TITLE: GCN CIRCULAR
NUMBER: 35396
SUBJECT: GRB 231216A: Nanshan/HMT optical upper limit
DATE: 23/12/18 14:59:03 GMT
FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn>
J. An, S.Y. Fu, S.Q. Jiang, X. Liu, Z.P. Zhu, T.H. Lu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 231216A detected by Swift (Sbarrato et al., GCN 35378) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 18:42:32 UT on 2023-12-16, i.e., 6.83 mins after the Swift/BAT trigger, and a series of 20, 40, 60, 90, 120, 200 s frames were obtained without any filter.
No optical source is detected in our stacked image at the XRT position (Sbarrato et al., GCN 35378), down to the 3-sigma limiting magnitude of m(r) > 20.2 mag (AB) @ 26.03 mins post-burst, calibrated with the nearby PanSTAR field in the Sloan r-filter. The magnitude is not corrected for Galactic extinction.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35396.
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TITLE: GCN CIRCULAR
NUMBER: 35395
SUBJECT: GRB 231216A: LCOGT Optical Upper Limits
DATE: 23/12/18 14:33:54 GMT
FROM: Robert Strausbaugh at Eastern Illinois University <rstrausbaugh(a)eiu.edu>
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the Swift GRB 231216A (Sbarrato et al., GCN 35378) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on December 16, from 19:08 to 19:41 UT (corresponding to 0.55 to 1.10 hours after the GRB trigger time) with the sdss r and i filters.
We performed a series of 3x300s exposures in each band. We do not detect an uncataloged source within the XRT error region in either band. This result is consistent with other optcal upper limits (Hu et al., GCN 35381; Malesani et al., GCN 35382; Sharma et al., GCN 35383; Basa et al., GCN 35384; Kuin et al., GCN 35388; Sun et al., GCN 35390; Ruocco et al., 35394).
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
r > 22.7
i > 22.1
These magnitudes are not corrected for galactic extinction.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35395.
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TITLE: GCN CIRCULAR
NUMBER: 35394
SUBJECT: GRB 231216A: Osservatorio Astronomico Nastro Verde upper limit
DATE: 23/12/17 20:06:20 GMT
FROM: Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde(a)gmail.com>
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 231216A detected by Swift Burst Alert Telescope (BAT)(trigger 1202749)
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 20:15 UT of 2023/12/16, after 1,40 hours after the GRB trigger, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME
I took 20 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software
We have not detected any clearly visible sources, up to 19.5th magnitude in a sky with light clouds and gusts of wind.
Start T0+ End T0+ Rlim
20:15:25 UT 20:36:38 UT 19.5
We did not found any optical counterpart in the error box of the XRTcandidate.
T. Sbarrato et al. GCN 35378
Magnitudes were estimated with the Gaia DR2 cat. and
are not corrected for galactic dust extinction.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35394.
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TITLE: GCN CIRCULAR
NUMBER: 35393
SUBJECT: GRB 231216A: Swift-XRT refined analysis correction
DATE: 23/12/17 19:53:03 GMT
FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk>
K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
GCN Circular 35391 omitted the uncertainties on the light curve power-law
decay for the Swift-XRT data. The correct value is a decay index of
alpha=0.72 (+0.11, -0.09).
If the light curve continues to decay with a power-law decay index of
0.72, the count rate at T+24 hours will be 4.8 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-13
(2.8 x 10^-13) erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35393.
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TITLE: GCN CIRCULAR
NUMBER: 35392
SUBJECT: GRB 231215A: Osservatorio Astronomico Nastro Verde upper limit
DATE: 23/12/17 19:52:34 GMT
FROM: Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde(a)gmail.com>
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 231215A detected by Swift Burst Alert Telescope (BAT)(trigger 1202522)
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 16:28 UT of 2023/12/15, after 6,40 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 20 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software
We have not detected any clearly visible sources, up to 20th magnitude with clear skies.
Start T0+ End T0+ Rlim
16:28:50 UT 17:08:29 UT 20
We did not found any optical counterpart in the error box of the XRTcandidate.
P. D'Avanzo et al. GCN 35343
Magnitudes were estimated with the Gaia DR2 cat. and
are not corrected for galactic dust extinction.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35392.
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TITLE: GCN CIRCULAR
NUMBER: 35391
SUBJECT: GRB 231216A: Swift-XRT refined Analysis
DATE: 23/12/17 19:18:04 GMT
FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk>
B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB),
J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore
(U. Leicester), J.P. Osborne (U. Leicester) and P.A. Evans report on
behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 231216A, from 115 s to 68.0
ks after the BAT trigger. The data comprise 8 s in Windowed Timing
(WT) mode (taken while Swift was slewing), with the remainder in Photon
Counting (PC) mode. The refined XRT position is RA, Dec = 39.7727,
+33.5764 which is equivalent to:
RA (J2000): 02 39 05.45
Dec(J2000): +33 34 35.0
with an uncertainty of 3.9 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.7 (+nan, -nan).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.1 (+0.4, -0.3). The
best-fitting absorption column is 3.2 (+1.7, -1.4) x 10^21 cm^-2, in
excess of the Galactic value of 8.4 x 10^20 cm^-2 (Willingale et al.
