batgrbproduct analysis for trigger=1340561
batgrbproduct Analysis for Trigger=1340561
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Tue Aug 12 10:01:30 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1340561/batgroup_hand_proc
======================================================================
Trigger: 01340561 Segment: 000
BAT Trigger Time: 776274224 [s; MET]
Trigger Stop: 776274288 [s; MET]
UTC: 2025-08-07T15:43:07.895760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 15.5855603604508 Dec: -59.0940917581662 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.22
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.22
Flight Position: [ source = BAT ]
RA: 15.5855603604508 Dec: -59.0940917581662 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 15.6110572340659 Dec: -59.0978236453751 [deg; J2000]
{ 01h 02m 26.7s , -59d 05' 52.2" }
+/- 1.96002795489025 [arcmin] (estimated 90% radius based on SNR)
+/- 0.634243683721741 [arcmin] (formal 1-sigma fit error)
SNR: 11.6305662057235
Angular difference between Flight and Ground position is 0.816997 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 104.171999931335 +/- 29.16677469738
Measured from: -48.460000038147
to: 55.7119998931885 [s; relative to TRIGTIME]
T50: 53.1599999666214 +/- 4.98068113584914
Measured from: -37.6920000314713
to: 15.4679999351501 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -48.5920000076294
to: -47.5920000076294 [s; relative to TRIGTIME]
Total Fluence
Measured from: -50.9960000514984
to: 85.1560000181198 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.398287 1.563239 1.115508 0.204954
0.089357 0.092797 0.078459 0.064039 [error]
Peak 0.026855 0.051216 0.028440 0.009091
0.012654 0.012429 0.010781 0.008240 [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 4.22e-07 6.78e-07 8.22e-07 1.95e-06 2.48e-06 3.87e-06 erg/cm2
Error 4.58e-08 4.50e-08 7.97e-08 4.00e-07 1.85e-07 4.67e-07 erg/cm2
Peak flux Power-law 4.03e-01 2.88e-01 1.36e-01 9.07e-02 8.71e-01 9.18e-01 ph/cm2/s
Error 1.74e-01 9.79e-02 7.05e-02 9.72e-02 2.94e-01 3.11e-01 ph/cm2/s
Fluence Cutoff-PL 4.18e-07 6.83e-07 8.24e-07 1.74e-06 2.47e-06 3.64e-06 erg/cm2
Error 5.07e-08 5.19e-08 8.15e-08 7.48e-07 2.03e-07 7.84e-07 erg/cm2
Peak flux Cutoff-PL 2.43e-01 3.87e-01 1.77e-01 1.43e-02 8.20e-01 8.23e-01 ph/cm2/s
Error 2.14e-01 1.36e-01 1.02e-01 4.40e-02 3.05e-01 3.06e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.62e-01 3.81e-01 1.78e-01 1.69e-02 8.36e-01 8.37e-01 ph/cm2/s
Error 2.41e-01 1.36e-01 1.01e-01 -------- 3.04e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.722 0.122 - - 1.97e-03 1.40e-04 70.070 57
CPL 1.653 0.446 241.3 -34.3 2.14e-03 9.53e-04 69.990 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.080 0.566 - - 5.59e-03 2.33e-03 58.360 57
CPL -0.831 4.456 47.4 24.5 1.80e-01 1.51e+02 54.780 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: 91.136000 sec.
T50 in the 50-300 keV band: 40.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 136.152 -50.996 85.156
T90 104.172 -48.460 55.712
T50 53.160 -37.692 15.468
Peak 1.000 -48.592 -47.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
15.6111 -59.0978 0.0165 23.7 52.3 2.1183 11.6 TRIG_01340561
------------------------------------------
Foreground time interval of the image:
-17.299 72.501 (delta_t = 89.800 [sec])
Background time interval of the image:
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 -50.996 sec. to 85.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72183 ( -0.121377 0.123378 )
Norm@50keV : 1.97019E-03 ( -0.000140518 0.000139162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.145828e-01
Photon flux (15-150 keV) in 136.2 sec: 0.263690 ( -0.0176237 0.0176565 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48049e-06 ( -1.84558e-07 1.86087e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -50.996 sec. to 85.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65305 ( -0.459052 0.433284 )
Epeak [keV] : 241.271 ( -172.726 -241.272 )
Norm@50keV : 2.14074E-03 ( -0.000381041 0.00152535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.99 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 56 degrees of freedom
# Null hypothesis probability = 9.894720e-02
Photon flux (15-150 keV) in 136.2 sec: 0.262712 ( -0.01853 0.018261 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46647e-06 ( -2.07215e-07 1.98008e-07 ) ergs/cm2
Band function
Time interval is from -50.996 sec. to 85.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.20807E-02 ( 1.20348 1.20348 )
beta : -1.73949 ( 1.74317 0.139341 )
Epeak [keV] : 24.8042 ( -40.5787 -40.5787 )
Norm@50keV : 5.58195E-02 ( -0.0538573 529.642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.90 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 55 degrees of freedom
# Null hypothesis probability = 8.501466e-02
Photon flux (15-150 keV) in 136.2 sec: 0.262767 ( ) 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] : 12.9362 ( )
R^2/D10^2 : 4.68520E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 140.25 using 59 PHA bins.
