batgrbproduct Analysis for Trigger=191512
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 Dec 31 13:01:28 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger191512/SDC
======================================================================
Trigger: 00191512 Segment: 000
BAT Trigger Time: 162082086.144 [s; MET]
Trigger Stop: 162082094.336 [s; MET]
UTC: 2006-02-19T22:48:05.118160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.806599596401 Dec: 32.3303789915981 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.2
Image Trigger?: NO
Rate S/N Ratio: 8.24621125123532 [ if not an image trigger ]
Image S/N Ratio: 7.2
Flight Position: [ source = BAT ]
RA: 241.806599596401 Dec: 32.3303789915981 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 241.857685444646 Dec: 32.3110429487737 [deg; J2000]
{ 16h 07m 25.8s , +32d 18' 39.8" }
+/- 2.21862631229323 [arcmin] (estimated 90% radius based on SNR)
+/- 0.994468502827914 [arcmin] (formal 1-sigma fit error)
SNR: 9.74344275990157
RA = 16h 7m 25.8s (241.857685 deg.)
Dec = 32d 18' 40" (32.311043 deg.)
Angular difference between Flight and Ground position is 2.838210 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 62.0680000185966 +/- 6.30087866724245
Measured from: -55.1159999966621
to: 6.95200002193451 [s; relative to TRIGTIME]
T50: 38.8400000035763 +/- 28.9538403054213
Measured from: -35.5119999945164
to: 3.32800000905991 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.06000000238419
to: 5.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -57.0679999887943
to: 8.24000000953674 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.399850 0.401534 0.062625 -0.005041
0.053975 0.047696 0.040242 0.033706 [error]
Peak 0.028243 0.022686 0.005941 0.004493
0.006941 0.006184 0.005005 0.004092 [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 1.47e-07 1.43e-07 9.68e-08 1.03e-07 4.28e-07 4.89e-07 erg/cm2
Error 2.88e-08 2.48e-08 3.33e-08 6.67e-08 7.95e-08 1.16e-07 erg/cm2
Peak flux Power-law 3.31e-01 1.65e-01 5.04e-02 1.96e-02 5.57e-01 5.66e-01 ph/cm2/s
Error 1.31e-01 6.26e-02 4.02e-02 3.24e-02 1.66e-01 1.70e-01 ph/cm2/s
Fluence Cutoff-PL 1.35e-07 1.67e-07 7.75e-08 1.05e-08 3.88e-07 3.89e-07 erg/cm2
Error 3.34e-08 3.47e-08 4.05e-08 4.71e-08 7.76e-08 9.15e-08 erg/cm2
Peak flux Cutoff-PL 3.31e-01 1.65e-01 5.03e-02 1.94e-02 5.57e-01 5.65e-01 ph/cm2/s
Error 1.31e-01 6.27e-02 4.02e-02 3.22e-02 1.66e-01 1.70e-01 ph/cm2/s
Fluence Band 1.34e-07 1.65e-07 7.78e-08 1.09e-08 3.88e-07 3.93e-07 erg/cm2
Error 2.46e-08 2.95e-08 1.57e-08 4.86e-08 5.08e-08 6.28e-08 erg/cm2
Peak flux Band 2.29e-01 1.63e-01 4.84e-02 1.82e-02 5.57e-01 5.46e-01 ph/cm2/s
Error 5.04e-02 1.72e-02 3.32e-02 1.66e-01 2.14e-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 2.562 0.339 - - 6.44e-04 1.63e-04 59.564 57
CPL 0.993 1.887 23.6 17.1 6.03e-03 5.93e-02 56.495 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.710 0.909 - - 2.48e-03 1.51e-03 51.075 57
CPL 1.950 1.178 2.5 0.0 7.08e-03 0.00e+00 51.664 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 65.308 -57.068 8.240
T90 62.068 -55.116 6.952
T50 38.840 -35.512 3.328
Peak 1.000 4.060 5.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
241.8577 +32.3110 0.0197 32.6 167.5 0.9807 9.7 TRIG_00191512
------------------------------------------
Foreground time interval of the image:
-57.068 8.240 (delta_t = 65.308 [sec])
Background time interval of the image:
-299.144 -57.068 (delta_t = 242.076 [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 -57.068 sec. to 8.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56176 ( -0.317629 0.360704 )
Norm@50keV : 6.438610E-04 ( -1.637746E-04 1.624448E-04) )
------------------------------------------------------------
Chi-Squared = 59.56426 using 59 PHA bins.
