batgrbproduct Analysis for Trigger=151207
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 17:11:04 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger151207/SDC
======================================================================
Trigger: 00151207 Segment: 000
BAT Trigger Time: 146212492.8 [s; MET]
Trigger Stop: 146212493.824 [s; MET]
UTC: 2005-08-20T06:34:53.115840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 337.39960673239 Dec: 19.5782013718259 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.38
Image Trigger?: NO
Rate S/N Ratio: 15.6204993518133 [ if not an image trigger ]
Image S/N Ratio: 8.38
Flight Position: [ source = BAT ]
RA: 337.39960673239 Dec: 19.5782013718259 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 337.414216303254 Dec: 19.5651041321853 [deg; J2000]
{ 22h 29m 39.4s , +19d 33' 54.4" }
+/- 1.11515518424002 [arcmin] (estimated 90% radius based on SNR)
+/- 0.35080909642071 [arcmin] (formal 1-sigma fit error)
SNR: 26.0313392336684
RA = 22h 29m 39.4s (337.414216 deg.)
Dec = 19d 33' 54" (19.565104 deg.)
Angular difference between Flight and Ground position is 1.140041 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 244.692000001669 +/- 22.6761161724926
Measured from: -7.80799999833107
to: 236.884000003338 [s; relative to TRIGTIME]
T50: 117.587999999523 +/- 112.727952656873
Measured from: 116
to: 233.587999999523 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 229.523999989033
to: 230.523999989033 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.4640000164509
to: 237.67999997735 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.294808 1.799400 1.643642 0.522755
0.089597 0.098913 0.098746 0.106047 [error]
Peak 0.064505 0.116620 0.110100 0.042033
0.008086 0.009941 0.010779 0.011960 [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 3.53e-07 7.60e-07 1.28e-06 4.97e-06 3.53e-06 7.33e-06 erg/cm2
Error 4.19e-08 5.10e-08 9.97e-08 9.01e-07 2.47e-07 9.62e-07 erg/cm2
Peak flux Power-law 5.79e-01 7.71e-01 7.55e-01 1.32e+00 2.54e+00 3.43e+00 ph/cm2/s
Error 1.02e-01 8.29e-02 8.56e-02 3.19e-01 2.41e-01 3.89e-01 ph/cm2/s
Fluence Cutoff-PL 3.53e-07 7.60e-07 1.28e-06 4.93e-06 3.53e-06 7.28e-06 erg/cm2
Error 4.19e-08 5.11e-08 9.99e-08 8.95e-07 2.47e-07 9.56e-07 erg/cm2
Peak flux Cutoff-PL 4.95e-01 8.28e-01 8.15e-01 5.85e-01 2.47e+00 2.72e+00 ph/cm2/s
Error 1.24e-01 1.01e-01 1.05e-01 4.45e-01 2.49e-01 4.95e-01 ph/cm2/s
Fluence Band 3.50e-07 7.57e-07 1.28e-06 4.93e-06 3.52e-06 7.31e-06 erg/cm2
Error 4.15e-08 5.09e-08 9.97e-08 8.94e-07 2.47e-07 9.55e-07 erg/cm2
Peak flux Band 4.95e-01 8.28e-01 8.15e-01 5.85e-01 2.47e+00 2.72e+00 ph/cm2/s
Error 1.24e-01 1.01e-01 1.05e-01 4.69e-01 2.49e-01 4.95e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.117 - - 1.31e-03 7.86e-05 59.267 57
CPL 1.240 0.117 9998.3 5000.0 1.32e-03 7.90e-05 59.299 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.031 0.164 - - 2.20e-02 2.09e-03 66.257 57
CPL 0.233 0.770 116.2 203.8 5.39e-02 5.46e-02 62.395 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: 130.176000 sec.
