- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sun 04 Feb 24 15:10:24 UT
NOTICE_TYPE: Swift-XRT Nack-Position
TRIGGER_NUM: 1212898, Seg_Num: 0
POINT_RA: 104.131d {+06h 56m 31s} (J2000)
POINT_DEC: +1.058d {+01d 03' 28"} (J2000)
IMG_START_DATE: 20344 TJD; 35 DOY; 24/02/04
IMG_START_TIME: 54612.21 SOD {15:10:12.21} UT, 71237.1 [sec] since BAT Trigger Time
COUNTS: 36 Min_needed= 20
STD_DEV: 0.00 Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER: 4 Max_iter_allowed= 4
ERROR_CODE: 2
COMMENTS: SWIFT-XRT Nack Position.
COMMENTS: Algorithm did not converge; too many iterations.
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 04 Feb 24 15:08:08 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 47
TRIGGER_NUM: 728752063
GRB_RA: 89.133d {+05h 56m 32s} (J2000),
89.443d {+05h 57m 46s} (current),
88.492d {+05h 53m 58s} (1950)
GRB_DEC: +0.233d {+00d 13' 60"} (J2000),
+0.235d {+00d 14' 06"} (current),
+0.228d {+00d 13' 39"} (1950)
GRB_ERROR: 25.65 [deg radius, statistical plus systematic]
GRB_INTEN: 62 [cnts/sec]
DATA_SIGNIF: 5.00 [sigma]
INTEG_TIME: 4.096 [sec]
GRB_DATE: 20344 TJD; 35 DOY; 24/02/04
GRB_TIME: 54458.68 SOD {15:07:38.68} UT
GRB_PHI: 135.00 [deg]
GRB_THETA: 90.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO: 2.36
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 74% GRB
2nd_MOST_LIKELY: 22% Generic SGR
DETECTORS: 0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN: 317.75d {+21h 11m 00s} -16.25d {-16d 14' 55"}
SUN_DIST: 129.77 [deg] Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN: 241.90d {+16h 07m 36s} -24.77d {-24d 46' 10"}
MOON_DIST: 143.79 [deg]
MOON_ILLUM: 33 [%]
GAL_COORDS: 206.37,-12.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 89.06,-23.20 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_lc_medres34_bn240204630.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 18.62,-11.77 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 04 Feb 24 15:08:23 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 69
TRIGGER_NUM: 728752063
GRB_RA: 105.200d {+07h 00m 48s} (J2000),
105.500d {+07h 02m 00s} (current),
104.576d {+06h 58m 18s} (1950)
GRB_DEC: -3.650d {-03d 38' 59"} (J2000),
-3.686d {-03d 41' 07"} (current),
-3.578d {-03d 34' 41"} (1950)
GRB_ERROR: 4.20 [deg radius, statistical plus systematic]
GRB_INTEN: 1087 [cnts/sec]
DATA_SIGNIF: 78.80 [sigma]
INTEG_TIME: 4.096 [sec]
GRB_DATE: 20344 TJD; 35 DOY; 24/02/04
GRB_TIME: 54458.68 SOD {15:07:38.68} UT
GRB_PHI: 141.00 [deg]
GRB_THETA: 105.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO: 1.59
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 82% GRB
2nd_MOST_LIKELY: 13% Generic SGR
DETECTORS: 0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN: 317.75d {+21h 11m 01s} -16.25d {-16d 14' 54"}
SUN_DIST: 142.40 [deg] Sun_angle= -9.8 [hr] (East of Sun)
MOON_POSTN: 241.90d {+16h 07m 37s} -24.77d {-24d 46' 12"}
MOON_DIST: 129.00 [deg]
MOON_ILLUM: 33 [%]
GAL_COORDS: 217.25, 0.42 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 106.95,-26.20 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_lc_medres34_bn240204630.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 18.62,-11.77 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 04 Feb 24 15:08:17 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 58
TRIGGER_NUM: 728752063
GRB_RA: 108.683d {+07h 14m 44s} (J2000),
108.976d {+07h 15m 54s} (current),
108.075d {+07h 12m 18s} (1950)
GRB_DEC: -7.100d {-07d 05' 59"} (J2000),
-7.143d {-07d 08' 35"} (current),
