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{
"count": 257459,
"next": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=600&ordering=topic",
"previous": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=400&ordering=topic",
"results": [
{
"id": 1753,
"topic": "gcn.circular",
"uuid": "f434b956-1257-4767-a33e-356196661330",
"title": "LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/08/02 02:20:05 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34310",
"subject": "LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT was observing 64.47 % of the GW localization probability (bayestar.multiorder.fits) at merger time. A fraction 5.72 % of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK 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).\n\nUpon 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.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n-------------------------------\n0.256 22.8 15.3 13.6 17.1\n1.024 11.6 7.8 6.9 8.7\n4.096 6.2 4.2 3.7 4.6\n16.384 3.8 2.6 2.3 2.9\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8206758\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.8206771\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTQyODEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ThPAUTIe6mbowNBb7K5zgSINQ61RPEb8_8wiMSvsBFk\n\n",
"published": "2023-08-02T02:20:16.502037Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T02:20:16.502054Z",
"modified": "2023-08-02T02:20:16.509006Z",
"nonlocalizedevents": [
{
"event_id": "S230731a"
}
],
"targets": []
},
{
"id": 1603,
"topic": "gcn.circular",
"uuid": "729d76b0-9324-4d8a-a2a0-6d1fb1e5b29f",
"title": "GRB 230728A: NOT optical observations and possible host galaxy",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/07/28 09:23:06 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"title": "GCN CIRCULAR",
"number": "34285",
"subject": "GRB 230728A: NOT optical observations and possible host galaxy"
},
"message_text": "D. Xu, S.Y. Fu, S.Q. Jiang, Z.P. Zhu (NAOC), Z. Gray (NOT), report:\n\nWe observed the field of GRB 230728A detected by Swift (Salvaggio et al., GCN 34282) using the the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 04:26:55 UT on 2023-07-28, i.e., ~ 1.61 hr after the Swift/BAT trigger, and 3x300 s Sloan r-filter images and 5x200 s Sloan z-filter images were obtained, respectively.\n\nNo optical source is detected within or at the border of the Swift/XRT error circle (radius ~1.9 arcsec, 90% containment, Salvaggio et al., GCN 34282) down to upper limits of r > 24.2 mag (5-sigma) and z > 23.0 mag (5-sigma).\n\nWe note that there exists a galaxy south-western, ~3.7 arcsec away from the center of the Swift/XRT error circle. This galaxy is present in SDSS with r ~ 22.39 mag, z ~ 22.99 mag, z_phot ~ 0.34, and in Legacy Survey with r ~ 22.14 mag, z ~ 22.04 mag, z_phot ~ 0.37, respectively. Preliminary photometry of the galaxy from the NOT data gives r ~ 22.4 mag and z ~ 23.0 mag, which are consistent with the above archival values, indicating that there is no prominent optical afterglow in this potential host galaxy.\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNTM2MTkxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7gHtWFSI3Gjscfms9YnemVAMv-TZW2JAvgwZd_9HSM0\n\n",
"published": "2023-07-28T09:23:16.384248Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-28T09:23:16.384265Z",
"modified": "2023-07-28T09:23:16.389877Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1604,
"topic": "gcn.circular",
"uuid": "1485911f-c9da-49e0-93b2-76af4190516f",
"title": "GRB 230728A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/07/28 11:08:36 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34286",
"subject": "GRB 230728A: Enhanced Swift-XRT position"
},
"message_text": "P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1173 s of XRT Photon Counting mode data and 2 UVOT\nimages for GRB 230728A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 343.51572, +28.17433 which is equivalent\nto:\n\nRA (J2000): 22h 54m 3.77s\nDec (J2000): +28d 10' 27.6\"\n\nwith an uncertainty of 2.1 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNTQyNTIxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.GsFR5QPzPI1o51h2ptKl1lCynaQKgJOgWMk_u4FCLZw\n\n",
"published": "2023-07-28T11:08:47.008606Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-28T11:08:47.008635Z",
"modified": "2023-07-28T11:08:47.015062Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1605,
"topic": "gcn.circular",
"uuid": "36a27dfa-1350-42de-b780-a0932c9635f4",
"title": "GRB 230728A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/07/28 12:26:15 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34287",
"subject": "GRB 230728A: Swift-XRT refined Analysis"
},
"message_text": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), B. Sbarufatti\n(INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), J. D. Gropp\n(PSU), S. Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore (U.\nLeicester) and P.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.7 ks of XRT data for GRB 230728A, from 86 s to 28.9\nks after the BAT trigger. The data comprise 94 s in Windowed Timing\n(WT) mode (the first 3 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode.\n\nThe late-time light curve (from T0+5.6 ks) can be modelled with a\npower-law decay with a decay index of alpha=1.19 (+0.20, -0.22).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.97 (+0.24, -0.23). The\nbest-fitting absorption column is 4.4 (+1.4, -1.2) x 10^21 cm^-2, in\nexcess of the Galactic value of 6.3 x 10^20 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 2.04 (+0.19, -0.18)\nand a best-fitting absorption column of 7.0 (+1.5, -1.3) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum is 4.3 x 10^-11 (7.6 x 10^-11) erg cm^-2\ncount^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 7.0 (+1.5, -1.3) x 10^21 cm^-2\nGalactic foreground: 6.3 x 10^20 cm^-2\nExcess significance: 8.1 sigma\nPhoton index:\t 2.04 (+0.19, -0.18)\n\nIf the light curve continues to decay with a power-law decay index of\n1.19, the count rate at T+24 hours will be 6.2 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.6 x\n10^-13 (4.7 x 10^-13) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01181187.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNTQ3MTgwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4XPXhbr0mwjqQ7mCDEhGP4QuCyznx2X3pD-Eizpl2zE\n\n",
"published": "2023-07-28T12:26:25.846380Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-28T12:26:25.846398Z",
"modified": "2023-07-28T12:26:25.854258Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1606,
"topic": "gcn.circular",
"uuid": "ce074f3a-ebd0-4de1-98bd-a34013263f18",
"title": "GRB 230728A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
"data": {
"date": "23/07/28 14:37:00 GMT",
"from": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34288",
"subject": "GRB 230728A: Swift/UVOT Upper Limits"
},
"message_text": "S. R. Oates (U. Birmingham) and C. Salvaggio (INAF-OAB)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230728A\n100 s after the BAT trigger (Salvaggio et al., GCN Circ. 34282).\nNo optical afterglow consistent with the XRT position (Evans et al.,\nGCN Circ. 34286) is detected in the initial UVOT exposures.\n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 100 250 147 >20.9\nu_FC 312 562 246 >20.1\nwhite 100 1361 372 >21.1\nv 641 5845 274 >19.4\nb 567 1338 78 >19.5\nu 312 1313 304 >20.0\nw1 691 1289 58 >18.5\nm2 5851 6048 194 >19.5\nw2 1023 1380 52 >18.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.080 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNTU1MDI2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.DSHIbP4eXfHgR2aF5fR0AAzQKj7OU9IzKKFB9S31DzA\n\n",
"published": "2023-07-28T14:37:11.625828Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-28T14:37:11.625865Z",
"modified": "2023-07-28T14:37:11.631618Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1608,
"topic": "gcn.circular",
"uuid": "932eac9e-677d-4250-9367-cf1687774395",
"title": "GRB 230728A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/07/28 18:51:37 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34290",
"subject": "GRB 230728A: Fermi GBM Observation"
},
"message_text": "S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 02:50:05.24 UT on 28 July 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230728A (trigger 712205410/230728118).\nwhich was also detected by Swift BAT (Salvaggio et al. 2023, GCN 34282) and Swift XRT (Evans et al. 2023, GCN 34286).\nThe Fermi GBM on-ground location is consistent with the Swift XRT position.\n\nThe angle from the Fermi LAT boresight is 66 degrees.\n\nThe GBM light curve consists of multiple peaks with a duration (T90)\nof about 19 s (50-300 keV). The time-averaged spectrum\nfrom T0-6.1 to T0+12.3 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.2 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 95 +/- 15 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.7 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-2.6 s in the 10-1000 keV band is 3.1 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 78 +/- 20 keV, alpha = -1.1 +/- 0.3 and beta = -2.4 +/- 0.4.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNTcwMzAyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.TtYdedONIZ-Q39MNnyjy3EHKHa6GIWyFuoXDdMK1dyM\n\n",
"published": "2023-07-28T18:51:52.800277Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-28T18:51:52.800305Z",
"modified": "2023-07-28T18:51:52.806299Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1609,
"topic": "gcn.circular",
"uuid": "c6a360b3-8882-4f55-af53-837556e2bdcd",
"title": "GRB 230728A: BOOTES-1 optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/07/28 19:11:16 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34291",
"subject": "GRB 230728A: BOOTES-1 optical upper limit"
},
"message_text": "Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia and S. Guziy (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco and A. Reina (Univ. de Malaga) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 230728A by Swift (Salvaggio et al., GCNC 34282), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva, Spain) automatically responded to this burst on Jul. 28 at 02:50:54 UT (i.e. ~51 s after trigger). In the co-added frame (60 x 10 s, clear filter), no source is detected within the enhanced XRT position (Evans et al., GCNC 34286) down to 19.9 mag.\n\nThis non-detection is consistent with the upper limits reported by MASTER (Lipunov et al. GCNC 34281), NOT (Xu et al. GCNC 34285), UVOT (Oates et al. GCNC 34288) and LCOGT (Strausbaugh et al. GCNC 34289).\n\nWe thank the staff at INTA-CEDEA for their excellent support.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNTcxNDgyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.O4oWrt9TcWHWCO5dHEGT3GBT78qjwFlxcquaMuZfdSY\n\n",
"published": "2023-07-28T19:11:28.166461Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-28T19:11:28.166480Z",
"modified": "2023-07-28T19:11:28.170643Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2506,
"topic": "gcn.circular",
"uuid": "8ee0f747-b3e1-4028-994b-da818271a127",
"title": "GRB 230826A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/27 07:26:29 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34568",
"subject": "GRB 230826A: Swift-XRT refined Analysis"
},
"message_text": "J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U.\nLeicester), K.L. Page (U. Leicester), M. Capalbi (INAF-IASFPA), M.\nPerri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), D.N. Burrows\n(PSU) and P.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 8.3 ks of XRT data for GRB 230826A, from 65 s to 29.5\nks after the BAT trigger. The data comprise 56 s in Windowed Timing\n(WT) mode (the first 8 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode. The refined XRT position is RA,\nDec = 83.0642, +66.1244 which is equivalent to:\n\nRA (J2000): 05 32 15.41\nDec(J2000): +66 07 27.9\n\nwith an uncertainty of 3.5 arcsec (radius, 90% confidence).\n\nThe light curve can be modelled with a series of power-law decays. The\ninitial decay index is alpha=3.44 (+0.25, -0.24). At T+213 s the decay\nflattens to an alpha of -0.06 (+0.24, -0.26) before breaking again at\nT+1264 s to a final decay with index alpha=1.39 (+0.22, -0.14).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 2.93 (+0.32, -0.29). The\nbest-fitting absorption column is 4.7 (+1.0, -0.9) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.5 x 10^21 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 2.15 (+0.22, -0.21)\nand a best-fitting absorption column of 4.4 (+1.1, -1.0) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum is 3.6 x 10^-11 (6.3 x 10^-11) erg cm^-2\ncount^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 4.4 (+1.1, -1.0) x 10^21 cm^-2\nGalactic foreground: 1.5 x 10^21 cm^-2\nExcess significance: 4.8 sigma\nPhoton index:\t 2.15 (+0.22, -0.21)\n\nIf the light curve continues to decay with a power-law decay index of\n1.39, the count rate at T+24 hours will be 2.8 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.0 x\n10^-13 (1.8 x 10^-13) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01187463.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTIxMTk0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.IkN5xbnIvIQAb4W8rf8CTTvXs_nFbLr_MGRncQggpls\n\n",
"published": "2023-08-27T07:26:43.949226Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T07:26:43.949244Z",
"modified": "2023-08-27T07:26:43.953456Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1616,
"topic": "gcn.circular",
"uuid": "76acf171-43b9-409a-a2d2-05a32338c67f",
"title": "IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/07/29 04:24:42 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "34292",
"subject": "IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-230727A (https://gcn.nasa.gov/circulars/34276) in a time range of 1000 seconds centered on the alert event time (2023-07-27 15:57:19.630 UTC to 2023-07-27 16:13:59.630 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-230727A. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-230727A is 1.3e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 3e+02 GeV and 1e+05 GeV.\n\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2023-07-26 16:05:39.630 UTC to 2023-07-28 16:05:39.630 UTC). In this case, we report a p-value of 0.10, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-230727A is 1.5e-01 GeV cm^-2 in a 2 day time window.\n\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu<mailto:roc@icecube.wisc.edu>.\n\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNjA0Njg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.e902sKONzdIALevuLRzLTyQUQ9cPPQWzPxpT73ilJiU\n\n",
"published": "2023-07-29T04:24:56.627678Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-29T04:24:56.627705Z",
"modified": "2023-07-29T04:24:56.639226Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1632,
"topic": "gcn.circular",
"uuid": "b14295a4-0030-48aa-8702-696c0649082c",
"title": "LIGO/Virgo/KAGRA S230729z: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Angélique Lartaux at IJCLab <angelique.lartaux@ijclab.in2p3.fr>",
"data": {
"date": "23/07/29 11:17:18 GMT",
"from": "Angélique Lartaux at IJCLab <angelique.lartaux@ijclab.in2p3.fr>",
"title": "GCN CIRCULAR",
"number": "34293",
"subject": "LIGO/Virgo/KAGRA S230729z: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230729z during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-29 08:23:17.201 UTC (GPS\ntime: 1374654215.201). The candidate was found by the GstLAL\n[1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS230729z is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.4e-09 Hz, or about one in 9\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230729z\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [4] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [4] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is 6%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [5], distributed via GCN notice about 35 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [5], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n1428 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1546 +/- 472 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chatterjee et al. ApJ 896, 54 (2020)\n [5] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNjI5NDQ0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LYSft8Hz4luqryduOt_fU6wMWRpmCosnC3tdwzbKYMM\n\n",
