Previous IAU Circulars 
(All information courtesy of the instrument teams.)
Previous IAU Circulars
Results of Observations
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:43:31 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1270788, Seg_Num: 0
GRB_RA: 327.922d {+21h 51m 41s} (J2000),
328.352d {+21h 53m 25s} (current),
327.053d {+21h 48m 13s} (1950)
GRB_DEC: -56.685d {-56d 41' 06"} (J2000),
-56.568d {-56d 34' 02"} (current),
-56.920d {-56d 55' 11"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 7828 [cnts] Image_Peak=468 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 137 E_range: 15-50 keV
BKG_INTEN: 52937 [cnts]
BKG_TIME: 78181.38 SOD {21:43:01.38} UT
BKG_DUR: 8 [sec]
GRB_DATE: 20641 TJD; 332 DOY; 24/11/27
GRB_TIME: 78196.23 SOD {21:43:16.23} UT
GRB_PHI: -178.08 [deg]
GRB_THETA: 11.81 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 12.04 [sigma]
IMAGE_SIGNIF: 12.63 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +1 +2 +0 +0 -35 +0
SUN_POSTN: 244.27d {+16h 17m 05s} -21.33d {-21d 19' 48"}
SUN_DIST: 69.12 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 205.98d {+13h 43m 54s} -12.87d {-12d 52' 17"}
MOON_DIST: 95.84 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.34,-46.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 307.80,-40.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 344.59,-18.86 [deg].
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:45:02 UT
NOTICE_TYPE: Swift-XRT Image
TRIGGER_NUM: 1270788, Seg_Num: 0
GRB_RA: 327.8842d {+21h 51m 32.2s} (J2000),
328.3145d {+21h 53m 15.4s} (current),
327.0149d {+21h 48m 03.5s} (1950)
GRB_DEC: -56.6648d {-56d 39' 53.2"} (J2000),
-56.5471d {-56d 32' 49.4"} (current),
-56.8995d {-56d 53' 58.1"} (1950)
GRB_ERROR: 5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 99 [cnts]
IMG_START_DATE: 20641 TJD; 332 DOY; 24/11/27
IMG_START_TIME: 78262.86 SOD {21:44:22.86} UT, 66.6 [sec] since BAT Trigger Time
CENTROID_X: 296.34, raw= 296 [pixels]
CENTROID_Y: 269.65, raw= 270 [pixels]
ROLL: 263.02 [deg]
GAIN: 1
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: -68.47
GRB_POS_XRT_Z: -35.95
IMAGE_URL: sw01270788000msxps_rw.img
SUN_POSTN: 244.27d {+16h 17m 05s} -21.33d {-21d 19' 49"}
SUN_DIST: 69.10 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 205.99d {+13h 43m 57s} -12.88d {-12d 52' 37"}
MOON_DIST: 95.82 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.38,-46.63 [deg] galactic lon,lat of the burst
ECL_COORDS: 307.78,-40.57 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Image.
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:45:05 UT
NOTICE_TYPE: Swift-XRT Processed Image
TRIGGER_NUM: 1270788, Seg_Num: 0
GRB_RA: 327.8842d {+21h 51m 32.2s} (J2000),
328.3145d {+21h 53m 15.4s} (current),
327.0149d {+21h 48m 03.5s} (1950)
GRB_DEC: -56.6648d {-56d 39' 53.2"} (J2000),
-56.5471d {-56d 32' 49.4"} (current),
-56.8995d {-56d 53' 58.1"} (1950)
GRB_ERROR: 5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 99 [cnts]
IMG_START_DATE: 20641 TJD; 332 DOY; 24/11/27
IMG_START_TIME: 78262.86 SOD {21:44:22.86} UT, 66.6 [sec] since BAT Trigger Time
CENTROID_X: 296.34, raw= 296 [pixels]
CENTROID_Y: 269.65, raw= 270 [pixels]
ROLL: 263.02 [deg]
GAIN: 1
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: -68.47
GRB_POS_XRT_Z: -35.95
IMAGE_URL: sw01270788000msxps_rw.img
SUN_POSTN: 244.27d {+16h 17m 05s} -21.33d {-21d 19' 49"}
SUN_DIST: 69.10 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 205.99d {+13h 43m 57s} -12.88d {-12d 52' 37"}
MOON_DIST: 95.82 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.38,-46.63 [deg] galactic lon,lat of the burst
ECL_COORDS: 307.78,-40.57 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Processed Image.