-7.012d {-07d 00' 43"} (1950)
GRB_ERROR: 16.02 [deg radius, statistical plus systematic]
GRB_INTEN: 174 [cnts/sec]
DATA_SIGNIF: 7.80 [sigma]
INTEG_TIME: 2.048 [sec]
GRB_DATE: 20344 TJD; 35 DOY; 24/02/04
GRB_TIME: 54458.68 SOD {15:07:38.68} UT
GRB_PHI: 140.00 [deg]
GRB_THETA: 110.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO: 2.10
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 73% GRB
2nd_MOST_LIKELY: 22% Generic SGR
DETECTORS: 0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN: 317.75d {+21h 11m 01s} -16.25d {-16d 14' 55"}
SUN_DIST: 143.15 [deg] Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN: 241.90d {+16h 07m 37s} -24.77d {-24d 46' 11"}
MOON_DIST: 124.16 [deg]
MOON_ILLUM: 33 [%]
GAL_COORDS: 221.91, 1.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 111.35,-29.17 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_lc_medres34_bn240204630.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 18.62,-11.77 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 04 Feb 24 15:08:27 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 57
TRIGGER_NUM: 728752063
GRB_RA: 78.090d {+05h 12m 22s} (J2000),
78.394d {+05h 13m 35s} (current),
77.458d {+05h 09m 50s} (1950)
GRB_DEC: -1.860d {-01d 51' 35"} (J2000),
-1.833d {-01d 49' 57"} (current),
-1.919d {-01d 55' 07"} (1950)
GRB_ERROR: 11.68 [deg radius, statistical only]
DATA_SIGNIF: 6.30 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 20344 TJD; 35 DOY; 24/02/04
GRB_TIME: 54458.68 SOD {15:07:38.68} UT
GRB_PHI: 127.00 [deg]
GRB_THETA: 82.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4173 (Gnd S/W Version number)
SUN_POSTN: 317.75d {+21h 11m 01s} -16.25d {-16d 14' 54"}
SUN_DIST: 118.69 [deg] Sun_angle= -8.0 [hr] (East of Sun)
MOON_POSTN: 241.90d {+16h 07m 37s} -24.77d {-24d 46' 12"}
MOON_DIST: 148.96 [deg]
MOON_ILLUM: 33 [%]
GAL_COORDS: 202.81,-22.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 76.87,-24.76 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_lc_medres34_bn240204630.gif
POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_728752063.fits
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: The LC_URL file will not be created/available until ~15 min after the trigger.
COMMENTS: The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 04 Feb 24 15:16:56 UT
NOTICE_TYPE: Fermi-GBM Final Position
RECORD_NUM: 0
TRIGGER_NUM: 728752063
GRB_RA: 101.500d {+06h 46m 00s} (J2000),
101.801d {+06h 47m 12s} (current),
100.876d {+06h 43m 30s} (1950)
GRB_DEC: -3.410d {-03d 24' 35"} (J2000),
-3.437d {-03d 26' 13"} (current),
-3.356d {-03d 21' 21"} (1950)
GRB_ERROR: 1.59 [deg radius, statistical only]
GRB_DATE: 20344 TJD; 35 DOY; 24/02/04
GRB_TIME: 54458.68 SOD {15:07:38.68} UT
GRB_PHI: 139.00 [deg]
GRB_THETA: 102.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 41731 (Gnd S/W Version number)
SUN_POSTN: 317.76d {+21h 11m 02s} -16.25d {-16d 14' 48"}
SUN_DIST: 139.37 [deg] Sun_angle= -9.6 [hr] (East of Sun)
MOON_POSTN: 241.99d {+16h 07m 57s} -24.79d {-24d 47' 20"}
MOON_DIST: 132.14 [deg]
MOON_ILLUM: 33 [%]
GAL_COORDS: 215.35, -2.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 102.83,-26.34 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_lc_medres34_bn240204630.gif
LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_locplot_all_bn240204630.png
COMMENTS: Fermi-GBM Final Position.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: The LC_URL file should be available by the time this FINAL notice is produced.
