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 v2.45
Process Start Time (local time): Thu Jul 23 23:04:12 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/131185
======================================================================
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: 291.800675248121 Dec: 32.2513775146082 [deg; J2000]
{ 19h 27m 12.2s , +32d 15' 05.0" }
+/- 1.51188507621114 [arcmin] (estimated 90% radius based on SNR)
+/- 0.605375496703601 [arcmin] (formal 1-sigma fit error)
SNR: 16.8524473802784
Angular difference between Flight and Ground position is 1.203192 arcmin
Partial Coding Fraction: 0.2402344 [ including projection effects ]
Duration
T90: 1.80799999833107 +/- 0.273642084145151
Measured from: 0.0959999859333038
to: 1.90399998426437 [s; relative to TRIGTIME]
T50: 0.876000016927719 +/- 0.271911741582904
Measured from: 0.407999992370605
to: 1.28400000929832 [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: -0.116000026464462
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 0.094231 0.184023 0.172009 0.067407
0.015910 0.017627 0.016903 0.013213 [error]
Peak 0.048655 0.097626 0.128276 0.033013
0.010902 0.012375 0.012393 0.009606 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary (tot_pha/preslew_drm) ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 3.25e-08 7.77e-08 1.48e-07 6.87e-07 4.01e-07 9.44e-07 erg/cm2
Error 6.55e-09 9.42e-09 1.56e-08 1.65e-07 4.09e-08 1.73e-07 erg/cm2
Peak flux Power-law 5.28e-01 7.56e-01 8.04e-01 1.59e+00 2.58e+00 3.67e+00 ph/cm2/s
Error 1.33e-01 1.18e-01 9.31e-02 3.94e-01 3.11e-01 4.47e-01 ph/cm2/s
Fluence Cutoff-PL 3.21e-08 7.80e-08 1.49e-07 6.36e-07 4.01e-07 8.32e-07 erg/cm2
Error 7.32e-09 9.48e-09 1.77e-08 2.91e-07 4.09e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.65e-01 7.66e-01 8.51e-01 1.10e+00 2.55e+00 3.18e+00 ph/cm2/s
Error 1.72e-01 1.26e-01 1.29e-01 5.79e-01 3.19e-01 7.52e-01 ph/cm2/s
Fluence Band 3.20e-08 7.74e-08 1.48e-07 6.84e-07 4.01e-07 6.16e-07 erg/cm2
Error 6.49e-09 9.51e-09 1.56e-08 1.66e-07 4.09e-08 0.00e+00 erg/cm2
Peak flux Band 4.25e-01 7.83e-01 8.55e-01 1.29e+00 2.51e+00 3.24e+00 ph/cm2/s
Error 2.24e-01 1.31e-01 6.10e-02 9.56e-01 3.30e-01 7.21e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.068 0.169 - - 1.75e-02 1.73e-03 71.884 57
CPL 1.063 0.171 9999.1 5000.0 1.76e-02 1.73e-03 71.885 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.911 0.197 - - 2.25e-02 2.70e-03 65.088 57
CPL 0.488 0.779 220.0 5000.0 3.38e-02 3.11e-02 64.317 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 2.168 -0.116 2.052
T90 1.808 0.096 1.904
T50 0.876 0.408 1.284
Peak 1.000 0.156 1.156
Image
Pre-slew 15-350 keV image (Event data; bgd subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.8007 +32.2514 0.0114 40.4 36.0 0.5539 16.9 TRIG_00131185
------------------------------------------
Foreground time interval of the image:
139321469.964000 139321472.132000
Background time interval of the image:
139321171.000000 139321469.964000
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)
Flight mask-tagged light curves
Quad-rate summed light curves (from T0-300 to T0+1000)
Spectral Evolution
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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.116 sec. to 2.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06800 ( -0.172093 0.166792 )
Norm@50keV : 1.751203E-02 ( -1.730721E-03 1.721740E-03) )
------------------------------------------------------------
Chi-Squared = 71.88434 using 59 PHA bins.
