batgrbproduct Analysis for Trigger=687522
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): Thu May 26 13:12:39 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger687522/GCN5_download_cron
======================================================================
Trigger: 00687522 Segment: 000
BAT Trigger Time: 485861123.968 [s; MET]
Trigger Stop: 485861124.48 [s; MET]
UTC: 2016-05-25T09:25:07.649260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 149.442925515661 Dec: 51.1802165201058 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.55
Image Trigger?: NO
Rate S/N Ratio: 11.3578166916005 [ if not an image trigger ]
Image S/N Ratio: 6.55
Flight Position: [ source = BAT ]
RA: 149.442925515661 Dec: 51.1802165201058 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 149.438837636393 Dec: 51.1970242658892 [deg; J2000]
{ 09h 57m 45.3s , +51d 11' 49.3" }
+/- 2.19533239268675 [arcmin] (estimated 90% radius based on SNR)
+/- 1.17738534425654 [arcmin] (formal 1-sigma fit error)
SNR: 9.89146979537961
Angular difference between Flight and Ground position is 1.020114 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 0.291999936103821 +/- 0.0456069787374054
Measured from: 0.0280001163482666
to: 0.320000052452087 [s; relative to TRIGTIME]
T50: 0.171999990940094 +/- 0.065115289853844
Measured from: 0.080000102519989
to: 0.252000093460083 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.324000000953674
to: 0.675999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0160000324249268
to: 0.332000017166138 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.023278 0.022391 0.016070 0.011759
0.004327 0.004319 0.003737 0.002997 [error]
Peak 0.033062 0.037371 0.033154 0.014749
0.006811 0.007418 0.006308 0.005262 [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 6.29e-09 9.15e-09 9.92e-09 2.01e-08 3.15e-08 4.54e-08 erg/cm2
Error 1.78e-09 1.90e-09 3.19e-09 1.27e-08 7.66e-09 1.63e-08 erg/cm2
Peak flux Power-law 2.84e-01 2.95e-01 2.17e-01 2.57e-01 8.95e-01 1.05e+00 ph/cm2/s
Error 9.19e-02 5.95e-02 5.08e-02 1.25e-01 1.70e-01 2.00e-01 ph/cm2/s
Fluence Cutoff-PL 5.70e-09 1.08e-08 9.54e-09 3.41e-09 2.86e-08 2.95e-08 erg/cm2
Error 2.02e-09 2.77e-09 4.03e-09 8.70e-09 7.88e-09 1.60e-08 erg/cm2
Peak flux Cutoff-PL 2.85e-01 2.96e-01 2.17e-01 2.54e-01 8.96e-01 1.05e+00 ph/cm2/s
Error 7.37e-02 6.46e-02 5.35e-02 1.70e-01 1.69e-01 2.35e-01 ph/cm2/s
Fluence Band 5.65e-09 1.08e-08 9.49e-09 4.51e-09 2.86e-08 3.09e-08 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.884 0.350 - - 1.09e-02 2.65e-03 47.300 57
CPL 0.600 1.834 45.7 -14.1 6.02e-02 5.83e-01 45.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.443 0.325 - - 7.28e-03 1.38e-03 49.670 57
CPL 1.440 1.527 10000.0 0.0 7.30e-03 -2.96e-03 49.680 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: 0.640000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.316 0.016 0.332
T90 0.292 0.028 0.320
T50 0.172 0.080 0.252
Peak 1.000 -0.324 0.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
149.4388 +51.1970 0.0194 27.8 172.7 0.0776 9.9 TRIG_00687522
------------------------------------------
Foreground time interval of the image:
0.016 0.332 (delta_t = 0.316 [sec])
Background time interval of the image:
-239.968 0.016 (delta_t = 239.984 [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 0.016 sec. to 0.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88424 ( -0.335731 0.364053 )
Norm@50keV : 1.08590E-02 ( -0.00269415 0.00261106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.30 using 59 PHA bins.
# Reduced chi-squared = 0.8298 for 57 degrees of freedom
# Null hypothesis probability = 8.166604e-01
Photon flux (15-150 keV) in 0.316 sec: 1.54805 ( -0.320938 0.321029 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15459e-08 ( -7.54567e-09 7.77445e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.599738 ( -2.1897 1.47877 )
Epeak [keV] : 45.7368 ( -17.5996 -45.7345 )
Norm@50keV : 6.01551E-02 ( -0.0601979 1.10671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.20 using 59 PHA bins.
