TITLE: GCN CIRCULAR
NUMBER: 35406
SUBJECT: GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position
DATE: 23/12/20 12:59:48 GMT
FROM: Karelle Siellez at University of Tasmania <karelle.siellez(a)utas.edu.au>
K. Siellez, B. Emptage, K. Hill, J.-P. Beaulieu (Institute of Astrophysics in Paris / UTas), A. Cole, T. Plunkett report:
a new optical transient for the GRB 231210B observed with the Harlingten 50cm Telescope starting on 2023-12-11 17:14:35 UT in Sloan r' and g' filters.
We detect an optical transient at the position RA (J2000) = 06h 23m 05.924s, Dec (J2000) = -48d 19' 11.65", which is not included in the Swift XRT position (Page et al., GCN 35314), but is within the BAT enhanced ground-calculated position (Sakamoto et al., GCN 35322). It has a different position than the optical afterglows already published (GCN 35316, GCN 35323).
The observations leading to the measurements of the magnitude were made as followed:
Date Time Filter Exposure (sec)
-------------------------|-----------|-----------------------------------
2023-12-11 17:14:35.536 r 180
2023-12-11 17:17:44.365 r 180
2023-12-11 17:20:53.192 r 180
2023-12-11 17:24:02:021 r 180
2023-12-11 17:27:10.853 r 180
On 2023-12-11 we stacked 5 pictures of 180s exposure time for a total of 900s exposure time, with r' filter. We obtain a magnitude of 19.2 +/- 0.1 in r'.
Date Time Filter Exposure (sec)
-------------------------|-----------|-----------------------------------
2023-12-12 11:49:41.012 g' 180
2023-12-12 11:52:49.835 g' 180
2023-12-12 11:55:58.661 g' 180
2023-12-12 11:59:07.480 g' 180
2023-12-12 12:05:25.121 g' 180
On 2023-12-12 we stacked 5 pictures of 180s exposure time for a total of 900s exposure time, with g' filter. We obtain a magnitude of 20.3 +/- 0.1 in g'.
On 2023-12-17 we stacked 5 pictures of 180s exposure time for a total of 900s exposure time, with r' filter. We obtain a magnitude of 20.1 +/- 0.1 in r'.
More data were taken on the days in between and will be released soon. We encourage the follow up of this optical transient in all wavelengths.
We acknowledge the traditional custodians of the land upon which we built our telescope: the Palawa / Pakana and Gadigal people. The team wants to thank Caisey Harlingten for his donation and support, the late Dr. John Greenhill who created and pushed forward the development of this optical observatory, as well as Dr. Tony Sprent and Dr. Keith Bolton, who keep supporting and developing the telescopes.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35406.
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TITLE: GCN CIRCULAR
NUMBER: 35405
SUBJECT: Fermi trigger No 724698747: Global MASTER-Net observations report
DATE: 23/12/19 20:30:38 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru>
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB231219.72 (trigger No 724698747,15h 26m 33.60s , +58d 00m 00.0s, R=14.25) errorbox 10878 sec after notice time and 10910 sec after trigger time at 2023-12-19 20:14:13 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 80 deg. The sun altitude is -63.0 deg.
MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB231219.72 errorbox 11399 sec after notice time and 11431 sec after trigger time at 2023-12-19 20:22:53 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 62 deg. The sun altitude is -43.0 deg.
The galactic latitude b = 49 deg., longitude l = 92 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2337422
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
10940 | 2023-12-19 20:14:13 | MASTER-Tavrida | (16h 53m 20.35s , +56d 06m 31.3s) | C | 60 | 16.5 |
11461 | 2023-12-19 20:22:53 | MASTER-Tunka | (17h 13m 36.54s , +56d 07m 11.7s) | C | 60 | 18.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35405.
