batgrbproduct Analysis for Trigger=526660
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Jul 15 22:22:45 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger526660/GCN5_download_cron
======================================================================
Trigger: 00526660 Segment: 000
BAT Trigger Time: 364019478.008 [s; MET]
Trigger Stop: 364019478.016 [s; MET]
UTC: 2012-07-15T04:31:08.580840 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.349573941703 Dec: -4.95792801754117 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 25.1793566240283 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 280.349573941703 Dec: -4.95792801754117 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.374277749728 Dec: -4.9231688957825 [deg; J2000]
{ 18h 41m 29.8s , -04d 55' 23.4" }
+/- 2.50317110772759 [arcmin] (estimated 90% radius based on SNR)
+/- 1.39654444200054 [arcmin] (formal 1-sigma fit error)
SNR: 8.20061047607974
Angular difference between Flight and Ground position is 2.555428 arcmin
Partial Coding Fraction: 0.4492188 [ including projection effects ]
Duration
T90: 0.0119999647140503 +/- 0.012649079728912
Measured from: -0.00799989700317383
to: 0.00400006771087646 [s; relative to TRIGTIME]
T50: 0.00399994850158691 +/- 0.00400000810623169
Measured from: -0.00399988889694214
to: 5.96046447753906e-08 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.495999991893768
to: 0.504000008106232 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 0.0119999647140503 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.015015 0.018186 0.005084 -0.000793
0.002758 0.002941 0.002015 0.000906 [error]
Peak 0.010571 0.017221 0.001399 0.012722
0.010336 0.009323 0.008084 0.006884 [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 4.36e-09 4.00e-09 2.54e-09 2.47e-09 1.19e-08 1.34e-08 erg/cm2
Error 1.13e-09 1.07e-09 1.15e-09 1.95e-09 3.25e-09 4.25e-09 erg/cm2
Peak flux Power-law 9.00e-02 9.38e-02 6.91e-02 8.20e-02 2.85e-01 3.35e-01 ph/cm2/s
Error 1.16e-01 8.63e-02 6.16e-02 4.71e-01 2.26e-01 3.61e-01 ph/cm2/s
Fluence Cutoff-PL 3.75e-09 6.56e-09 2.52e-09 1.05e-10 1.29e-08 0.00e+00 erg/cm2
Error 1.37e-09 1.87e-09 1.56e-09 3.25e-10 3.13e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.94e-02 9.45e-02 6.94e-02 7.57e-02 2.84e-01 3.25e-01 ph/cm2/s
Error 8.04e-02 1.06e-01 7.17e-02 1.47e-01 2.26e-01 2.96e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 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 2.660 0.403 - - 5.68e-02 2.02e-02 50.050 57
CPL -0.617 2.448 32.2 9.9 5.39e+00 1.68e+02 40.610 56
The chi2 of BB fit is 40.81 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.441 2.088 - - 2.31e-03 2.05e-03 43.790 57
CPL 1.391 4.278 536.1 0.0 2.47e-03 0.00e+00 43.790 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.020 -0.008 0.012
T90 0.012 -0.008 0.004
T50 0.004 -0.004 0.000
Peak 1.000 -0.496 0.504
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3743 -4.9232 0.0235 27.5 62.2 0.0388 8.2 TRIG_00526660
------------------------------------------
Foreground time interval of the image:
-0.008 0.012 (delta_t = 0.020 [sec])
Background time interval of the image:
-119.008 -0.008 (delta_t = 119.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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.
- 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 -0.008 sec. to 0.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65959 ( -0.356096 0.44954 )
Norm@50keV : 5.68363E-02 ( -0.0202114 0.0200948 )
------------------------------------------------------------
# Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.8780 for 57 degrees of freedom
# Null hypothesis probability = 7.312727e-01
Photon flux (15-150 keV) in 0.02 sec: 12.3534 ( -2.92058 2.92168 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.194e-08 ( -3.20262e-09 3.29578e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.616985 ( -2.92156 1.97402 )
Epeak [keV] : 32.2061 ( -12.4492 7.42396 )
Norm@50keV : 5.39364 ( -6.54188 330.117 )
------------------------------------------------------------
# Chi-Squared = 40.61 using 59 PHA bins.
# Reduced chi-squared = 0.7252 for 56 degrees of freedom
# Null hypothesis probability = 9.393406e-01
Photon flux (15-150 keV) in 0.02 sec: 13.2232 ( -2.9336 2.9347 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29397e-08 ( -3.09092e-09 3.17832e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.883230 ( -2.9397 2.39508 )
beta : -9.99966 ( 9476.5 9486.5 )
Epeak [keV] : 32.7560 ( -12.4486 7.38622 )
Norm@50keV : 7.70763 ( -6.55935 325.516 )
------------------------------------------------------------
# Chi-Squared = 40.61 using 59 PHA bins.
# Reduced chi-squared = 0.7383 for 55 degrees of freedom
# Null hypothesis probability = 9.263610e-01
Photon flux (15-150 keV) in 0.02 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.76643 (-1.66937 1.67157)
R^2/D10^2 : 11.5724 (-5.92576 14.5118)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 40.81 using 59 PHA bins.