Reduced chi-squared = 1.261129 for 57 degrees of freedom
Null hypothesis probability = 8.857E-02
Photon flux (15-150 keV) in 2.168 sec: 2.02548 ( -0.20774 0.20791 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01008e-07 ( -4.07411e-08 4.10186e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 2.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06265 ( -0.173392 0.167942 )
Epeak [keV] : 9999.11 ( -9999.10 0.891602 )
Norm@50keV : 1.761141E-02 ( -1.736265E-03 1.727965E-03) )
------------------------------------------------------------
Chi-Squared = 71.88469 using 59 PHA bins.
Reduced chi-squared = 1.283655 for 56 degrees of freedom
Null hypothesis probability = 7.488E-02
Photon flux (15-150 keV) in 2.168 sec: 2.02495 ( -0.20721 0.20815 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01327e-07 ( -4.09318e-08 4.08733e-08 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 2.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.146021 ( -9.85398 3.16018 )
beta : -1.25900 ( -0.449059 0.311375 )
Epeak [keV] : 91.1523 ( -91.0523 547.491 )
Norm@50keV : 5.312570E-02 ( -2.880695E-02 429.519 )
------------------------------------------------------------
Chi-Squared = 70.51884 using 59 PHA bins.
Reduced chi-squared = 1.282161 for 55 degrees of freedom
Null hypothesis probability = 7.752E-02
Photon flux (15-150 keV) in 2.168 sec: 1.97884 ( -0.21935 0.21786 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00939e-07 ( -4.07627e-08 4.09709e-08 ) ergs/cm2
Peak spectrum fit
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: 0.910522 ( -0.201905 0.192828 )
Norm@50keV : 2.249581E-02 ( -2.713488E-03 2.677856E-03) )
------------------------------------------------------------
Chi-Squared = 65.08798 using 59 PHA bins.
Reduced chi-squared = 1.141894 for 57 degrees of freedom
Null hypothesis probability = 0.216
Photon flux (15-150 keV) in 1.000 sec: 2.58225 ( -0.31058 0.31213 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51397e-07 ( -2.9453e-08 2.9602e-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: 0.487812 ( -0.976162 0.581589 )
Epeak [keV] : 219.987 ( -219.977 9780.01 )
Norm@50keV : 3.378007E-02 ( -1.345000E-02 4.876259E-02) )
------------------------------------------------------------
Chi-Squared = 64.31715 using 59 PHA bins.
Reduced chi-squared = 1.148521 for 56 degrees of freedom
Null hypothesis probability = 0.208
Photon flux (15-150 keV) in 1.000 sec: 2.54681 ( -0.31858 0.31845 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49346e-07 ( -3.0568e-08 3.0202e-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 : -0.797564 ( -9.20244 5.79756 )
beta : -0.910535 ( -0.192777 0.202075 )
Epeak [keV] : 30.8943 ( -679.900 9320.00 )
Norm@50keV : 3.473933E-02 ( -4.898604E-03 543.420 )
------------------------------------------------------------
Chi-Squared = 65.08797 using 59 PHA bins.
Reduced chi-squared = 1.183418 for 55 degrees of freedom
Null hypothesis probability = 0.166
Photon flux (15-150 keV) in 1.000 sec: 2.51053 ( -0.33224 0.3279 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49201e-07 ( -3.0555e-08 3.018e-08 ) ergs/cm2
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06800 ( -0.172093 0.166792 )
Norm@50keV : 1.751203E-02 ( -1.730721E-03 1.721740E-03) )
------------------------------------------------------------
Chi-Squared = 71.88434 using 59 PHA bins.
Reduced chi-squared = 1.261129 for 57 degrees of freedom
Null hypothesis probability = 8.857E-02
Photon flux (15-150 keV) in 2.168 sec: 2.02548 ( -0.20774 0.20791 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01008e-07 ( -4.07411e-08 4.10186e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06265 ( -0.173392 0.167942 )
Epeak [keV] : 9999.11 ( -9999.10 0.891602 )
Norm@50keV : 1.761141E-02 ( -1.736265E-03 1.727965E-03) )
------------------------------------------------------------
Chi-Squared = 71.88469 using 59 PHA bins.