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:46:49 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1270788, Seg_Num: 0
GRB_RA: 327.922d {+21h 51m 41s} (J2000),
328.352d {+21h 53m 25s} (current),
327.053d {+21h 48m 13s} (1950)
GRB_DEC: -56.685d {-56d 41' 06"} (J2000),
-56.568d {-56d 34' 02"} (current),
-56.920d {-56d 55' 11"} (1950)
GRB_DATE: 20641 TJD; 332 DOY; 24/11/27
GRB_TIME: 78196.23 SOD {21:43:16.23} UT
TRIGGER_INDEX: 137
GRB_PHI: -178.08 [deg]
GRB_THETA: 11.81 [deg]
DELTA_TIME: -43.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 12.04 [sigma]
IMAGE_SIGNIF: 12.63 [sigma]
LC_URL: sw01270788000msb.lc
SUN_POSTN: 244.27d {+16h 17m 06s} -21.33d {-21d 19' 50"}
SUN_DIST: 69.11 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 206.00d {+13h 44m 00s} -12.88d {-12d 53' 00"}
MOON_DIST: 95.82 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.34,-46.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 307.80,-40.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 344.59,-18.86 [deg].
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:44:52 UT
NOTICE_TYPE: Swift-XRT Position
TRIGGER_NUM: 1270788, Seg_Num: 0
GRB_RA: 327.8842d {+21h 51m 32.20s} (J2000),
328.3145d {+21h 53m 15.47s} (current),
327.0149d {+21h 48m 03.58s} (1950)
GRB_DEC: -56.6648d {-56d 39' 53.2"} (J2000),
-56.5471d {-56d 32' 49.4"} (current),
-56.8995d {-56d 53' 58.1"} (1950)
GRB_ERROR: 5.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 2.12e-09 [erg/cm2/sec]
GRB_SIGNIF: 9.94 [sigma]
IMG_START_DATE: 20641 TJD; 332 DOY; 24/11/27
IMG_START_TIME: 78262.86 SOD {21:44:22.86} UT, 66.6 [sec] since BAT Trigger Time
TAM[0-3]: 327.65 237.15 261.60 243.80
AMPLIFIER: 2
WAVEFORM: 134
SUN_POSTN: 244.27d {+16h 17m 05s} -21.33d {-21d 19' 49"}
SUN_DIST: 69.10 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 205.99d {+13h 43m 57s} -12.88d {-12d 52' 35"}
MOON_DIST: 95.82 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.38,-46.63 [deg] galactic lon,lat of the burst
ECL_COORDS: 307.78,-40.57 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: The XRT position is 1.75 arcmin from the BAT position.
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:55:43 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 1270788, Seg_Num: 0
POINT_RA: 327.906d {+21h 51m 37s} (J2000)
POINT_DEC: -56.681d {-56d 40' 52"} (J2000)
ROLL: 263.023d
IMG_START_DATE: 20641 TJD; 332 DOY; 24/11/27
IMG_START_TIME: 78680.29 SOD {21:51:20.29} UT, 484.1 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 754437114
X_OFFSET: 725 [pixels]
Y_OFFSET: 872 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 885
Y_GRB_POS: 1032
BINNING_INDEX: 1
IM_URL: sw01270788000msuni0519.fits
SUN_POSTN: 244.28d {+16h 17m 07s} -21.33d {-21d 19' 54"}
SUN_DIST: 69.10 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 206.07d {+13h 44m 17s} -12.92d {-12d 54' 54"}
MOON_DIST: 95.75 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.35,-46.64 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 307.79,-40.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The GRB Position came from the Window Position in the Mode Command.
COMMENTS: The image has 2x2 binning (compression).
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 27 Nov 24 21:55:50 UT
NOTICE_TYPE: Swift-UVOT Processed Image
TRIGGER_NUM: 1270788, Seg_Num: 0
POINT_RA: 327.906d {+21h 51m 37s} (J2000)
POINT_DEC: -56.681d {-56d 40' 52"} (J2000)
ROLL: 263.023d
IMG_START_DATE: 20641 TJD; 332 DOY; 24/11/27
IMG_START_TIME: 78680.29 SOD {21:51:20.29} UT, 484.1 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 754437114
X_OFFSET: 725 [pixels]
Y_OFFSET: 872 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 885
Y_GRB_POS: 1032
BINNING_INDEX: 1
IM_URL: sw01270788000msuni0519.fits
SUN_POSTN: 244.28d {+16h 17m 07s} -21.33d {-21d 19' 54"}
SUN_DIST: 69.10 [deg] Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN: 206.07d {+13h 44m 17s} -12.92d {-12d 54' 56"}
MOON_DIST: 95.75 [deg]
MOON_ILLUM: 10 [%]
GAL_COORDS: 337.35,-46.64 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 307.79,-40.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Processed Image.
