January 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 36907] GRB 250109A / EP250109A: Swift/BAT-GUANO localization skymap of a burst
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38900 SUBJECT: GRB 250109A / EP250109A: Swift/BAT-GUANO localization skymap of a burst DATE: 25/01/10 21:06:43 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 250109A onboard (T0: 2025-01-09T06:17:08.60 UTC, Fermi trig 758096233) The Fermi notice, … [View More]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 12.1 in a 16.384 s analysis time bin, starting at T0 - 8.192 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 0.06 deg2 and the 50% credible area is ~0.01 deg2. The integrated probability inside the coded field of view is 98%. 55% of the NITRATES localization probability is contained within a 0.1 deg radius circle around the maximum probability position. The majority of the remaining probability is contained within similarly sized peaks of probability across the BAT coded field of view. The maximum probability position of the NITRATES skymap is, RA, Dec = 88.806, -12.458 deg which is RA(J2000) = 05h 55m 13.4s Dec(J2000) = -12d 27′ 28.8″ The NITRATES skymap is consistent with the Fermi localization reported in the final position notice (GCN 38873). It is also consistent with the position of the X-ray transient EP250109a (GCN 38864, GCN 38889), with the position lying on the 0.28 credible region contour. The spatial and temporal coincidence of GRB 250109A and EP250109a make it very likely that they originate from the same cosmic event. A plot of the probability skymap can be viewed here: [skymap_plot](https://guano.swift.psu.edu/trigger_report?id=758096263/#:~:te… The probability skymap file can be downloaded from the link here [skymap_fits_file](https://guano.swift.psu.edu/files/758096263/0_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=758096263 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/38900. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 36906] GRB 250109A / EP250109a: Swift detection of the X-ray afterglow
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38899 SUBJECT: GRB 250109A / EP250109a: Swift detection of the X-ray afterglow DATE: 25/01/10 20:57:21 GMT FROM: Jamie Kennea at Penn State <jak51(a)psu.edu> J. A. Kennea (PSU), P. A. Evans and K. L. Page (Leicester) report on behalf of the Swift/XRT team: Swift/XRT performed a further 3.1ks of exposure on GRB 250109A (GCN #38887) AKA EP250109a (GCN #38864), following on from a rapid 1ks observation which did not detect the counterpart (GCN #38867). … [View More]

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[vsnet-grb-info 36905] GRB 250108A: Swift/XRT afterglow fading
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38898 SUBJECT: GRB 250108A: Swift/XRT afterglow fading DATE: 25/01/10 17:28:08 GMT FROM: Tullia Sbarrato at INAF-OAB <tullia.sbarrato(a)inaf.it> Tullia Sbarrato (INAF-OAB) & Noel Klinger (GSFC/UMBC/CRESSTII) report on behalf of the Swift-XRT team: Swift-XRT has performed further follow-up observations of the SVOM/ECLAIRs GRB 250108A (Zheng et al., GCN 38845), collecting 6.6 ks of Photon Counting (PC) mode data between T0+16.1 ks and T0+192.1 ks.… [View More]

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[vsnet-grb-info 36904] GRB 250107D: CALET Gamma-Ray Burst Monitor detection
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38897 SUBJECT: GRB 250107D: CALET Gamma-Ray Burst Monitor detection DATE: 25/01/10 17:22:49 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University <kawakubo(a)phys.aoyama.ac.jp> T. Sakamoto, A. Yoshida, S. Sugita, Y. Kawakubo (AGU), 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), S. Ricciarini (U of Florence), P. S. … [View More]

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[vsnet-grb-info 36903] GRB 250107C: CALET Gamma-Ray Burst Monitor detection
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38896 SUBJECT: GRB 250107C: CALET Gamma-Ray Burst Monitor detection DATE: 25/01/10 16:51:07 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University <kawakubo(a)phys.aoyama.ac.jp> A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU), 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), S. Ricciarini (U of Florence), P. S. … [View More]

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[vsnet-grb-info 36902] Konus-Wind detection of GRB 250107C
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38895 SUBJECT: Konus-Wind detection of GRB 250107C DATE: 25/01/10 15:59:26 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 250107C (SVOM/GRM observation: Xue et al., GCN 38870; IPN triangulation: Svinkin et al., GCN 38879) triggered Konus-Wind (KW) at T0=67934.719 s UT (18:52:14.719). … [View More]

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[vsnet-grb-info 36901] LIGO/Virgo/KAGRA S250109bi: Updated Sky localization
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38894 SUBJECT: LIGO/Virgo/KAGRA S250109bi: Updated Sky localization DATE: 25/01/10 14:58:34 GMT FROM: alexandresebastien.goettel(a)LIGO.org The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1) and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250109bi (GCN Circular 38863). Parameter estimation has … [View More]

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[vsnet-grb-info 36900] LIGO/Virgo/KAGRA S250109f: Updated Sky localization
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38893 SUBJECT: LIGO/Virgo/KAGRA S250109f: Updated Sky localization DATE: 25/01/10 14:55:16 GMT FROM: alexandresebastien.goettel(a)LIGO.org The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250109f (GCN Circular … [View More]

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[vsnet-grb-info 36899] LIGO/Virgo/KAGRA S250108eo: Updated Sky localization
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38892 SUBJECT: LIGO/Virgo/KAGRA S250108eo: Updated Sky localization DATE: 25/01/10 14:50:11 GMT FROM: alexandresebastien.goettel(a)LIGO.org The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250108eo (GCN Circular … [View More]

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[vsnet-grb-info 36898] EP-WXT trigger EP250108a：Xinglong optical follow-up observations
by GCN Circulars 10 Jan '25

10 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38891 SUBJECT: EP-WXT trigger EP250108a：Xinglong optical follow-up observations DATE: 25/01/10 14:14:46 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Report on behalf of the Xinglong collaboration: Junjie-Jin(NAOC), Haiyang-Mu(NAOC), Jinlei-Zhang(NAOC), Shengsheng-Zhang(NAOC), Pengliang-Du(NAOC), JianFeng-Tian(NAOC), Zhou-Fan(NAOC), Hong-Wu(NAOC), Jie-Zheng (NAOC) We observed the field of the X-ray transient, EP 250108a by the the Tsinghua-NAOC 0.… [View More]

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