GRB 241128A
GCN Circular 39271
Subject
GRB 241128A: VIRT Optical Upper Limit
Date
2025-02-10T20:27:27Z (8 months ago)
From
Priya Gokuldass at ERAU <gokuldap@my.erau.edu>
Via
Web form
R. Querrard (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), B. Gendre (UVI), D. Morris (NASA), T. Lombardi (Eckerd College), F. George (ERAU), D. Smith (UVI), K. Smith (UVI), C. Watson (UVI) report:
We observed the field of GRB241128A (Brivio et al., GCN 38367) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2024-11-29 starting at 22:47:51.703 (T-mid ~ T0 + 30.75 hrs). We performed a series of exposures in an R filter with a total exposure of 1370s. The weather conditions were partly cloudy during the hours of observation with an average airmass of 2.94.
We do not detect any source within the enhanced XRT position (Beardmore et al. GCN 38374). This non-detection is consistent with reported detections (Hu et al., GCN 38371;Izzo et al., GCN 38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382; Pankov et al., GCN 38383; Midavaine et al., GCN 38438; and Volnova et al., GCN 38519 ) and upper limits (Lipunov et al., GCN 38380; Shilling et al., GCN 38422; Akl et al., GCN 38382; Pankov et al., GCN 38395; Midavaine et al., GCN 38438; and Volnova et al., GCN 38519 ). We report the following 3-sigma upper limit:
T_mid ||Exposure ||Filter ||Limit
T+30.75 hrs || 1370 s || R || > 18.6
The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction.
We acknowledge financial support from NASA EPSCoR award 80NNSC22M0063, NSF PAARE award 2319415, and NASA EPSCoR award 80NSSC24M0112. This message can be cited.
GCN Circular 38519
Subject
GRB 241128A: CrAO ZTSh and Mondy AZT-33IK optical observations
Date
2024-12-10T09:57:54Z (10 months ago)
From
Nicolai Pankov at HSE, IKI RAS <colinsergesen@gmail.com>
Via
Web form
A. Volnova (IKI), N. Pankov (HSE, IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO), E. Klunko (ISTP) report on behalf of IKI-GRB-FuN:
We continued observations of the GRB 241128A (Brivio et al., GCN 38367; Page, GCN 38368) with 2.6-meter ZTSh telescope of CrAO observatory and 1.5-meter AZT-33IK telescope of Sayan observatory (Mondy). The optical afterglow (Hu et al., GCN 38371; Izzo and Malesani, GCN 38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382; Pankov et. al, GCN 38383, GCN 38395; Shilling & Brivio, GCN 38422; Midavaine et. al, GCN 38438) is well detected in the stacked images from ZTSh on both epochs of 2024-11-30 and 2024-12-01. Preliminary photometry is given below:
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) Telescope
(mid, days) (s)
2024-11-30 17:38:32 2.066296 11*120 R 22.03 0.14 23.1 ZTSh
2024-12-01 10:31:12 2.793500 46*120 R n/d n/d 21.9 AZT-33IK
2024-12-01 15:19:05 3.000058 48*120 R 23.12 0.11 24.0 ZTSh
The magnitudes were calibrated against nearby PS1 stars (R magnitudes obtained with Lupton transformations) and not corrected for the Galactic extinction. Using the current photometry and our photometry reported previously (Pankov et. al, GCN, 38383) we found that the light curve is well fitted with a simple power-law model with an index of -2.2.
GCN Circular 38438
Subject
GRB 241128A : RAPAS follow-up observations
Date
2024-12-04T11:08:56Z (a year ago)
From
Thierry Midavaine at GRANDMA <thierrymidavaine@sfr.fr>
Via
Web form
Thierry Midavaine on behalf of the RAPAS network reports (#3) :
Cédric Latgé, Patrick Martinez [1], Pierre-Michel Bergé, Erik Guthleben, Patrick Martinez [2], Thierry Midavaine [3] observed the Gamma-Ray Burst GRB241128A (R. Brivio et al. GCN 38367, K.L. Page GCN 38368) using [1][2] ADAGIO N 820mm telescope f=3.1m at Belesta Observatory (IAU A05) equiped with a Moravian C3 CMOS camera, 1200s exposure [1],1500s exposure [2], [3] RC 500mm f=1.414m at Salvia Observatory (I73) equipped with ZWO6200MMPRO CMOS camera, 2400s exposure, [1][2][3] are equiped with RAPAS filters meeting the Gaia G, Gbp, Grp photometric bands. The FITS files are reduced with the Gaia photometric catalog in respective G, Gbp, Grp bands.
