batgrbproduct Analysis for Trigger=261132
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 14:00:03 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger261132/GCN5_download_cron
======================================================================
Trigger: 00261132 Segment: 000
BAT Trigger Time: 193540217.92 [s; MET]
Trigger Stop: 193540219.968 [s; MET]
UTC: 2007-02-19T01:10:16.146540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 260.198428896005 Dec: 69.3642687369038 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: NO
Rate S/N Ratio: 14.5945195193264 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 260.198428896005 Dec: 69.3642687369038 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 260.197231442157 Dec: 69.3612110649323 [deg; J2000]
{ 17h 20m 47.3s , +69d 21' 40.4" }
+/- 1.96203514657123 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00865218329644 [arcmin] (formal 1-sigma fit error)
SNR: 11.6135724391147
RA = 17h 20m 47.3s (260.197231 deg.)
Dec = 69d 21' 40" (69.361211 deg.)
Angular difference between Flight and Ground position is 0.185200 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 22 +/- 5.65685424949238
Measured from: -5.91999998688698
to: 16.080000013113 [s; relative to TRIGTIME]
T50: 8 +/- 3.16227766016838
Measured from: 0.0800000131130219
to: 8.08000001311302 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.08000001311302
to: 2.08000001311302 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.91999998688698
to: 19.080000013113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.266359 0.248428 0.137003 0.025603
0.026271 0.026079 0.022449 0.019156 [error]
Peak 0.028737 0.026474 0.014003 0.006840
0.005400 0.005429 0.004618 0.003829 [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 7.14e-08 1.02e-07 1.09e-07 2.16e-07 3.50e-07 5.00e-07 erg/cm2
Error 1.25e-08 1.19e-08 2.20e-08 8.89e-08 4.97e-08 1.11e-07 erg/cm2
Peak flux Power-law 2.70e-01 2.06e-01 1.05e-01 7.66e-02 6.15e-01 6.57e-01 ph/cm2/s
Error 8.16e-02 4.25e-02 3.89e-02 5.59e-02 1.27e-01 1.38e-01 ph/cm2/s
Fluence Cutoff-PL 7.09e-08 1.02e-07 1.09e-07 2.14e-07 3.50e-07 4.34e-07 erg/cm2
Error 1.27e-08 1.19e-08 2.21e-08 8.81e-08 4.97e-08 1.53e-07 erg/cm2
Peak flux Cutoff-PL 2.70e-01 2.06e-01 1.05e-01 7.61e-02 6.15e-01 6.56e-01 ph/cm2/s
Error 8.16e-02 4.25e-02 3.90e-02 5.56e-02 1.26e-01 1.38e-01 ph/cm2/s
Fluence Band 7.12e-08 1.02e-07 1.09e-07 2.14e-07 3.50e-07 4.94e-07 erg/cm2
Error 1.34e-08 9.97e-09 2.22e-08 6.79e-08 4.97e-08 1.48e-07 erg/cm2
Peak flux Band 6.48e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 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 1.908 0.231 - - 1.47e-03 2.11e-04 62.647 57
CPL 1.696 0.000 64.2 0.0 1.90e-03 1.81e-03 62.842 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.973 0.433 - - 4.15e-03 1.15e-03 51.951 57
CPL 1.974 1.192 9919.1 1160.5 4.16e-03 1.86e-02 51.951 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 26.000 -6.920 19.080
T90 22.000 -5.920 16.080
T50 8.000 0.080 8.080
Peak 1.000 1.080 2.080
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
260.1972 +69.3612 0.0166 14.4 130.3 0.6217 11.6 TRIG_00261132
------------------------------------------
Foreground time interval of the image:
-6.920 19.080 (delta_t = 26.000 [sec])
Background time interval of the image:
-83.619 -6.920 (delta_t = 76.699 [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 -6.920 sec. to 19.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90781 ( -0.225080 0.236696 )
Norm@50keV : 1.465719E-03 ( -2.142892E-04 2.075932E-04) )
------------------------------------------------------------
Chi-Squared = 62.64679 using 59 PHA bins.
Reduced chi-squared = 1.099066 for 57 degrees of freedom
Null hypothesis probability = 0.283
Photon flux (15-150 keV) in 26.00 sec: 0.211047 ( -0.024497 0.024509 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50392e-07 ( -4.91426e-08 5.03308e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.920 sec. to 19.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69609 ( )
Epeak [keV] : 64.2337 ( )
Norm@50keV : 1.897153E-03 ( -3.472265E-04 3.273282E-03) )
------------------------------------------------------------
Chi-Squared = 62.84208 using 59 PHA bins.
Reduced chi-squared = 1.122180 for 56 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 26.00 sec: 0.210973 ( -0.024488 0.024501 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50381e-07 ( -4.914e-08 5.03438e-08 ) ergs/cm2
Band function
Time interval is from -6.920 sec. to 19.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49703 ( -8.82297 6.17703 )
beta : -1.91079 ( -8.08894 0.227290 )
Epeak [keV] : 21.4332 ( -21.3218 2859.98 )
Norm@50keV : 3.410131E-03 ( -6.190427E-03 946.679 )
------------------------------------------------------------
Chi-Squared = 62.63319 using 59 PHA bins.
Reduced chi-squared = 1.138785 for 55 degrees of freedom
Null hypothesis probability = 0.224
Photon flux (15-150 keV) in 26.00 sec: 0.211783 ( -0.024482 0.024482 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49731e-07 ( -4.93532e-08 4.99486e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.080 sec. to 2.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97258 ( -0.403308 0.462469 )
Norm@50keV : 4.154114E-03 ( -1.191978E-03 1.111771E-03) )
------------------------------------------------------------
Chi-Squared = 51.95073 using 59 PHA bins.
Reduced chi-squared = 0.9114164 for 57 degrees of freedom
Null hypothesis probability = 0.664
Photon flux (15-150 keV) in 1.000 sec: 0.615397 ( -0.126536 0.126539 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82539e-08 ( -9.8537e-09 1.0339e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.080 sec. to 2.080 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97413 ( -1.74754 0.637399 )
Epeak [keV] : 9919.06 ( -2240.14 80.9404 )
Norm@50keV : 4.159139E-03 ( -1.202723E-03 3.606054E-02) )
------------------------------------------------------------
Chi-Squared = 51.95100 using 59 PHA bins.
but latest trial 3.23755 gives Chi-Squared = 13.1417
Reduced chi-squared = 0.9276965 for 56 degrees of freedom
Null hypothesis probability = 0.629
Photon flux (15-150 keV) in 1.000 sec: 0.615189 ( -0.126494 0.126499 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82468e-08 ( -9.855e-09 1.03484e-08 ) ergs/cm2
Band function
Time interval is from 1.080 sec. to 2.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.87273 ( -6.62281 6.58479 )
beta : -9.14311 ( -0.462270 0.403466 )
Epeak [keV] : 60.2825 ( -60.1825 9939.72 )
Norm@50keV : 4.674780E-03 ( -0.162018 0.151111 )
------------------------------------------------------------
Chi-Squared = 51.98946 using 59 PHA bins.
Reduced chi-squared = 0.9452629 for 55 degrees of freedom
Null hypothesis probability = 0.590
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 14:23:17 EST 2007