batgrbproduct Analysis for Trigger=131185
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): Sun Jan 6 19:10:13 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131185/SDC
======================================================================
Trigger: 00131185 Segment: 000
BAT Trigger Time: 139321470.08 [s; MET]
Trigger Stop: 139321471.488 [s; MET]
UTC: 2005-06-01T12:24:30.529040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.812860688764 Dec: 32.2341754971176 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: NO
Rate S/N Ratio: 22.8254244210267 [ if not an image trigger ]
Image S/N Ratio: 11
Flight Position: [ source = BAT ]
RA: 291.812860688764 Dec: 32.2341754971176 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.833418083326 Dec: 32.2261424815887 [deg; J2000]
{ 19h 27m 20.0s , +32d 13' 34.1" }
+/- 1.51230264189705 [arcmin] (estimated 90% radius based on SNR)
+/- 0.574537263505543 [arcmin] (formal 1-sigma fit error)
SNR: 16.8458003855617
RA = 19h 27m 20.0s (291.833418 deg.)
Dec = 32d 13' 34" (32.226142 deg.)
Angular difference between Flight and Ground position is 1.149330 arcmin
Partial Coding Fraction: 0.2402344 [ including projection effects ]
Duration
T90: 1.75600001215935 +/- 0.172185947395982
Measured from: 0.151999980211258
to: 1.90799999237061 [s; relative to TRIGTIME]
T50: 0.848000019788742 +/- 0.264756495330352
Measured from: 0.447999984025955
to: 1.2960000038147 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.15599998831749
to: 1.15599998831749 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0679999887943268
to: 2.05199998617172 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.089498 0.176681 0.168056 0.064456
0.015460 0.016888 0.016467 0.012584 [error]
Peak 0.048547 0.098064 0.131627 0.029697
0.010897 0.012362 0.012435 0.009487 [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 3.04e-08 7.36e-08 1.42e-07 6.70e-07 3.84e-07 8.92e-07 erg/cm2
Error 6.45e-09 9.33e-09 1.48e-08 1.61e-07 3.90e-08 0.00e+00 erg/cm2
Peak flux Power-law 5.40e-01 7.64e-01 8.01e-01 1.55e+00 2.59e+00 3.65e+00 ph/cm2/s
Error 1.38e-01 1.21e-01 9.23e-02 3.83e-01 3.16e-01 4.38e-01 ph/cm2/s
Fluence Cutoff-PL 2.88e-08 7.46e-08 1.44e-07 6.18e-07 3.84e-07 6.70e-07 erg/cm2
Error 7.44e-09 9.96e-09 1.73e-08 2.80e-07 3.81e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.61e-01 7.75e-01 8.62e-01 1.03e+00 2.55e+00 3.13e+00 ph/cm2/s
Error 1.81e-01 1.30e-01 1.35e-01 5.74e-01 3.21e-01 7.22e-01 ph/cm2/s
Fluence Band 2.97e-08 7.37e-08 1.43e-07 6.20e-07 3.83e-07 5.83e-07 erg/cm2
Error 7.22e-09 9.87e-09 1.74e-08 2.80e-07 3.93e-08 0.00e+00 erg/cm2
Peak flux Band 4.57e-01 7.87e-01 8.55e-01 1.25e+00 2.53e+00 3.22e+00 ph/cm2/s
Error 2.18e-01 1.42e-01 1.28e-01 4.52e-01 3.33e-01 5.11e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.054 0.174 - - 1.82e-02 1.84e-03 48.584 57
CPL 0.992 0.459 932.2 0.0 1.94e-02 1.85e-03 48.597 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.931 0.199 - - 2.26e-02 2.72e-03 53.356 57
CPL 0.423 0.844 194.0 5000.0 3.66e-02 3.62e-02 52.295 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: 1.216000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.984 0.068 2.052
T90 1.756 0.152 1.908
T50 0.848 0.448 1.296
Peak 1.000 0.156 1.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.8334 +32.2261 0.0115 40.4 36.0 0.5342 16.8 TRIG_00131185
------------------------------------------
Foreground time interval of the image:
0.068 2.052 (delta_t = 1.984 [sec])
Background time interval of the image:
-299.080 0.068 (delta_t = 299.148 [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 0.068 sec. to 2.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05412 ( -0.177162 0.170873 )
Norm@50keV : 1.823101E-02 ( -1.849225E-03 1.833202E-03) )
------------------------------------------------------------
Chi-Squared = 48.58391 using 59 PHA bins.