"published": "2023-07-29T11:17:31.552325Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-29T11:17:31.552348Z",
"modified": "2023-07-29T11:17:31.557843Z",
"nonlocalizedevents": [
{
"event_id": "S230729z"
}
],
"targets": []
},
{
"id": 1639,
"topic": "gcn.circular",
"uuid": "7259e96f-4a26-41cb-ab77-5a5ff84c7342",
"title": "IceCube-230727A: No candidates from the Zwicky Transient Facility",
"submitter": "Hop gcn.circular",
"authors": "Jannis Necker at DESY <jannis.necker@desy.de>",
"data": {
"date": "23/07/29 15:47:21 GMT",
"from": "Jannis Necker at DESY <jannis.necker@desy.de>",
"title": "GCN CIRCULAR",
"number": "34294",
"subject": "IceCube-230727A: No candidates from the Zwicky Transient Facility"
},
"message_text": "Jannis Necker (DESY), Simeon Reusch (DESY), Robert Stein (Caltech), Sven Weimann (Ruhr University Bochum) and Anna Franckowiak (DESY/Ruhr University Bochum) report:\n\nOn behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations:\n\nAs part of the ZTF neutrino follow up program (Stein et al. 2022), we observed the localization region of the neutrino event IceCube-230727A (Blaufuss et. al, GCN 34276) with the Palomar 48-inch telescope, equipped with the 47 square degree ZTF camera (Bellm et al. 2019, Graham et al. 2019). We started observations in the g- and r-band beginning at 2023-07-28 09:54 UTC, approximately 17.8 hours after event time. We covered 72.1% (1.7 sq deg) of the reported localization region. This estimate accounts for chip gaps. Each exposure was 300s with a typical depth of 21.0 mag.\n\nThe images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019, Stein et al. 2021) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019).\n\nNo candidate counterparts were detected.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France.\n\nGROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.\nAlert distribution service provided by DIRAC@UW (Patterson et al. 2019).\nAlert database searches are done by AMPEL (Nordin et al. 2019).\nAlert filtering is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNjQ1NjQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.DbyDO_zMkdRkdxHcVwy1CCNKroQeXEYEltDLQibM4yM\n\n",
"published": "2023-07-29T15:47:36.330260Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-29T15:47:36.330280Z",
"modified": "2023-07-29T15:47:36.337371Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1791,
"topic": "gcn.circular",
"uuid": "a402a5ab-45f4-4c86-8b4b-28d97cdb8b6b",
"title": "LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation",
"submitter": "Hop gcn.circular",
"authors": "Volodymyr Savchenko at ISDC, University of Geneva; LASTRO, EPFL <volodymyr.savchenko@unige.ch>",
"data": {
"date": "23/08/02 15:00:06 GMT",
"from": "Volodymyr Savchenko at ISDC, University of Geneva; LASTRO, EPFL <volodymyr.savchenko@unige.ch>",
"title": "GCN CIRCULAR",
"number": "34316",
"subject": "LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation"
},
"message_text": "V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland)\nJ. Rodi (IAPS-Roma, Italy)\nA. Coleiro (APC, France)\nS. Mereghetti (INAF IASF-Milano, Italy)\n\non behalf of the INTEGRAL multi-messenger collaboration:\nhttps://www.astro.unige.ch/cdci/integral-multimessenger-collaboration\n\nUsing INTEGRAL/SPI-ACS realtime data (following [1]) we have performed\na search for a prompt gamma-ray counterpart of S230802aq (GCN 34314).\n\nAt the time of the event (2023-08-02 11:33:59 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the event localization probability was at an angle of 75 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed (21% of optimal) response of ISGRI, somewhat suppressed (44% of optimal) response of IBIS/Veto, and near-optimal (89% of optimal) response of SPI-ACS.\nWe note that due to large localization uncertainty, sensitivity is strongly dependent on the actual source location within the uncertainty.\n\nThe background within +/-300 seconds around the event was rather stable (excess variance 1.2).\n\nWe have performed a search for any impulsive events in INTEGRAL SPI-ACS (as described in [2]) data.\n\nWe do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 1.8e-07 erg/cm^2 (within the 50% probability containment region of the source localization) for a burst lasting less than 1 s with a characteristic short GRB spectrum (an exponentially cut off power law with alpha=-0.5 and Ep`0 keV) occurring at any time in the interval within 300 s around T0. For a typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and Ep00 keV), the derived peak flux upper limit is ~1.5e-07 (4.2e-08) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range.\n\nWe report for completeness and in order of FAP, all excesses identified in the search region. We find: 6 likely background\nexcesses:\n\nT-T0 | scale | S/N | flux ( x 1e-06 erg/cm2/s) | FAP\n13.9 | 0.05 | 4.2 | 1.77 +/- 0.528 +/- 1.39 | 0.402\n92.8 | 1.15 | 3.6 | 0.323 +/- 0.106 +/- 0.253 | 0.46\n-3.22 | 0.05 | 3.3 | 1.4 +/- 0.523 +/- 1.1 | 0.516\n252 | 2.5 | 3.5 | 2.14 +/- 0.72 +/- 1.68 | 0.695\n-14 | 0.1 | 3.6 | 1.08 +/- 0.367 +/- 0.843 | 0.782\n73.7 | 0.35 | 3.8 | 0.606 +/- 0.194 +/- 0.475 | 0.865\n\nNote that FAP estimates (especially at timescales above 2s) may be possibly further affected by enhanced non-stationary local background noise. This list excludes any excesses for which FAP is close to unity.\n\nWe note that no independent IBAS alerts happened in the viscinity.\n\n\nAll results quoted are preliminary.\n\nThis circular is an official product of the INTEGRAL Multi-Messenger team.\n\nNote that we send GCNs Circulars only when one of the following\nconditions is met: merger contains at least one neutron star, a\nsingificant counterpart is reported.\n\n[1] Savchenko et al. 2017, A&A 603, A46 [2] Savchenko et al. 2012, A&A\n541A, 122S\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTg4NDEyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.w-BCGdD9qFmICU4KuGW_ZnPZzDZYF5ehu2wnXimvYbU\n\n",
"published": "2023-08-02T15:00:22.797299Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T15:00:22.797316Z",
"modified": "2023-08-02T15:00:22.803973Z",
"nonlocalizedevents": [
{
"event_id": "S230802a"
}
],
"targets": []
},
{
"id": 1808,
"topic": "gcn.circular",
"uuid": "5c0f697f-fe5a-4f31-a406-6bf6609f3354",
"title": "Fermi trigger No 712798043: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/04 00:31:18 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34331",
"subject": "Fermi trigger No 712798043: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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 GRB230803.98 (trigger No 712798043,03h 14m 57.60s , -33d 52m 47.6s, R=4.4) errorbox 576 sec after notice time and 608 sec after trigger time at 2023-08-03 23:37:26 UT, with upper limit up to 15.6 mag. The observations began at zenith distance = 68 deg. The sun altitude is -71.2 deg.\n\nThe galactic latitude b = -58 deg., longitude l = 234 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"49535\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 638 | 2023-08-03 23:37:26 | MASTER-SAAO | (03h 22m 04.45s , -33d 44m 25.7s) | C | 60 | 15.6 |\n 638 | 2023-08-03 23:37:26 | MASTER-SAAO | (03h 21m 06.33s , -33d 43m 44.1s) | C | 60 | 15.2 |\n 718 | 2023-08-03 23:38:45 | MASTER-SAAO | (03h 21m 59.43s , -33d 45m 01.6s) | C | 60 | 14.0 |\n 718 | 2023-08-03 23:38:45 | MASTER-SAAO | (03h 21m 01.34s , -33d 44m 20.6s) | C | 60 | 13.3 |\n 1582 | 2023-08-03 23:53:10 | MASTER-SAAO | (03h 13m 52.24s , -34d 07m 25.5s) | C | 60 | 12.9 |\n 1582 | 2023-08-03 23:53:10 | MASTER-SAAO | (03h 12m 53.62s , -34d 06m 52.5s) | C | 60 | 12.1 |\n 1673 | 2023-08-03 23:54:41 | MASTER-SAAO | (03h 13m 58.82s , -34d 07m 23.1s) | C | 60 | 13.1 |\n 1843 | 2023-08-03 23:57:31 | MASTER-SAAO | (03h 13m 55.04s , -34d 07m 13.9s) | C | 60 | 14.1 |\n 1843 | 2023-08-03 23:57:31 | MASTER-SAAO | (03h 12m 56.59s , -34d 06m 43.3s) | C | 60 | 13.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTA5MDgzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SE-avRlDTR8xuw6n7xgCKv4ozclFK6WMywaMljoR10Y\n\n",
"published": "2023-08-04T00:31:31.322537Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T00:31:31.322560Z",
"modified": "2023-08-04T00:31:31.328972Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2509,
"topic": "gcn.circular",
"uuid": "0079b365-c37d-43c7-b906-b0f442e4b5be",
"title": "GRB 230826A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/27 07:40:11 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34569",
"subject": "GRB 230826A: Enhanced Swift-XRT position"
},
"message_text": "J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1910 s of XRT Photon Counting mode data and 5 UVOT\nimages for GRB 230826A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 83.06410, +66.12384 which is equivalent\nto:\n\nRA (J2000): 05h 32m 15.38s\nDec (J2000): +66d 07' 25.8\"\n\nwith an uncertainty of 2.0 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTIyMDE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.IHL9f2dbHvJjT0Y5OjXEepRIxNjwdMJB7rdNu20XDmU\n\n",
"published": "2023-08-27T07:40:23.012064Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T07:40:23.012083Z",
"modified": "2023-08-27T07:40:23.015832Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1668,
"topic": "gcn.circular",
"uuid": "9e782f15-a87d-45e2-9f12-2a762ec08d4e",
"title": "GRB 230723B: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "23/07/30 13:50:12 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34297",
"subject": "GRB 230723B: Swift-BAT refined analysis"
},
"message_text": "T. Sakamoto (AGU), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+60 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230723B (trigger #1180410)\n(Page, et al., GCN Circ. 34234). The BAT ground-calculated position is\nRA, Dec = 250.391, -5.319 deg which is\n RA(J2000) = 16h 41m 33.8s\n Dec(J2000) = -05d 19' 08.1\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 39%.\n\nThe light curve shows a fast rise exponential decay type profile.\nT90 (15-350 keV) is 6.64 +- 0.81 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.22 to T+7.94 sec is best fit by a power law\nwith an exponential cutoff. This fit gives a photon index 1.09 +- 0.38,\nand Epeak of 65.9 +- 15.8 keV (chi squared 41.57 for 56 d.o.f.). For this\nmodel the total fluence in the 15-150 keV band is 1.7 +- 0.1 x 10^-06 erg/cm2\nand the 1-sec peak flux measured from T+1.64 sec in the 15-150 keV band is\n5.1 +- 0.5 ph/cm2/sec. A fit to a simple power law gives a photon index\nof 1.77 +- 0.08 (chi squared 52.21 for 57 d.o.f.). All the quoted errors\nare at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1180410/BA/\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNzI1MDE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.CeoUkUEJYVmqCJ5Q95vqPfE-c50Uaierw4qeFrWGUsw\n\n",
"published": "2023-07-30T13:50:24.322226Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-30T13:50:24.322245Z",
"modified": "2023-07-30T13:50:24.327807Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1675,
"topic": "gcn.circular",
"uuid": "857b1ff9-1f1b-4566-8373-027f9a26326c",
"title": "Fermi-LAT gamma-ray observations of IceCube-230727A",
"submitter": "Hop gcn.circular",
"authors": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"data": {
"date": "23/07/30 20:23:26 GMT",
"from": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"title": "GCN CIRCULAR",
"number": "34298",
"subject": "Fermi-LAT gamma-ray observations of IceCube-230727A"
},
"message_text": "S. Garrappa (Weizmann Institute of Science), C. Bartolini (INFN Bari), S. Buson (Uni Wuerzburg) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the IC230727A high-energy neutrino event (GCN 34276) 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 2023-07-27 at 16:05:39.63 UT (T0) with J2000 position RA = 33.66 (+1.16, -0.77) deg, Decl. = 7.63 (+0.70, -0.64) deg (90% PSF containment). There are no Fermi 4FGL-DR4 cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53; Ballet et al. 2023, arXiv:2307.12546) sources in the 90% IC230727A uncertainty localization region.\n\nWe 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 IC230727A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC230727A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.2e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2023-07-27 UTC), and < 4.1e-9 (< 6.0e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.\n\n\nSince Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at weizmann.ac.il), C. Bartolini (chiara.bartolini at ba.infn.it), S. Buson (sara.buson at uni-wuerzburg.de) and J. Sinapius (jonas.sinapius at desy.de).\n\nThe 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.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNzQ4NjEyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.j9Ul-cTDtJA5vTIbJNc2QkT9F5IaWS_J73i5QPvr1IE\n\n",
"published": "2023-07-30T20:23:42.075354Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-30T20:23:42.075374Z",
"modified": "2023-07-30T20:23:42.082783Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1692,
"topic": "gcn.circular",
"uuid": "49d66604-8bae-428a-97f7-3adc5f78016d",
"title": "GRB 230728A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "23/07/31 12:57:17 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34299",
"subject": "GRB 230728A: Swift-BAT refined analysis"
},
"message_text": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC),\n\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\n\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\n\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\n\nT. Sakamoto (AGU), (i.e. the Swift-BAT team):\n\n\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink,\n\nwe report further analysis of BAT GRB 230728A (trigger #1181187)\n\n(Salvaggio, et al., GCN Circ. 34282). The BAT ground-calculated position is\n\nRA, Dec = 343.514, 28.169 deg which is\n\n RA(J2000) = 22h 54m 03.4s\n\n Dec(J2000) = +28d 10' 09.5\"\n\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\n\nThe partial coding was 49%.\n\n\n\nHe mask-weighted light curve shows a complex multi-peaked structure with some\n\nemission prior to the trigger time.\n\nT90 (15-350 keV) is 15.10 +- 0.89 sec (estimated error including systematics).\n\n\n\nThe time-averaged spectrum from T-5.62 to T+10.74 sec is best fit by a simple\n\npower-law model. The power law index of the time-averaged spectrum is\n\n1.58 +- 0.13. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-06 erg/cm2.\n\nThe 1-sec peak photon flux measured from T+0.41 sec in the 15-150 keV band\n\nis 2.5 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence\n\nlevel.\n\n\n\nThe results of the batgrbproduct analysis are available at\n\nhttp://gcn.gsfc.nasa.gov/notices_s/1181187/BA/\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODA4MjQyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.X1D1Z1zeVafMKkMfuaOAgM2I9ERuTzSnAamNX4Mplks\n\n",
"published": "2023-07-31T12:57:33.216786Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T12:57:33.216813Z",
"modified": "2023-07-31T12:57:33.222412Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1693,
"topic": "gcn.circular",
"uuid": "a182ada2-8c1c-4108-9ae5-0d77d1aab271",
"title": "Fermi trigger No 712390645: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/07/31 15:47:35 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34300",
