm@50keV : 1.005082E-02 ( -1.005082E-02 2.740530E-02) )
------------------------------------------------------------
Chi-Squared = 53.19100 using 59 PHA bins.
Reduced chi-squared = 0.9498393 for 56 degrees of freedom
Null hypothesis probability = 0.582
Photon flux (15-150 keV) in 1.000 sec: 0.958244 ( -0.139165 0.138306 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0094e-08 ( -1.23366e-08 1.21421e-08 ) ergs/cm2
Band function
Time interval is from 70.224 sec. to 71.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08162 ( -8.91838 3.87854 )
beta : -1.72164 ( -8.27836 0.386612 )
Epeak [keV] : 77.0226 ( -76.9226 2282.28 )
Norm@50keV : 1.444458E-02 ( -31.1235 1780.66 )
------------------------------------------------------------
Chi-Squared = 53.14701 using 59 PHA bins.
Reduced chi-squared = 0.9663094 for 55 degrees of freedom
Null hypothesis probability = 0.546
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 17:19:39 EST 2007