Reduced chi-squared = 0.8523493 for 57 degrees of freedom
Null hypothesis probability = 0.779
Photon flux (15-150 keV) in 1.984 sec: 2.10632 ( -0.2215 0.22223 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83966e-07 ( -3.90372e-08 3.90074e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 2.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.991860 ( -0.687990 0.229210 )
Epeak [keV] : 932.236 ( )
Norm@50keV : 1.944609E-02 ( -1.854243E-03 1.839159E-03) )
------------------------------------------------------------
Chi-Squared = 48.59652 using 59 PHA bins.
Reduced chi-squared = 0.8677951 for 56 degrees of freedom
Null hypothesis probability = 0.748
Photon flux (15-150 keV) in 1.984 sec: 2.10584 ( -0.22139 0.22253 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83682e-07 ( -3.87455e-08 3.7454e-08 ) ergs/cm2
Band function
Time interval is from 0.068 sec. to 2.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.519343 ( -9.48066 4.70157 )
beta : -1.15827 ( -8.84173 0.256037 )
Epeak [keV] : 125.510 ( -125.410 694.894 )
Norm@50keV : 3.469022E-02 ( -1.781148E-02 538.415 )
------------------------------------------------------------
Chi-Squared = 47.88148 using 59 PHA bins.
Reduced chi-squared = 0.8705724 for 55 degrees of freedom
Null hypothesis probability = 0.741
Photon flux (15-150 keV) in 1.984 sec: 2.07180 ( -0.23174 0.2298 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83426e-07 ( -3.91582e-08 3.9436e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.931129 ( -0.203675 0.194452 )
Norm@50keV : 2.256481E-02 ( -2.739396E-03 2.698407E-03) )
------------------------------------------------------------
Chi-Squared = 53.35637 using 59 PHA bins.
Reduced chi-squared = 0.9360767 for 57 degrees of freedom
Null hypothesis probability = 0.613
Photon flux (15-150 keV) in 1.000 sec: 2.59116 ( -0.31523 0.31702 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50218e-07 ( -2.9143e-08 2.9219e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.422770 ( -1.03145 0.656398 )
Epeak [keV] : 194.007 ( -193.997 9805.99 )
Norm@50keV : 3.657493E-02 ( -1.601997E-02 5.630231E-02) )
------------------------------------------------------------
Chi-Squared = 52.29531 using 59 PHA bins.
Reduced chi-squared = 0.9338447 for 56 degrees of freedom
Null hypothesis probability = 0.616
Photon flux (15-150 keV) in 1.000 sec: 2.55482 ( -0.3206 0.32166 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49169e-07 ( -3.0035e-08 2.9891e-08 ) ergs/cm2
Band function
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.785549 ( -9.21445 5.78555 )
beta : -0.931143 ( -0.194411 0.203802 )
Epeak [keV] : 45.1176 ( -45.0176 9954.88 )
Norm@50keV : 3.608122E-02 ( -4.733270E-03 82.9836 )
------------------------------------------------------------
Chi-Squared = 53.35637 using 59 PHA bins.
Reduced chi-squared = 0.9701158 for 55 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 1.000 sec: 2.52534 ( -0.3367 0.33005 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49139e-07 ( -3.0082e-08 2.9714e-08 ) ergs/cm2
Plot creation:
Sun Jan 6 19:19:54 EST 2008