TITLE: GCN CIRCULAR
NUMBER: 35625
SUBJECT: Fermi-LAT gamma-ray observations of IceCube-240123A
DATE: 24/01/25 07:57:28 GMT
FROM: chiara.bartolini-1(a)unitn.it
C. Bartolini (Univ of Trento & INFN Bari), S. Garrappa (Weizmann Institute of Science), S. Buson (Univ of Wuerzburg), L. Pfeiffer (Univ of Wuerzburg) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:
We report an analysis of observations of the vicinity of the IC240123A high-energy neutrino event (GCN 35604) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2024-01-23 at 11:25:36.05 UT (T0) with J2000 position RA = 357.54 (+1.93, -1.71)deg, Decl. = +4.26 (+0.80, -0.76)deg (90% PSF containment). According to the fourth Fermi LAT source catalog (4FGL-DR4), there are no 4FGL-DR4 cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources in the 90% IC240123A uncertainty localization region. The nearest 4FGL cataloged gamma-ray source is 4FGL J2349.4+0534 (TXS 2346+052) at 1.33deg away from the neutrino best-fit position. Based on a preliminary analysis of the LAT data over one month and day timescale prior T0, this object is not significantly detected at gamma rays.
We searched for intermediate (days to years) timescale emission from a new gamma-ray source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC240123A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240123A best-fit position, the >100 MeV flux upper limit (95% confidence) is <4.36e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2024-01-23 UTC), and <2.42e-9 (<9.60e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.
Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For this observation the Fermi-LAT contact person is C. Bartolini (chiara.bartolini at ba.infn.it).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35625.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35624
SUBJECT: GRB 240123A: further SAO RAS optical observations
DATE: 24/01/25 05:12:41 GMT
FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru>
A. S. Moskvitin, O. A. Maslennikova, O. I. Spiridonova (SAO RAS)
report on behalf of the GRB follow-up team.
We observed the field of GRB 240123A (D'Ai et al., GCN #35602;
Scotton, GCN #35610) with the 1-m telescope of SAO RAS equipped
with the CCD photometer. We obtained 16 x 300 sec. images in Rc
band on Jan 25, 01:55:52 -- 03:30:49 UT (t_mid - T0 = 1.6511 days).
The OT (D'Ai et al., GCN #35602; Pankov et al., GCNs #35605, #35609
#35620; Sasada et al., GCN #35618) is detected in our stacked frame
with the brightness of R = 22.0 +/- 0.2.
The photometry is based on R2 magnitudes of nearby USNO-B1.0 stars.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35624.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35623
SUBJECT: GRB 240122B: CALET Gamma-Ray Burst Monitor detection
DATE: 24/01/24 20:04:13 GMT
FROM: Yuta Kawakubo at Louisiana State University <kawakubo1(a)lsu.edu>
S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto,
S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),
S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike,
K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),
N. Cannady (GSFC/UMBC), M. L. Cherry (LSU),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 240122B (Glowbug gamma-ray detection:
Cheung et al., GCN Circ. 35606) triggered the CALET
Gamma-ray Burst Monitor (CGBM) at 19:16:26.96 UTC
on 22 January 2024
(http://cgbm.calet.jp/cgbm_trigger/flight/1389985993/).
The burst signal was seen by HXM2 and SGM.
The burst light curve shows a double-peaked structure that starts
at T-57.2 sec, peaks at T+9.0 sec, and ends at T+17.1 sec.
The T90 and T50 durations measured by the SGM data are
69.2 +/- 1.9 sec and 32.2 +/- 19.7 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1389985993/index.html
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35623.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35622
SUBJECT: GRB 240123A: Swift-BAT refined analysis
DATE: 24/01/24 18:12:15 GMT
FROM: Amy <yarleen(a)gmail.com>
T. Parsotan (GSFC), S. D. Barthelmy (GSFC),
A. D'Ai (INAF-IASFPA), 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. Sakamoto (AGU),
M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+820 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 240123A (trigger #1210276)
(D'Ai, et al., GCN Circ. 35602). The BAT ground-calculated position is
RA, Dec = 199.287, 60.607 deg which is
RA(J2000) = 13h 17m 08.9s
Dec(J2000) = +60d 36' 25.6"
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 31%.
The mask-weighted light curve shows some weak emission with complex
structures
that starts at ~T0 and ends at ~T+140 s. The main peak occurs at ~T+5 s.
T90 (15-350 keV) is 115.30 +- 54.93 sec (estimated error including
systematics).
The time-averaged spectrum from T-0.69 to T+140.46 sec is best fit by a
simple
power-law model. The power law index of the time-averaged spectrum is
1.69 +- 0.23. The fluence in the 15-150 keV band is 1.6 +- 0.2 x 10^-6
erg/cm2.
The 1-sec peak photon flux measured from T+5.49 sec in the 15-150 keV band
is 1.1 +- 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/1210276/BA/
View this GCN Circular online at https://gcn.nasa.gov/circulars/35622.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35621
SUBJECT: IceCube Alert 240123.48: Global MASTER-Net observations report
DATE: 24/01/24 17:13:28 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the IceCube Alert 240123.48 (trigger No 34080563,23h 50m 33.12s , +04d 22m 12.0s, R=0.51) errorbox 26249 sec after notice time and 26305 sec after trigger time at 2024-01-23 18:44:01 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 71 deg. The sun altitude is -11.7 deg.
MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 240123.48 errorbox 1 days 19825 sec after notice time and 1 days 19881 sec after trigger time at 2024-01-24 16:56:57 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 65 deg. The sun altitude is -30.1 deg.
The galactic latitude b = -55 deg., longitude l = 97 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2363232
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
26336 | 2024-01-23 18:44:01 | MASTER-SAAO | (23h 57m 38.77s , +04d 59m 29.0s) | C | 60 | 16.2 |
26336 | 2024-01-23 18:44:01 | MASTER-SAAO | (23h 59m 26.43s , +04d 46m 52.8s) | C | 60 | 16.3 |
27297 | 2024-01-23 19:00:02 | MASTER-SAAO | (23h 59m 37.22s , +04d 49m 10.8s) | C | 60 | 16.8 |
106312 | 2024-01-24 16:56:57 | MASTER-Kislovodsk | (23h 56m 37.15s , +05d 21m 39.6s) | C | 60 | 17.5 |
106393 | 2024-01-24 16:58:18 | MASTER-Kislovodsk | (23h 54m 43.10s , +04d 59m 36.3s) | C | 60 | 17.1 |
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/35621.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35620
SUBJECT: GRB 240123A: Mondy continued optical observations and the PL decay index
DATE: 24/01/24 15:44:05 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen(a)iki.rssi.ru>
N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN:
We continued to observe the afterglow of GRB 240123A (D'Ai et al., GCN 35602; Pankov et al., GCN 35605, GCN 35609; Sasada et al., GCN 35618; Moskvitin at al., GCN 35619) with AZT-33IK telescope of Mondy observatory in R-filter.
Using previously reported photometry (Pankov et al., GCN 35605, GCN 35609; Moskvitin at al., GCN 35619) and photometry obtained on t-T0 0.400722 we approximate the light curve with a PL model with the index of PL alpha = -1.1, see Figure at
http://grb.rssi.ru/GRB240123A/GRB240123A_LC_approximation.jpg
View this GCN Circular online at https://gcn.nasa.gov/circulars/35620.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35619
SUBJECT: GRB 240123A: SAO RAS optical observations
DATE: 24/01/24 11:10:25 GMT
FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru>
A. S. Moskvitin, O. A. Maslennikova, O. I. Spiridonova (SAO RAS)
report on behalf of the GRB follow-up team.
We observed the field of GRB 240123A (D'Ai et al., GCN #35602;
Scotton, GCN #35610) with the 1-m telescope of SAO RAS equipped
with the CCD photometer. We obtained 12 x 300 sec. images in Rc
band on Jan 24, 02:15:54 -- 03:42:02 UT (t_mid - T0 = 0.66194 days).
The OT (D'Ai et al., GCN #35602; Pankov et al., GCNs #35605, #35609;
Sasada et al., GCN #35618) is clearly detected in our stacked frame
with the brightness of R = 21.12 +/- 0.09.
The photometry is based on R2 magnitudes of nearby USNO-B1 stars.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35619.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35618
SUBJECT: GRB 240123A : MITSuME Akeno optical afterglow candidate detection
DATE: 24/01/24 08:57:45 GMT
FROM: Mahito Sasada at Tokyo Institute of Technology <sasada(a)hp.phys.titech.ac.jp>
M. Sasada, I. Takahashi, N. Higuchi, M. Niwano, S. Sato, S. Hayatsu, H. Takei, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 240123A (D'Ai et al. GCN 35602) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno.
The observation with a series of 60 sec exposures started at 2024-01-23 15:09:01 UT (4.05 hours after the Swift/BAT trigger). We stacked the images in good conditions. An optical candidate of the afterglow can be found at the location of (RA, Dec) = (199.3495, 60.6181) near the Swift/XRT error position (Capalbi et al. GCN 35612). Here we report magnitudes by the aperture photometry at the position.
T0+[hours] | MID-UT | T-EXP[sec] | magnitudes of aperture photometry
----------------------------------------------------------------------------------------------------------------
5.0 | 2024-01-23 16:05:41 | 5880 | g’=19.83+/-0.17, Rc=19.35+/-0.11, Ic=19.24+/-0.13
----------------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the trigger
T-EXP: Total Exposure time
The position of the optical candidate is consistent with Pankov et al., GCN 35605.
We used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g'-, Rc- and Ic-band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
View this GCN Circular online at https://gcn.nasa.gov/circulars/35618.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35617
SUBJECT: Fermi/GBM trigger 727752941: BALROG analysis retraction
DATE: 24/01/24 08:05:14 GMT
FROM: Jochen Greiner at MPE <jcg(a)mpe.mpg.de>
J. Greiner, T. Preis (both MPE) report:
Due to a programming error the auto-generated draft text was sent out to the
world (GCN 35615), despite the obvious solar flare like light curve and
spectrum, i.e. trigger 727752941 is a solar flare, and not a GRB. We apologize
for our mistake.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35617.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 35616
SUBJECT: GRB 240123A: Enhanced Swift-XRT position
DATE: 24/01/24 03:40:02 GMT
FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk>
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 596 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 240123A, 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 = 199.34861, +60.61849 which is equivalent
to:
RA (J2000): 13h 17m 23.67s
Dec (J2000): +60d 37' 06.6"
with an uncertainty of 2.1 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/35616.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…