"subject": "Fermi trigger No 712390645: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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) started inspect of the Fermi GRB230730.26 (trigger No 712390645,13h 39m 00.00s , +32d 54m 00.0s, R3.9) errorbox 1 days 29758 sec after notice time and 1 days 29791 sec after trigger time at 2023-07-31 14:33:51 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 74 deg. The sun altitude is -12.4 deg.\n\nThe galactic latitude b = 78 deg., longitude l = 63 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"47493\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 116222 | 2023-07-31 14:33:51 | MASTER-Tunka | (12h 01m 31.40s , +20d 20m 14.0s) | C | 60 | 16.8 |\n 116308 | 2023-07-31 14:35:18 | MASTER-Tunka | (11h 54m 21.62s , +22d 12m 47.3s) | C | 60 | 16.2 |\n 116982 | 2023-07-31 14:46:32 | MASTER-Tunka | (11h 54m 28.70s , +22d 12m 35.0s) | C | 60 | 16.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODE4NDYxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.1B-rashnXjXhvVX0_LJMIhWKfAsSUrHMfFZEO4kWQyM\n\n",
"published": "2023-07-31T15:47:51.226853Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T15:47:51.226882Z",
"modified": "2023-07-31T15:47:51.233071Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4052,
"topic": "gcn.circular",
"uuid": "fcfa767b-aec6-447f-9d27-a44ef6af3c83",
"title": "GRB 231020A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/10/20 19:04:32 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34856"
},
"title": "GCN CIRCULAR",
"number": "34856",
"subject": "GRB 231020A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 18:56:58 UT on 20 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231020A (trigger 719521023.300322 / 231020790).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 317.5, Dec = -28.7 (J2000 degrees, equivalent to J2000 21h 10m, -28d 41'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 87.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020790/quicklook/glg_skymap_all_bn231020790.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020790/quicklook/glg_healpix_all_bn231020790.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020790/quicklook/glg_lc_medres34_bn231020790.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34856.",
"published": "2023-10-20T19:04:43.437197Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T19:04:43.437227Z",
"modified": "2023-10-20T19:04:43.445072Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1696,
"topic": "gcn.circular",
"uuid": "9e44d76f-70e9-494f-bcc1-cd9965de1c48",
"title": "GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G",
"submitter": "Hop gcn.circular",
"authors": "Sam Guns at S Pole Telescope & UC Berkeley <sguns@berkeley.edu>",
"data": {
"date": "23/07/31 19:40:10 GMT",
"from": "Sam Guns at S Pole Telescope & UC Berkeley <sguns@berkeley.edu>",
"title": "GCN CIRCULAR",
"number": "34301",
"subject": "GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G"
},
"message_text": "S. Guns (UC Berkeley), A. Foster (CWRU), C. Tandoi (UIUC), K. Phadke (UIUC), N. Whitehorn (MSU), G. Holder (UIUC), J. Vieira (UIUC) on behalf of the South Pole Telescope Collaboration:\n\nOn 26 July 2023 at 16:48 UTC the South Pole Telescope detected a millimeter-band transient candidate at RA = 43.5275, Dec = -70.4770 (J2000 degrees, uncertainty 12 arcseconds) using the SPT-3G camera in 2 bands centered at 95 GHz and 150 GHz. Peak emission was observed two hours later at 19:14 UTC with flux levels of 18.5 mJy in both bands, after which the SPT slewed away from the observing field. The next series of observations on 28 July showed flux levels consistent with zero. The spatial location of the emission is consistent (1.5 sigma) with GRB 230723A which was detected by Fermi-GBM on 23 July 2023 at RA = 21.0, Dec = -71.2 (J2000 degrees, uncertainty 4.8 degrees). From the SPT-3G transients program, short duration (<1 week) millimeter-band transients that are not associated with nearby stars are rare (<3 events per year). A table of SPT-3G observations is given below.\n\nThe lightcurve can be found at:\nhttps://pole.uchicago.edu/public/data/transients/lightcurves/SPT-SVJ025406.5-702837.png\n\nObservation time | Flux (95 GHz) | Error (95 GHz) | Flux (150 GHz) | Error (150 GHz)\n2023-7-22 05:04 UTC | -3.0 mJy | 2.5 mJy | -3.3 mJy | 3.0 mJy\n2023-7-26 16:48 UTC | 13.3 mJy | 4.4 mJy | 14.0 mJy | 4.9 mJy\n2023-7-26 19:14 UTC | 18.5 mJy | 4.4 mJy | 18.5 mJy | 4.9 mJy\n2023-7-28 08:12 UTC | 1.7 mJy | 2.5 mJy | 1.8 mJy | 2.8 mJy\n\nThe South Pole Telescope is a 10-meter telescope located at Amundsen-Scott South Pole Station and supported by the National Science Foundation and the US Dept. of Energy. The SPT online transient program providing data in this circular is supported by NSF grants AST-1716965 and OPP 1852617, and observes 1500 square degrees of the southern sky at 95, 150, and 220 GHz with an average revisit cadence of 12 hours. For more details on the SPT transient program and survey strategy, please see https://arxiv.org/abs/2103.06166.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODMyNDE2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.gX1UfB3z1tt_3z8gtkoeyd3Ri5uSRA2PnaAXry3h0pI\n\n",
"published": "2023-07-31T19:40:21.673839Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T19:40:21.673857Z",
"modified": "2023-07-31T19:40:21.681131Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1697,
"topic": "gcn.circular",
"uuid": "74ed23be-8f46-4cbe-b8d4-fb6c7c4ebc99",
"title": "LIGO/Virgo/KAGRA S230729z: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Christopher P L Berry at LVK Collaboration <christopher.berry@ligo.org>",
"data": {
"date": "23/07/31 19:51:04 GMT",
"from": "Christopher P L Berry at LVK Collaboration <christopher.berry@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34302",
"subject": "LIGO/Virgo/KAGRA S230729z: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230729z (GCN Circular 34293). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the\nGraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230729z\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1945 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1495 +/- 444 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODMzMDcwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.HsMeeJyj3s_h3f5hf7-KM59aNn_VZAtn3bXXozC1V0I\n\n",
"published": "2023-07-31T19:51:15.820188Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T19:51:15.820205Z",
"modified": "2023-07-31T19:51:15.826333Z",
"nonlocalizedevents": [
{
"event_id": "S230729z"
}
],
"targets": []
},
{
"id": 1703,
"topic": "gcn.circular",
"uuid": "0768a4a0-96ed-4b18-9140-f944ce6debba",
"title": "LIGO/Virgo/KAGRA S230731an: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "J. C. Driggers at California Institute of Technology, LIGO Hanford Observatory <jenne@caltech.edu>",
"data": {
"date": "23/07/31 22:22:25 GMT",
"from": "J. C. Driggers at California Institute of Technology, LIGO Hanford Observatory <jenne@caltech.edu>",
"title": "GCN CIRCULAR",
"number": "34303",
"subject": "LIGO/Virgo/KAGRA S230731an: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230731an during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-31 21:53:07.889 UTC (GPS\ntime: 1374875605.889). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230731an is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230731an\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (70%), NSBH (15%), Terrestrial (15%), or BNS\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is 5%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 30 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is 646\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 1056 +/- 279 Mpc (a posteriori mean +/- standard\ndeviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODQyMTUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-Hjcf58CxPOGn5Md5q6m1YAUvSOiDwsvRwJ3kz_VJOE\n\n",
"published": "2023-07-31T22:22:35.423033Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T22:22:35.423049Z",
"modified": "2023-07-31T22:22:35.429419Z",
"nonlocalizedevents": [
{
"event_id": "S230731a"
}
],
"targets": []
},
{
"id": 1706,
"topic": "gcn.circular",
"uuid": "004b23f8-6b0c-4488-83ba-61c92852e27a",
"title": "LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
"data": {
"date": "23/07/31 23:47:05 GMT",
"from": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34304",
"subject": "LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "M. Nakajima, H. Negoro, (Nihon U.),\nT. Mihara, N. Kawai (RIKEN),\nS. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nY. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S230731an at 2023-07-31 21:53:07\nUTC (GCN 34303).\n\nAt the trigger time of S230731an, the high-voltage of MAXI/GSC was off,\nand it was turned on at T0+628 sec (+10.5 min).\nThe first one-orbit (92 min) scan observation with GSC after the event\ncovered 95%\nof the 90% credible region of the bayestar skymap from 22:03:35 to\n23:07:43 UTC (T0+628 to T0+4476 sec).\n\nNo significant new source was found in the region in the one-orbit\nscan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODQ3MjMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.2XC1V5mgX84oDco_6L3Ypmxd71ljdygnnmTuzfqOPRI\n\n",
"published": "2023-07-31T23:47:16.044291Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T23:47:16.044318Z",
"modified": "2023-07-31T23:47:16.052954Z",
"nonlocalizedevents": [
{
"event_id": "S230731a"
}
],
"targets": []
},
{
"id": 1707,
"topic": "gcn.circular",
"uuid": "8423dc32-a98d-42d9-adc9-a73d2f288023",
"title": "GRB 230731A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/07/31 23:49:46 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34305",
"subject": "GRB 230731A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:39:16 UT on 31 Jul 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230731A (trigger 712539561.432998 / 230731986).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 237.3, Dec = -58.9 (J2000 degrees, equivalent to J2000 15h 49m, -58d 53'), with a statistical uncertainty of 8.3 degrees.\n\nThe angle from the Fermi LAT boresight is 111.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230731986/quicklook/glg_skymap_all_bn230731986.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230731986/quicklook/glg_healpix_all_bn230731986.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230731986/quicklook/glg_lc_medres34_bn230731986.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODQ3Mzg4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JQjGm3ufMdDMuxY_DGnnC3M_mXdbcSDwaL0f-0FrQ4w\n\n",
"published": "2023-07-31T23:49:53.431827Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T23:49:53.431844Z",
"modified": "2023-07-31T23:49:53.438148Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1709,
"topic": "gcn.circular",
"uuid": "9965bee8-0cf2-470c-8497-44e684a8f38a",
"title": "LIGO/Virgo/KAGRA S230731an: Updated Sky Localization and EM Bright Classification, and Correction to Source Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/01 01:24:15 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34306",
"subject": "LIGO/Virgo/KAGRA S230731an: Updated Sky Localization and EM Bright Classification, and Correction to Source Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230731an (GCN Circular 34303). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230731an\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230731an is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 599 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1001 +/- 242 Mpc (a posteriori mean +/- standard deviation).\n\nThe GCN Circular 34303 quoted incorrect values for the classification of the GW signal. These differ from the correct values found in the Initial Notice. The correct values from the Initial Notice are: BBH (81%), NSBH (18%), Terrestrial (<1%), or BNS (0%).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODUzMDYxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.TRKmOp2xrLMY5fMhIoYawFinihrPDRZv53AeCr-CzJ8\n\n",
"published": "2023-08-01T01:24:26.525932Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T01:24:26.525950Z",
"modified": "2023-08-01T01:24:26.534031Z",
"nonlocalizedevents": [
{
"event_id": "S230731a"
}
],
"targets": []
},
{
"id": 1714,
"topic": "gcn.circular",
"uuid": "62e4cf00-06f1-424c-b795-19f4bf9324d3",
"title": "LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/08/01 02:03:51 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34307",
"subject": "LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM"
},
"message_text": "S. Dalessi (UAH) reports on behalf of the Fermi-GBM Team:\n\nAt the time of LVK S230731an, Fermi was passing through the South Atlantic Anomaly from 12.6 minutes prior to 5.7 minutes after the trigger time; therefore the GBM detectors were disabled.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODU1NDM2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.abx7FeUOsoK7vvFXdyPzzGmcHZZb54S1eXjjHVggXUU\n\n",
"published": "2023-08-01T02:04:02.153974Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T02:04:02.153994Z",
"modified": "2023-08-01T02:04:02.161932Z",
"nonlocalizedevents": [
{
"event_id": "S230731a"
}
],
"targets": []
},
{
"id": 1716,
"topic": "gcn.circular",
"uuid": "30f40547-7753-40a6-a225-0908ff2ad81a",
"title": "LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/01 06:45:02 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34308",
"subject": "LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), M. Dixit (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried out a search for X-ray candidates in Astrosat CZTI data in a 100-sec window around the trigger time of the event S230731an (UTC 2023-07-31 21:53:07, GraceDB event). We use the Bilby.multiorder.fits,0 map (https://gracedb.ligo.org/api/superevents/S230731an/files/Bilby.multiorder.fits,0) for our analysis. CZTI is a coded aperture mask instrument that has a considerable effective area for about 29% of the entire sky but is also sensitive to brighter transients from the entire sky. At the time of the merger, Astrosat's nominal pointing is RA, DEC = 00:47:41.1, 85:07:31.0 (11.9212,85.1253), which is ~60 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the maximum probability location is ~87 deg and hence is not occulted by Earth in the satellite's frame. In a time interval of 100 sec around the event, the region of the localization map which is not occulted by Earth in the satellite's frame has a total probability of 0.93 (93%) of containing the source.\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants to look for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 100-sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modeled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability-weighted mean over the visible sky:\n\n0.1 s: flux limit= 1.18e-05 ergs/cm^2/s; fluence limit = 1.18e-06 ergs/cm^2\n1.0 s: flux limit= 2.30e-06 ergs/cm^2/s; fluence limit = 2.30e-06 ergs/cm^2\n10.0 s: flux limit= 2.74e-07 ergs/cm^2/s; fluence limit = 2.74e-06 ergs/cm^2\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODcyMzA3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.rmCjILKDGQema86iob27KFLHM6FrO0wHbmKspla7L00\n\n",
"published": "2023-08-01T06:45:16.752211Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T06:45:16.752229Z",
"modified": "2023-08-01T06:45:16.758637Z",
"nonlocalizedevents": [
{
"event_id": "S230731a"
}
],
"targets": []
},
{
"id": 2516,
"topic": "gcn.circular",
"uuid": "1dcf78b3-6262-426c-b740-0684613841b0",
"title": "Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "leavittob@gmail.com",
"data": {
"date": "23/08/27 10:40:23 GMT",
"from": "leavittob@gmail.com",
"title": "GCN CIRCULAR",
"number": "34570",
"subject": "Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations"
},