COMMENTS: This notice was generated completely by automated pipeline processing.
COMMENTS: This is likely a Long GRB.
- GCN Circular #35664
The Fermi GBM team reports the detection of a likely LONG GRB
At 15:07:38 UT on 4 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240204A (trigger 728752063.677018 / 240204630).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 101.5, Dec = -3.4 (J2000 degrees, equivalent to J2000 06h 46m, -3d 23'), with a statistical uncertainty of 1.6 degrees.
The angle from the Fermi LAT boresight is 102.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_skymap_all_bn240204630.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_healpix_all_bn240204630.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240204630/quicklook/glg_lc_medres34_bn240204630.gif
- GCN Circular #35666
S. B. Cenko (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU),
J. A. Kennea (PSU) and K. L. Page (U Leicester) report on behalf of
the Neil Gehrels Swift Observatory Team:
Swift/BAT triggered on the Fermi/GBM reported long GRB 240204A (GCN #35664).
Due to a telemetry outage, no realtime BAT data are available.
The XRT began observing the field at 15:10:12.2 UT, 154 seconds
after the Fermi/GBM trigger. Using promptly downlinked data we find an
uncatalogued X-ray source located at RA, Dec 104.18190, 1.02767 which
is equivalent to:
RA(J2000) = 06h 56m 43.66s
Dec(J2000) = +01d 01' 39.6"
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This
position may be improved as more data are received; the latest position
is available at https://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 6.45
x 10^21 cm^-2 (Willingale et al. 2013).
Due to a telemetry outage, there are no UVOT data available at this time.
Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/)
- GCN Circular #35668
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240204A ( Fermi GBM team, GCN 35664) errorbox 818 sec after notice time and 854 sec after trigger time at 2024-02-04 15:21:52 UT, with upper limit up to 20.8 mag. The observations began at zenith distance = 54 deg. The sun altitude is -48.0 deg.
The galactic latitude b = -2 deg., longitude l = 216 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2371241
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
884 | 2024-02-04 15:21:52 | MASTER-Tunka | (06h 45m 43.71s , -03d 13m 03.5s) | C | 60 | 19.9 |
944 | 2024-02-04 15:21:52 | MASTER-Tunka | (06h 45m 43.71s , -03d 13m 03.5s) | C | 180 | 20.4 | Coadd
1154 | 2024-02-04 15:21:52 | MASTER-Tunka | (06h 45m 43.71s , -03d 13m 03.5s) | C | 600 | 20.8 | Coadd
947 | 2024-02-04 15:22:56 | MASTER-Tunka | (06h 45m 43.78s , -03d 13m 01.1s) | C | 60 | 19.9 |
1011 | 2024-02-04 15:23:59 | MASTER-Tunka | (06h 45m 43.83s , -03d 12m 59.8s) | C | 60 | 19.9 |
1074 | 2024-02-04 15:25:02 | MASTER-Tunka | (06h 45m 43.88s , -03d 12m 57.8s) | C | 60 | 19.9 |
1134 | 2024-02-04 15:25:02 | MASTER-Tunka | (06h 45m 43.88s , -03d 12m 57.9s) | C | 180 | 20.4 | Coadd
1201 | 2024-02-04 15:27:09 | MASTER-Tunka | (06h 45m 44.01s , -03d 12m 54.0s) | C | 60 | 19.8 |
1264 | 2024-02-04 15:28:12 | MASTER-Tunka | (06h 45m 44.05s , -03d 12m 52.5s) | C | 60 | 19.9 |
1327 | 2024-02-04 15:29:15 | MASTER-Tunka | (06h 45m 44.14s , -03d 12m 50.2s) | C | 60 | 19.9 |