The afterglow is detected RA(J2000) = 18h 14m 53.57s ; Dec(J2000) = +33° 26’ 20.4” ; ± 0.5’’ [1][2]
At this location it is not detected, above the upper limit magnitude [3]
MJD (mid) Gaia band mag.(Gaia) RAPAS station
60643.72986 G 20.50 ± 0.5 [1]
60644.77083 G 21.00 ± 0.5 [2]
60647.74270 G+Gbp+Grp >21. [3]
RAPAS ( https://proam-gemini.fr/rapas/ ) is a new ProAm collaboration funded by Paris Observatory, delivering to a network of french amateur observatories a set of 3 filters meeting the Gaia spectral bands. This network is dedicated to deliver data in the Gaia photometric system on selected astrophysical alerts by Astro-COLIBRI ( https://astro-colibri.com/ ) or from Gaia alerts.
GCN Circular 38432
Subject
Fermi-GBM Sub-Threshold Detection of GRB 241128A
Date
2024-12-03T17:09:15Z (a year ago)
From
rhamburg@usra.edu
Via
Web form
R. Hamburg (USRA) reports on behalf of the Fermi-GBM Team:
The Swift-BAT detected GRB 241128A on 2024-11-28 at 16:14:34 UTC (Brivio et al. 2024, GCN 38367). There was no Fermi-GBM onboard trigger around this event time.
An automated, blind search for gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified no counterparts.
The GBM Targeted Search [1], a sensitive and coherent search for subthreshold GRB-like signals, was run from +/-30 s around the Swift-BAT trigger time and identified a gamma-ray transient most significantly at 16:14:38 UTC (Fermi MET=754503283), about 4 s after the Swift-BAT trigger time. The transient is approximately 2 s in duration and was identified with the "normal" spectral template (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3) with FAR of 1.7e-4 Hz. The Targeted Search localization is consistent with the Swift-BAT location.
[1] Goldstein et al. arXiv:1903.12597
GCN Circular 38422
Subject
GRB 241128A: Swift/UVOT Upper Limits
Date
2024-12-02T19:11:35Z (a year ago)
From
Sam Shilling at Lancaster University <shilling.sam@gmail.com>
Via
Web form
S.P.R. Shilling (Lancaster U.) and Brivio (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 241128A
3880 s after the BAT trigger (Brivio et al., GCN Circ. 38367).
No optical afterglow consistent with the enhanced XRT position
(Beardmore et al., GCN Circ. 38374) 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 first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 3880 4029 147 >20.0
white 3880 4649 344 >20.6
v 4860 5059 197 >19.0
b 4244 4444 197 >19.7
u 4038 4238 197 >19.2
m2 5065 10054 534 >19.4
w2 4655 4855 197 >19.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.067 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 38395
Subject
GRB 241128A: AbAO optical upper limit
Date
2024-11-30T15:48:32Z (a year ago)
Edited On
2024-12-03T14:38:31Z (a year ago)
From
Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>
Via
legacy email
N. Pankov (HSE), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI),
S. Belkin (HSE, Monash) report on behalf of GRB IKI FuN:
We observed the field of GRB 241128A (Brivio et al., GCN 38367; Page, GCN
38368; Parsotan et al., GCN 38387) with AS-32 telescope of Abastumani
observatory (AbAO) in R-filter on 2024-11-29 starting (UT) 14:47:06. We do
not detect the afterglow (Hu et al., GCN 38371; Izzo and Malesani, GCN
38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382; Pankov et al.,
GCN 38383). Preliminary photometry of the field is the following
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)
2024-11-29 14:47:06 0.96877 85x60 R n/d n/d 20.2
The photometry is based on nearby USNO-B1.0 R2 stars
GCN Circular 38387
Subject
GRB 241128A: Swift-BAT refined analysis
Date
2024-11-30T02:20:35Z (a year ago)
From
Amy <yarleen@gmail.com>
Via
email
T. Parsotan (GSFC), S. D. Barthelmy (GSFC), R. Brivio (INAF-OAB), R. Gupta
(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), D. Sadaula
(GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+899 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 241128A (trigger #1270999)
(Brivio et al., GCN Circ. 38367). The BAT ground-calculated position is
RA, Dec = 273.724, 33.492 deg which is
RA(J2000) = 18h 14m 53.7s
Dec(J2000) = +33d 29' 32.9"
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The
partial coding was 52%.