T50 in the 50-300 keV band: 66.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 268.144 -30.464 237.680
T90 244.692 -7.808 236.884
T50 117.588 116.000 233.588
Peak 1.000 229.524 230.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
337.4142 +19.5651 0.0074 20.4 128.3 2.1130 26.0 TRIG_00151207
------------------------------------------
Foreground time interval of the image:
-30.464 22.805 (delta_t = 53.269 [sec])
Background time interval of the image:
-299.800 -30.464 (delta_t = 269.336 [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 -30.464 sec. to 237.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24342 ( -0.116792 0.116402 )
Norm@50keV : 1.311721E-03 ( -7.864821E-05 7.853622E-05) )
------------------------------------------------------------
Chi-Squared = 59.26654 using 59 PHA bins.
Reduced chi-squared = 1.039764 for 57 degrees of freedom
Null hypothesis probability = 0.393
Photon flux (15-150 keV) in 268.1 sec: 0.154977 ( -0.009433 0.009451 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52568e-06 ( -2.46169e-07 2.48073e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.464 sec. to 237.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23952 ( -0.117581 0.117134 )
Epeak [keV] : 9998.26 ( -9998.25 1.73535 )
Norm@50keV : 1.317625E-03 ( -7.911702E-05 7.898163E-05) )
------------------------------------------------------------
Chi-Squared = 59.29900 using 59 PHA bins.
Reduced chi-squared = 1.058911 for 56 degrees of freedom
Null hypothesis probability = 0.356
Photon flux (15-150 keV) in 268.1 sec: 0.154919 ( -0.009429 0.009448 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5261e-06 ( -2.46303e-07 2.4818e-07 ) ergs/cm2
Band function
Time interval is from -30.464 sec. to 237.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.895796 ( -9.10420 5.05262 )
beta : -1.25316 ( -0.133368 0.122893 )
Epeak [keV] : 82.1806 ( -82.0806 9907.75 )
Norm@50keV : 2.355917E-03 ( -1.037983E-03 21.7775 )
------------------------------------------------------------
Chi-Squared = 59.10550 using 59 PHA bins.
Reduced chi-squared = 1.074646 for 55 degrees of freedom
Null hypothesis probability = 0.328
Photon flux (15-150 keV) in 268.1 sec: 0.154977 ( -0.009238 0.056999 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52345e-06 ( -2.46438e-07 2.47858e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 229.524 sec. to 230.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03124 ( -0.164380 0.163087 )
Norm@50keV : 2.200937E-02 ( -2.091158E-03 2.090268E-03) )
------------------------------------------------------------
Chi-Squared = 66.25710 using 59 PHA bins.
Reduced chi-squared = 1.162405 for 57 degrees of freedom
Null hypothesis probability = 0.188
Photon flux (15-150 keV) in 1.000 sec: 2.53867 ( -0.24095 0.24093 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35485e-07 ( -2.6557e-08 2.6765e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 229.524 sec. to 230.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.233324 ( -0.841490 0.699394 )
Epeak [keV] : 116.197 ( -35.7978 371.885 )
Norm@50keV : 5.388469E-02 ( -2.884812E-02 8.035035E-02) )
------------------------------------------------------------
Chi-Squared = 62.39480 using 59 PHA bins.
Reduced chi-squared = 1.114193 for 56 degrees of freedom
Null hypothesis probability = 0.259
Photon flux (15-150 keV) in 1.000 sec: 2.47413 ( -0.24997 0.24886 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2233e-07 ( -2.9835e-08 2.9895e-08 ) ergs/cm2
Band function
Time interval is from 229.524 sec. to 230.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.232638 ( -0.700290 0.841043 )
beta : -9.23360 ( -0.766398 8.21860 )
Epeak [keV] : 116.127 ( -35.7540 372.948 )
Norm@50keV : 5.392800E-02 ( -2.889589E-02 8.034363E-02) )
------------------------------------------------------------
Chi-Squared = 62.39479 using 59 PHA bins.
Reduced chi-squared = 1.134451 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 1.000 sec: 2.47406 ( -0.2499 0.24896 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22244e-07 ( -2.9835e-08 2.9875e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 17:27:26 EST 2008