1387 | 2024-02-04 15:29:15 | MASTER-Tunka | (06h 45m 44.14s , -03d 12m 50.2s) | C | 180 | 20.4 | Coadd
1454 | 2024-02-04 15:31:22 | MASTER-Tunka | (06h 45m 44.31s , -03d 12m 46.5s) | C | 60 | 19.8 |
1522 | 2024-02-04 15:32:30 | MASTER-Tunka | (06h 45m 49.39s , -03d 12m 38.6s) | C | 60 | 19.9 |
1585 | 2024-02-04 15:33:33 | MASTER-Tunka | (06h 45m 49.44s , -03d 12m 36.0s) | C | 60 | 20.0 |
1645 | 2024-02-04 15:33:33 | MASTER-Tunka | (06h 45m 49.44s , -03d 12m 36.0s) | C | 180 | 20.5 | Coadd
1648 | 2024-02-04 15:34:37 | MASTER-Tunka | (06h 45m 49.50s , -03d 12m 34.2s) | C | 60 | 20.0 |
1712 | 2024-02-04 15:35:40 | MASTER-Tunka | (06h 45m 49.57s , -03d 12m 32.2s) | C | 60 | 20.0 |
1775 | 2024-02-04 15:36:43 | MASTER-Tunka | (06h 45m 49.60s , -03d 12m 30.7s) | C | 60 | 20.0 |
1835 | 2024-02-04 15:36:43 | MASTER-Tunka | (06h 45m 49.61s , -03d 12m 30.8s) | C | 180 | 20.5 | Coadd
1838 | 2024-02-04 15:37:46 | MASTER-Tunka | (06h 45m 49.68s , -03d 12m 29.1s) | C | 60 | 20.1 |
1901 | 2024-02-04 15:38:50 | MASTER-Tunka | (06h 45m 49.73s , -03d 12m 27.3s) | C | 60 | 20.0 |
1965 | 2024-02-04 15:39:53 | MASTER-Tunka | (06h 45m 49.77s , -03d 12m 25.3s) | C | 60 | 20.0 |
2028 | 2024-02-04 15:40:56 | MASTER-Tunka | (06h 45m 49.82s , -03d 12m 23.8s) | C | 60 | 20.0 |
2091 | 2024-02-04 15:41:59 | MASTER-Tunka | (06h 45m 49.86s , -03d 12m 21.8s) | C | 60 | 20.0 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
- GCN Circular #35670
A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE, IKI), S. Belkin (IKI, HSE) report on behalf of IKI-GRB-FuN:
We observed the field of Swift localization of GRB 240204A (Cenko et al., GCN 35666) which is also detected be GMB/Fermi (Fermi GBM team GCN 35664) with AZT-33IK telescope of Mondy observatory starting on 2024-02-04 (UT) 16:05:26. In the first images of 60 s exposure we detected the object in coordinates of (J2000) 06:56:43.36, +01:01:37.7 with uncertainties of 0.2 arcsec in both coordinates. The position of the object is within XRT afterglow localization (Cenko et al., GCN 35666). The object is absent in PS1 catalogue. Preliminary photometry of the object is R ~ 20.6 based on USNO-B1.0 (R2) nearby stars.
We suggest the source is an afterglow of GRB 240204A.
- GCN Circular #35671
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1322 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 240204A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 104.18139, +1.02693 which is equivalent
to:
RA (J2000): 06h 56m 43.53s
Dec (J2000): +01d 01' 36.9"
with an uncertainty of 2.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
- GCN Circular #35672
S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez, L. Bellizzi (Montarren=
ti Observatory, Siena, Italy, part of UAI/SSV-GRB section), M.G. Dainotti (=
National Astronomical Observatory of Japan), Y. Niino (Tokyo University, In=
stitute of Astronomy), K. Kalinowski (Aarhus University, Department of Phys=
ics and Astronomy) and B. De Simone (Universita' degli Studi Di Salerno) re=
port:
We observed the field of GRB 240204A (Swift triggered on the Fermi/GBM, GCN=
35664; Cenko et al., GCN 35666; Pozanenko et al., GCN 35670) with the auto=
mated and remoted 0.53m Ritchey-Chretien telescope at Montarrenti Observato=
ry (Siena, Italy, IAU code C88).
