batgrbproduct Analysis for Trigger=557828
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): Mon Jun 10 20:43:06 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger557828/batgroup_hand_proc
======================================================================
Trigger: 00557828 Segment: 000
BAT Trigger Time: 392506731.072 [s; MET]
Trigger Stop: 392506732.096 [s; MET]
UTC: 2013-06-09T21:38:40.416520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 53.7539682175759 Dec: -40.1534346904126 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.03
Image Trigger?: NO
Rate S/N Ratio: 44.4747119158742 [ if not an image trigger ]
Image S/N Ratio: 11.03
Flight Position: [ source = BAT ]
RA: 53.7539682175759 Dec: -40.1534346904126 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 53.7756433191991 Dec: -40.1693721682409 [deg; J2000]
{ 03h 35m 06.2s , -40d 10' 09.7" }
+/- 0.719004327649441 [arcmin] (estimated 90% radius based on SNR)
+/- 0.22895014360323 [arcmin] (formal 1-sigma fit error)
SNR: 48.7290179979518
Angular difference between Flight and Ground position is 1.379211 arcmin
Partial Coding Fraction: 0.4375 [ including projection effects ]
Duration
T90: 210.627999961376 +/- 15.0713763059169
Measured from: 0.223999977111816
to: 210.851999938488 [s; relative to TRIGTIME]
T50: 76.0999999642372 +/- 33.9616221978202
Measured from: 7.96399998664856
to: 84.0639999508858 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.7239999771118
to: 17.7239999771118 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.83600002527237
to: 307.587999999523 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.981087 8.212970 7.638965 2.255136
0.121316 0.126676 0.120334 0.105675 [error]
Peak 0.207316 0.345669 0.408283 0.126563
0.013664 0.016774 0.018056 0.013454 [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 1.77e-06 3.63e-06 5.80e-06 2.06e-05 1.61e-05 3.18e-05 erg/cm2
Error 7.93e-08 9.28e-08 1.32e-07 1.14e-06 3.32e-07 1.18e-06 erg/cm2
Peak flux Power-law 1.95e+00 2.60e+00 2.54e+00 4.45e+00 8.55e+00 1.15e+01 ph/cm2/s
Error 1.93e-01 1.56e-01 1.40e-01 5.27e-01 4.30e-01 6.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.71e-06 3.64e-06 5.87e-06 1.78e-05 1.60e-05 2.90e-05 erg/cm2
Error 8.14e-08 9.49e-08 1.20e-07 3.07e-06 3.60e-07 3.93e-06 erg/cm2
Peak flux Cutoff-PL 1.78e+00 2.65e+00 2.66e+00 3.18e+00 8.44e+00 1.03e+01 ph/cm2/s
Error 2.50e-01 1.68e-01 1.80e-01 1.25e+00 4.42e-01 1.14e+00 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 1.324 0.039 - - 5.19e-03 1.05e-04 55.590 57
CPL 1.200 0.139 387.3 0.0 5.85e-03 0.00e+00 53.840 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.033 0.086 - - 7.41e-02 3.66e-03 60.580 57
CPL 0.683 0.352 219.3 1456.5 1.06e-01 3.72e-02 57.540 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: 187.904000 sec.
T50 in the 50-300 keV band: 15.872000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 315.424 -7.836 307.588
T90 210.628 0.224 210.852
T50 76.100 7.964 84.064
Peak 1.000 16.724 17.724
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
53.7756 -40.1694 0.0039 32.0511 -69.4897 8.2270228 48.729 TRIG_00557828
Foreground time interval of the image:
-7.836 12.029 (delta_t = 19.865 [sec])
Background time interval of the image:
-239.072 -7.836 (delta_t = 231.236 [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 -7.836 sec. to 307.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32381 ( -0.0391095 0.039035 )
Norm@50keV : 5.18921E-03 ( -0.000104904 0.000104786 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9753 for 57 degrees of freedom
# Null hypothesis probability = 5.280699e-01
Photon flux (15-150 keV) in 315.4 sec: 0.621880 ( -0.0141623 0.0142359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60815e-05 ( -3.31804e-07 3.32056e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.836 sec. to 307.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20021 ( -0.163776 0.11336 )
Epeak [keV] : 387.323 ( )
Norm@50keV : 5.84558E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 56 degrees of freedom
# Null hypothesis probability = 5.568922e-01
Photon flux (15-150 keV) in 315.4 sec: 0.615409 ( -0.01617 0.016186 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59828e-05 ( -3.6066e-07 3.58799e-07 ) ergs/cm2
Band function
Time interval is from -7.836 sec. to 307.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03945 ( 1.0402 1.0402 )
beta : -1.32379 ( -0.0390427 0.0390979 )
Epeak [keV] : 46.5689 ( )
Norm@50keV : 9.94697E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.523328e-01
Photon flux (15-150 keV) in 315.4 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] : 19.8135 ( )
R^2/D10^2 : 2.76144E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 481.99 using 59 PHA bins.