The mask-weighted light curve shows a multi-pulse structure that starts at
~T0 and ends at ~T+240 s. The main pulse starts at ~T0, peaks at ~T+3 s,
and ends at ~T+10 s. In addition, there is a weak pulse at ~T+220 s. T90
(15-350 keV) is 238.32 +- 15.83 sec (estimated error including systematics).
The time-averaged spectrum from T-0.86 to T+244.08 sec is best fit by a
simple power-law model. The power law index of the time-averaged spectrum
is 1.54 +- 0.31. The fluence in the 15-150 keV band is 1.1 +- 0.2 x 10^-06
erg/cm2. The 1-sec peak photon flux measured from T+2.88 sec in the 15-150
keV band is 1.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90%
confidence level.
The results of the batgrbproduct analysis are available at
https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1270999
GCN Circular 38383
Subject
GRB 241128A: Mondy optical observations
Date
2024-11-29T16:03:19Z (a year ago)
From
XXXX at IKI <alex@cgrsmx.iki.rssi.ru>
Via
legacy email
N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI) report on behalf of GRB IKI FuN:
We observed the field of GRB 241128A (Brivio et al., GCN 38367; Page, GCN 38368) with AZT-33IK telescope of Mondy observatory in R-filter on 2024-11-29 starting (UT) 10:48:37. We detect the afterglow (Hu et al., GCN 38371; Izzo and Malesani, GCN 38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382).
Preliminary photometry of the afterglow is the following
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)
2024-11-29 10:48:37 0.79796 15x120 R 19.80 0.10 22.9
The photometry is based on nearby USNO-B1.0 R2 stars.
GCN Circular 38382
Subject
GRB 241128A: GRANDMA and Kilonova-Catcher Optical Afterglow Detections and Upperlimits
Date
2024-11-29T15:25:01Z (a year ago)
Edited On
2024-11-29T20:56:01Z (a year ago)
From
Dalya Akl at American Uni. SHJ <dalyaakl.d@gmail.com>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Dalya Akl at American Uni. SHJ <dalyaakl.d@gmail.com>
Via
Web form
D. Akl (AUS), E. de Bruin (UMN), C. Andrade (UMN), M. Tanasan (NARIT), N. Kochiashvili (AbAO), T. Hussenot-Desenonges (IJCLAB), M. Coughlin (UMN), M. Molham (NRIAG), S. Agayeva (Shamakhy Obs.),
S. Antier (OCA), S. Karpov (FZU), D. Turpin (CEA-Saclay/Irfu), I. Tosta e Melo (UniCT-DFA), P. Hello (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC), N. Guessoum (AUS), M. Masek (FZU), A. Klotz (IRAP), M. Boer, S. Gervasoni, C. Limonta (OCA), E. Broens, F. Kugel (KNC), on behalf of the GRANDMA and Kilonova-Catcher collaborations:
We observed the field of GRB 241128A (Brivio et al., GCN 38367) detected by Swift-BAT with GRANDMA and its citizen science project Kilonova-catcher (KNC). Our observations were performed with the FRAM-CTA-N, TAROT-TCA, KNC T400, and KNC-T-BRO telescopes starting from TGRB+108 min.
We clearly detect the optical afterglow within the Swift-XRT uncertainty region (Beardmore et al., GCN 38374) and obtain the following magnitudes and 5-sigma upperlimits:
+---------------------+-------------+--------+----------------+------------+
| T-mid(UTC) | Exposure(s) | Filter | Mag (AB) | Instrument |
+=====================+=============+========+================+============+
| 2024-11-28T18:02:48 | 27x60 | Clear | 19.50 +/- 0.07 | KNC |
| 2024-11-28T18:11:15 | 7x180 | Clear | 19.78 +/- 0.22 | KNC |
| 2024-11-28T18:38:26 | 11x180 | Clear | 19.67 +/- 0.19 | KNC |
| 2024-11-28T19:31:58 | 18x120 | R | 17.84 (U.L.) | FRAM-CTA-N |
| 2024-11-28T19:40:56 | 3x180 | Clear | 17.53 (U.L.) | TAROT-TCA |
+---------------------+-------------+--------+----------------+------------+
Our detection is consistent with the optical afterglow detected and reported by Hu et al., GCN 38371.