The observations were started under good weather conditions at 2024-02-04 1=
8:58:44 UT (approximately 4 hours after burst) stacking 30x40s Rc-band CCD =
images.
The OT was detected at the following position:
RA (J2000.0) 06h 56m 43.39s +/-0.11
Decl. (J2000.0) +01=C2=B0 01' 38.5" +/-0.14
Preliminary photometry was obtained using nearby PanSTARRS stars as follows:
MJD Filter Mag. Err.
60345.30597 Rc 21.02 +/-0.21
Magnitudes were converted using Lupton (2005) equations and were not corrected for galactic dust extinction.
- GCN Circular #35673
I. P=C3=A9rez-Fournon and F. Poidevin (IAC and ULL) report
We observed the field of GRB 240204A, detected by FERMI GBM (Fermi GBM team=
, GCN 35664) and by Swift XRT (Cenko et al., GCN 35666), centred at the enh=
anced Swift-XRT position reported by Beardmore et al. (GCN 35671) with LCOG=
T 1m telescopes at Sutherland and Teide Observatories. We detect a source, =
not visible in PanSTARRS imaging, at the position RA (J2000) =3D 06:56:43.3=
67, Dec (J2000) =3D +01:01:38.06 (+/- 0.5" in both coordinates). We measure=
the following magnitudes in SDSS filters: r' =3D 21.10 +/- 0.15 on 2024-02=
-04 20:37:30 UT (Sutherland Observatory) and i' =3D 20.79 +/- 0.15 on 2024=
-02-04 21:29:56 UT (Teide Observatory), calibrated using the Gaia DR3 synth=
etic photometry catalog generated from the Gaia BP/RP mean spectra (Gaia Co=
llaboration, 2022), uncorrected for interstellar extinction.
The reported position agrees within the errors with the enhanced Swift-XRT =
position and with the positions of the optical source detected by Pozanenko=
et al. (GCN 35670) and Leonini et al. (GCN 35672).=20
The flux is clearly decreasing in the red bands.
- GCN Circular #35677
Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy
in a large collaboration with:
M.G. Dainotti (National Astronomical Observatory of Japan),
Y. Niino (Tokyo University, Institute of Astronomy),
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Universita' degli Studi Di Salerno)
report:
We image the field of GRB 240204A (Swift triggered on the Fermi/GBM, GCN 35664; Cenko et al., GCN 35666; Pozanenko et al., GCN 35670)
with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of:
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
AstroCampania Associazione
The observations started at 18:16 UT of 2024/02/04, after about 3 hours after the GRB trigger, at the end of twilight
with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME
I took 104 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker and Astrometrica software
We have not detected any clearly visible sources, up to 20th magnitude with clear skies.
Start T0+ End T0+ Rlim
18:16:19 UT 21:15:19 UT 19.5
We did not found any optical counterpart in the error box of the XRTcandidate.
Magnitudes were estimated with the Gaia DR2 cat. and
are not corrected for galactic dust extinction.
The message may be cited.
- GCN Circular #35678
A. Bochenek, J. Wise, D. A. Perley (LJMU) report:
We observed the field of GRB 240204A (Fermi-GBM team, GCN 35664; Cenko et a=
l., GCN 35666; Pozanenko et al., GCN 35670) with the IO:O optical camera on=
the 2m robotic Liverpool Telescope. We conducted two sets of observations,=
the first starting at 2024-02-04 22:39:16 UT (approx. 7.5h after the burst=
), and the second starting at 2024-02-04 23:57:25 UT (approx. 9h after the =
burst). Both consisted of 2x60s exposures in the SDSS g, r, i, and z filter=
s. Conditions were generally good throughout.
