batgrbproduct Analysis for Trigger=555880
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): Wed May 15 05:21:55 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger555880/GCN5_download_cron
======================================================================
Trigger: 00555880 Segment: 000
BAT Trigger Time: 390273688.396 [s; MET]
Trigger Stop: 390273688.46 [s; MET]
UTC: 2013-05-15T01:21:17.839880 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 283.421862578053 Dec: -54.2810228525545 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 60.390396587537 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 283.421862578053 Dec: -54.2810228525545 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.435861649432 Dec: -54.2823074144354 [deg; J2000]
{ 18h 53m 44.6s , -54d 16' 56.3" }
+/- 1.58126719100387 [arcmin] (estimated 90% radius based on SNR)
+/- 0.675248044091739 [arcmin] (formal 1-sigma fit error)
SNR: 15.8061155076958
Angular difference between Flight and Ground position is 0.496381 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 0.295999944210052 +/- 0.0609261752673085
Measured from: -0.0159999132156372
to: 0.280000030994415 [s; relative to TRIGTIME]
T50: 0.151999950408936 +/- 0.0526117745496101
Measured from: 0.0200001001358032
to: 0.172000050544739 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.350000023841858
to: 0.649999976158142 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 0.331999957561493 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.029848 0.053753 0.083289 0.024494
0.005169 0.006484 0.006709 0.005639 [error]
Peak 0.027832 0.056153 0.080502 0.022282
0.007448 0.008579 0.008335 0.007197 [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 8.22e-09 2.37e-08 5.56e-08 3.56e-07 1.50e-07 4.44e-07 erg/cm2
Error 1.82e-09 3.11e-09 6.18e-09 9.38e-08 1.71e-08 9.66e-08 erg/cm2
Peak flux Power-law 2.87e-01 4.16e-01 4.49e-01 9.03e-01 1.43e+00 2.05e+00 ph/cm2/s
Error 8.23e-02 7.30e-02 6.50e-02 2.85e-01 1.99e-01 3.20e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 2.06e-01 4.25e-01 5.06e-01 3.98e-01 1.37e+00 1.53e+00 ph/cm2/s
Error 1.12e-01 8.46e-02 9.06e-02 2.50e-01 2.14e-01 4.53e-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 0.769 0.184 - - 3.45e-02 3.65e-03 60.930 57
CPL 0.330 0.733 233.6 0.0 5.25e-02 0.00e+00 59.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.891 0.237 - - 1.25e-02 1.73e-03 58.350 57
CPL -0.190 1.359 122.5 -41.7 3.51e-02 7.25e-02 55.700 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: 0.320000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.368 -0.036 0.332
T90 0.296 -0.016 0.280
T50 0.152 0.020 0.172
Peak 1.000 -0.350 0.650
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.4359 -54.2823 0.0121 24.2 141.4 0.1967 15.8 TRIG_00555880
------------------------------------------
Foreground time interval of the image:
-0.036 0.332 (delta_t = 0.368 [sec])
Background time interval of the image:
-119.396 -0.036 (delta_t = 119.360 [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 -0.036 sec. to 0.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.769220 ( -0.1865 0.180671 )
Norm@50keV : 3.45006E-02 ( -0.0036672 0.00363839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.364082e-01
Photon flux (15-150 keV) in 0.368 sec: 3.97035 ( -0.411733 0.412184 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5032e-07 ( -1.70271e-08 1.71219e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.329888 ( -0.904212 0.561938 )
Epeak [keV] : 233.646 ( -233.565 -233.565 )
Norm@50keV : 5.24516E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.95 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 56 degrees of freedom
# Null hypothesis probability = 3.346181e-01
Photon flux (15-150 keV) in 0.368 sec: 3.90895 ( -0.42795 0.4258 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.982041 ( 0.982041 0.982041 )
beta : -0.769224 ( -0.180531 0.186706 )
Epeak [keV] : 17.4158 ( -17.4158 -17.4158 )
Norm@50keV : 4.59744E-02 ( -0.015074 805355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.710830e-01
Photon flux (15-150 keV) in 0.368 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] : 26.2860 (-3.4603 4.35002)
R^2/D10^2 : 8.87706E-02 (-0.0316921 0.0458453)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.02 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.711070e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.816e-09 7.642e-10
25- 50 2.219e-08 3.809e-09
50-150 1.127e-07 1.903e-08
15-150 1.387e-07 2.212e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 14.8527 (-1.67177 1.67173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.56 using 59 PHA bins.
# Reduced chi-squared = 1.8870 for 57 degrees of freedom
# Null hypothesis probability = 5.929574e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.361e-08 7.518e-09
25- 50 2.618e-08 1.452e-08
50-150 5.743e-08 3.150e-08
15-150 9.722e-08 5.402e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.93012 (-1.76721 3.78899)
R1^2/D10^2 : 18.3724 (-17.2152 525.957)
kT2 [keV] : 29.7150 (-4.59257 7.00888)
R2^2/D10^2 : 5.97421E-02 (-0.0277316 0.0414349)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.131861e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.697e-09 3.819e-09
25- 50 2.071e-08 4.869e-09
50-150 1.175e-07 2.633e-08
15-150 1.469e-07 3.108e-08
Peak spectrum fit
Power-law model
Time interval is from -0.350 sec. to 0.650 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.890523 ( -0.241686 0.232726 )
Norm@50keV : 1.24661E-02 ( -0.00173896 0.0017272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.35 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.255762e-01
Photon flux (15-150 keV) in 1 sec: 1.43071 ( -0.198755 0.199359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40421e-07 ( -2.07361e-08 2.08834e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.350 sec. to 0.650 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.189525 ( -1.63285 1.08554 )
Epeak [keV] : 122.458 ( -38.8688 -122.341 )
Norm@50keV : 3.50865E-02 ( -0.0351779 0.109756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 0.9947 for 56 degrees of freedom
# Null hypothesis probability = 4.860857e-01
Photon flux (15-150 keV) in 1 sec: 1.36592 ( -0.21568 0.21236 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34654e-07 ( -2.2379e-08 2.2243e-08 ) ergs/cm2
Band function
Time interval is from -0.350 sec. to 0.650 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.861056 ( 0.861164 0.861164 )
beta : -0.890636 ( -0.232738 0.241469 )
Epeak [keV] : 14.1779 ( )
Norm@50keV : 1.84972E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.35 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.533560e-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] : 23.5839 (-3.55247 4.62915)
R^2/D10^2 : 4.35483E-02 (-0.01834 0.0287262)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.747242e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.336e-09 1.164e-09
25- 50 2.385e-08 5.135e-09
50-150 9.898e-08 2.185e-08
15-150 1.272e-07 2.695e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.64976 (-0.822667 0.822649)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.45 using 59 PHA bins.
# Reduced chi-squared = 1.376 for 57 degrees of freedom
# Null hypothesis probability = 3.131332e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.406e-08 7.990e-09
25- 50 2.705e-08 1.509e-08
50-150 5.933e-08 3.349e-08
15-150 1.005e-07 5.670e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.14885 (-2.41534 6.15816)
R1^2/D10^2 : 18.6613 (-18.531 388)
kT2 [keV] : 25.2879 (-4.22532 5.14375)
R2^2/D10^2 : 3.41967E-02 (-0.0174513 0.0233061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 55 degrees of freedom
# Null hypothesis probability = 5.473878e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.459e-09 3.929e-09
25- 50 2.235e-08 6.710e-09
50-150 1.020e-07 2.804e-08
15-150 1.328e-07 3.499e-08
Plot creation:
Tue May 21 16:02:02 EDT 2013