December 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 36698] GRB 241229A: SVOM detection of a long burst
by GCN Circulars 29 Dec '24

29 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38697 SUBJECT: GRB 241229A: SVOM detection of a long burst DATE: 24/12/29 01:42:15 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Yifang Liang (PMOC), An Li (BNU), Wenjin Xie, Donghua Zhao (NAOC), Hui Yang (IRAP), Hatsune Goto (CEA), Li Zhang (IHEP), Lipin Xin (NAOC) report: At 2024-12-29T00:04:21 (Tb) SVOM/ECLAIRs triggered on GRB 241229A (SVOM burst-id sb24122901). The following trigger information was received on the ground with low-latency by the SVOM VHF Alert Network. A total of 8 Alerts were received from Count-Rate Trigger (CRT) and Image Trigger (IMT). The best Alert was produced by CRT with a signal-to-noise ratio of 11.0 in the 8-120 keV energy band over a time window of 20.48 s starting at Tb. The localization of the best Alert is RA, DEC = 192.893, +31.857 (J2000) with a 90% C.L. radius of 7.6 arcmin (including a systematic error of 2 arcmin added in quadrature). SVOM slewed automatically to the burst. GRM, MXT and VT data will be reported later. Burst Advocate for this burst is Yifang Liang (yfliang(a)pmo.ac.cn). Please contact the BA by email if you require additional information regarding the SVOM follow-up of this burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/38697. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36697] Fermi GRB 241228B: Global MASTER-Net observations report
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38696 SUBJECT: Fermi GRB 241228B: Global MASTER-Net observations report DATE: 24/12/28 21:30:39 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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-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) started inspect of the Fermi GRB 241228B ( Fermi GBM team, GCN 38682) errorbox 55483 sec after notice time and 55523 sec after trigger time at 2024-12-28 19:38:28 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 78 deg. The sun altitude is -19.7 deg. The galactic latitude b = 24 deg., longitude l = 209 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2724467 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 55553 | 2024-12-28 19:38:28 | MASTER-SAAO | (07h 54m 54.88s , +12d 40m 09.5s) | C | 60 | 18.1 | 56070 | 2024-12-28 19:47:05 | MASTER-SAAO | (08h 03m 04.96s , +12d 39m 30.2s) | C | 60 | 16.7 | 56692 | 2024-12-28 19:57:27 | MASTER-SAAO | (07h 54m 52.81s , +12d 39m 26.0s) | C | 60 | 18.0 | 56772 | 2024-12-28 19:58:46 | MASTER-SAAO | (08h 03m 04.32s , +12d 40m 43.1s) | C | 60 | 16.5 | 58004 | 2024-12-28 20:19:19 | MASTER-SAAO | (07h 54m 54.92s , +12d 40m 11.9s) | C | 60 | 18.3 | 58084 | 2024-12-28 20:20:39 | MASTER-SAAO | (08h 03m 07.28s , +12d 39m 10.9s) | C | 60 | 17.8 | 58882 | 2024-12-28 20:33:57 | MASTER-SAAO | (07h 54m 51.05s , +12d 39m 25.5s) | C | 60 | 18.5 | 58961 | 2024-12-28 20:35:16 | MASTER-SAAO | (08h 03m 04.08s , +12d 40m 44.1s) | C | 60 | 18.3 | 59580 | 2024-12-28 20:45:35 | MASTER-SAAO | (07h 54m 50.78s , +12d 40m 28.4s) | C | 60 | 18.5 | 59660 | 2024-12-28 20:46:55 | MASTER-SAAO | (08h 03m 10.24s , +12d 39m 46.4s) | C | 60 | 18.8 | 60280 | 2024-12-28 20:57:15 | MASTER-SAAO | (07h 54m 57.16s , +12d 39m 31.6s) | C | 60 | 18.8 | 60359 | 2024-12-28 20:58:34 | MASTER-SAAO | (08h 03m 02.92s , +12d 38m 48.5s) | C | 60 | 18.8 | 60438 | 2024-12-28 20:59:53 | MASTER-SAAO | (07h 58m 43.86s , +14d 32m 58.5s) | C | 60 | 18.9 | 60523 | 2024-12-28 21:01:18 | MASTER-SAAO | (08h 07m 02.39s , +14d 34m 55.5s) | C | 60 | 18.8 | 60604 | 2024-12-28 21:02:39 | MASTER-SAAO | (08h 03m 12.94s , +16d 27m 55.2s) | C | 60 | 18.8 | 60683 | 2024-12-28 21:03:58 | MASTER-SAAO | (08h 11m 26.65s , +16d 27m 10.6s) | C | 60 | 18.7 | 60762 | 2024-12-28 21:05:17 | MASTER-SAAO | (08h 10m 29.63s , +12d 39m 19.4s) | C | 60 | 18.9 | 60841 | 2024-12-28 21:06:36 | MASTER-SAAO | (08h 18m 45.35s , +12d 40m 59.7s) | C | 60 | 18.8 | 60921 | 2024-12-28 21:07:56 | MASTER-SAAO | (08h 14m 28.98s , +14d 34m 17.4s) | C | 60 | 18.7 | 61000 | 2024-12-28 21:09:15 | MASTER-SAAO | (08h 22m 39.46s , +14d 33m 30.7s) | C | 60 | 18.8 | 61079 | 2024-12-28 21:10:34 | MASTER-SAAO | (07h 58m 46.86s , +14d 33m 13.5s) | C | 60 | 18.9 | 61159 | 2024-12-28 21:11:53 | MASTER-SAAO | (08h 06m 59.82s , +14d 34m 45.5s) | C | 60 | 18.9 | 61238 | 2024-12-28 21:13:13 | MASTER-SAAO | (08h 03m 09.07s , +16d 27m 01.5s) | C | 60 | 18.9 | 61317 | 2024-12-28 21:14:32 | MASTER-SAAO | (08h 11m 31.76s , +16d 29m 13.2s) | C | 60 | 18.9 | 61397 | 2024-12-28 21:15:52 | MASTER-SAAO | (08h 10m 27.01s , +12d 40m 12.9s) | C | 60 | 19.0 | 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/38696. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36696] GRB 241228A: Fermi GBM Observation
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38695 SUBJECT: GRB 241228A: Fermi GBM Observation DATE: 24/12/28 21:20:27 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 03:57:10.17 UT on 28 December 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241228A (trigger 757051035/241228165), which was also detected by Swift BAT (V. D'Elia et al. 2024, GCN 38681). The Fermi GBM on-ground location is consistent with the Swift BAT position. The angle from the Fermi LAT boresight is 55 degrees. The GBM light curve consists of a minor triggering episode followed by a two-peak episode, with a duration (T90) of about 8.3 s (50-300 keV). The time-averaged spectrum from T0-0.5 to T0+10.9 s is best fit by a Band function with Epeak = 66 +/- 3 keV, alpha = -0.68 +/- 0.08, and beta = -2.8 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (5.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.0 s in the 10-1000 keV band is 19.9 +/- 0.4 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/38695. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36695] GRB241228B: GROWTH-India Telescope optical observations
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38694 SUBJECT: GRB241228B: GROWTH-India Telescope optical observations DATE: 24/12/28 19:49:02 GMT FROM: V. Swain at IIT Bombay <vishwajeet.s(a)iitb.ac.in> T. Mohan, V. Swain, A. P. Saikia, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team: We observed the field of GRB241228B (Fermi GRB, GCN 38682) with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2024-12-28 17:37:04 UT, i.e., 13.39 hours after the Fermi trigger. We obtained multiple exposures in r' filter. We detected the optical afterglow in our stacked image at position reported by Kumar et al., GCN 38684. The photometry result follows as: | MJD (mid) | Filter | Total Exposure Time (sec) | Magnitude (AB) | | ------------- | ------ | ------------------ | -------------- | | 60672.73893 | r' | 840 | 20.05 +/- 0.1 | Our magnitude is consistent with other optical observations (Kumar et al., GCN 38684, An et al., GCN 38687, Kumar et al., GCN 38691, Ortega-Casas et al., GCN 38692). The measurement is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/. View this GCN Circular online at https://gcn.nasa.gov/circulars/38694. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36694] Swift GRB 241228A: Global MASTER-Net observations report
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38693 SUBJECT: Swift GRB 241228A: Global MASTER-Net observations report DATE: 24/12/28 19:16:36 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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-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 Swift GRB 241228A ( V. D'Elia et al., GCN 38681) errorbox 53242 sec after notice time and 53275 sec after trigger time at 2024-12-28 18:45:10 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 72 deg. The sun altitude is -11.2 deg. The galactic latitude b = -37 deg., longitude l = 90 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2724378 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 53366 | MASTER-SAAO | C | 180 | 12.2 | 53565 | MASTER-SAAO | C | 180 | 16.4 | 53764 | MASTER-SAAO | C | 180 | 16.5 | 53964 | MASTER-SAAO | C | 180 | 16.6 | 54163 | MASTER-SAAO | C | 180 | 16.7 | 54364 | MASTER-SAAO | C | 180 | 16.5 | 54563 | MASTER-SAAO | C | 180 | 16.6 | 54763 | MASTER-SAAO | 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/38693. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36693] GRB 241228B: LCOGT photometry of the likely optical counterpart GOTO24jmz