=20
The afterglow is detected in the i and z bands in both epochs, and in the r=
-band in the first epoch. We measure the following magnitudes:
MJD Time since burst Filter Mag. (AB)
60344.94386 7.52 hours g > 22.72=20
60344.94585 7.57 hours r 21.37 =C2=B1 0.20
60344.94783 7.62 hours i 20.98 =C2=B1 0.21
60344.94981 7.66 hours z 20.74 =C2=B1 0.20
60344.99812 8.82 hours g > 22.29
60345.00012 8.87 hours r > 22.08
60345.00210 8.92 hours i 20.85 =C2=B1 0.12
60345.00408 8.97 hours z 20.34 =C2=B1 0.13
The photometry was obtained using nearby PanSTARRS secondary standards and =
was not corrected for extinction.
The source was detected at a position consistent with previous detections.
- GCN Circular #35680
L. Scotton (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 15:07:38.68 UT on 04 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240204A (trigger 728752063/240204630),
which was also detected by Swift XRT (S. B. Cenko et al. 2024, GCN 35666).
The Fermi GBM on-ground location is consistent with the Swift XRT position.
The angle from the Fermi LAT boresight is 101 degrees.
The GBM light curve consists of a single emission episode with a duration (T90)
of about 15.9 s (50-300 keV). The time-averaged spectrum
from T0-6.5 to T0+34.5 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.03 +/- 0.03 and the cutoff energy,
parameterized as Epeak, is 84 +/- 2 keV.
The event fluence (10-1000 keV) in this time interval is
(1.69 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+12 s in the 10-1000 keV band is 32.9 +/- 0.5 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 79 +/- 2 keV, alpha = -0.97 +/- 0.04 and beta = -3.0 +/- 0.2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
- GCN Circular #35688
T. Sakamoto (AGU),S. D. Barthelmy (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
M. J. Moss (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
Swift-BAT triggered on GRB 240204A at 15:07:50.63 UT on 2024-02-04.
Swift slewed immediately, but didn=E2=80=99t have initial BAT information d=
ue to a telemetry gap.
Using the data set from T-239 to T+346 sec from the recent telemetry downli=
nk,
we report further analysis of BAT GRB 240204A (trigger #1212898)
(Cenko, et al., GCN Circ. 35666). The BAT ground-calculated position is
RA, Dec =3D 104.290, 1.078 deg which is
RA(J2000) =3D 06h 57m 09.6s
Dec(J2000) =3D +01d 04' 41.5"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 9%.
The BAT light curve shows a complex structure with a duration of ~ 20 sec.
T90 (15-350 keV) is 18.93 +- 2.06 sec (estimated error including systematic=
s).
The time-averaged spectrum from T-22.96 to T+8.96 sec is best fit by a powe=
r law
with an exponential cutoff. This fit gives a photon index 1.21 +- 0.28,
and Epeak of 67.8 +- 12.6 keV (chi squared 41.34 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 1.0 +- 0.0 x 10^-05 erg/c=
m2
and the 1-sec peak flux measured from T+0.08 sec in the 15-150 keV band is
22.1 +- 1.5 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.80 +- 0.06 (chi squared 55.74 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/1212898/BA/
- GCN Circular #35690
C. Adami, D. Russeil, H. LeCoroller (Pyth=C3=A9as/LAM), E. Abdo, M. Carta,
T. Chehab, M. Colliaux, A. Gharibi-Ziarati, E. Pouyer,
A. Jacquet, F. Malaval, S. Aftis (AMU), J. Balcaen, Y. Degot-Longhi, (OHP/Pyth=C3=A9as), E. Le Floc'h, D. G=C3=B6tz, F. Sch=C3=BCssler (CEA
Paris-Saclay), B. Schneider (MIT), S. Basa (Pytheas/OHP/LAM), A. Saccardi,
S. D. Vergani (GEPI, Obs. de Paris),
M. Dennefeld (IAP), report on behalf of a larger collaboration
We observed the field of GRB 240204A (Fermi-GBM team GCN 35664, Cenko et al. GCN 35666, Pozanenko et al. GCN 35670,
Leonini et al. GCN 35672, P=C3=A9rez-Fournon et al. GCN 35673, Dainotti et
al. GCN 35677, Bochenek et al. GCN 35678) using the=20
T193cm telescope equiped with the MISTRAL instrument and with the T120cm telescope at Observatoire de Haute-Provence=20
(France). On the night of 04 February 2024, we made 9 sets of observations
with MISTRAL in r band (30min each) and two sets=20
of observations with the T120 telescope (V and i bands: 135min each). On the night of 05 February 2024, we made an=20
additional single set of observations with MISTRAL in r band during 97.5min.