Further, our magnitudes are consistent with those reported by LCO (Izzo and Malesani, GCN 38372) and NOT (Gompertz et al., GCN 38373).
All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). Images obtained in Johnson Cousin filters were calibrated using the Gaia DR3 Synphot catalog, while images taken with a clear filter were calibrated using the Gaia eDR3 Catalog.
We use the SkyPortal application (skyportal.io) to monitor our observational campaign (Coughlin et al. 2023).
GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).
GCN Circular 38380
Subject
Swift GRB 241128A: Global MASTER-Net observations report
Date
2024-11-29T10:38:36Z (a year ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
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) was pointed to the Swift GRB 241128A ( R. Brivio et al., GCN 38367) errorbox 65606 sec after notice time and 65649 sec after trigger time at 2024-11-29 10:28:43 UT, with upper limit up to 19.3 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -12.6 deg.
The galactic latitude b = 21 deg., longitude l = 61 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2687409
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
65694 | MASTER-Tunka | C | 90 | 19.1 |
65798 | MASTER-Tunka | C | 90 | 19.2 |
65887 | MASTER-Tunka | C | 60 | 19.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 38376
Subject
GRB 241128A: Swift-XRT refined Analysis
Date
2024-11-29T01:47:12Z (a year ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
J.A. Kennea (PSU), D.N. Burrows (PSU), M. A. Williams (PSU), A.P.
Beardmore (U. Leicester), J.P. Osborne (U. Leicester), T. Sbarrato
(INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB) and P.A.
Evans report on behalf of the Swift-XRT team:
We have analysed 6.2 ks of XRT data for GRB 241128A, from 3.9 ks to
28.3 ks after the BAT trigger. The data are entirely in Photon
Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.51 (+/-0.15).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.07 (+0.31, -0.25). The
best-fitting absorption column is 8.9 (+7.5, -2.9) x 10^20 cm^-2,
consistent with the Galactic value of 6.0 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 3.2 x 10^-11 (4.0 x
10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 8.9 (+7.5, -2.9) x 10^20 cm^-2
Galactic foreground: 6.0 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index: 2.07 (+0.31, -0.25)
If the light curve continues to decay with a power-law decay index of
0.51, the count rate at T+24 hours will be 0.017 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.6 x
10^-13 (6.9 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01270999.
This circular is an official product of the Swift-XRT team.
GCN Circular 38374
Subject
GRB 241128A: Enhanced Swift-XRT position
Date
2024-11-28T23:56:21Z (a year ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1910 s of XRT Photon Counting mode data and 3 UVOT
images for GRB 241128A, 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 = 273.72356, +33.43915 which is equivalent
to:
RA (J2000): 18h 14m 53.65s
Dec (J2000): +33d 26' 20.9"
with an uncertainty of 3.0 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 38373
Subject
GRB 241128A: NOT optical observations
Date
2024-11-28T22:59:25Z (a year ago)
From
Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>
Via
Web form
B. Gompertz (Birmingham), D. B. Malesani (DAWN/NBI and Radboud Univ.), L. Izzo (INAF/OACN, DARK/NBI), J. H. Terwel (NOT and TCD) report on behalf of a larger collaboration:
We observed the field of GRB 241128A (Brivio et al., GCN 38367; Page, GCN 38368) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out at large airmass and under a poor seeing of 2.5". A total of 3x300 s and 5x200 s were secured in the SDSS r and z bands, respectively.
From a preliminary reduction of the data, the optical afterglow (Hu et al., GCN 38371; Izzo & Malesani, GCN 38372) is well detected in our images. We measure
r = 19.52 +- 0.03 AB on Nov 28.80 UT (2.95 hr after the GRB);
z = 19.03 +- 0.05 AB on Nov 28.81 UT (3.25 hr after the GRB).
Both magnitudes are calibrated against nearby objects from the Pan-STARRS catalog.
We note a discrepancy in the r-band magnitude compared to the nearly simultaneous measurement by Izzo & Malesani (GCN 38372), which we are unable to account for at the present time.
