Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Fri Oct 6 18:53:26 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1180410
======================================================================
Trigger: 01180410 Segment: 000
BAT Trigger Time: 711805384.576 [s; MET]
Trigger Stop: 711805385.088 [s; MET]
UTC: 2023-07-23T11:42:32.881800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.378850607907 Dec: -5.3272728850738 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.27
Image Trigger?: NO
Rate S/N Ratio: 14.247806848775 [ if not an image trigger ]
Image S/N Ratio: 8.27
Analysis Position: [ source = BAT ]
RA: 250.378850607907 Dec: -5.3272728850738 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 250.390286464428 Dec: -5.31940688710297 [deg; J2000]
{ 16h 41m 33.7s , -05d 19' 09.9" }
+/- 1.00654104356603 [arcmin] (estimated 90% radius based on SNR)
+/- 0.371707017118001 [arcmin] (formal 1-sigma fit error)
SNR: 30.135152673139
Angular difference between the analysis and refined position is 0.830360 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 5.75599992275238 +/- 0.85248116255725
Measured from: 0.116000056266785
to: 5.87199997901917 [s; relative to TRIGTIME]
T50: 2.67199993133545 +/- 0.354039587178118
Measured from: 1.24000000953674
to: 3.91199994087219 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.6360000371933
to: 2.6360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.215999960899353
to: 7.93599998950958 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.728244 1.108567 0.708448 0.146779
0.050948 0.048669 0.039867 0.028660 [error]
Peak 0.142584 0.276029 0.153727 0.033304
0.019304 0.020048 0.016134 0.010812 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 8.152 -0.216 7.936
T90 5.756 0.116 5.872
T50 2.672 1.240 3.912
Peak 1.000 1.636 2.636
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: CPL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.807 -0.093 0.091 - - - 2.28e-02 -1.26e-03 1.25e-03 58.290 57
CPL -1.062 -0.408 0.447 63.907 -8.721 19.261 5.34e-02 -1.96e-02 3.49e-02 47.980 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.861 -0.149 0.144 - - - 3.88e-02 -3.88e-03 3.86e-03 68.540 57
CPL -0.227 -0.782 0.983 53.771 -6.673 9.895 2.66e-01 -1.59e-01 5.94e-01 53.320 56
=== 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 PL 3.17e-07 4.83e-07 5.52e-07 1.21e-06 1.71e-06 2.56e-06 erg/cm2
90%_error_low -2.81e-08 -2.70e-08 -3.90e-08 -1.70e-07 -9.54e-08 -2.05e-07 erg/cm2
90%_error_hi 2.90e-08 2.70e-08 3.89e-08 1.86e-07 9.57e-08 2.16e-07 erg/cm2
Peak flux PL 2.26e+00 1.84e+00 1.01e+00 8.19e-01 5.48e+00 5.94e+00 ph/cm2/s
90%_error_low -3.22e-01 -1.81e-01 -1.24e-01 -1.76e-01 -5.43e-01 -5.64e-01 ph/cm2/s
90%_error_hi 3.35e-01 1.80e-01 1.23e-01 1.98e-01 5.44e-01 5.65e-01 ph/cm2/s
Fluence CPL 2.76e-07 5.16e-07 5.81e-07 4.98e-07 1.64e-06 1.87e-06 erg/cm2
90%_error_low -3.46e-08 -3.29e-08 -4.43e-08 -1.74e-07 -1.03e-07 -2.01e-07 erg/cm2
90%_error_hi 3.54e-08 3.35e-08 4.49e-08 2.86e-07 1.03e-07 2.94e-07 erg/cm2
Peak flux CPL 1.71e+00 2.15e+00 1.17e+00 2.41e-01 5.23e+00 5.27e+00 ph/cm2/s
90%_error_low -3.81e-01 -2.38e-01 -1.59e-01 -1.24e-01 -5.52e-01 -5.70e-01 ph/cm2/s
90%_error_hi 4.01e-01 2.48e-01 1.60e-01 1.88e-01 5.55e-01 5.79e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 250.3903 -5.3194 0.0064 44.6764 -21.3511 2.8187548 30.135 TRIG_01180410 Foreground time interval of the image: -0.216 7.936 (delta_t = 8.152 [sec]) Background time interval of the image: -239.576 -0.216 (delta_t = 239.360 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.216 sec. to 7.936 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.80652 ( -0.0926036 0.091441 ) Norm@50keV : 2.27983E-02 ( -0.0012568 0.00125303 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.29 using 59 bins. Reduced chi-squared = 1.02263 # Null hypothesis probability of 4.28e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 8.152 sec: 3.14970 ( -0.18106 0.18168 ) ph/cm2/s Energy fluence (15-150 keV) : 1.71086e-06 ( -9.54452e-08 9.56654e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.216 sec. to 7.936 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06206 ( -0.408281 0.447159 ) Epeak [keV] : 63.9075 ( -8.72115 19.2608 ) Norm@50keV : 5.34469E-02 ( -0.0196012 0.0349084 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.98 using 59 bins. Reduced chi-squared = 0.856786 # Null hypothesis probability of 7.68e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 8.152 sec: 3.02626 ( -0.19139 0.19221 ) ph/cm2/s Energy fluence (15-150 keV) : 1.64329e-06 ( -1.02956e-07 1.02952e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.636 sec. to 2.636 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.86106 ( -0.149026 0.143873 ) Norm@50keV : 3.88250E-02 ( -0.00388363 0.00385805 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 68.54 using 59 bins. Reduced chi-squared = 1.20246 # Null hypothesis probability of 1.41e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 5.48232 ( -0.54253 0.54395 ) ph/cm2/s Energy fluence (15-150 keV) : 3.57001e-07 ( -3.56645e-08 3.57524e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.636 sec. to 2.636 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.226801 ( -0.781635 0.982822 ) Epeak [keV] : 53.7711 ( -6.67283 9.8958 ) Norm@50keV : 0.265552 ( -0.15865 0.593599 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.32 using 59 bins. Reduced chi-squared = 0.952143 # Null hypothesis probability of 5.77e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 5.22752 ( -0.55235 0.55465 ) ph/cm2/s Energy fluence (15-150 keV) : 3.40706e-07 ( -3.76869e-08 3.77366e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 5.756 sec. Hardness ratio (energy fluence ratio) = 1.1250193618
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.925031e-07 S(50-150 keV) = 8.507778e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 9.209038686364036E-01, IMY = 3.599928070229617E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.576000 -0.216000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9875 -15.6341 0.4 40.9 -37.5 24.9596 26.5 0.6 Sco X-1 255.8390 -38.0189 0.0 22.2 -68.8 0.5193 0.7 12.6 4U 1700-377 256.4505 -36.4652 4.9 21.9 -64.5 1.5163 2.3 2.6 GX 349+2 262.9512 -24.9236 31.5 22.1 -29.8 0.1906 0.4 11.1 GX 1+4 264.7525 -44.5991 10.5 15.9 -90.7 0.6153 1.1 9.0 4U 1735-44 268.4411 -1.4217 9.1 39.2 5.2 0.9006 1.3 4.8 SW J1753.5-0127 270.3075 -25.1094 4.2 17.3 -16.0 1.3913 2.8 2.2 GX 5-1 270.3399 -25.5650 5.6 16.9 -16.9 1.0559 2.1 10.9 GRS 1758-258 274.1034 -13.9614 4.2 25.5 7.5 1.6146 2.7 7.2 GX 17+2 275.7188 -30.3371 8.0 10.2 -14.5 0.7224 1.4 10.8 H1820-303 285.0774 -24.7342 249.0 13.2 34.5 -0.0225 -0.0 11.4 HT1900.1-2455 288.7772 10.7940 0.0 48.9 36.5 -1.5782 -1.1 9.2 GRS 1915+105 262.9437 -33.8518 3.7 17.5 -52.8 1.8095 3.2 2.5 GX 354-0 325.2034 -19.9182 2.7 39.8 105.3 6.6723 4.3 ------ UNKNOWN 307.8410 -13.4907 3.5 32.3 77.6 3.2390 3.3 ------ UNKNOWN 310.3498 -16.3596 2.9 31.6 84.6 3.6718 3.9 ------ UNKNOWN 329.5471 -42.6233 2.5 34.6 142.9 3.8698 4.7 ------ UNKNOWN 1.2526 -58.1947 2.2 52.1 169.7 8.2054 5.2 ------ UNKNOWN 11.6439 -86.8568 2.6 52.0 -153.6 6.4828 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.216000 7.936000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1089 -15.5841 15.0 40.9 -37.4 0.0699 0.8 8.2 Sco X-1 255.9531 -37.7058 5.5 22.1 -67.9 -0.1197 -2.1 8.4 4U 1700-377 256.2931 -36.6001 0.0 22.0 -64.9 0.0951 1.6 12.6 GX 349+2 263.1955 -24.8121 4.6 22.0 -29.2 -0.1327 -2.5 10.9 GX 1+4 264.8636 -44.5741 24.3 15.8 -90.7 0.0262 0.5 9.1 4U 1735-44 268.4296 -1.3141 4.6 39.3 5.2 -0.2155 -2.5 9.1 SW J1753.5-0127 270.3329 -25.2230 17.2 17.2 -16.2 0.0346 0.7 9.0 GX 5-1 270.2186 -25.9393 0.0 16.7 -18.0 0.1329 2.6 12.6 GRS 1758-258 273.9191 -14.0852 10.4 25.4 7.0 -0.0654 -1.1 5.8 GX 17+2 275.8353 -30.5482 7.0 10.0 -14.8 0.0854 1.7 11.8 H1820-303 284.9948 -24.8501 4.2 13.1 34.2 -0.1407 -2.7 4.8 HT1900.1-2455 288.8259 10.9649 74.5 49.1 36.6 -0.0357 -0.2 2.0 GRS 1915+105 262.7997 -33.8229 19.5 17.6 -52.8 0.0328 0.6 9.5 GX 354-0 347.2320 -50.3460 2.5 45.6 157.5 0.5026 4.6 ------ UNKNOWN 346.6344 -51.7342 2.3 45.0 159.3 0.5467 5.0 ------ UNKNOWN 250.3903 -5.3194 0.4 44.7 -21.4 2.8185 30.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: