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

[vsnet-grb-info 36382] GRB 241128C: SVOM/GRM observation
by GCN Circulars 30 Nov '24

30 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38389 SUBJECT: GRB 241128C: SVOM/GRM observation DATE: 24/11/30 02:39:57 GMT FROM: Wang-Chen Xue <wcxuemail(a)gmail.com> SVOM/GRM team: Wang-Chen Xue, Chao Zheng, Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Jiang-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Wen-Long Zhang, Wen-Jun Tan, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Qiu Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao (IHEP), Maria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Tais Maiolino (LUPM), Frédéric Piron (LUPM), Stéphane Schanne (CEA), Jingwei Wang (IAP), JeanLuc Attéia (IRAP) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong (IHEP), Bing Zhang (UNLV) report on behalf of the SVOM team: During the commissioning phase, SVOM/GRM was triggered in-flight by a short burst (SVOM trigger reference: sb24112802) at 2024-11-28T18:07:23.050 UTC (T0). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of single pulse with a duration of about 0.3 s. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb241128C.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Wang-Chen Xue (IHEP)(xuewc(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/38389. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36381] GRB 241128B: SVOM/GRM observation
by GCN Circulars 30 Nov '24

30 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38388 SUBJECT: GRB 241128B: SVOM/GRM observation DATE: 24/11/30 02:39:10 GMT FROM: Wang-Chen Xue <wcxuemail(a)gmail.com> SVOM/GRM team: Wang-Chen Xue, Chao Zheng, Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Jiang-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Wen-Long Zhang, Wen-Jun Tan, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Qiu Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao (IHEP), Maria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Tais Maiolino (LUPM), Frédéric Piron (LUPM), Stéphane Schanne (CEA), Jingwei Wang (IAP), JeanLuc Attéia (IRAP) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong (IHEP), Bing Zhang (UNLV) report on behalf of the SVOM team: During the commissioning phase, SVOM/GRM was triggered in-flight by a short burst (SVOM trigger reference: sb24112801) at 2024-11-28T05:22:24.000 UTC (T0). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a duration of about 10 s. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb241128B.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Wang-Chen Xue (IHEP)(xuewc(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/38388. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36380] GRB 241128A: Swift-BAT refined analysis
by GCN Circulars 30 Nov '24

30 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38387 SUBJECT: GRB 241128A: Swift-BAT refined analysis DATE: 24/11/30 02:20:35 GMT FROM: Amy <yarleen(a)gmail.com> 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/38387. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36379] GRB 241127A: Swift-BAT refined analysis
by GCN Circulars 30 Nov '24

30 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38386 SUBJECT: GRB 241127A: Swift-BAT refined analysis DATE: 24/11/30 02:05:21 GMT FROM: Amy <yarleen(a)gmail.com> D. M. Palmer (LANL), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), C. Salvaggio (INAF-OAB), T. Sakamoto (AGU) (i.e. the Swift-BAT team): Using the data set from T-50 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 241127A (trigger #1270788) (Salvaggio et al., GCN Circ. 38354). The BAT ground-calculated position is RA, Dec = 327.911, -56.652 deg which is RA(J2000) = 21h 51m 38.5s Dec(J2000) = -56d 39' 08.1" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows some weak emission that starts at ~T-21 s, followed by the main pulse that starts at ~T-1 s, peaks at ~T+1 s, and ends at ~T+9 s. T90 (15-350 keV) is 26.02 +- 3.63 sec (estimated error including systematics). The time-averaged spectrum from T-20.83 to T+9.13 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.10 +- 1.01, and Epeak of 19.0 +- 12.56 keV (chi squared 52.96 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.5 +- 0.8 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+0.09 sec in the 15-150 keV band is 2.3 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.65 +- 0.21 (chi squared 60.15 for 57 d.o.f.). 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/1270788 View this GCN Circular online at https://gcn.nasa.gov/circulars/38386. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36378] EP241126a: NOT optical observations
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38385 SUBJECT: EP241126a: NOT optical observations DATE: 24/11/29 22:23:22 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> Daniele B. Malesani (DAWN/NBI and Radboud Univ.), Peter G. Jonker (Radboud Univ.), Franz E. Bauer (PUC), Maria E. Ravasio (Radboud Univ.), Jonathan Quirola-Vasquez (Radboud Univ.), Javi Sanchez-Sierras (Radboud Univ.), Andrew J. Levan (Radboud Univ. and Warwick Univ.), on behalf of a larger collaboration, and Jacco H. Terwel (NOT and TCD), report: We observed the optical counterpart (Fu et al., GCN 38337; Li et al., GCN 38338; Geng et al., GCN 38357; Qiu et al., GCN 38378) of the X-ray transient EP241126a (Hu et al., GCN 38335; Zheng et al., GCN 38339), using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out in the SDSS r band and were unfortunately affected by "non-ideal" seeing (>2.5"). The mean time of our observation was 2024 Nov 27.836 UT, that is 24.4 hr after the EP trigger, and the total exposure time was 9x240 s. The optical counterpart is marginally detected in our stacked image, with a magnitude r = 23.4 +- 0.3 (AB, calibrated against nearby sources from the Pan-STARRS catalog). View this GCN Circular online at https://gcn.nasa.gov/circulars/38385. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36377] GRB 241127A: PRIME near-infrared detection
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38384 SUBJECT: GRB 241127A: PRIME near-infrared detection DATE: 24/11/29 19:31:33 GMT FROM: Joe Durbak at UMD <gcn.joedurbak(a)gmail.com> J. Durbak (UMD), E. Troja (U Rome), O. Guiffreda (UMD), A. S. Kutyrev (NASA/GSFC), S. B. Cenko (NASA/GSFC) Following the Swift BAT detection (GCN 38354), we observed the transient field in J and H filters with PRIME ~23 hours after Swift detection. At the position of the optical counterpart reported by Swift UVOT (GCN 38354), we detect an uncatalogued source in J-band. Using nearby VISTA Hemispherical Survey (VHS) for preliminary calibration we derive the following magnitude and limit, not corrected for Galactic extinction: | Filter | Mag(AB) | |--------|--------------| | J | 20.5 +/- 0.1 | | H | > 20.1 | PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa at the South African Astronomical Observatory (SAAO) (Kutyrev et al. 2023, Yama et al. 2023, Durbak et al. 2024). We thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/38384. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36376] GRB 241127A: PRIME near-infrared detection
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38384 SUBJECT: GRB 241127A: PRIME near-infrared detection DATE: 24/11/29 19:31:33 GMT FROM: Joe Durbak at UMD <gcn.joedurbak(a)gmail.com> J. Durbak (UMD), E. Troja (U Rome), O. Guiffreda (UMD), A. S. Kutyrev (NASA/GSFC), S. B. Cenko (NASA/GSFC) Following the Swift BAT detection (GCN 38354), we observed the transient field in J and H filters with PRIME ~23 hours after Swift detection. At the position of the optical counterpart reported by Swift UVOT (GCN 38354), we detect an uncatalogued source in J-band. Using nearby VISTA Hemispherical Survey (VHS) for preliminary calibration we derive the following magnitude and limit, not corrected for Galactic extinction: | Filter | Mag(AB) | |--------|--------------| | J | 20.5 +/- 0.1 | | H | > 20.1 | PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa at the South African Astronomical Observatory (SAAO) (Kutyrev et al. 2023, Yama et al. 2023, Durbak et al. 2024). We thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/38384. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36375] GRB 241128A: Mondy optical observations
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38383 SUBJECT: GRB 241128A: Mondy optical observations DATE: 24/11/29 16:03:19 GMT FROM: XXXX at IKI <alex(a)cgrsmx.iki.rssi.ru> 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/38383. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36374] GRB 241128A: GRANDMA and Kilonova-Catcher Optical Afterglow Detections and Upperlimits
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38382 SUBJECT: GRB 241128A: GRANDMA and Kilonova-Catcher Optical Afterglow Detections and Upperlimits DATE: 24/11/29 15:25:01 GMT FROM: Dalya Akl at American Uni. SHJ <dalyaakl.d(a)gmail.com> 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-Auger, 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-Auger | | 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/) View this GCN Circular online at https://gcn.nasa.gov/circulars/38382. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 36373] Swift-XRT observations of IceCube -241127A
by GCN Circulars 29 Nov '24