"message_text": "E. Pavoni and L. Moretti (Leavitt Observatory, Italy), in a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Università degli Studi Di Salerno)\nreport: \n\nWe observed the field of Swift J1727.8-1613 (GRB 230824A: Page et al., GCN 34537; Navaneeth et al., GCN 34538, Odeh et al., GCN 34543; U.Quadri et al., GCN 34562; C. Lopresti, GCN 34566) with the telescope of Leavitt Observatory, Italy. Member of: \n\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nATA - Associazione Tuscolana di Astronomia.\n\nThe observations began at 20:02 UT on 2023/08/24 (~6 hours after the Swift trigger), with our RC telescope D=250 mm F/D=8.\n\nWeather conditions were good.\n\nWe took 25 images of 120 sec each. All images are Rc filtered, calibrated with master dark and master flat, stacked with ASTAP software and analyzed with AstroImageJ software.\n\nWe clearly detected a bright object, in the same location as M.Odeh et al., GCN 34543, within the uncertainty radius of the Swift localization, at:\n\nR.A. (J2000): 17:27:43.32\nDec. (J2000): -16:12:18.8\n\nThe results of our photometry in Rc band are:\n\nJD_UTC\t\t\t Source_Mag\tSource_Mag_Err\n2460181.3385997\t\t13,766\t\t 0,006\t\t\t\n2460181.3457458\t\t13,725\t\t 0,006\t\t\t\n2460181.3528939\t\t13,731\t\t 0,006\n2460181.3603810\t\t13,694\t\t 0,006\n2460181.3689481\t\t13,671\t\t 0,005\n\nMagnitudes were estimated with PanSTARRS cat. and are not corrected for galactic dust extinction.\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTMyODI4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nyP9cz52HWriqeW5A-mHwS1ypvwECbQSes29m7_wcWk\n\n",
"published": "2023-08-27T10:40:40.458049Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T10:40:40.458067Z",
"modified": "2023-08-27T10:40:40.461781Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2680,
"topic": "gcn.circular",
"uuid": "db35ec3d-c9ae-4eed-8a39-b2eb386d408e",
"title": "GRB 230903A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/09/03 17:33:32 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34608",
"subject": "GRB 230903A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 17:22:58 UT on 3 Sep 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230903A (trigger 715454583.81493 / 230903724).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 13.4, Dec = -13.5 (J2000 degrees, equivalent to J2000 00h 53m, -13d 30'), with a statistical uncertainty of 16.6 degrees.\n\nThe angle from the Fermi LAT boresight is 70.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230903724/quicklook/glg_skymap_all_bn230903724.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230903724/quicklook/glg_healpix_all_bn230903724.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230903724/quicklook/glg_lc_medres34_bn230903724.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNzYyNDE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.akkk2Vi9FBkPtlWR1Yk43zqSscx7riWDqRDG22MOzWw\n\n",
"published": "2023-09-03T17:33:47.077656Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-03T17:33:47.077672Z",
"modified": "2023-09-03T17:33:47.081253Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2681,
"topic": "gcn.circular",
"uuid": "39ce6f92-f1db-4e84-be8b-a2cb2f09a252",
"title": "Swift GRB230903.72: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/09/03 17:36:45 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34609",
"subject": "Swift GRB230903.72: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-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 GRB230903.72 (trigger No 1189514,00h 39m 42.24s , -40d 55m 26.4s, R=0.05) errorbox 65 sec after notice time and 100 sec after trigger time at 2023-09-03 17:24:36 UT, with upper limit up to 16.0 mag. Observations started at twilight. The observations began at zenith distance = 80 deg. The sun altitude is -13.8 deg.\n\nThe galactic latitude b = -76 deg., longitude l = 310 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"64930\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 110 | MASTER-SAAO | P/ | 20 | 14.9 |\n 268 | MASTER-SAAO | P/ | 50 | 16.0 |\n 335 | MASTER-SAAO | P/ | 60 | 15.8 |\n 426 | MASTER-SAAO | P/ | 60 | 15.9 |\n 506 | MASTER-SAAO | P/ | 60 | 16.0 |\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNzYyNjA5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.xX3c-cy-b1RECbIFq7ehrwyWas7cfVb0Ho2jjq35OT0\n\n",
"published": "2023-09-03T17:36:54.560583Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-03T17:36:54.560600Z",
"modified": "2023-09-03T17:36:54.564194Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1735,
"topic": "gcn.circular",
"uuid": "7c5ae23b-0216-463b-8aea-1733c0ee4c84",
"title": "GRB 230723A: SPT-3G millimeter-band transient event inconsistent with IPN position",
"submitter": "Hop gcn.circular",
"authors": "Sam Guns at S Pole Telescope & UC Berkeley <sguns@berkeley.edu>",
"data": {
"date": "23/08/01 20:16:17 GMT",
"from": "Sam Guns at S Pole Telescope & UC Berkeley <sguns@berkeley.edu>",
"title": "GCN CIRCULAR",
"number": "34309",
"subject": "GRB 230723A: SPT-3G millimeter-band transient event inconsistent with IPN position"
},
"message_text": "S. Guns (UC Berkeley) on behalf of the South Pole Telescope Collaboration:\n\nIn light of the updated error box provided by IPN, the millimeter-band transient event reported by the South Pole Telescope in GCN #34301 is no longer spatially consistent with GRB 230723A (Fermi GBM, GCN #34232; IPN, GCN #34258). The event remains an unexplained, short-duration millimeter-band transient not obviously associated with any known galactic source.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTIwOTgyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-tSbR9PbnLvkSauyxB4wBVsuhmLhlpom89FExihciB8\n\n",
"published": "2023-08-01T20:16:31.971018Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T20:16:31.971037Z",
"modified": "2023-08-01T20:16:31.977565Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1760,
"topic": "gcn.circular",
"uuid": "6723d6c2-ae5f-4126-843b-aafa5a3bb24f",
"title": "IceCube-230707A: JCMT/SCUBA-2 submm observations",
"submitter": "Hop gcn.circular",
"authors": "Kuiyun Huang at CYCU <kuiyun@gmail.com>",
"data": {
"date": "23/08/02 04:44:13 GMT",
"from": "Kuiyun Huang at CYCU <kuiyun@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34311",
"subject": "IceCube-230707A: JCMT/SCUBA-2 submm observations"
},
"message_text": "Y. Urata, K.Y. Huang on behalf of a larger collaboration\n\nWe observed the field of IceCube-230707A (GCN Circ. 34163) using\nSCUBA-2 attached to JCMT. The observations at 450 and 850 um were\nconducted on 2023/07/08, 2023/07/14, 2023/07/24, 2023/07/25, and\n2023/07/28. In the individual epochs, SCUBA-2 imaged the field\ncentered at RA 269.03, Dec -1.94 with 1.3 deg diameter. The rms of the\nstacked map in 850um is 6 mJy. There was no source brighter than the\n5-sigma limit.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTUxNDU5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ZLvbKNQGrzKnLyxajysfnrM2gRQM4zFqXMsQLgKLZWA\n\n",
"published": "2023-08-02T04:44:29.760640Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T04:44:29.760657Z",
"modified": "2023-08-02T04:44:29.766936Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1761,
"topic": "gcn.circular",
"uuid": "62fbaa44-e51b-4c48-a583-daa388e1a280",
"title": "IceCube-230724A: JCMT/SCUBA-2 submm observations",
"submitter": "Hop gcn.circular",
"authors": "Kuiyun Huang at CYCU <kuiyun@gmail.com>",
"data": {
"date": "23/08/02 04:44:38 GMT",
"from": "Kuiyun Huang at CYCU <kuiyun@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34312",
"subject": "IceCube-230724A: JCMT/SCUBA-2 submm observations"
},
"message_text": "Y. Urata, K.Y. Huang on behalf of a larger collaboration\n\nWe observed the field of IceCube-230724A (GCN Circ. 34265) using\nSCUBA-2 attached to JCMT. The observations at 450 and 850 um were\nconducted on 2023/07/28 and 2023/07/29. The individual observations\ncovered the 90% IceCube-230724A uncertainty localization region. The\nrms of the stacked map in 850um is 7.7 mJy. There was no source\nbrighter than the 5-sigma limit.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTUxNDc5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7JJ5KMpiC1Uc5--_qWQgRdpz5p-y2IbBYJjwu68yi30\n\n",
"published": "2023-08-02T04:44:42.787882Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T04:44:42.787898Z",
"modified": "2023-08-02T04:44:42.793561Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2517,
"topic": "gcn.circular",
"uuid": "a1938c0d-8539-49af-a4bf-d22fa1f2b4ec",
"title": "GRB 230826A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "rachel.hamburg@ijclab.in2p3.fr",
"data": {
"date": "23/08/27 11:36:56 GMT",
"from": "rachel.hamburg@ijclab.in2p3.fr",
"title": "GCN CIRCULAR",
"number": "34571",
"subject": "GRB 230826A: Fermi GBM Observation"
},
"message_text": "O.J. Roberts (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 19:32:44.53 UT on 26 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230826A (trigger 714771169/230826814),\nwhich was also detected by Swift-BAT (R.A.J. Eyles-Ferris et al. 2023, GCN 34565).\nThe Fermi GBM Final Real-time Localization (GCN 34564) is consistent with the Swift-BAT position.\n\nThe angle from the Fermi LAT boresight is 116 degrees.\n\nThe GBM light curve consists of a single FRED peak with a duration (T90)\nof about 37 s (50-300 keV). The time-averaged spectrum\nfrom T0-4.1 to T0+46.1 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.75 +/- 0.12 and the cutoff energy,\nparameterized as Epeak, is 87 +/- 5 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.012 +/- 0.246)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.9 s in the 10-1000 keV band is 4.9 +/- 0.4 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTM2MjIxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3RMKcad-0um2LsiZYSSyhU7f8CUd8dArOX42hN8foU8\n\n",
"published": "2023-08-27T11:37:10.321980Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T11:37:10.322003Z",
"modified": "2023-08-27T11:37:10.328244Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1770,
"topic": "gcn.circular",
"uuid": "256b744c-51f6-4ce3-aea9-177e0cbcb910",
"title": "GRB 230802A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/02 07:08:39 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34313",
"subject": "GRB 230802A: Swift detection of a burst"
},
"message_text": "\nN. J. Klingler (GSFC/UMBC/CRESSTII), V. D'Elia (SSDC & INAF-OAR),\nP. A. Evans (U Leicester), J. A. Kennea (PSU), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), A. Melandri (INAF-OAR),\nK. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 06:50:26 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230802A (trigger\u001182085). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 76.221, +19.570 which is\n RA(J2000) = 05h 04m 53s\n Dec(J2000) = +19d 34' 10\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a wide pulse\nstructure with a duration of about 60 sec. The peak count rate\nwas ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 06:51:30.3 UT, 64.1 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nfading, uncatalogued X-ray source located at RA, Dec 76.23952, 19.56147\nwhich is equivalent to:\n RA(J2000) = 05h 04m 57.48s\n Dec(J2000) = +19d 33' 41.3\"\nwith an uncertainty of 3.5 arcseconds (radius, 90% containment). This\nlocation is 69 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper. No\nspectrum from the promptly downlinked event data is yet available to\ndetermine the column density.\n\nThe initial flux in the 2.5 s image was 1.25e-09 erg cm^-2 s^-1 (0.2-10\nkeV).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 73 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.\nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.614.\n\nBurst Advocate for this burst is N. J. Klingler (noelklin AT umbc.edu).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTYwMTI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JHisq2ZR83De20gq5hNy5hb4yAMwRKQcf7yTd7P0fxs\n\n",
"published": "2023-08-02T07:08:50.502559Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T07:08:50.502577Z",
"modified": "2023-08-02T07:08:50.508929Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4054,
"topic": "gcn.circular",
"uuid": "b24ae6ac-2437-43f1-a094-66ea5deced67",
"title": "LIGO/Virgo/KAGRA S231020bw: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Amanda Baylor at University of Wisconsin-Milwaukee <amanda.baylor@ligo.org>",
"data": {
"date": "23/10/20 19:25:05 GMT",
"from": "Amanda Baylor at University of Wisconsin-Milwaukee <amanda.baylor@ligo.org>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34857"
},
"title": "GCN CIRCULAR",
"number": "34857",
"subject": "LIGO/Virgo/KAGRA S231020bw: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S231020bw during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-10-20 18:05:09.780 UTC (GPS time: 1381860327.780). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS231020bw is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.5e-10 Hz, or about one in 91 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231020bw\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nThe data is consistent with either a known class of instrumental artifacts in one detector or a GW signal that is located in the sky at the null point of the other detector. The skymap for this candidate is therefore the 2 null points of the second detector, where the detector is the least sensitive to gravitational waves.\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 26 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 888 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2868 +/- 924 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34857.",
"published": "2023-10-20T19:25:17.043987Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T19:25:17.044017Z",
"modified": "2023-10-20T19:25:17.052120Z",
"nonlocalizedevents": [
{
"event_id": "S231020b"
}
],
"targets": []
},
{
"id": 1787,
"topic": "gcn.circular",
"uuid": "1a5cb9a2-7160-4ad1-a17d-d409737eeafb",
"title": "LIGO/Virgo/KAGRA S230802aq: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "bolliand@fresnel.fr",
"data": {
"date": "23/08/02 12:53:54 GMT",
"from": "bolliand@fresnel.fr",
"title": "GCN CIRCULAR",
"number": "34314",
"subject": "LIGO/Virgo/KAGRA S230802aq: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230802aq during\nreal-time processing of data from LIGO Hanford Observatory (H1) at\n2023-08-02 11:33:59.961 UTC (GPS time: 1375011257.961). The candidate\nwas found by the GstLAL [1] analysis pipeline.\n\nS230802aq is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.2e-08 Hz, or about one in 1\nyear, 5 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230802aq\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (90%), NSBH (6%), Terrestrial (3%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is 57%. [2] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is 68%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 26 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n24221 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 444 +/- 156 Mpc (a posteriori mean +/-\nstandard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTgwODQwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9FDOO9wmEKNlWLadkxHIZdLDJ8F7QKR1UYVQc61cg50\n\n",
"published": "2023-08-02T12:54:05.494478Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T12:54:05.494496Z",
"modified": "2023-08-02T12:54:05.500820Z",
"nonlocalizedevents": [
{
"event_id": "S230802a"
}
],
"targets": []
},
{
"id": 4055,
"topic": "gcn.circular",
"uuid": "72412d9e-4845-4899-a570-bc39a5ea88d5",
"title": "Fermi GRB 231020A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/10/20 19:30:48 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34858"
},
"title": "GCN CIRCULAR",
"number": "34858",
"subject": "Fermi GRB 231020A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 231020A ( Fermi GBM team, GCN 34856) errorbox 510 sec after notice time and 519 sec after trigger time at 2023-10-20 19:05:37 UT, with upper limit up to 16.7 mag. The observations began at zenith distance = 80 deg. The sun altitude is -49.5 deg.\n\nThe galactic latitude b = -42 deg., longitude l = 18 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"89661\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 569 | 2023-10-20 19:05:37 | MASTER-Kislovodsk | (21h 11m 20.75s , -28d 16m 42.1s) | P| | 100 | 16.5 |\n 705 | 2023-10-20 19:07:37 | MASTER-Kislovodsk | (21h 11m 26.12s , -28d 17m 47.5s) | P| | 130 | 16.7 |\n 870 | 2023-10-20 19:10:08 | MASTER-Kislovodsk | (21h 11m 20.36s , -28d 18m 56.3s) | P| | 160 | 16.7 |\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34858.",
"published": "2023-10-20T19:30:58.328815Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T19:30:58.328836Z",
"modified": "2023-10-20T19:30:58.334993Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1789,
"topic": "gcn.circular",
"uuid": "6c1e0507-9347-4e52-8078-ad2ccd23c914",
"title": "LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/08/02 14:23:47 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34315",
"subject": "LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "T. Mihara, N. Kawai (RIKEN),\nH. Negoro, M. Nakajima (Nihon U.),\nS. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nY. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S230802aq at 2023-08-02 11:33:59 UTC (GCN #34314).\n\nAt the trigger time of S230802aq, the high-voltage of MAXI/GSC was on.\nThe instantaneous field of view of GSC at the GW trigger time covered 1% of the 90% credible region\nof the bayestar sky map, in which we found no significant new X-ray source.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 62%\nof the 90% credible region of the bayestar skymap from 11:33:59 to 13:05:58 UTC (T0+0 to T0+5519 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTg2MjMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.XZOYfhQYGYyRTgwLFVbO9YHylaCQwwO4XGT7umgFp6w\n\n",
"published": "2023-08-02T14:23:58.357418Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T14:23:58.357442Z",
"modified": "2023-08-02T14:23:58.364661Z",
"nonlocalizedevents": [
{
"event_id": "S230802a"
}
],
"targets": []
},
{
"id": 2522,
"topic": "gcn.circular",
"uuid": "98c13f97-1de3-4044-824f-9b4ab315a2a3",
"title": "GRB 230826A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/08/27 14:13:41 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34572",
"subject": "GRB 230826A: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 230826A (Fermi/GBM detection: GCN 34564; Swift/BAT detection: GCN 34565) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-08-26 19:32:45 UTC. The T90 duration measured by GRBAlpha is 18 s and the overall significance during T90 reaches 8.3 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230826A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTQ1NjI2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.NfI21hyyEtgIv_YGIkpzwxrCVi5lx46Cov1pybZ0rLM\n\n",
"published": "2023-08-27T14:13:55.783803Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T14:13:55.783824Z",
"modified": "2023-08-27T14:13:55.788526Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2525,
"topic": "gcn.circular",
"uuid": "e631bd8c-674d-4d44-9b81-4ba095b21849",
"title": "Swift J1727.8-1613 (GRB 230824A): Montarrenti Observatory photometric observations",
"submitter": "Hop gcn.circular",
"authors": "Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini@iol.it>",
"data": {
"date": "23/08/27 14:57:12 GMT",
"from": "Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini@iol.it>",
"title": "GCN CIRCULAR",
"number": "34573",
"subject": "Swift J1727.8-1613 (GRB 230824A): Montarrenti Observatory photometric observations"
},
"message_text": "S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy) report:\n\nWe observed the field of Swift J1727.8-1613 (GRB 230824A) \n(Page et al., GCN 34537; Odeh et al., GCN 34543; Dutton et al., GCN 34556; Odeh et al., GCN 34561; Quadri et al., GCN 34562; Lopresti, GCN 34566; Pavoni & Moretti, GCN 34570) with the remote controlled 0.53m Ritchey-Chretien telescope + U47 detector at Montarrenti Observatory (Siena, Italy, IAU code C88) in 2 epochs, starting on Aug 24.78994 (5 hours after trigger) and Aug. 26.79422 2023 (53 hours after trigger) with multiple exposures in V, Rc and Ic band.\n \nThe OT was detected at the following position:\n\nRA (J2000.0) 17h 27m 43.32s +/-0.2 \nDec. (J2000.0) -16° 12' 18.60\" +/-0.2\n\nPhotometry was obtained using nearby PanSTARRS stars as follows:\n\n==============================\nObs. midtime UT Filter Mag. Err.\n==============================\n\n2460181.2962325 V 13.45 0.002\n2460181.3049015 V 13.48 0.002\n2460181.3127082 V 13.50 0.002\n2460181.3205208 V 13.50 0.002\n2460181.3305952 V 13.47 0.002\n\n2460183.3018576 V 12.54 0.003\n2460183.3062470 V 12.52 0.003\n2460183.3143382 V 12.48 0.004 \n2460183.3208796 V 12.50 0.004\n-----------------------------------------------\n\n2460181.2973320 R 13.39 0.001 \n2460181.3053240 R 13.42 0.001\n2460181.3131307 R 13.42 0.001\n2460181.3213754 R 13.44 0.001\n2460181.3315657 R 13.39 0.001\n\n2460183.2976407 R 12.43 0.002\n2460183.3047650 R 12.43 0.002\n2460183.3089728 R 12.41 0.002 \n2460183.3200694 R 12.44 0.002\n-----------------------------------------------\n\n2460181.2940451 I 13.29 0.002\n2460181.3031443 I 13.28 0.002\n2460181.3109548 I 13.26 0.002\n2460181.3187615 I 13.22 0.002\n2460181.3265489 I 13.26 0.001\n2460181.3336487 I 13.26 0.001\n\n2460183.2980439 I 12.28 0.003\n2460183.3052912 I 12.26 0.003\n2460183.3164382 I 12.27 0.003\n2460183.3204745 I 12.26 0.003\n-----------------------------------------------\n\n\nMagnitudes were converted using Lupton 2005 equations and are not corrected for galactic dust extinction.\n\nFurther observations are planned. \n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTQ4MjM3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.e7xDPC-tl2C33OUZNFGR6XOxNJHe_fu1o4SX8_Ra-Hk\n\n",
"published": "2023-08-27T14:57:28.237667Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T14:57:28.237689Z",
"modified": "2023-08-27T14:57:28.242941Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1792,
"topic": "gcn.circular",
"uuid": "c42429f6-7eee-42e5-82bf-9a0d142c2d10",
"title": "GRB 230802A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/02 20:19:42 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34317",
"subject": "GRB 230802A: Enhanced Swift-XRT position"
},
"message_text": "M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1180 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 230802A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 76.23985, +19.56066 which is equivalent\nto:\n\nRA (J2000): 05h 04m 57.56s\nDec (J2000): +19d 33' 38.4\"\n\nwith an uncertainty of 2.0 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDA3NTg4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.gXSWWnu01gZIreRx9TApT4aDZ3geTSzq_cteRt3WFws\n\n",
"published": "2023-08-02T20:19:56.325177Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T20:19:56.325198Z",
"modified": "2023-08-02T20:19:56.333112Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1793,
"topic": "gcn.circular",
"uuid": "22333e6d-265f-4984-af09-81fe3762b1cf",
"title": "GRB 230802A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/02 20:28:29 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34318",
"subject": "GRB 230802A: Swift-XRT refined Analysis"
},
"message_text": "A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB), A. D'Ai\n(INAF-IASFPA), A. Melandri (INAF-OAR), J. D. Gropp (PSU), S. Dichiara\n(PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 7.9 ks of XRT data for GRB 230802A, from 52 s to 40.1\nks after the BAT trigger. The data comprise 386 s in Windowed Timing\n(WT) mode (the first 10 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode.\n\nThe light curve can be modelled with a series of power-law decays. The\ninitial decay index is alpha=0.4 (+/-0.4). At T+345 s the decay\nsteepens to an alpha of 2.5 (+0.4, -0.3) before breaking again at\nT+1364 s to a final decay with index alpha=1.26 (+0.16, -0.30).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.02 (+/-0.04). The\nbest-fitting absorption column is 6.5 (+/-0.5) x 10^21 cm^-2, in\nexcess of the Galactic value of 3.4 x 10^21 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 1.66 (+0.22, -0.21)\nand a best-fitting absorption column of 4.5 (+1.5, -1.1) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum is 4.9 x 10^-11 (6.5 x 10^-11) erg cm^-2\ncount^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 4.5 (+1.5, -1.1) x 10^21 cm^-2\nGalactic foreground: 3.4 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.66 (+0.22, -0.21)\n\nIf the light curve continues to decay with a power-law decay index of\n1.26, the count rate at T+24 hours will be 1.5 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.2 x\n10^-14 (9.7 x 10^-14) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01182085.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDA4MTE1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JgnXilXrfYt_OApmADEPYfx96FVn8wN2EacvJtp50pE\n\n",
"published": "2023-08-02T20:28:40.331275Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T20:28:40.331298Z",
"modified": "2023-08-02T20:28:40.338329Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1794,
"topic": "gcn.circular",
"uuid": "d78572a4-9dfb-4019-b14b-d9dd2b87b748",
"title": "LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations",
"submitter": "Hop gcn.circular",
"authors": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"data": {
"date": "23/08/02 20:57:42 GMT",
"from": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34319",
"subject": "LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations"
},
"message_text": "J. Wood (NASA/MSFC) and J. Mangan (CNRS/IJCLab) report on behalf of the Fermi-GBM Team:\n\nFor S230802aq (GCN 34314) and using the initial bayestar skymap, Fermi-GBM was observing 59.4% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S230802aq. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi, located at an RA35.9, Dec%.3 with a radius of 67.6 degrees. We therefore set upper limits on impulsive gamma-ray emission for the GW localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128 s: 1.2 2.1 4.6\n1.024 s: 0.3 0.6 1.3\n8.192 s: 0.1 0.1 0.2\n\nAssuming the a posteriori mean luminosity distance of 444 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^48 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 4.3 7.0 25.\n1.024s: 1.0 2.1 7.1\n8.192s: 0.3 0.4 1.3\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDA5ODY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.v5Psk3kSHLoJNpP1szsSpGOlqYZ1xaO_Pjv9Ho9XR3w\n\n",
"published": "2023-08-02T20:57:54.083247Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T20:57:54.083280Z",
"modified": "2023-08-02T20:57:54.091746Z",
"nonlocalizedevents": [
{
"event_id": "S230802a"
}
],
"targets": []
},
{
"id": 1795,
"topic": "gcn.circular",
"uuid": "2cb41977-a8c7-4d5a-b2ef-7b3a0c28e1e1",
"title": "GRB 230802A: BOOTES-5/JGT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/08/02 21:00:30 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34320",
"subject": "GRB 230802A: BOOTES-5/JGT optical upper limit"
},
"message_text": "E. Fernandez-Garcia, Y.-D. Hu, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar (UMA) and I. M. Carrasco-Garcia (SMA) and I. H. Park (SKKU), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 230802A by Swift (Klingler et al. GCNC 34313), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically observed the GRB location starting on Aug. 02, 11:41 UT (~ 4.9 h after trigger). No new optical source is detected on the co-added image (13 x 60 s, clear filter) within the enhanced Swift/XRT error region (Goad et al. GCNC 34317) down to 19.7 mag, which is consistent with the limit reported by UVOT (Klingler et al. GCNC 34313).\n\nWe thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDEwMDMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.XLVTGH_0ezlqTgKKQ77UkMazbB9ukLO9FwjKaHNIdaM\n\n",
"published": "2023-08-02T21:00:38.591605Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T21:00:38.591624Z",
"modified": "2023-08-02T21:00:38.597813Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1796,
"topic": "gcn.circular",
"uuid": "52407df9-6a95-4f05-8f1b-a14423ea2795",
"title": "Swift GRB 230802A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/03 01:19:09 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34321",
"subject": "Swift GRB 230802A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 230802A ( N. J. Klingler et al., GCN 34313) errorbox 65651 sec after notice time and 65669 sec after trigger time at 2023-08-03 01:04:55 UT, with upper limit up to 15.3 mag. Observations started at twilight. The observations began at zenith distance = 65 deg. The sun altitude is -13.8 deg.\n\nThe galactic latitude b = -12 deg., longitude l = 183 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"48891\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 65759 | MASTER-Tavrida | C | 180 | 15.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDI1NTU1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ARajf0lxxXZazNdr52QSDp1TNaSsR6GKWTdEnrzE9QI\n\n",
"published": "2023-08-03T01:19:21.180548Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T01:19:21.180569Z",
"modified": "2023-08-03T01:19:21.189331Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1797,
"topic": "gcn.circular",
"uuid": "a5eafd44-e9e9-42df-9d09-f631c5735cbd",
"title": "GRB 230802B: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"data": {
"date": "23/08/03 01:25:55 GMT",
"from": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34322",
"subject": "GRB 230802B: Fermi GBM Final Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\n\"At 23:58:47.92 UT on 02 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230802B (trigger 712713532/230802999).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 22.22, Dec = 9.62 (J2000 degrees, equivalent to J2000 1h 28m, +9d 37'),\nwith a statistical uncertainty of 5.88 degrees.\n\nThe angle from the Fermi LAT boresight is 77 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230802999/quicklook/glg_skymap_all_bn230802999.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230802999/quicklook/glg_healpix_all_bn230802999.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230802999/quicklook/glg_lc_medres34_bn230802999.gif\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDI1OTYwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.dl-WN6PkobQFFhe_UdgoHL4ZQ_FK8P3nb4ZBOofIoM0\n\n",
"published": "2023-08-03T01:26:06.379387Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T01:26:06.379408Z",
"modified": "2023-08-03T01:26:06.387908Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1798,
"topic": "gcn.circular",
"uuid": "80fb4223-7a03-47c1-aae9-b608cfdf30fc",
"title": "Fermi trigger No 712651827: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/03 01:31:01 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34323",
"subject": "Fermi trigger No 712651827: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB230802.28 (trigger No 712651827,04h 34m 04.01s , +12d 28m 00.1s, R=9.1167) errorbox 65639 sec after notice time and 65673 sec after trigger time at 2023-08-03 01:04:55 UT, with upper limit up to 15.3 mag. Observations started at twilight. The observations began at zenith distance = 65 deg. The sun altitude is -13.8 deg.\n\nThe galactic latitude b = -22 deg., longitude l = 184 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"48906\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 65763 | 2023-08-03 01:04:55 | MASTER-Tavrida | (05h 01m 53.77s , +19d 43m 25.9s) | C | 180 | 15.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDI2MjY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.h14jGf-TL2vj7_w9h8eSdb8LuqbmpU7Mxu_Y5Td5BRk\n\n",
"published": "2023-08-03T01:31:09.285384Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T01:31:09.285403Z",