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TITLE: GCN CIRCULAR
NUMBER: 35403
SUBJECT: GRID detection of GRB 231205B
DATE: 23/12/19 12:35:19 GMT
FROM: GRID Student Team at Tsinghua University <grid(a)tsinghua.edu.cn>
Chenyu Wang, Zirui Yang and Longhao Li report on behalf of the GRID Collaboration:
GRID-03B and GRID-04, onboard the same CubeSat, report the detection of the long-duration GRB 231205B, which was also detected by Swift/BAT, GECAM-B, and AGILE(GCN Circular 35269, 35279, 35295).
The event was triggered with GRID on 2023-12-05 at 16:43:49 UTC. The GRID light curve shows a double-pulse temporal structure. The measured burst duration (T90) in the 30-2000 keV range is approximately 40.2 ± 3.0 seconds.
The GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231205B/GRID_231….
GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35403.
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TITLE: GCN CIRCULAR
NUMBER: 35402
SUBJECT: GRID detection of GRB 231205A
DATE: 23/12/19 12:34:43 GMT
FROM: GRID Student Team at Tsinghua University <grid(a)tsinghua.edu.cn>
Chenyu Wang, Zirui Yang, Longhao Li and Songyu Shen report on behalf of the GRID Collaboration:
GRID-07 reports the detection of the short-duration GRB 231205A, which was also detected by Fermi/GBM and GECAM-B(GCN Circular 35263, 35266).
The event was triggered with GRID on 2023-12-05 at 02:25:11.2 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 0.4 ± 0.1 seconds.
The GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231205A/GRID_231….
GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35402.
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TITLE: GCN CIRCULAR
NUMBER: 35401
SUBJECT: GRB 231216A: GAD Observatory, La Spezia, Italy upper limit
DATE: 23/12/19 11:33:18 GMT
FROM: Claudio Lopresti <cl3lop(a)gmail.com>
Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy)
Member of:
UAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section.
GAD - Gruppo Astronomia Digitale.
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), Unione Astrofili Italiani (UAI)
report:
We imaged the field of GRB 231216A detected by SWIFT(trigger 1202749)
with the telescope LX200 12” of GAD Observatory, La Spezia, Italy
The observations with a series of 60 sec exposures started at 2023-12-16 23:14:43 UT, 261 min. after the GRB trigger,with a Shmidt-Cassegrain telescope D=304 mm with reducer F/D=4.75.
at the following position (+/- 2 arcsec):
RA (J2000): 02 39 05.45
Dec(J2000): +33 34 35.0
scope D=300 mm F/D=4.8.
Weather conditions were medium.
We co-added 75 exposures of 60 sec each.
Start T0+ End T0+ R lim
261 min 341 min 18
We did not found any optical counterpart in 02 39 05.45 +33 34 35.0 position and in the error box of the XRT candidate.
ref.: T. Sbarrato et al. GCN 35378
Magnitudes were estimated with the Gaia EDR3 cat. and
are not corrected for galactic dust extinction.
Reference:
https://www.parcodellestelle.com/
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35401.
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TITLE: GCN CIRCULAR
NUMBER: 35400
SUBJECT: GRB 231214B: Fermi GBM observation
DATE: 23/12/19 08:42:25 GMT
FROM: Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi(a)ba.infn.it>
E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 07:53:55.52 UT on 14 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 231214B (trigger 724233240 / 231214329),
which was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2023, GCN 35340).
The on-ground calculated location, using the GBM trigger
data, is RA = 137.9, DEC = -13.4 (J2000 degrees,
equivalent to 09h 11m 36, -13d 24'), with a statistical uncertainty
of 6.3 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).
The angle from the Fermi LAT boresight at the GBM trigger time is 78 degrees.
The GBM light curve shows a single weak and structured emission episode
with a duration (T90) of about 39 s (50-300 keV).
The time-averaged spectrum from T0-2 s to T0+39 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is 0.30 +/- 0.19 and
the cutoff energy, parameterized as Epeak, is 148 +/- 15 keV.