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38692 SUBJECT: GRB 241228B: LCOGT photometry of the likely optical counterpart GOTO24jmz DATE: 24/12/28 18:26:47 GMT FROM: Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf(a)iac.es> I. Ortega-Casas, B. Armas-Chinea, F. Dobrindt, P. Escudero-Coca, G. Fernández-Rodríguez, Á. García Lozano, A. Huertas Ferrer, C. Méndez-Lapido, M. Torreiro Martínez, G. Villa (ULL), S.R. Berlanas, F. Poidevin, and I. Pérez-Fournon (IAC and ULL) We report on multi-band optical imaging of the GOTO optical counterpart candidate GOTO24jmz (Kumar et al., GCN 38684 and GCN 38691) of GRB 241228B detected by Fermi (Fermi GBM team, GCN 38682) with Las Cumbres Observatory global telescope network (LCOGT) telescopes. We used first the two 40-cm telescopes of the LCOGT node at Haleakala Observatory (Maui, Hawaii). The observations (600 sec in the SDSS r', i', and g' filters and in the PanSTARRS zs filter) started at 09:33:19 UT on 2024-12-28, i.e. 5.33 hr after the Fermi GBM trigger. We used also one of the LCOGT 1-m telescopes located at the LCOGT node at Siding Spring Observatory (Australia) to obtain a 180-sec SDSS r' image starting at 14:09:01 on 2024-12-28, i.e. 9.93 hr after the Fermi GBM trigger. The likely optical counterpart of GRB 241228B is clearly detected in all the LCOGT observations at the position reported by Kumar et al. (GCN 38684 and GCN 38691). This source has also been detected by An et al. (GCN 38687). We measure the following magnitudes, calibrated against PanSTARRS and not corrected for Galactic extinction: r' = 18.62 +/- 0.06, on 2024-12-28 09:38:19 UT i' = 18.31 +/- 0.09, on 2024-12-28 10:07:03 UT g' = 19.40 +/- 0.06, on 2024-12-28 10:18:46 UT zs = 18.25 +/- 0.28, on 2024-12-28 10:49:38 UT r' = 19.62 +/- 0.05, on 2024-12-28 14:10:31 UT These results are based on observations made with the Las Cumbres Observatory’s education network telescopes that were upgraded through generous support from the Gordon and Betty Moore Foundation and are part of a course on Astrophysical Techniques of the Master in Astrophysics of the Universidad de La Laguna, Tenerife, Spain (LCOGT observing programme IAC2024B-010, ULL-ASTRO-MASTER). This work makes use of observations from the Las Cumbres Observatory global telescope network (1-m telescopes, LCOGT observing programme IAC2024B-004, SGLF). View this GCN Circular online at https://gcn.nasa.gov/circulars/38692. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36692] GRB 241228B: GOTO24jmz optical follow-up observations
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38691 SUBJECT: GRB 241228B: GOTO24jmz optical follow-up observations DATE: 24/12/28 17:51:08 GMT FROM: Amit Kumar at Royal Holloway - UoL/ U of Warwick, UK <amitkundu515(a)gmail.com> A. Kumar, G. Ramsay, B. P. Gompertz, S. Belkin, D. O'Neill, R. Starling, K. Ackley, M. J. Dyer, J. Lyman, K. Ulaczyk, F. Jimenez-Ibarra, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, E. Palle and D. Pollacco report on behalf of the GOTO collaboration: We report on updated observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022, Dyer et al. 2024) on GRB 241228B (Fermi GBM Team, GCN 38682). Follow-up observations of the GOTO optical counterpart candidate GOTO24jmz (Kumar et al. GCN 38684) were performed by GOTO-South at 2024-12-28 13:00:42 UT (t0+8.79h post-trigger). The observation consisted of 4x90s exposure in the GOTO L-band (400-700 nm). Images were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using deeper template observations of the same pointings. GOTO24jmz (RA = 08:31:05.46 and Dec = +06:50:54.07) was detected at an L-band magnitude of 19.73 ± 0.10 at t0+8.79h post-trigger. These updated observations align well with the previously reported decay rate of t^−1.45 (Kumar et al., GCN 38684) and are also consistent with the magnitude reported by An et al. (GCN 38687). We encourage further deeper follow-up observations. Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction. GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC). View this GCN Circular online at https://gcn.nasa.gov/circulars/38691. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36691] GRB 241226A: Swift/BAT-GUANO localization skymap of a burst
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38690 SUBJECT: GRB 241226A: Swift/BAT-GUANO localization skymap of a burst DATE: 24/12/28 16:27:08 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 241226A onboard (T0: 2024-12-26T22:33:39.66 UTC, Fermi trig 756945224) The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 10.0 in a 16.384 s analysis time bin, starting at T0 + 0.0 s. Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2025. in prep) The 90% credible area is 14,391 deg2 and the 50% credible area is 4,190 deg2. The integrated probability inside the coded field of view is 2%. The NITRATES skymap is consistent with the Fermi localization reported in the final position notice (GCN 38674). A plot of the probability skymap can be viewed here: [skymap_plot](https://guano.swift.psu.edu/trigger_report?id=756945254/#:~:te… The probability skymap file can be downloaded from the link here [skymap_fits_file](https://guano.swift.psu.edu/files/756945254/0_n_PROBMAP) Instructions on how to read and manipulate this map can be found here: https://guano.swift.psu.edu/documentation More details about this burst can be found on the trigger report page here: https://guano.swift.psu.edu/trigger_report?id=756945254 GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ View this GCN Circular online at https://gcn.nasa.gov/circulars/38690. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36690] GRB 241228A: GROWTH-India telescope optical upper limit
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38689 SUBJECT: GRB 241228A: GROWTH-India telescope optical upper limit DATE: 24/12/28 16:25:15 GMT FROM: V. Swain at IIT Bombay <vishwajeet.s(a)iitb.ac.in> T. Mohan, V. Swain, A.P. Saikia, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team: We observed the field of the GRB 241228A (D'Elia et al., GCN 38681) with the 0.7m GROWTH-India Telescope (GIT). Observation started at 2024-12-28T13:13:58 UT, about 9.27 hours after the trigger. We responded to the enhanced Swift-XRT coordinates (Evans et al., GCN 38683) and obtained multiple images of 360s in r' filter. The obtained upper limit in our stacked image is: | MJD (mid) | Filter | Exposure (s) | Limiting Magnitude (AB) | | ----------- | ------ | ------------ | ----------------------- | | 60672.56537 | r' | 4x360 | 20.8 The upper limit is consistent with Kuin et al., GCN 38685. The magnitude is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. The GROWTH India Telescope (GIT, Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/. View this GCN Circular online at https://gcn.nasa.gov/circulars/38689. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36689] GRB 241228B: Swift ToO observations
by GCN Circulars 28 Dec '24

28 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38688 SUBJECT: GRB 241228B: Swift ToO observations DATE: 24/12/28 15:17:34 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/GBM GRB 241228B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021750 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/GBM event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38688. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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