"modified": "2023-08-03T01:31:09.291852Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1799,
"topic": "gcn.circular",
"uuid": "a8bce3c4-3e50-46ea-8930-5b92daba5138",
"title": "Fermi trigger No 712713532: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/03 01:31:25 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34324",
"subject": "Fermi trigger No 712713532: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB230802.99 (trigger No 712713532,01h 28m 52.80s , +09d 37m 12.0s, R=5.88) errorbox 33 sec after notice time and 66 sec after trigger time at 2023-08-02 23:59:54 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 53 deg. The sun altitude is -21.4 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230802.99 errorbox 578 sec after notice time and 611 sec after trigger time at 2023-08-03 00:08:59 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 62 deg. The sun altitude is -66.3 deg.\n\nThe galactic latitude b = -52 deg., longitude l = 139 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"49252\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 72 | 2023-08-02 23:59:54 | MASTER-Tavrida | (01h 58m 42.33s , +07d 15m 33.4s) | C | 10 | 16.6 |\n 94 | 2023-08-03 00:00:11 | MASTER-Tavrida | (01h 58m 44.94s , +07d 17m 12.7s) | C | 20 | 17.3 |\n 121 | 2023-08-03 00:00:38 | MASTER-Tavrida | (01h 58m 38.43s , +07d 16m 24.2s) | C | 20 | 17.3 |\n 152 | 2023-08-03 00:01:05 | MASTER-Tavrida | (01h 58m 38.24s , +07d 17m 24.3s) | C | 30 | 17.6 |\n 195 | 2023-08-03 00:01:43 | MASTER-Tavrida | (01h 58m 45.90s , +07d 16m 24.2s) | C | 40 | 17.8 |\n 244 | 2023-08-03 00:02:31 | MASTER-Tavrida | (01h 58m 38.80s , +07d 15m 24.1s) | C | 40 | 17.8 |\n 296 | 2023-08-03 00:03:18 | MASTER-Tavrida | (01h 58m 45.15s , +07d 15m 44.3s) | C | 50 | 18.1 |\n 365 | 2023-08-03 00:04:18 | MASTER-Tavrida | (01h 58m 42.05s , +07d 17m 21.2s) | C | 70 | 18.2 |\n 646 | 2023-08-03 00:08:33 | MASTER-Tavrida | (01h 26m 04.48s , +09d 43m 04.3s) | C | 120 | 18.0 |\n 641 | 2023-08-03 00:08:59 | MASTER-SAAO | (01h 27m 20.59s , +09d 19m 53.1s) | C | 60 | 17.1 |\n 701 | 2023-08-03 00:08:59 | MASTER-SAAO | (01h 27m 20.58s , +09d 19m 53.1s) | C | 180 | 18.0 | Coadd\n 641 | 2023-08-03 00:08:59 | MASTER-SAAO | (01h 26m 30.45s , +09d 21m 11.6s) | C | 60 | 16.7 |\n 701 | 2023-08-03 00:08:59 | MASTER-SAAO | (01h 26m 30.45s , +09d 21m 11.6s) | C | 180 | 17.5 | Coadd\n 732 | 2023-08-03 00:10:30 | MASTER-SAAO | (01h 27m 21.60s , +09d 20m 54.5s) | C | 60 | 17.4 |\n 732 | 2023-08-03 00:10:30 | MASTER-SAAO | (01h 26m 31.51s , +09d 22m 12.0s) | C | 60 | 17.4 |\n 784 | 2023-08-03 00:10:42 | MASTER-Tavrida | (01h 25m 57.88s , +09d 42m 17.1s) | C | 140 | 18.3 |\n 812 | 2023-08-03 00:11:49 | MASTER-SAAO | (01h 27m 27.50s , +09d 19m 55.4s) | C | 60 | 17.2 |\n 812 | 2023-08-03 00:11:49 | MASTER-SAAO | (01h 26m 37.38s , +09d 21m 12.9s) | C | 60 | 16.8 |\n 946 | 2023-08-03 00:13:09 | MASTER-Tavrida | (01h 25m 57.57s , +09d 43m 16.5s) | C | 170 | 18.5 |\n 903 | 2023-08-03 00:13:20 | MASTER-SAAO | (01h 26m 31.56s , +09d 20m 12.9s) | C | 60 | 16.7 |\n 903 | 2023-08-03 00:13:20 | MASTER-SAAO | (01h 27m 21.67s , +09d 18m 55.8s) | C | 60 | 17.0 |\n 1131 | 2023-08-03 00:16:09 | MASTER-Tavrida | (01h 26m 04.51s , +09d 42m 15.8s) | C | 180 | 18.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDI2Mjg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ce2aSDzrxrDEe9cfyMF5xVnNLVlkrtgqPMwM7HelVjI\n\n",
"published": "2023-08-03T01:31:31.333423Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T01:31:31.333443Z",
"modified": "2023-08-03T01:31:31.339533Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2682,
"topic": "gcn.circular",
"uuid": "9a5dacd3-f5e4-4561-a112-68ebb2786272",
"title": "GRB 230903A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/09/03 17:46:24 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34610",
"subject": "GRB 230903A: Swift detection of a burst"
},
"message_text": "\nA. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), J.D. Gropp (PSU),\nJ. A. Kennea (PSU), A. Y. Lien (U Tampa), A. Melandri (INAF-OAR),\nM. J. Moss (GWU), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 17:22:56 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230903A (trigger\u001189514). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 9.926, -40.924 which is\n RA(J2000) = 00h 39m 42s\n Dec(J2000) = -40d 55' 25\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of about 10 sec. The peak count rate\nwas ~1500 counts/sec (15-350 keV), at ~1 sec after the trigger.\n\nThe XRT began observing the field at 17:24:47.9 UT, 111.7 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source with an enhanced position: RA, Dec 9.91169,\n-40.94930 which is equivalent to:\n RA(J2000) = 00h 39m 38.81s\n Dec(J2000) = -40d 56' 57.5\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nlocation is 99 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (2.68 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 2.6\n(+2.17/-1.93) x 10^21 cm^-2 (90% confidence).\n\nUVOT took a finding chart exposure of 250 seconds with the U filter starting\n117 seconds after the BAT trigger. No credible afterglow candidate has been\nfound in the initial data products. The 2.7'x2.7' sub-image covers 100% of the\nXRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The\n8'x8' region for the list of sources generated on-board covers 100% of the XRT\nerror circle. The list of sources is typically complete to about 18.0 mag.\n\nBurst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.it).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNzYzMTkwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Q_85KiJPj-kIqBeb569q0-SKmtwv8cEKaPhNueVojaU\n\n",
"published": "2023-09-03T17:46:36.061630Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-03T17:46:36.061646Z",
"modified": "2023-09-03T17:46:36.066137Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1800,
"topic": "gcn.circular",
"uuid": "d25974e0-b7aa-4f6d-8b63-3bcbc67e79c7",
"title": "GRB 230803A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/03 01:37:47 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34325",
"subject": "GRB 230803A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 01:27:08 UT on 3 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230803A (trigger 712718833.154354 / 230803061).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 158.4, Dec = -64.4 (J2000 degrees, equivalent to J2000 10h 33m, -64d 24'), with a statistical uncertainty of 3.3 degrees.\n\nThe angle from the Fermi LAT boresight is 66.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230803061/quicklook/glg_skymap_all_bn230803061.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230803061/quicklook/glg_healpix_all_bn230803061.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230803061/quicklook/glg_lc_medres34_bn230803061.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDI2NjcxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.R0yTVkIjMk0-yBFZr0yq-DlGB7Nff_rWFUwXrR61AJQ\n\n",
"published": "2023-08-03T01:37:57.327130Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T01:37:57.327162Z",
"modified": "2023-08-03T01:37:57.333740Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1801,
"topic": "gcn.circular",
"uuid": "45d4526d-be4d-4339-b76f-37ff09487294",
"title": "Fermi trigger No 712718833: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/03 02:15:33 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34326",
"subject": "Fermi trigger No 712718833: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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 GRB230803.06 (trigger No 712718833,10h 33m 38.40s , -64d 22m 48.0s, R=3.33) errorbox 566 sec after notice time and 602 sec after trigger time at 2023-08-03 01:37:10 UT, with upper limit up to 15.2 mag. The observations began at zenith distance = 83 deg. The sun altitude is -48.7 deg.\n\nThe galactic latitude b = -6 deg., longitude l = 289 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"49288\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 632 | 2023-08-03 01:37:10 | MASTER-SAAO | (10h 31m 29.69s , -64d 13m 16.9s) | C | 60 | 14.0 |\n 692 | 2023-08-03 01:37:10 | MASTER-SAAO | (10h 31m 29.69s , -64d 13m 16.9s) | C | 180 | 14.0 | Coadd\n 632 | 2023-08-03 01:37:10 | MASTER-SAAO | (10h 33m 24.96s , -64d 14m 58.3s) | C | 60 | 14.9 |\n 692 | 2023-08-03 01:37:10 | MASTER-SAAO | (10h 33m 24.97s , -64d 14m 57.9s) | C | 180 | 15.2 | Coadd\n 723 | 2023-08-03 01:38:41 | MASTER-SAAO | (10h 31m 23.52s , -64d 13m 50.9s) | C | 60 | 13.4 |\n 723 | 2023-08-03 01:38:41 | MASTER-SAAO | (10h 33m 18.65s , -64d 15m 33.1s) | C | 60 | 14.6 |\n 803 | 2023-08-03 01:40:00 | MASTER-SAAO | (10h 31m 24.53s , -64d 12m 54.1s) | C | 60 | 13.6 |\n 803 | 2023-08-03 01:40:00 | MASTER-SAAO | (10h 33m 19.47s , -64d 14m 36.0s) | C | 60 | 14.8 |\n 894 | 2023-08-03 01:41:32 | MASTER-SAAO | (10h 31m 30.04s , -64d 13m 54.6s) | C | 60 | 13.6 |\n 894 | 2023-08-03 01:41:32 | MASTER-SAAO | (10h 33m 24.97s , -64d 15m 37.3s) | C | 60 | 14.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDI4OTM5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.cnZSkAI_oQjabgNi8AGUH3PbT-29oHyLv70AScUT9Rk\n\n",
"published": "2023-08-03T02:15:45.259083Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T02:15:45.259102Z",
"modified": "2023-08-03T02:15:45.267740Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1804,
"topic": "gcn.circular",
"uuid": "bfbbddfa-a011-4c25-944e-a72277537b2a",
"title": "LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/03 05:28:49 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34327",
"subject": "LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), M. Dixit (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried out a search for X-ray candidates in Astrosat CZTI data in a 100-sec window around the trigger time of the event S230802aq (UTC 2023-08-02 11:33:59, GraceDB event). We use the bayestar.multiorder.fits,0 map (https://gracedb.ligo.org/api/superevents/S230802aq/files/bayestar.multiorder.fits,0) for our analysis. CZTI is a coded aperture mask instrument that has a considerable effective area for about 29% of the entire sky but is also sensitive to brighter transients from the entire sky. At the time of the merger, Astrosat's nominal pointing is RA, DEC = 17:22:28.7, -41:35:57.7 (260.6196,-41.5994), which is ~128 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the maximum probability location is ~53 deg and is occulted by Earth in the satellite's frame. In a time interval of 100 sec around the event, the region of the localization map not occulted by Earth in the satellite's frame has a total probability of 0.70 (70%) of containing the source.\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 100-sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modeled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability-weighted mean over the visible sky:\n\n0.1 s: flux limit= 1.68e-05 ergs/cm^2/s; fluence limit = 1.68e-06 ergs/cm^2\n1.0 s: flux limit= 3.31e-06 ergs/cm^2/s; fluence limit = 3.31e-06 ergs/cm^2\n10.0 s: flux limit= 3.84e-07 ergs/cm^2/s; fluence limit = 3.84e-06 ergs/cm^2\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDQwNTM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.bnwPZIL8feYU5oKRnwHANgHv-4uJfNRSfU96HnCUWdk\n\n",
"published": "2023-08-03T05:29:02.894406Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T05:29:02.894435Z",
"modified": "2023-08-03T05:29:02.902696Z",
"nonlocalizedevents": [
{
"event_id": "S230802a"
}
],
"targets": []
},
{
"id": 1805,
"topic": "gcn.circular",
"uuid": "334f3363-bae0-4d6b-98e8-c466c887fd73",
"title": "GRB 230803A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/03 12:04:58 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34328",
"subject": "GRB 230803A: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the ML pipeline (Abraham et al., 2021, MNRAS, 504, 3084) and the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a bright long GRB 230803A which was also detected by Fermi (Fermi GBM Team, GCN Circ. 34325).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-03 01:28:42.50 UTC. The measured peak count rate associated with the burst is 783 (+56, -59) counts/s above the background in the combined data of all quadrants, with a total of 5492 (+498, -481) counts. The local mean background count rate was 430 (+3, -3) counts/s. Using cumulative rates, we measure a T90 of 25 (+2, -1) s. In the preliminary analysis, we find 371 Compton events associated with this event.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-03 01:28:42.63 UTC. The measured peak count rate associated with the burst is 2196 (+97, -102) counts/s above the background in the combined data of all quadrants, with a total of 15329 (+934, -934) counts. The local mean background count rate was 1365 (+7, -5) counts/s. We measure a T90 of 26 (+2, -1) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDY0MzA0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.PYmvd6jAxfjOhMMko9o_qLrbGpTb_Etyrr1FUQINFlk\n\n",
"published": "2023-08-03T12:05:11.654356Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T12:05:11.654374Z",
"modified": "2023-08-03T12:05:11.662914Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1806,
"topic": "gcn.circular",
"uuid": "d11b1ca6-c8aa-4963-b463-a6918c1a7e36",
"title": "GRB 230802A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Sam LaPorte at PSU <sjl5346@psu.edu>",
"data": {
"date": "23/08/03 13:59:26 GMT",
"from": "Sam LaPorte at PSU <sjl5346@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34329",
"subject": "GRB 230802A: Swift/UVOT Upper Limits"
},
"message_text": "GRB 230802A: Swift/UVOT Upper Limits\n\nS. J. LaPorte (PSU) and N. J. Klingler (GSFC/UMBC/CRESSTII)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230802A\n73 s after the BAT trigger (Klingler et al., GCN Circ. 34313).\nNo optical afterglow consistent with the XRT position\n(Evans et al., GCN Circ. 34317)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 73 223 147 >20.0\nu_FC 286 535 246 >19.5\nwhite 73 1186 353 >20.5\nv 615 1581 117 >18.4\nb 541 1506 97 >19.2\nu 286 5048 492 >19.7\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.614 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDcxMTcyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ARDqS7C6Ndgg0CUhp-kY7ob5n7BaWv5jX5WBOa0RJfw\n\n",
"published": "2023-08-03T13:59:38.411152Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T13:59:38.411170Z",
"modified": "2023-08-03T13:59:38.418180Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1807,
"topic": "gcn.circular",
"uuid": "f33e6f0a-e9ce-4d4f-ac0e-086a9e7340d6",
"title": "IPN triangulation of GRB 230803A",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "23/08/03 20:39:17 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "34330",
"subject": "IPN triangulation of GRB 230803A"
},
"message_text": "A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin\non behalf of the HEND/Mars Odyssey team,\n\nA. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nand\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,\nand A.S. Gardner on on behalf of the GRS-Odyssey GRB team,\nreport:\n\nThe long-duration GRB 230803A\n(Fermi GBM detection: Fermi GBM team, GCN 34325;\nAstroSat CZTI detection: Navaneeth et al., GCN 34328)\nhas been detected by Fermi (GBM), Konus-Wind,\nINTEGRAL (SPI-ACS), AstroSat (CZTI), and\nMars-Odyssey (HEND), so far, at about 5228 s UT (01:27:08).\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n RA(2000), deg Dec(2000), deg\n ---------------------------------------------\n Center:\n 150.510 (10h 02m 02s) -64.987 (-64d 59' 12\")\n Corners:\n 147.455 (09h 49m 49s) -64.554 (-64d 33' 15\")\n 147.329 (09h 49m 19s) -64.581 (-64d 34' 51\")\n 153.688 (10h 14m 45s) -65.347 (-65d 20' 50\")\n 153.812 (10h 15m 15s) -65.315 (-65d 18' 54\")\n ---------------------------------------------\nThe error box area is 431 sq. arcmin, and its maximum\ndimension is 2.8 deg (the minimum one is 3 arcmin).\nThe Sun distance was 83 deg.\n\nThe IPN localization is consistent with, but reduces\nthe area of, the Fermi-GBM final localization (GCN 34325).\n\nThis localization may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230803_T05229/IPN/\n\nThe Konus-Wind time history and spectrum will be given\nin a forthcoming GCN Circular.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDk1MTYzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Tt3zgFo5NU-G0SaUyQXJtmrj8nGlm2EIesVCldYcrAE\n\n",