The event fluence (10-1000 keV) in this time interval is
(3.02 +/- 0.24)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0 in the 10-1000 keV band
is 1.56 +/- 0.17 ph/s/cm^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/"
View this GCN Circular online at https://gcn.nasa.gov/circulars/35400.
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TITLE: GCN CIRCULAR
NUMBER: 35399
SUBJECT: GRB 231216A: optical upper limits from the INAF Asiago Observatory
DATE: 23/12/18 16:58:09 GMT
FROM: Paolo D'Avanzo at INAF-OAB <pda.davanzo(a)gmail.com>
A. Reguitti (INAF-OAB / INAF-OAPd), P. D'Avanzo (INAF-OAB), I. Salmaso (INAF -OAPd), E. Cappellaro (INAF -OAPd),
report on behalf of the CIBO and of the GRAWITA collaborations:
We observed the field of GRB 231216A (Sbarrato et al., GCN Circ. 35378) from the INAF - Padova Astronomical Observatory
located in Asiago (Italy) with the 1.8m Copernico telescope starting on 2023-12-16 at 20:24:48 UT (~ 1.8 hours after the burst).
The observations have been carried out with the AFOSC camera in imaging mode using the r filter.
No optical afterglow candidate is detected within the XRT error circle (Sbarufatti et al., GCN Circ .35391) down to a 3sigma
limiting magnitude of r ~ 22.0 (AB; calibrated against the PanSTARRS catalogue).
View this GCN Circular online at https://gcn.nasa.gov/circulars/35399.
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TITLE: GCN CIRCULAR
NUMBER: 35398
SUBJECT: GRB 231216A: 10.4 m GTC optical upper limit
DATE: 23/12/18 15:52:04 GMT
FROM: Youdong HU at IAA-CSIC <huyoudong072(a)hotmail.com>
Y.-D. Hu, R. Sanchez-Ramirez, A. J. Castro-Tirado, S. Guziy, M.D. Caballero-Garcia, S.-Y. Wu, E. Fernandez-Garcia, and I. Perez-Garcia (IAA-CSIC), F. Pérez-Toledo (GTC, IAC), S. B. Pandey (ARIES) and B.-B. Zhang (NJU) on behalf of a larger collaboration, report:
Following the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378), we triggered the 10.4m Gran Telescopio de Canarias (GTC) equipped with Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) in La Palma (Spain), starting on Dec 16, 20:18 UT (~1.7 h after the trigger). No optical afterglow is indentified within the refined Swift/XRT posiion (Sbarufatti et al. GCNC 35391) which down to i>24.5 mag, which is consistent with these reports from UVOT (Kuin et al., GCNC 35388), MASTER (Lipunov et al. GCNC 35379), NOT (Malesani et al. GCNC 35382), GIT (Sharma et al. GCNC 35383), T120 (Basa et al. GCNC 35384), REM (Ferro et al. GCNC 35389), AST-3 (Sun et al. GCNC 35390), Nastro Verde Observatory (Ruocco et al. GCNC 35394), LCOGT (Strausbaugh et al. GCNC 35395) and Nanshan/HMT (An et al. GCNC 35396).
We thank the staff at GTC for their excellent support.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35398.
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TITLE: GCN CIRCULAR
NUMBER: 35397
SUBJECT: GRB 231215A: AMI-LA radio detection
DATE: 23/12/18 15:27:07 GMT
FROM: Lauren Rhodes at Oxford <lauren.rhodes(a)physics.ox.ac.uk>
Lauren Rhodes, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:
We observed the field of the afterglow candidate GRB 231215A (GCN 35343) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 19:57:45 on 17-Dec-2023 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J0102+5824 was used as an interleaved complex gain calibrator.
We detect an unresolved radio source at the position of the afterglow candidate as reported in GCN 35345 with a flux density of ~220uJy/beam.
Further observations are planned. We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35397.
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