Reduced chi-squared = 1.044987 for 57 degrees of freedom
Null hypothesis probability = 0.383
Photon flux (15-150 keV) in 65.31 sec: 0.131429 ( -0.020397 0.020403 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27691e-07 ( -7.77607e-08 8.1294e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -57.068 sec. to 8.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.993042 ( -2.07261 1.70095 )
Epeak [keV] : 23.6148 ( -23.6048 10.6297 )
Norm@50keV : 6.031738E-03 ( -6.031738E-03 0.112562 )
------------------------------------------------------------
Chi-Squared = 56.49522 using 59 PHA bins.
Reduced chi-squared = 1.008843 for 56 degrees of freedom
Null hypothesis probability = 0.456
Photon flux (15-150 keV) in 65.31 sec: 0.125978 ( -0.020958 0.020979 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88036e-07 ( -7.17992e-08 8.33192e-08 ) ergs/cm2
Band function
Time interval is from -57.068 sec. to 8.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46170 ( -1.43840 1.43840 )
beta : -9.25118 ( -0.748825 6.67510 )
Epeak [keV] : 18.2185 ( -13.9044 8.29218 )
Norm@50keV : 3.080177E-03 ( -7.605164E-03 4.562196E-02) )
------------------------------------------------------------
Chi-Squared = 56.71045 using 59 PHA bins.
Reduced chi-squared = 1.031099 for 55 degrees of freedom
Null hypothesis probability = 0.411
Photon flux (15-150 keV) in 65.31 sec: 0.125947 ( -0.019841 0.019259 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88067e-07 ( -6.03223e-08 4.1368e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.060 sec. to 5.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70968 ( -0.719466 1.09805 )
Norm@50keV : 2.480669E-03 ( -1.544268E-03 1.474799E-03) )
------------------------------------------------------------
Chi-Squared = 51.07523 using 59 PHA bins.
Reduced chi-squared = 0.8960567 for 57 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 1.000 sec: 0.557207 ( -0.16646 0.16646 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64828e-08 ( -9.9417e-09 1.08545e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.060 sec. to 5.060 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95008 ( -2.27939 7.732022E-02) )
Epeak [keV] : 2.54072 ( )
Norm@50keV : 7.084598E-03 ( )
------------------------------------------------------------
Chi-Squared = 51.66402 using 59 PHA bins.
but latest trial -0.328755 gives Chi-Squared = 16.4802
Reduced chi-squared = 0.9225718 for 56 degrees of freedom
Null hypothesis probability = 0.640
Photon flux (15-150 keV) in 1.000 sec: 0.556955 ( -0.166394 0.166392 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64803e-08 ( -9.9427e-09 1.0852e-08 ) ergs/cm2
Band function
Time interval is from 4.060 sec. to 5.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.64840 ( -5.708122E-02 14.9429 )
beta : -2.60037 ( -1.09862 0.718778 )
Epeak [keV] : 5.05771 ( -4.95771 9994.94 )
Norm@50keV : 2.365979E-02 ( -0.210098 0.200547 )
------------------------------------------------------------
Chi-Squared = 51.12735 using 59 PHA bins.
Reduced chi-squared = 0.9295883 for 55 degrees of freedom
Null hypothesis probability = 0.623
Photon flux (15-150 keV) in 1.000 sec: 0.557104 ( -0.166438 0.166441 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66267e-08 ( -5.2429e-09 7.955e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 13:12:30 EST 2007