COMMENTS: The GRB Position came from the Window Position in the Mode Command.
COMMENTS: The image has 2x2 binning (compression).
COMMENTS: All 4 attachments are included.
T-Tmid Date Time Expt. Ra Dec Mag
---------|---------------------|-------|-----------------|-----------------|-------
103 2024-11-27 21:44:49 20 (21h 51m 32.48s , -56d 39m 55.8s) 15.5
The 5-sigma upper limit has been about 17.4mag
The message may be cited.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
41 | MASTER-SAAO | C | 10 | 13.0 |
56 | MASTER-SAAO | C | 40 | 17.9 | Coadd
70 | MASTER-SAAO | C | 10 | 17.5 |
104 | MASTER-SAAO | C | 20 | 17.9 |
143 | MASTER-SAAO | C | 20 | 16.7 |
178 | MASTER-SAAO | C | 90 | 18.3 | Coadd
187 | MASTER-SAAO | C | 30 | 17.7 |
241 | MASTER-SAAO | C | 40 | 17.9 |
305 | MASTER-SAAO | C | 50 | 15.7 |
379 | MASTER-SAAO | C | 60 | 14.9 |
Filter C is a clear (unfiltred) band.
RA(J2000) = 21h 51m 41s Dec(J2000) = -56d 41' 06"with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 10 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
RA(J2000) = 21h 51m 32.05s Dec(J2000) = -56d 39' 52.5"with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 105 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
RA(J2000) = 21:51:32.32 = 327.88467 DEC(J2000) = -56:39:55.1 = -56.66531with a 90%-confidence error radius of about 0.61 arc sec. This position is 2.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.14 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.034.
T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 10230 2024-11-28 00:33:17 60 (21h 51m 32.32s , -56d 39m 56.5s) 19.4The 5-sigma upper limit has been about 19.3mag The message may be cited.
RA (J2000): 21h 51m 32.50s Dec (J2000): -56d 39' 55.6"with an uncertainty of 2.1 arcsec (radius, 90% confidence).
Total column: 8.0 (+4.5, -3.9) x 10^20 cm^-2 Galactic foreground: 2.7 x 10^20 cm^-2 Excess significance: 2.2 sigma Photon index: 1.97 (+0.18, -0.17)The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01270788.
Filter T_start(s) T_stop(s) Exp(s) Mag white 484 634 147 17.04 ± 0.03 white 16459 16862 393 19.81 +/1 0.09 b 15547 16453 885 20.3 ± 0.3 u 21787 22629 821 19.1 ± 0.1 v 10002 10870 847 19.7 ± 0.2 uvw1 20881 21780 886 19.5 ± 0.3The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.034 in the direction of the burst (Schlegel et al. 1998).
| Tstart (UTC) | Telescope | Exposure | Filter | Magnitude | | 2024-11-28T00:33:05 | FRAM-Auger | 20x120s | R | 18.78 +- 0.20 (Vega)| | 2024-11-28T00:50:45 | TAROT-TCH | 4x180s | R | 19.14 +- 0.17 (Vega)| | 2024-11-28T01:16:26 | KNC-CHI-1 | 2x120s | r' | 19.4 +- 0.1 (AB) | | 2024-11-28T01:20:52 | KNC-CHI-1 | 2x120s | g' | 19.74 +- 0.09 (AB) |All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). TCH and KNC images were calibrated using the SkyMapper DR4 catalogue, the FRAM-Auger image used Gaia DR3 Synphot. The data are not corrected from Galaxy extinction.
| Filter | Mag(AB) | |--------|--------------| | J | 20.5 +/- 0.1 | | H | > 20.1 |PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa at the South African Astronomical Observatory (SAAO) (Kutyrev et al. 2023, Yama et al. 2023, Durbak et al. 2024).
RA(J2000) = 21h 51m 38.5s Dec(J2000) = -56d 39' 08.1"with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