29 Nov '24

TITLE: GCN CIRCULAR NUMBER: 38381 SUBJECT: Swift-XRT observations of IceCube -241127A DATE: 24/11/29 14:11:26 GMT FROM: P.A. Evans at U. Leicester <pae9(a)leicester.ac.uk> P.A. Evans (U. Leicester) and J.A. Kennea (PSU) report on behalf of the Swift-XRT team, Swift-XRT observed the field of IceCube-241127A (IceCube Collaboration, GCN 38349) between 18:51 and 22:12 UT on 2024 November 27 (16.8 to 29.4 ks after the trigger), gathering 4.7 ks over 10 pointings centred on the neutrino position. One X-ray source is detected at a RA, Dec = 164.0502° 5.2615, which is equivalent to: RA (J2000) = 10h 56m 12.04s Dec (J2000) = +05d 15’ 41.3S" with an uncertainty of 8.4 arcseconds (radius, 90 confidence). This is consistent with the a known X-ray source from the Swift [LSXPS](https://www.swift.ac.uk/LSXPS/) catalogue: [LSXPS J105612.0+051546](https://www.swift.ac.uk/LSXPS/LSXPS%20J105612.0%2B051546); and the optical galaxy SDSS J105612.22+051544.6. The count-rate in the historical Swift data is 0.023 (+0.007, -0.006) ct/sec; in the new observations the count-rate is 0.015 (+0.006, -0.005); i.e. the source shows no signs of outburst. Three other objects were found, all of which are rated “poor” by the detection algorithm which corresponds to a ~1 sigma detection, their details are below (all positions in J2000, errors are arcseconds, 90% confidence). SWIFT J105542.0+051112 (source 2): RA: 10h 55m 42.04s (= 163.9252) Dec: +05d 11’ 12.1" (= +5.1867) Error: 7.0 This source is 2.1 arcseconds from the radio source NVSS J105542+051112. SWIFT J105615.1+051437 (source 3): RA: 10h 56m 15.13s (= 164.0630) Dec: +05d 14’ 37.7" (= +5.2438) Error: 8.2 SWIFT J105711.6+054504 (source 4): RA (J2000): 10h 57m 11.64s (= 164.2985) Dec (J2000): +05d 45’ 04.8" (= +5.7513) Error: 7.6 This source is 10.6 arseconds from the high proper-motion star PM J10571+0544A, and 13arcseconds from the Rosat source: 1RXS J105710.9+054458. The Rosat brightness is equivalent to 0.048 +/- 0.011 ct/sec in XRT (assuming a power-law spectrum, photon index 1.7, nH = 3e20 cm^-2); the XRT count-rate is 0.013 (+0.008, -0.006); this this possible source also shows no evidence for an outburst. The full XRT analysis can be viewed online at https://www.swift.ac.uk/neutrino/NEUTRINO_FIELD00042/. View this GCN Circular online at https://gcn.nasa.gov/circulars/38381. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0