Reduced chi-squared = 1.283655 for 56 degrees of freedom
Null hypothesis probability = 7.488E-02
Photon flux (15-150 keV) in 2.168 sec: 2.02495 ( -0.20721 0.20815 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01327e-07 ( -4.09318e-08 4.08733e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.146021 ( -9.85398 3.16018 )
beta : -1.25900 ( -0.449059 0.311375 )
Epeak [keV] : 91.1523 ( -91.0523 547.491 )
Norm@50keV : 5.312570E-02 ( -2.880695E-02 429.519 )
------------------------------------------------------------
Chi-Squared = 70.51884 using 59 PHA bins.
Reduced chi-squared = 1.282161 for 55 degrees of freedom
Null hypothesis probability = 7.752E-02
Photon flux (15-150 keV) in 2.168 sec: 1.97884 ( -0.21935 0.21786 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00939e-07 ( -4.07627e-08 4.09709e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.7723e-08
S(50-100 keV) = 1.48034e-07
T90 vs. Hardness ratio plot
T90 = 1.80799999833107 sec.
Hardness ratio = 1.90464
Color vs. Color plot
Count ratio (25-50 keV) / (15-25 keV) = 1.95289
Count ratio (100-50 keV) / (15-25 keV) = 1.8254
DPI of the refined source position
IMX = 6.893222455400874E-01, IMY = -5.008113474197105E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image is from -299.080 sec. to -0.116 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.4576 +35.3425 0.0000 32.5 87.5 -0.5095 -1.1 Her X-1
299.5903 +35.2016 0.0000 40.4 25.1 0.3862 1.0 Cyg X-1
308.1103 +40.9526 0.0000 38.1 11.6 -0.0967 -0.3 Cyg X-3
326.1717 +38.3217 0.0000 47.1 -4.6 -0.2591 -0.6 Cyg X-2
142.3692 +47.1374 0.0813 55.2 -145.3 3.7398 2.4 UNKNOWN
175.8836 +32.4520 0.0630 57.0 179.2 4.3871 3.1 UNKNOWN
298.3134 +34.9770 0.0313 40.2 26.7 2.3910 6.2 UNKNOWN
------------------------------------------
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image is from -0.116 sec. to 2.052 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.4576 +35.3425 0.0000 32.4 87.9 0.0043 0.2 Her X-1
299.5903 +35.2016 0.0000 40.0 25.0 -0.0212 -0.8 Cyg X-1
308.1103 +40.9526 0.0000 37.7 11.4 -0.0030 -0.1 Cyg X-3
326.1717 +38.3217 0.0000 46.7 -4.9 0.0130 0.4 Cyg X-2
141.4226 +71.6672 0.0319 34.5 -127.5 0.1147 6.0 UNKNOWN
291.8007 +32.2514 0.0114 40.4 36.0 0.5539 16.9 UNKNOWN
337.2675 +36.5440 0.0318 52.5 -14.0 0.2081 6.0 UNKNOWN
------------------------------------------
Post-slew image of 15-350 keV band
Time interval of the image is from -299.080 sec. to 33.020 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.4576 +35.3425 0.0000 32.4 87.6 -0.4185 -0.8 Her X-1
299.5903 +35.2016 0.0000 40.3 25.1 -0.2156 -0.5 Cyg X-1
308.1103 +40.9526 0.0000 38.0 11.5 -0.1130 -0.4 Cyg X-3
326.1717 +38.3217 0.0000 47.1 -4.6 -0.7207 -1.6 Cyg X-2
161.3811 +36.2186 0.0761 59.0 -166.2 5.3811 2.5 UNKNOWN
175.9024 +32.5416 0.0647 57.0 179.2 4.7366 3.0 UNKNOWN
246.8120 +37.7397 0.0468 30.6 99.7 1.5564 4.1 UNKNOWN
298.3952 +34.9144 0.0290 40.2 26.6 2.6860 6.6 UNKNOWN
------------------------------------------