2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.7 x 10^-11 (5.7 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 3.2 (+1.7, -1.4) x 10^21 cm^-2
Galactic foreground: 8.4 x 10^20 cm^-2
Excess significance: 2.8 sigma
Photon index: 2.1 (+0.4, -0.3)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01202749.
This circular is an official product of the Swift-XRT team.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35391.
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TITLE: GCN CIRCULAR
NUMBER: 35390
SUBJECT: GRB 231216A: AST3-3 YaoAn Optical Upper Limit
DATE: 23/12/17 15:05:33 GMT
FROM: Tianrui Sun at Purple Mountain Obs,CAS <trsun(a)pmo.ac.cn>
Tian-Rui Sun (Purple Mountain Observatory), Yan-Long Hua, Mao-Kai Hu, Xue-Feng Wu, Lei Liu, Ke-Lai Meng, Xiao-Yan Li (Nanjing Institute of Astronomical Observation Technology),
Xiang-Yan Yuan, Lifan Wang (TAMU), Xiao-Feng Wang (Tsinghua University), Lei Hu (CMU) report on behalf the AST3 Team:
Following the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378),
we use Antarctic Survey Telescope 3-3 at YaoAn Astronomy Observation Station (China, Yunnan) for follow-up.
Our observation started on 2023-12-16T18:44:08 (about 506 seconds after the trigger of BAT (Sbarrato et al., GCNC 35378)).
No optical source was detected within the XRT error box down to 20.7 mag in the coadded image (total 600s, g-band).
Our non-detection is consistent with the results from the UVOT (Sbarrato et al., GCN 35378), MASTER (Lipunov et al. GCN 35379),
the BOOTES-2/TELMA (Hu et al. GCN 35381), NOT (Daniele B. Malesani et al., GCN 35382) and the T120 at Observatoire de Haute-Provence (Basa et al., GCN 35384)limits.
We thank the staff at YaoAn Astronomy Observation Station for their excellent support.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35390.
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TITLE: GCN CIRCULAR
NUMBER: 35389
SUBJECT: GRB 231216A: REM NIR upper limits
DATE: 23/12/17 13:53:14 GMT
FROM: Matteo Ferro <matteo.ferro(a)inaf.it>
M. Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:
We observed the field of GRB 231216A (Sbarrato et al., GCN 35378) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g,r,i,z, J,H,K bands, starting on 2023 Dec 17 at 00:40:48 UT (i.e. about 6.09 hours after the Swift trigger) and lasted for about 1 hour.
From preliminary analysis, we do not find any source at the XRT position (Sbarrato et al., GCN 35378), down the the following 3 sigma upper limits:
H > 16.7 (Vega; calibrated against the 2MASS catalogue)
at a mid time of t-t0 ~ 6.52 h after the GRB trigger;
K > 16.3 (Vega; calibrated against the 2MASS catalogue)
at a mid time of t-t0 ~ 6.61 h after the GRB trigger.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35389.
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TITLE: GCN CIRCULAR
NUMBER: 35388
SUBJECT: GRB 231216A: Swift/UVOT Upper Limits
DATE: 23/12/17 10:03:34 GMT
FROM: Paul Kuin at MSSL <npkuin(a)gmail.com>
N. P. M. Kuin (UCL-MSSL) and Sbarrato (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 231216A
191 s after the BAT trigger (Sbarrato et al., GCN Circ. 35378).
No optical afterglow consistent with the XRT position was 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 first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
u_FC 191 441 246 >20.2
v 497 814 58 >18.5
b 447 1028 63 >20.0
u 191 1018 432 >20.8
w1 546 864 58 >19.5
m2 819 839 19 >18.3
w2 473 790 58 >19.6
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.082 in the direction of the burst
(Schlegel et al. 1998).
View this GCN Circular online at https://gcn.nasa.gov/circulars/35388.
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TITLE: GCN CIRCULAR
NUMBER: 35387
SUBJECT: GRB 231216A: Swift-BAT refined analysis
DATE: 23/12/17 05:01:41 GMT
FROM: Takanori Sakamoto at AGU <tsakamoto(a)phys.aoyama.ac.jp>
H. A. Krimm (NSF), S. D. Barthelmy (GSFC), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. Moss (GSFC),
D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),
T. Sbarrato (INAF-OAB), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 231216A (trigger #1202749)
(Sbarrato, et al., GCN Circ. 35378). The BAT ground-calculated position is
RA, Dec = 39.778, 33.614 deg which is
RA(J2000) = 02h 39m 06.6s
Dec(J2000) = +33d 36' 48.9"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 59%.
The mask-weighted light curve shows a structure of multiple pulses.
The emission starts from T-5 s, peaks at T0 and ends at T+60 s.
T90 (15-350 keV) is 51.2 +- 3.1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.12 to T+51.39 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.63 +- 0.20. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-0.51 sec in the 15-150 keV band
is 1.8 +- 0.3 ph/cm2/sec. 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/1202749/BA/
View this GCN Circular online at https://gcn.nasa.gov/circulars/35387.
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