"published": "2023-08-03T20:39:33.510937Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T20:39:33.510956Z",
"modified": "2023-08-03T20:39:33.519091Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2532,
"topic": "gcn.circular",
"uuid": "45c4849c-aa93-4339-acc7-4866dfbd474f",
"title": "AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256",
"submitter": "Hop gcn.circular",
"authors": "jlv93@cornell.edu",
"data": {
"date": "23/08/27 17:43:38 GMT",
"from": "jlv93@cornell.edu",
"title": "GCN CIRCULAR",
"number": "34574",
"subject": "AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256"
},
"message_text": "Maggie L. Li, Jada L. Vail, Anna Y. Q. Ho (Cornell University), Michael Coughlin (University of Minnesota), Daniel Perley (LJMU), Anirudh Salgundi, Vishwajeet Swain, Gaurav Waratkar (IITB)\n\nWe report the discovery of a fast-evolving red transient by the Zwicky Transient Facility (ZTF). The transient is coincident with Fermi GRB 230827256 (trigger 714809315).\n\nAT 2023qxj (ZTF23abaanxz) was discovered at the position (J2000) of:\n\n RA = 19:58:33.55 (299.6397739 deg)\n Dec = +54:27:48.02 (54.4633396 deg)\n\non 2023-08-27 07:10:10.94 UT by ZTF at r = 17.11 +/- 0.04 mag (MJD`183.26872). ZTF obtained a non-detection 1 day prior (MJD`182.26553) at r > 20.18 mag, indicating a fast rise rate of >3 mag/day in r. ZTF also obtained detections later that night at r = 18.88 +/- 0.08 mag (MJD`183.33919) and g = 19.27 +/- 0.16 mag (MJD`183.40719), implying that the transient was red and fading quickly.\n\nThe Galactic latitude of AT 2023qxj is 12.8 degrees, and the Galactic reddening toward the direction of AT 2023qxj is: E_(g-r) = 0.227 from Schlafly & Finkbeiner (2011).\n\nThe fast rise, fast decay, red color, and lack of archival optical counterpart of AT 2023qxj make it a strong candidate afterglow. We identify the coincident GRB 230827256 discovered by Fermi at the position (J2000) of:\n\n RA = 19:57:16.8\n Dec = +56:28:12\n\nwith an error radius of 2.17 deg. The time of the GRB trigger was 2023-08-27 06:08:31 UT (MJD`183.25591), 18.45 minutes prior to the first ZTF detection of AT 2023qxj.\n\nZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTU4MjIzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JPvlliRTB3yECJzJDqGETkc_aAxye22d67kK6LumQcc\n\n",
"published": "2023-08-27T17:43:53.769934Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T17:43:53.769964Z",
"modified": "2023-08-27T17:43:53.781363Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1811,
"topic": "gcn.circular",
"uuid": "642f45ac-ff30-4b01-881c-cd8116616821",
"title": "GRB 230804A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/04 06:49:23 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34332",
"subject": "GRB 230804A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 06:38:55 UT on 4 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230804A (trigger 712823940.838898 / 230804277).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 199.8, Dec = -45.2 (J2000 degrees, equivalent to J2000 13h 19m, -45d 12'), with a statistical uncertainty of 16.6 degrees.\n\nThe angle from the Fermi LAT boresight is 71.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230804277/quicklook/glg_skymap_all_bn230804277.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230804277/quicklook/glg_healpix_all_bn230804277.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230804277/quicklook/glg_lc_medres34_bn230804277.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTMxNzY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.AD-M4jKmvrVcJTHYY5CgG-Fv_7KpwgEtNVkOmisMpLs\n\n",
"published": "2023-08-04T06:49:38.930223Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T06:49:38.930250Z",
"modified": "2023-08-04T06:49:38.937551Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1818,
"topic": "gcn.circular",
"uuid": "123bbee6-0dd0-447a-bfff-2cb9e7bac934",
"title": "GRB 230802A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Sibasish Laha at NASA-GSFC <slaha@umbc.edu>",
"data": {
"date": "23/08/04 14:09:21 GMT",
"from": "Sibasish Laha at NASA-GSFC <slaha@umbc.edu>",
"title": "GCN CIRCULAR",
"number": "34333",
"subject": "GRB 230802A: Swift-BAT refined analysis"
},
"message_text": "S. D. Barthelmy (GSFC), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC),D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC),T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 230802A (trigger #1182085)\n(Klingler et al., GCN Circ. 34313). The BAT ground-calculated position is\nRA, Dec = 76.232, 19.552 deg which is\n RA(J2000) = 05h 04m 55.6s\n Dec(J2000) = +19d 33' 06.3\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 99%.\n\nThe BAT light curve shows a complex structure with a duration of ~ 200 sec.\nT90 (15-350 keV) is 175.62 +- 18.26 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-6.04 to T+230.70 sec is best fit by a\nsimple\npower-law model. The power law index of the time-averaged spectrum is\n1.60 +- 0.07. The fluence in the 15-150 keV band is 5.0 +- 0.2 x 10^-06\nerg/cm2.\nThe 1-sec peak photon flux measured from T+0.60 sec in the 15-150 keV band\nis 2.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1182085/BA/\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTU4MTY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7ZhQHCfC15Mz5Kpapo20geJz1w4uf9MRXjsp4DZu4aU\n\n",
"published": "2023-08-04T14:09:33.858247Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T14:09:33.858275Z",
"modified": "2023-08-04T14:09:33.864888Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1819,
"topic": "gcn.circular",
"uuid": "15d396eb-de6c-4c8d-ae33-f32ff348218e",
"title": "GRB 230802A: Fermi GBM observation",
"submitter": "Hop gcn.circular",
"authors": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
"data": {
"date": "23/08/04 15:39:21 GMT",
"from": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
"title": "GCN CIRCULAR",
"number": "34334",
"subject": "GRB 230802A: Fermi GBM observation"
},
"message_text": "C. de Barra (UCD), J.Mangan (CNRS/IJCLab) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 06:50:22.23 UT on 2 August 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230802A (trigger 712651827 / 230802285),\nwhich was also detected by Swift BAT (N. J. Klingler et al. 2023, GCN 34313).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 107 degrees.\n\nThe GBM light curve consists of a single peak\nwith a duration (T90) of about 38 s (50-300 keV)The time-averaged spectrum from -14.3s to 26.6 s is\nbest fit by a simple power law function with index -1.7 +/- 0.02.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.3 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.4 s in the 10-1000 keV band\nis 5.6 +/- 0.4 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTYzNTY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.pJ0Dhohf47Wq0jutGoj9FPkBeZ55HL3Ob7LeePrs6W4\n\n",
"published": "2023-08-04T15:39:35.869277Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T15:39:35.869293Z",
"modified": "2023-08-04T15:39:35.874492Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1820,
"topic": "gcn.circular",
"uuid": "297d2e61-230a-4500-9738-d890990ebbaf",
"title": "GRB 230802B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/04 17:23:10 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34335",
"subject": "GRB 230802B: AstroSat CZTI detection"
},
"message_text": "B. Pari (IITB), P K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of GRB 230802B which was also detected by Fermi (Fermi GBM Team, GCN Circ. 34322).\n\nThe source was faintly detected in the 20-200 keV energy range in two quadrants. The light curve peaks at 2023-08-02 23:58:47.95 UTC. The measured peak count rate associated with the burst is 145.4 (+108.1, -8.4) counts/s above the background in the combined data of two quadrants, with a total of 169 (+54, -65) counts. The local mean background count rate was 151.0 (+5.2, -5.8) counts/s. Using cumulative rates, we measure a T90 of 2.7 (+0.8, -1.1) s.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTY5Nzk2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J0Py5WUXYAWDg03duB_rxcrvx0ntWem1GmqjXcLs24o\n\n",
"published": "2023-08-04T17:23:24.586716Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T17:23:24.586747Z",
"modified": "2023-08-04T17:23:24.593285Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2535,
"topic": "gcn.circular",
"uuid": "30300c93-a8c4-484e-bc61-bb676e7fb1ba",
"title": "GRB 230827A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/27 18:28:19 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34575",
"subject": "GRB 230827A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 18:17:52 UT on 27 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230827A (trigger 714853077.93055 / 230827762).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 319.1, Dec = -23.9 (J2000 degrees, equivalent to J2000 21h 16m, -23d 53'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 95.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230827762/quicklook/glg_skymap_all_bn230827762.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230827762/quicklook/glg_healpix_all_bn230827762.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230827762/quicklook/glg_lc_medres34_bn230827762.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTYwOTA0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.EUcjGv4wkEy9VRxW0olnh8geKAs7UzWT-vt08UNq9Zo\n\n",
"published": "2023-08-27T18:28:33.102972Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T18:28:33.102991Z",
"modified": "2023-08-27T18:28:33.107051Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1824,
"topic": "gcn.circular",
"uuid": "1650c327-3610-450d-bc13-c77fe1a533c6",
"title": "LIGO/Virgo/KAGRA S230802aq: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/04 23:08:50 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34336",
"subject": "LIGO/Virgo/KAGRA S230802aq: Updated Sky localization and EM Bright Classification"
},
"message_text": "We have conducted further analysis of the LIGO Hanford Observatory (H1) data around the time of the compact binary merger (CBC) candidate S230802aq (GCN Circular 34314). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230802aq\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230802aq is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is 9%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is 62%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 25885 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 576 +/- 246 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTkwNTM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J8rjZ0IqhMNfXi24UW-FLzLfpvm7KayhQ5lf8klfNvw\n\n",
"published": "2023-08-04T23:09:00.394802Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T23:09:00.394821Z",
"modified": "2023-08-04T23:09:00.398302Z",
"nonlocalizedevents": [
{
"event_id": "S230802a"
}
],
"targets": []
},
{
"id": 6968,
"topic": "gcn.circular",
"uuid": "a61b863d-35da-4d54-82bc-9781d0fd216a",
"title": "LIGO/Virgo/KAGRA S240422ed: EP-FXT detection of a candidate counterpart EP240426a",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/26 11:13:02 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36313"
},
"title": "GCN CIRCULAR",
"number": "36313",
"subject": "LIGO/Virgo/KAGRA S240422ed: EP-FXT detection of a candidate counterpart EP240426a"
},
"message_text": "H. Sun, D. Y. Li (NAOC, CAS), Y. Chen, J. Guan, C. K. Li, S. M. Jia, H. S. Zhao, J. Zhang, M. Y. Ge, W. W. Cui, H. Feng, W. Li, C. Z. Liu, F. J. Lu, L. M. Song, J. Wang, J. J. Xu, D. W. Han, S. N. Zhang, X. F. Zhao (IHEP, CAS), C. C. Jin, J. W. Hu, M. Zhang, H. Q. Cheng, H. Y. Liu, Y. Liu, Z. X. Ling, C. Zhang, M. H. Huang, H. W. Pan, Y. F. Xu, W. Yuan, W. D. Zhang (NAOC, CAS), Y. C. Fu (BNU), B. Zhang (UNLV), V. Burwitz, P. Friedrich, N. Meidinger, K. Nandra, A. Rau (MPE), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), B. Cordier (CEA), on behalf of the Einstein Probe team \n\nWe report on the detection of a possible X-ray counterpart candidate of S240422ed (The LIGO-Virgo-KAGRA Collaboration, GCN 36236), designated EP240426a, by the Follow-up X-ray telescope (FXT) on board the Einstein Probe (EP) mission. This source was found in a series of snapshots of EP-FXT targeting galaxies within the probable location of S240422ed. The observation started at 2024-04-26T04:23:21 (UTC) with an exposure time of 534 seconds.\n\nThe source is located within the 90% credible region of the updated LVK sky localization (The LIGO-Virgo-KAGRA Collaboration, GCN 36240). The position is R.A. = 121.8567 deg, Dec. = -29.4609 (R.A. = 08:07:25.61, Dec. = -29:27:39.2) with an uncertainty of 10\" (90% C.L. statistical and systematic). This position is 5.5 arcsec away from the galaxy 2MASX J08072584-2927344 at a luminosity distance of 188 Mpc. The absorption-corrected flux in 0.5-10 keV is about 9.2 x 10 ^-13 erg/s/cm2 assuming a power-law spectrum with a photon index of 2.0 with Galactic absorption. \n\nNo previously known X-ray sources are found within the error circle around this position. A flux upper limit set by the eRASS1 survey is 1.2 x 10^-13 erg/s/cm2 (99.9% C.L.) in 0.2-5.0 keV .\n\nFor any questions concerning this source please contact by email the Transient Advocates of EP240426a, H. Sun (hsun@nao.cas.cn) and D. Y. Li (dyli@nao.cas.cn) from the EP science center. Please note that EP-FXT is currently undergoing in-flight calibration, and the derived source parameters may be subject to larger uncertainties than quoted here; so please use them with caution. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36313.",
"published": "2024-04-26T11:13:16.167809Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-26T11:13:16.167828Z",
"modified": "2024-04-26T11:13:16.176785Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 1839,
"topic": "gcn.circular",
"uuid": "23c4c320-b83d-4c94-a44f-360e755f8974",
"title": "LIGO/Virgo/KAGRA S230805x: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "ê³½ê·ì§ <kyujin.kwak.72@gmail.com>",
"data": {
"date": "23/08/05 04:40:29 GMT",
"from": "ê³½ê·ì§ <kyujin.kwak.72@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34337",
"subject": "LIGO/Virgo/KAGRA S230805x: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230805x during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-05 03:42:49.972 UTC (GPS\ntime: 1375242187.972). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230805x is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 9.2e-09 Hz, or about one in 3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230805x\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 26 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n2235 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3852 +/- 1193 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjEwNDM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JzvLMZI9kFBbL3OYVSycHAf2cTTkdDeahyL-HZA0rJg\n\n",
"published": "2023-08-05T04:40:43.808997Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T04:40:43.809016Z",
"modified": "2023-08-05T04:40:43.812639Z",
"nonlocalizedevents": [
{
"event_id": "S230805x"
}
],
"targets": []
},
{
"id": 1845,
"topic": "gcn.circular",
"uuid": "27d33ff5-0167-4257-8b27-f8f290bf45ae",
"title": "GRB 230805A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/05 07:26:53 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34338",
