TITLE: GCN CIRCULAR
NUMBER: 35455
SUBJECT: GRB 240101B: Enhanced Swift-XRT position
DATE: 24/01/02 10:15:22 GMT
FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk>
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1510 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 240101B, 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 = 352.09572, +51.63617 which is equivalent
to:
RA (J2000): 23h 28m 22.97s
Dec (J2000): +51d 38' 10.2"
with an uncertainty of 2.2 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.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35455.
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TITLE: GCN CIRCULAR
NUMBER: 35454
SUBJECT: GRB 240101B: KAIT Optical Upper Limit
DATE: 24/01/02 07:23:47 GMT
FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu>
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on
behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, responded to Swift GRB 240101B (Cenko et al.,
GCN 35449) starting at 7.38 hours after the burst. A total of
31x60s images were obtained in the clear (roughly R) filters.
We do not detect any optical afterglow candidate within the XRT
position error circle (Cenko et al., GCN 35449), neither in single
image, nor in the co-add images. The typical limiting magnitude of
our single clear image is about 18.5 mag calibrated to the PS1 catalog.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35454.
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TITLE: GCN CIRCULAR
NUMBER: 35453
SUBJECT: GRB 240101A: KAIT Optical Upper Limit
DATE: 24/01/02 07:21:22 GMT
FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu>
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on
behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, responded to Swift GRB 240101A (Cenko et al.,
GCN 35448) starting at 15.57 hours after the burst. A total of
31x60s images were obtained in the clear (roughly R) filters.
We do not detect any optical afterglow candidate within the Enhanced
XRT position error circle (Beardmore et al., GCN 35452), neither in
single image, nor in the co-add images. The typical limiting magnitude
of our single clear image is about 18.5 mag calibrated to the PS1 catalog.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35453.
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TITLE: GCN CIRCULAR
NUMBER: 35452
SUBJECT: GRB 240101A: Enhanced Swift-XRT position
DATE: 24/01/02 04:21:50 GMT
FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk>
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 885 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 240101A, 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 = 10.34841, +8.51582 which is equivalent
to:
RA (J2000): 00h 41m 23.62s
Dec (J2000): +08d 30' 57.0"
with an uncertainty of 2.2 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.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35452.
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TITLE: GCN CIRCULAR
NUMBER: 35450
SUBJECT: Swift GRB240101.85: Global MASTER-Net observations report
DATE: 24/01/01 22:12:46 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) was pointed to the Swift GRB240101.85 (trigger No 1205744,23h 28m 12.48s , +51d 38m 42.0s, R=0.05) errorbox 2999 sec after notice time and 3077 sec after trigger time at 2024-01-01 21:16:57 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 63 deg. The sun altitude is -68.2 deg.
The galactic latitude b = -9 deg., longitude l = 110 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2348073
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
3168 | MASTER-Tavrida | C | 180 | 14.8 |
5973 | MASTER-Tavrida | C | 180 | 16.5 |
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/35450.
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TITLE: GCN CIRCULAR
NUMBER: 35449
SUBJECT: GRB 240101B: Swift detection of a burst
DATE: 24/01/01 20:42:28 GMT
FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk>
S. B. Cenko (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU),
H. A. Krimm (NSF), A. Y. Lien (U Tampa) and K. L. Page (U Leicester)
report on behalf of the Neil Gehrels Swift Observatory Team:
At 20:25:39 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 240101B (trigger=1205744). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 352.052, +51.645 which is
RA(J2000) = 23h 28m 12s
Dec(J2000) = +51d 38' 43"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a complex
structure with a duration of about 20 sec. The peak count rate
was ~600 counts/sec (15-350 keV), at ~7 sec after the trigger.
The XRT began observing the field at 20:27:43.2 UT, 123.9 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 352.0966, 51.6379 which is equivalent to:
RA(J2000) = 23h 28m 23.18s
Dec(J2000) = +51d 38' 16.4"
with an uncertainty of 5.1 arcseconds (radius, 90% containment). This
location is 102 arcseconds from the BAT onboard position, within the
BAT error circle.
The initial flux in the 2.5 s image was 2.19e-09 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 134 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of
the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
XRT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.286.
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/)
View this GCN Circular online at https://gcn.nasa.gov/circulars/35449.
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TITLE: GCN CIRCULAR
NUMBER: 35448
SUBJECT: GRB 240101A: Swift detection of a burst
DATE: 24/01/01 14:45:57 GMT
FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk>
S. B. Cenko (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU) and
K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift
Observatory Team:
The Swift Burst Alert Telescope (BAT) triggered and located GRB 240101A
(trigger=1205708), and Swift has slewed to this burst. The trigger time is
believed to be no earlier than 12:52 UT. Given the loss of some of the TDRSS
notices, we will not have values for T0 or the BAT Position until the
full data have been downloaded, in approximately 1.25 hours (by around 16:05
UT).
Using promptly downlinked data we find an uncatalogued X-ray source
with an enhanced position: RA, Dec 10.34819, 8.51706 which is
equivalent to:
RA(J2000) = 00h 41m 23.57s
Dec(J2000) = +08d 31' 01.4"
with an uncertainty of 1.9 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 in excess of the Galactic value (5.84 x
10^20 cm^-2, Willingale et al. 2013), with an excess column of 1.1
(+0.67/-0.52) x 10^22 cm^-2 (90% confidence).
No afterglow is detected in the initial UVOT data products.
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/)
View this GCN Circular online at https://gcn.nasa.gov/circulars/35448.
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