Details are given in the table below.
All magnitudes were calibrated against the PanStarrs catalog (mean Kron magnitudes), extracted in a radius of 1arcmin around=20
the GRB position. Magnitudes were not corrected for galactic extinction.
Our results in r-band show a fading behaviour of typically 0.09+/-0.03 mag/hour over the 10 first hours and of 0.06+/-0.01 mag/hours over the 31 first
hours.
-----------------------------------------------
T-T0 (in hours) | mag | filter | Telescope
-----------------------------------------------
+4.09 | 21.82+/-0.21 | r | MISTRAL@T193
+4.70 | 21.88+/-0.15 | r | MISTRAL@T193
+5.29 | 21.86+/-0.11 | r | MISTRAL@T193
+5.89 | 21.92+/-0.12 | r | MISTRAL@T193
+6.64 | 21.77+/-0.10 | r | MISTRAL@T193
+7.22 | 21.98+/-0.10 | r | MISTRAL@T193
+7.99 | 21.88+/-0.12 | r | MISTRAL@T193
+8.69 | 22.10+/-0.13 | r | MISTRAL@T193
+9.32 | 22.51+/-0.31 | r | MISTRAL@T193
+30.72 | 23.37+/-0.31 | r | MISTRAL@T193
+6.02 | 22.69+/-0.17 | g | T120
+6.02 | 20.33+/-0.13 | i | T120
We acknowledge OHP staff for its excellent support during the AMU M2-Physics 2024 observationnal internship. This work=20
received support from the French government under the France2030 investment
plan, as part of the initiative d=E2=80=99Excellence=20
d=E2=80=99Aix-Marseille Universit=C2=B4e- A*MIDEX (AMX-19-IET-008). We were
also supported by the IPhU Graduate School program at=20
Aix-Marseille University. We also acknowledge the support by Master Erasmus
Mundus Europhotonics
(599098-EPP-1-2018-1-FR-EPPKA1-JMD-MOB) financed by EACEA (European Education and Culture Executive Agency).
- GCN Circular #35691
S. Belkin (IKI, HSE), N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko =
(IKI) report on behalf of IKI-GRB-FuN:
We observed the GRB 240204A (Fermi-GBM team GCN 35664, Cenko et al. GCN 35=
666, Pozanenko et al. GCN 35670, Leonini et al. GCN 35672, P=C3=A9rez-Fourn=
on et al. GCN 35673, Dainotti et al. GCN 35677, Bochenek et al. GCN 35678; =
Adami et al. GCN 35690) with AZT-33IK telescope of Mondy observatory star=
ting on 2024-02-04 (UT) 16:05:26 and 2024-02-05 (UT) 13:10:09. Preliminary=
photometry of the afterglow based on USNO-B1.0 (R2) nearby stars is follo=
wing
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2024-02-04 16:05:26 0.04292 R 480 19.90 0.10 21.9
2024-02-04 16:13:26 0.04847 R 480 20.01 0.11 21.8
2024-02-04 16:21:26 0.05403 R 480 19.93 0.10 21.9
2024-02-04 16:29:27 0.05959 R 480 19.85 0.09 21.8
2024-02-04 17:31:00 0.11345 R 2400 20.55 0.10 22.5
2024-02-05 13:10:09 0.96772 R 8400 22.4 0.2 23.1
- GCN Circular #35692
J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240204A which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 35664), and Swift (Cenko et al., GCN Circ. 35666).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-02-04 15:07:49.50 UTC. The measured peak count rate associated with the burst is 201 (+40 -25) counts/s above the background in the combined data of four quadrants, with a total of 1125 (+193 -176) counts. The local mean background count rate was 308 (+5 -6) counts/s. Using cumulative rates, we measure a T90 of 10.5 (+1.1 -2.5) s.