GCN Circular 38372
Subject
GRB 241128A: LCO optical detection
Date
2024-11-28T21:48:43Z (a year ago)
From
luca.izzo@inaf.it
Via
Web form
L. Izzo (INAF-OACn and DARK/NBI), and D. B. Malesani (DAWN/NBI and Radboud Univ.) report:
We observed the field of GRB 241128A (Brivio et al., GCN #38367) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at the Teide Observatory, Spain. Observations started on 2024 November 28 at 19:04 UT (2.83 hr after the GRB trigger). We obtained a series of 3x300 s images in the SDSS-r filter.
The afterglow reported by Hu et al. (GCN #38371; see also Page et al., GCN #38368) is well detected in our images. We measure a preliminary magnitude of r = 19.24 +/- 0.07 mag (AB), calibrated against nearby stars from the Pan-STARRS catalog.
This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101004719.
GCN Circular 38371
Subject
GRB 241128A: 1.5m OSN optical afterglow detection
Date
2024-11-28T21:15:38Z (a year ago)
From
Youdong HU at INAF-OAB <huyoudong072@hotmail.com>
Via
Web form
Y.-D. Hu (INAF-OAB), V. Casanova, E. Fernandez-Garcia, A. J. Castro-Tirado, S.-Y. Wu, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC) and G. Garcia-Segura (UNAM), on behalf of a larger collaboration, report:
Following the detection of GRB 241128A by Swift (Brivio et al. GCN 38367), we triggered the 1.5m OSN telescope in Granada (Spain) starting on Nov 28, 18:19 UT (~2.1 hrs post burst) in R & I-bands. An uncatalogued object is detected within the XRT error circle (Page et al. GCNC 38368) with R=19.3+-0.1 mag, at coordinates RA(J2000) = 18:14:53.55, DEC(J2000) = +33:26:20.32, which we proposed as the GRB 241128A optical afterglow.
Spectroscopic observations are encouraged.
We thank the staff at OSN for their excellent support.
GCN Circular 38368
Subject
GRB 241128A: Swift-XRT afterglow detection
Date
2024-11-28T18:34:25Z (a year ago)
From
K.L. Page at U Leicester <klp5@leicester.ac.uk>
Via
email
K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
Immediately following the BAT trigger on GRB 241128A, Swift entered the
South Atlantic Anomaly, during which time no XRT data were taken. The
field of the GRB became visible to the XRT at 17:16 UT, 3.9 ks after the
trigger, at which point the XRT afterglow of the burst was detected at a
position of RA, Dec = 273.72454, 33.43853 which is equivalent to:
RA (J2000): 18:14:53.89
Dec(J2000): +33:26:18.9
with an uncertainty of 3.5 arcsec (radius, 90% confidence).
This circular is an official product of the Swift-XRT team.
GCN Circular 38367
Subject
GRB 241128A: Swift detection of a burst
Date
2024-11-28T16:37:44Z (a year ago)
From
K.L. Page at U Leicester <klp5@leicester.ac.uk>
Via
email
R. Brivio (INAF-OAB), M. Ferro (INAF-OAB), C. Gronwall (PSU),
R. Gupta (NASA GSFC), A. Y. Lien (U Tampa), K. L. Page (U Leicester),
D. M. Palmer (LANL), C. Salvaggio (INAF-OAB) and
T. Sbarrato (INAF-OAB) report on behalf of the Neil Gehrels Swift
Observatory Team:
At 16:14:34 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 241128A (trigger=1270999). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 273.724, +33.435 which is
RA(J2000) = 18h 14m 54s
Dec(J2000) = +33d 26' 07"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). Although a telemetry gap prevented
the download of a BAT lightcurve, the trigger duration of 4 s
indicates that this is a long burst.
The XRT began observing the field at 16:16:32.2 UT, 118.0 seconds after
the BAT trigger. No source was detected in the 2.5-s promptly available
image. We are waiting for the full dataset to detect and localise the
XRT counterpart.
There are no prompt UVOT data available at this time.
Although this source has not been confirmed during the short XRT observation
(truncated by entrance into the SAA) or by the non-availability of the
BAT lightcurve, the strength of peak (8.4 sigma) in the BAT image
indicates that this is an astrophysical source.
Burst Advocate for this burst is R. Brivio (riccardo.brivio AT inaf.it).
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/)