# Reduced chi-squared = 0.8071 for 56 degrees of freedom
# Null hypothesis probability = 8.486407e-01
Photon flux (15-150 keV) in 0.316 sec: 1.50767 ( -0.32362 0.32428 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86122e-08 ( -7.40056e-09 8.35668e-09 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 0.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.523549 ( -0.690879 -0.690879 )
beta : -4.47458 ( 4.3006 5.90822 )
Epeak [keV] : 45.6652 ( -45.6643 156.599 )
Norm@50keV : 6.62978E-02 ( -0.0661015 1077.73 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.20 using 59 PHA bins.
# Reduced chi-squared = 0.8217 for 55 degrees of freedom
# Null hypothesis probability = 8.244343e-01
Photon flux (15-150 keV) in 0.316 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86364e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7831 (-2.22212 2.79745)
R^2/D10^2 : 0.579633 (-0.340379 0.801117)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.90 using 59 PHA bins.
# Reduced chi-squared = 0.8404 for 57 degrees of freedom
# Null hypothesis probability = 7.992475e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.431e-09 1.851e-09
25- 50 1.221e-08 4.110e-09
50-150 7.895e-09 3.900e-09
15-150 2.454e-08 9.166e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.7897 (-33.929 98.4841)
Norm : 7.52331 (-2.15798 2.71448)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8020 for 57 degrees of freedom
# Null hypothesis probability = 8.582550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.151e-09 1.871e-09
25- 50 1.002e-08 3.433e-09
50-150 1.376e-08 1.062e-08
15-150 2.994e-08 1.109e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.72150 (-4.18313 -5.7215)
R1^2/D10^2 : 3.32009 (-3.16158 1748.46)
kT2 [keV] : 15.8493 (-14.3056 -15.8493)
R2^2/D10^2 : 9.79899E-02 (-0.0979756 0.582368)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8178 for 55 degrees of freedom
# Null hypothesis probability = 8.303856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.860e-09 3.433e-09
25- 50 1.054e-08 5.393e-09
50-150 1.205e-08 7.401e-09
15-150 2.845e-08 1.457e-08
Peak spectrum fit
Power-law model
Time interval is from -0.324 sec. to 0.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44311 ( -0.325205 0.325785 )
Norm@50keV : 7.27775E-03 ( -0.00138192 0.00137013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.67 using 59 PHA bins.
# Reduced chi-squared = 0.8715 for 57 degrees of freedom
# Null hypothesis probability = 7.436883e-01
Photon flux (15-150 keV) in 1 sec: 0.895359 ( -0.169381 0.169726 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.97318e-08 ( -1.44713e-08 1.46648e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.324 sec. to 0.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44039 ( -1.28159 1.77164 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.30217E-03 ( -0.00139053 -0.00730227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.8871 for 56 degrees of freedom
# Null hypothesis probability = 7.116072e-01
Photon flux (15-150 keV) in 1 sec: 0.895670 ( -0.170354 0.16851 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.94204e-08 ( -1.4949e-08 1.49532e-08 ) ergs/cm2
Band function
Time interval is from -0.324 sec. to 0.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.71343 ( -4.71343 -4.71343 )
beta : -1.48216 ( -0.367742 0.343506 )
Epeak [keV] : 21.9052 ( -21.9052 25.782 )
Norm@50keV : 984.271 ( -181.85 4.4117e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8997 for 55 degrees of freedom
# Null hypothesis probability = 6.845573e-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] : 15.5139 (-3.7441 5.18582)
R^2/D10^2 : 9.03929E-02 (-0.0564385 0.146339)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.029313e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.528e-09 1.686e-09
25- 50 1.855e-08 5.880e-09
50-150 3.082e-08 1.199e-08
15-150 5.389e-08 1.779e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-94.6915 -199.363)
Norm : 3.68723 (-0.684039 0.685245)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.24 using 59 PHA bins.
# Reduced chi-squared = 0.8815 for 57 degrees of freedom
# Null hypothesis probability = 7.246061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.182e-09 5.405e-09
25- 50 1.766e-08 1.017e-08
50-150 3.874e-08 2.194e-08
15-150 6.558e-08 3.711e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.10727 (-3.49921 5.5289)
R1^2/D10^2 : 0.929676 (-0.761248 11.2664)
kT2 [keV] : 30.6430 (-12.8011 -30.7378)
R2^2/D10^2 : 7.12934E-03 (-0.0069729 0.017643)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
# Reduced chi-squared = 0.9068 for 55 degrees of freedom
# Null hypothesis probability = 6.702541e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.696e-09 5.105e-09
25- 50 1.724e-08 9.225e-09
50-150 4.419e-08 2.611e-08
15-150 7.012e-08 3.658e-08
Plot creation:
Thu May 26 13:17:26 EDT 2016