# Reduced chi-squared = 8.4559 for 57 degrees of freedom
# Null hypothesis probability = 1.370080e-68
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.616e-07 2.618e-08
25- 50 3.275e-06 9.777e-08
50-150 9.518e-06 3.217e-07
15-150 1.345e-05 2.886e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.65197 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 192.56 using 59 PHA bins.
# Reduced chi-squared = 3.3783 for 57 degrees of freedom
# Null hypothesis probability = 1.311093e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.083e-06 5.141e-08
25- 50 4.007e-06 9.620e-08
50-150 8.787e-06 1.861e-07
15-150 1.488e-05 3.501e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.58068 (-0.738803 0.795025)
R1^2/D10^2 : 0.406833 (-0.11645 0.181485)
kT2 [keV] : 29.9689 (-2.05794 2.56586)
R2^2/D10^2 : 5.89840E-03 (-0.00146077 0.00168212)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.14 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.097845e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.539e-06 1.236e-07
25- 50 3.644e-06 1.735e-07
50-150 1.068e-05 4.494e-07
15-150 1.586e-05 6.040e-07
Peak spectrum fit
Power-law model
Time interval is from 16.724 sec. to 17.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03288 ( -0.0857819 0.0854257 )
Norm@50keV : 7.41407E-02 ( -0.00366056 0.00365767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.481098e-01
Photon flux (15-150 keV) in 1 sec: 8.55257 ( -0.429568 0.429582 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92599e-07 ( -4.34938e-08 4.37363e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.724 sec. to 17.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.682913 ( -0.372168 0.331639 )
Epeak [keV] : 219.279 ( -83.7142 2829.22 )
Norm@50keV : 0.105852 ( -0.0275784 0.0469086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.54 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 56 degrees of freedom
# Null hypothesis probability = 4.178406e-01
Photon flux (15-150 keV) in 1 sec: 8.44312 ( -0.44221 0.44218 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.82833e-07 ( -4.5474e-08 4.5244e-08 ) ergs/cm2
Band function
Time interval is from 16.724 sec. to 17.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.874666 ( 0.874666 0.874666 )
beta : -1.03289 ( -0.0854206 0.0858158 )
Epeak [keV] : 47.4855 ( )
Norm@50keV : 0.119434 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.816764e-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] : 21.5706 (-1.37866 1.50823)
R^2/D10^2 : 0.329024 (-0.0629204 0.076121)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.92 using 59 PHA bins.
# Reduced chi-squared = 1.9986 for 57 degrees of freedom
# Null hypothesis probability = 1.138419e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.859e-08 2.905e-09
25- 50 1.494e-07 1.005e-08
50-150 5.189e-07 4.020e-08
15-150 6.969e-07 4.485e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 34.3853 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 155.88 using 59 PHA bins.
# Reduced chi-squared = 2.7347 for 57 degrees of freedom
# Null hypothesis probability = 3.984915e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.562e-08 4.570e-09
25- 50 1.647e-07 1.005e-08
50-150 3.612e-07 2.645e-08
15-150 6.116e-07 5.965e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.46511 (-2.57676 3.40222)
R1^2/D10^2 : 4.31644 (-2.74242 15.1088)
kT2 [keV] : 30.3925 (-4.84993 10.315)
R2^2/D10^2 : 9.77547E-02 (-0.0603388 0.0796012)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.36 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.586042e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.513e-08 1.667e-08
25- 50 1.505e-07 2.325e-08
50-150 5.773e-07 9.105e-08
15-150 7.829e-07 1.172e-07
Plot creation:
Mon Jun 10 21:05:35 EDT 2013