# Reduced chi-squared = 0.7159 for 57 degrees of freedom
# Null hypothesis probability = 9.480180e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.414e-09 1.353e-09
25- 50 6.961e-09 2.520e-09
50-150 2.449e-09 1.403e-09
15-150 1.282e-08 4.886e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.0526 (-9.76712 13.8908)
Norm : 106.668 (-33.7654 49.9495)
------------------------------------------------------------
# Chi-Squared = 43.68 using 59 PHA bins.
# Reduced chi-squared = 0.7663 for 57 degrees of freedom
# Null hypothesis probability = 9.027085e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.417e-09 1.249e-09
25- 50 5.143e-09 1.673e-09
50-150 2.946e-09 1.918e-09
15-150 1.251e-08 4.123e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.12557 (-3.26424 31.7036)
R1^2/D10^2 : 239.132 (-207.32 -207.32)
kT2 [keV] : 9.47965 (-2.07166 -9.52114)
R2^2/D10^2 : 7.61612 (-7.43891 14.2012)
------------------------------------------------------------
# Chi-Squared = 39.79 using 59 PHA bins.
# Reduced chi-squared = 0.7234 for 55 degrees of freedom
# Null hypothesis probability = 9.389565e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.880e-09 2.109e-09
25- 50 6.476e-09 3.865e-09
50-150 2.804e-09 1.952e-09
15-150 1.316e-08 7.450e-09
Peak spectrum fit
Power-law model
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44123 ( -2.41464 1.76088 )
Norm@50keV : 2.31434E-03 ( -0.00231434 0.00178119 )
------------------------------------------------------------
# Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7683 for 57 degrees of freedom
# Null hypothesis probability = 9.004448e-01
Photon flux (15-150 keV) in 1 sec: 0.284598 ( -0.222942 0.229508 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21824e-08 ( -1.75897e-08 1.88823e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39051 ( -0.959475 7.59746 )
Epeak [keV] : 536.080 ( )
Norm@50keV : 2.46971E-03 ( -0.00248672 -0.00248672 )
------------------------------------------------------------
# Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7820 for 56 degrees of freedom
# Null hypothesis probability = 8.821069e-01
Photon flux (15-150 keV) in 1 sec: 0.284120 ( -0.222681 0.229665 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83976e-08 ( -3.83976e-08 8.21934e-08 ) ergs/cm2
Band function
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99987 ( -14999.4 -14999.4 )
beta : -1.84470 ( 1.86791 1.86791 )
Epeak [keV] : 29.1228 ( -28.5853 70.3729 )
Norm@50keV : 109.335 ( -125.878 5.7826e+06 )
------------------------------------------------------------
# Chi-Squared = 43.31 using 59 PHA bins.
# Reduced chi-squared = 0.7874 for 55 degrees of freedom
# Null hypothesis probability = 8.730077e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2746 (-8.15559 -12.3223)
R^2/D10^2 : 6.50256E-02 (-0.0636924 3.71895)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 44.22 using 59 PHA bins.
# Reduced chi-squared = 0.7758 for 57 degrees of freedom
# Null hypothesis probability = 8.919126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.075e-09 1.512e-09
25- 50 6.705e-09 5.220e-09
50-150 6.165e-09 5.565e-09
15-150 1.495e-08 1.204e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.954 -199.954)
Norm : 1.17780 (-0.904012 0.96672)
------------------------------------------------------------
# Chi-Squared = 43.81 using 59 PHA bins.
# Reduced chi-squared = 0.7685 for 57 degrees of freedom
# Null hypothesis probability = 9.001789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.933e-09 2.229e-09
25- 50 5.642e-09 4.083e-09
50-150 1.237e-08 8.865e-09
15-150 2.095e-08 1.576e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 94.6919 ( )
R1^2/D10^2 : 1.29216E-04 (-0.000129552 -0.000129552)
kT2 [keV] : 8.75058 (-8.75532 85.2625)
R2^2/D10^2 : 0.191271 (-0.190621 -0.190621)
------------------------------------------------------------
# Chi-Squared = 43.49 using 59 PHA bins.
# Chi-Squared = 43.43 using 59 PHA bins.
# Reduced chi-squared = 0.7907 for 55 degrees of freedom
# Reduced chi-squared = 0.7897 for 55 degrees of freedom
# Null hypothesis probability = 8.686746e-01
# Null hypothesis probability = 8.700027e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.044e-09 2.490e-09
25- 50 6.056e-09 4.490e-09
50-150 1.363e-08 9.825e-09
15-150 2.273e-08 1.474e-08
Plot creation:
Sun Jul 15 22:32:57 EDT 2012