# Reduced chi-squared = 2.4605 for 57 degrees of freedom
# Null hypothesis probability = 5.732612e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.265e-07 2.847e-08
25- 50 7.759e-07 6.040e-08
50-150 8.186e-07 1.376e-07
15-150 1.821e-06 1.396e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 133.387 (-35.6916 53.61)
Norm : 1.09092 (-0.0866564 0.106745)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.849e-07 3.800e-08
25- 50 7.008e-07 7.893e-08
50-150 1.315e-06 4.778e-07
15-150 2.401e-06 5.244e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.86572 (-0.990256 1.11424)
R1^2/D10^2 : 0.598441 (-0.284163 0.64294)
kT2 [keV] : 23.4920 (-3.74594 5.60863)
R2^2/D10^2 : 4.36223E-03 (-0.00233729 0.00397842)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.193e-07 1.007e-07
25- 50 6.649e-07 1.273e-07
50-150 1.358e-06 3.804e-07
15-150 2.442e-06 6.524e-07
Peak spectrum fit
Power-law model
Time interval is from -48.592 sec. to -47.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07992 ( -0.490436 0.641962 )
Norm@50keV : 5.59018E-03 ( -0.00239682 0.00226459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.252235e-01
Photon flux (15-150 keV) in 1 sec: 0.870888 ( -0.294312 0.294533 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18269e-08 ( -1.97134e-08 2.03947e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -48.592 sec. to -47.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.831167 ( -6.1384 2.77366 )
Epeak [keV] : 47.3816 ( -25.8412 23.0701 )
Norm@50keV : 0.179641 ( -0.21794 301.141 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 56 degrees of freedom
# Null hypothesis probability = 5.210571e-01
Photon flux (15-150 keV) in 1 sec: 0.819902 ( -0.304275 0.305508 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08623e-08 ( -1.80494e-08 2.03892e-08 ) ergs/cm2
Band function
Time interval is from -48.592 sec. to -47.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.776398 ( -2.4328 -0.622743 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 47.3710 ( -26.1674 23.1498 )
Norm@50keV : 0.169134 ( -0.169138 30.4078 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.79 using 59 PHA bins.
# Reduced chi-squared = 0.9961 for 55 degrees of freedom
# Null hypothesis probability = 4.827422e-01
Photon flux (15-150 keV) in 1 sec: 0.836010 ( 6.16399 -0.321404 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19409e-08 ( -5.19339e-08 -1.917e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2516 (-3.19859 4.02161)
R^2/D10^2 : 0.219076 (-0.219076 0.441166)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.965e-09 4.349e-09
25- 50 2.246e-08 1.329e-08
50-150 2.054e-08 1.488e-08
15-150 4.997e-08 3.262e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.6701 (-33.5636 102.043)
Norm : 4.66138 (-1.84355 2.74473)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.182e-08 7.132e-09
25- 50 1.831e-08 1.188e-08
50-150 2.187e-08 1.962e-08
15-150 5.200e-08 3.499e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.78260 (-1.63048 15.4401)
R1^2/D10^2 : 1234.45 (-1113.07 -1113.07)
kT2 [keV] : 13.1515 (-3.45595 4.61212)
R2^2/D10^2 : 0.159075 (-0.158901 0.149524)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.429e-09 4.290e-09
25- 50 2.062e-08 1.276e-08
50-150 2.215e-08 1.534e-08
15-150 5.220e-08 3.148e-08
Plot creation:
Tue Aug 12 10:10:09 EDT 2025