The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-02-04 15:07:49.4 UTC. The measured peak count rate associated with the burst is 388 (+65, -60) counts/s above the background in the combined data of all quadrants, with a total of 2008 (+336, -351) counts. The local mean background count rate was 1276 (+6, -6) counts/s. We measure a T90 of 8.5 (+3.1, -2.1) s from the cumulative Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb
- GCN Circular #35705
M. H. Siegel (PSU) and and S. B Cenko (GSFC) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 240204A
4.8 ks after the BAT trigger (Cenko et al., GCN Circ 35666). No optical
afterglow consistent with either the optical (Pozanenko et al., GCN
Circ. 35670) or X-ray (Beardmore et al., GCN Circ. 35671) position is
detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures of
the candidate afterglow field are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 5887 6087 196 >20.70
v 4862 6498 393 >19.32
b 5683 5882 196 >19.98
u 5477 28539 1048 >20.54
uvw1 5272 5472 196 >19.26
uvm2 5067 6669 360 >19.36
uvw2 6093 6293 196 >19.42
The magnitudes in the table are not corrected for the Galactic extinction
due to the high but uncertain reddening in the direction of the burst
(Schlegel et al. 1998).
- GCN Circular #35714
D. Svinkin, D. Frederiks, M. Ulanov, A. Tsvetkova,
A. Lysenko, A. Ridnaia, and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 240204A
(Fermi-GBM detection: The Fermi GBM team, GCN 35664;
Swift-BAt detection: Cenko et al., GCN 35666;
AstroSat-CZTI detection: Joshi et al., GCN 35692)
triggered Konus-Wind at T0=54473.519 s UT (15:07:53.519).
The burst light curve shows a single pulse
which starts at ~T0-4.5 s and has a total duration of ~21.5 s.
The emission is seen up to ~1 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB240204_T54473/
As observed by Konus-Wind, the burst
had a fluence of 1.37(-0.07,+0.07)x10^-5 erg/cm2,
and a 64-ms peak flux, measured from T0+2.448 s,
of 4.22(-1.15,+1.15)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+8.448 s)
is best fit in the 20 keV - 10 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.29(-0.16,+0.17)
and Ep = 81(-6,+6) keV (chi2 = 87/83 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -2.9
(chi2 = 86/82 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
- GCN Circular #35922
K. Smith (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (NASA), T. Lombardi (Eckerd College), K. Noonan (UVI), R. Querrard (UVI), D. Smith (UVI) report:
We observed the field of GRB240204A (Cenko et al., GCN 35666) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 02-05-2024 starting at 00:36:35 (T+10.04 hrs). We performed a series of exposures in an R filter with a total exposure of 4000s. The weather conditions were clear during the hours of observation with an average airmass of 1.08.
We do not detect any source within the enhanced XRT position (Beardmore et al. GCN 35671). This non-detection is consistent with the upper limits and detections of the faint optical transient reported by Master (Lipunov et al., GCN 35668), Mondy (Pozanenko et al., GCN 35670), Montarrenti Observatory (Leonini et al., GCN 35672), LCOGT (Perez-Fournon and Poidevin, GCN 35673), Osservatorio Nastro Verde (Ruocco et al., GCN 35677), Liverpool Telescope (Bochenek et al., GCN 35678), and Observatoire de Haute-Provence (Adami et al., GCN 35690). We report the following 3-sigma upper limit:
T_mid ||Exposure ||Filter ||Limit
T+ 10.04 hrs || 4000s || R || >20.9
The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase.
We acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001 and NASA EPSCoR award 80NNSC22M0063. R.Q and N.B.O also acknowledge financial support from South Carolina Space Grant award 80NSSC20M0054. This message can be cited.
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