"subject": "GRB 230805A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 07:16:16 UT on 5 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230805A (trigger 712912581.49606 / 230805303).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 44.7, Dec = 47.6 (J2000 degrees, equivalent to J2000 02h 58m, 47d 36'), with a statistical uncertainty of 6.5 degrees.\n\nThe angle from the Fermi LAT boresight is 77.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230805303/quicklook/glg_skymap_all_bn230805303.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230805303/quicklook/glg_healpix_all_bn230805303.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230805303/quicklook/glg_lc_medres34_bn230805303.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjIwNDE4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ItDM2ULBAHO4JfJegjCvcNsv1m7dHyu-LbhttZp8spA\n\n",
"published": "2023-08-05T07:27:04.318602Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T07:27:04.318621Z",
"modified": "2023-08-05T07:27:04.323133Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1855,
"topic": "gcn.circular",
"uuid": "f92d6d33-ce4a-44a1-a3ff-cd9c34aafdd8",
"title": "GRB 230805B: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Jamie Kennea at Penn State U <jak51@psu.edu>",
"data": {
"date": "23/08/05 11:49:08 GMT",
"from": "Jamie Kennea at Penn State U <jak51@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34339",
"subject": "GRB 230805B: Swift detection of a burst"
},
"message_text": "\nS. B. Cenko (GSFC), A. D'Ai (INAF-IASFPA),\nV. D'Elia (SSDC & INAF-OAR), J.D. Gropp (PSU), J. A. Kennea (PSU),\nH. A. Krimm (NSF), N. P. M. Kuin (UCL-MSSL), S. Laha (GSFC/UMBC) and\nM. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 11:23:51 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230805B (trigger\u001183217). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 207.747, +31.185 which is\n RA(J2000) = 13h 50m 59s\n Dec(J2000) = +31d 11' 05\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of about 60 sec. The peak count rate\nwas ~1300 counts/sec (15-350 keV), at ~5 sec after the trigger.\n\nThe XRT began observing the field at 11:27:03.3 UT, 192.3 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source with an enhanced position: RA, Dec 207.74281,\n31.19102 which is equivalent to:\n RA(J2000) = 13h 50m 58.28s\n Dec(J2000) = +31d 11' 27.7\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nlocation is 25 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (1.41 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.6\n(+2.86/-2.45) x 10^21 cm^-2 (90% confidence).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 858 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.\nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.014.\n\nBurst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjM2MTU0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.xtpAbvBGrD5yIuP8wiu0xhwwWwGjsaY2GqXur_2e1dg\n\n",
"published": "2023-08-05T11:49:19.486246Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T11:49:19.486263Z",
"modified": "2023-08-05T11:49:19.492523Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1859,
"topic": "gcn.circular",
"uuid": "6284ab91-b75d-47d7-aad1-c5f6f636a9cd",
"title": "LIGO/Virgo/KAGRA S230805x: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"data": {
"date": "23/08/05 12:55:52 GMT",
"from": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34340",
"subject": "LIGO/Virgo/KAGRA S230805x: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230805x (GCN Circular 34337). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\nhttps://gracedb.ligo.org/superevents/S230805x\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2094 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3305 +/- 1113 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjQwMTU3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.RL0svDHKsPG6NvBpCCR4H9g8iUthRjN2DXSt3bgC6wU\n\n",
"published": "2023-08-05T12:56:02.332547Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T12:56:02.332564Z",
"modified": "2023-08-05T12:56:02.335945Z",
"nonlocalizedevents": [
{
"event_id": "S230805x"
}
],
"targets": []
},
{
"id": 1862,
"topic": "gcn.circular",
"uuid": "caa67e98-7687-499e-8141-0c3f11c22ef9",
"title": "Swift GRB 230805B: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/05 17:03:02 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34341",
"subject": "Swift GRB 230805B: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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 230805B ( S. B. Cenko et al., GCN 34339) errorbox 19680 sec after notice time and 19762 sec after trigger time at 2023-08-05 16:53:13 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -10.7 deg.\n\nThe galactic latitude b = 76 deg., longitude l = 52 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"50484\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 19853 | MASTER-SAAO | C | 180 | 16.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjU0OTg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.65vNIZNbf9L1_PmUyfTmBHRpB5NdGY6QQWLrIHPSeCI\n\n",
"published": "2023-08-05T17:03:18.182340Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T17:03:18.182392Z",
"modified": "2023-08-05T17:03:18.187704Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1863,
"topic": "gcn.circular",
"uuid": "69f41f29-b05a-46eb-9d40-70b0b4aeef64",
"title": "Fermi trigger No 712927418: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/05 18:00:37 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34342",
"subject": "Fermi trigger No 712927418: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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 GRB230805.47 (trigger No 712927418,13h 53m 57.60s , +32d 30m 00.0s, R=9.1) errorbox 19746 sec after notice time and 19780 sec after trigger time at 2023-08-05 16:53:13 UT, with upper limit up to 18.4 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -10.7 deg.\n\nThe galactic latitude b = 75 deg., longitude l = 57 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"50503\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 19870 | 2023-08-05 16:53:13 | MASTER-SAAO | (13h 50m 08.41s , +31d 15m 33.0s) | C | 180 | 16.6 |\n 19870 | 2023-08-05 16:53:13 | MASTER-SAAO | (13h 51m 07.23s , +31d 18m 27.8s) | C | 180 | 16.6 |\n 20082 | 2023-08-05 16:56:45 | MASTER-SAAO | (13h 50m 13.94s , +31d 14m 47.3s) | C | 180 | 17.1 |\n 20082 | 2023-08-05 16:56:45 | MASTER-SAAO | (13h 51m 12.86s , +31d 17m 41.0s) | C | 180 | 16.8 |\n 20262 | 2023-08-05 16:56:45 | MASTER-SAAO | (13h 51m 12.85s , +31d 17m 40.7s) | C | 540 | 17.6 | Coadd\n 20293 | 2023-08-05 17:00:16 | MASTER-SAAO | (13h 50m 08.93s , +31d 13m 56.4s) | C | 180 | 17.5 |\n 20473 | 2023-08-05 17:00:16 | MASTER-SAAO | (13h 50m 08.93s , +31d 13m 56.4s) | C | 540 | 18.4 | Coadd\n 20293 | 2023-08-05 17:00:16 | MASTER-SAAO | (13h 51m 07.93s , +31d 16m 48.8s) | C | 180 | 17.2 |\n 20492 | 2023-08-05 17:03:35 | MASTER-SAAO | (13h 50m 13.39s , +31d 14m 06.4s) | C | 180 | 17.5 |\n 20492 | 2023-08-05 17:03:35 | MASTER-SAAO | (13h 51m 12.37s , +31d 16m 57.5s) | C | 180 | 17.3 |\n 20704 | 2023-08-05 17:07:07 | MASTER-SAAO | (13h 50m 11.18s , +31d 15m 51.3s) | C | 180 | 18.0 |\n 20704 | 2023-08-05 17:07:07 | MASTER-SAAO | (13h 51m 10.30s , +31d 18m 41.3s) | C | 180 | 17.6 |\n 20884 | 2023-08-05 17:07:07 | MASTER-SAAO | (13h 51m 10.31s , +31d 18m 41.1s) | C | 540 | 18.3 | Coadd\n 20915 | 2023-08-05 17:10:38 | MASTER-SAAO | (13h 50m 11.16s , +31d 14m 43.3s) | C | 180 | 18.0 |\n 20915 | 2023-08-05 17:10:38 | MASTER-SAAO | (13h 51m 10.35s , +31d 17m 32.7s) | C | 180 | 17.7 |\n 21127 | 2023-08-05 17:14:10 | MASTER-SAAO | (13h 50m 14.73s , +31d 16m 03.7s) | C | 180 | 18.4 |\n 21127 | 2023-08-05 17:14:10 | MASTER-SAAO | (13h 51m 13.94s , +31d 18m 52.3s) | C | 180 | 18.0 |\n 22419 | 2023-08-05 17:35:42 | MASTER-SAAO | (13h 50m 14.66s , +31d 16m 54.5s) | C | 180 | 17.5 |\n 22419 | 2023-08-05 17:35:42 | MASTER-SAAO | (13h 51m 13.23s , +31d 19m 38.7s) | C | 180 | 17.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjU4NDQzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.vlTD-G08RxIG_cY-LEbOIPmsQKXmwa_YvAhYb51g6Tw\n\n",
"published": "2023-08-05T18:00:48.575385Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T18:00:48.575414Z",
"modified": "2023-08-05T18:00:48.580313Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1864,
"topic": "gcn.circular",
"uuid": "464079f5-6392-49da-9871-041ddcf45d36",
"title": "GRB 230805B: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/05 20:40:08 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34343",
"subject": "GRB 230805B: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin (SAO RAS) and V. P. Goranskij (SAI MSU) report\non behalf of a larger collaboration.\n\nWe observed the field of the GRB 230805B (Cenko et al., GCNC #34339)\nwith the 1-m telescope of SAO RAS Zeiss-1000 equipped with the\nMulti-Mode Photometer-Polarimeter (MMPP). We obtained 4 x 300 sec.\nexposures in Rc band on August 5, 17:50:15--18:11:48 UT.\n\nWithin the XRT error circle we marginally detected a single object\n(possible OT) with coordinates (Epoch = 2000.0):\nR.A. = 13:50:58.2, Dec. = +31:11:28.6 (+/- 0\".5)\nand brightness about R = 22.7 +/- 0.3 (t_mid - t0 = 6.61 hours).\n\nThis preliminary photometry is based on the nearby SDSS stars;\nmagnitudes are converted using Lupton (2005) equations.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjY4MDE0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.mvQxiJKhxKSKquGCdoxnPgQpDV2quz2CC0KJ9mG6biw\n\n",
"published": "2023-08-05T20:40:19.683877Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T20:40:19.683900Z",
"modified": "2023-08-05T20:40:19.691050Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1865,
"topic": "gcn.circular",
"uuid": "044ba0a3-7595-4381-b4b1-5c66bee1d503",
"title": "Fermi GRB 230805A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/05 20:45:51 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34344",
"subject": "Fermi GRB 230805A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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) started inspect of the Fermi GRB 230805A ( Fermi GBM team, GCN 34338) errorbox 23358 sec after notice time and 23391 sec after trigger time at 2023-08-05 13:46:07 UT, with upper limit up to 14.1 mag. Observations started at twilight. The observations began at zenith distance = 76 deg. The sun altitude is -8.4 deg.\n\nThe galactic latitude b = -9 deg., longitude l = 145 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"50244\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 23421 | 2023-08-05 13:46:07 | MASTER-Tunka | (02h 45m 41.38s , +46d 10m 48.2s) | C | 60 | 14.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjY4MzU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.aMGOxShudFxIqceYSGJwBqmHQsZ9zGtpLz67rZCwcOA\n\n",
"published": "2023-08-05T20:46:00.504881Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T20:46:00.504906Z",
"modified": "2023-08-05T20:46:00.509907Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1866,
"topic": "gcn.circular",
"uuid": "bf913694-bc76-4afa-8ba2-e47b39faaa5d",
"title": "GRB 230805B: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/05 21:19:54 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34345",
"subject": "GRB 230805B: Swift-XRT refined Analysis"
},
"message_text": "A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB),\nS. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P.\nOsborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans report\non behalf of the Swift-XRT team:\n\nWe have analysed 6.0 ks of XRT data for GRB 230805B, from 210 s to 25.0\nks after the BAT trigger. The data are entirely in Photon Counting\n(PC) mode. The best available XRT position (using the promptly\ndownlinked event data, the XRT-UVOT alignment and matching UVOT field\nsources to the USNO-B1 catalogue) is RA, Dec = 207.74271, 31.19102\nwhich is equivalent to:\n\nRA (J2000): 13 50 58.25\nDec(J2000): +31 11 27.7\n\nwith an uncertainty of 1.9 arcsec (radius, 90% confidence).\n\nThe light curve can be modelled with a series of power-law decays. The\ninitial decay index is alpha=3.7 (+0.9, -0.4). At T+650 s the decay\nflattens to an alpha of -0.22 (+0.72, -0.08) before breaking again at\nT+4027 s to a final decay with index alpha=1.7 (+0.6, -0.5).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.76 (+0.26, -0.24). The\nbest-fitting absorption column is 8.9 (+7.5, -6.2) x 10^20 cm^-2, in\nexcess of the Galactic value of 1.4 x 10^20 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 3.8 x 10^-11 (4.4 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 8.9 (+7.5, -6.2) x 10^20 cm^-2\nGalactic foreground: 1.4 x 10^20 cm^-2\nExcess significance: 2.0 sigma\nPhoton index:\t 1.76 (+0.26, -0.24)\n\nIf the light curve continues to decay with a power-law decay index of\n1.7, the count rate at T+24 hours will be 5.6 x 10^-4 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.1 x\n10^-14 (2.5 x 10^-14) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01183217.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjcwNDAwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Snypt_rO_nIs6Eat0qnjn99RxzKWyWp-Mony5GdVsbY\n\n",
"published": "2023-08-05T21:20:05.690910Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T21:20:05.690931Z",
"modified": "2023-08-05T21:20:05.695572Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1875,
"topic": "gcn.circular",
"uuid": "db6a6221-f387-42d1-8aca-6cd39ffb94c1",
"title": "Fermi trigger No 712987357: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/06 06:15:38 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34348",
"subject": "Fermi trigger No 712987357: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230806.17 (trigger No 712987357,04h 12m 28.80s , -07d 19m 48.0s, R\u0018.1) errorbox 7275 sec after notice time and 7313 sec after trigger time at 2023-08-06 06:04:26 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 72 deg. The sun altitude is -66.3 deg.\n\nThe galactic latitude b = -38 deg., longitude l = 200 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"50876\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 7404 | 2023-08-06 06:04:26 | MASTER-OAFA | (03h 12m 50.30s , -04d 36m 51.0s) | C | 180 | 16.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzAyNTQzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.bXLaLGFfRmlqswzJM0HX40T3D774_qn86ihnfDKVugo\n\n",
"published": "2023-08-06T06:15:52.048669Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T06:15:52.048686Z",
"modified": "2023-08-06T06:15:52.054909Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1869,
"topic": "gcn.circular",
"uuid": "73a73eab-8696-4bc8-aa1c-b19fbc4eb44f",
"title": "GRB 230805B: NOT optical afterglow confirmation",
"submitter": "Hop gcn.circular",
"authors": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"data": {
"date": "23/08/05 22:58:50 GMT",
"from": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"title": "GCN CIRCULAR",
"number": "34346",
"subject": "GRB 230805B: NOT optical afterglow confirmation"
},
"message_text": "D. B. Malesani (Radboud Univ. and DAWN/NBI) and T. Pursimo (NOT) report on behalf of a larger collaboration:\n\nWe observed the location of GRB 230805B (Cenko et al., GCN 34339) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were secured in the r and z bands. An object with position consistent with the one reported by Moskvitin & Goranskij (GCN 34343) is well detected in our data. Based on nearby stars from the Gaia catalog, we measure the following J2000 coordinates, with an error of ~0.3\":\n\nRA = 13:50:58.23\nDec = +31:11:28.6\n\nAt a mean epoch 2023 Aug 5.91 UT (10.4 hr after the trigger), we measure a preliminary magnitude (calibrated against nearby Pan-STARRS point-like sources) r = 23.5 +- 0.15 AB. Compared to the measurement by Moskvitin & Goranskij (GCN 34343), our magnitude value provides 2-sigma evidence for fading, consistent with afterglow behavior.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjc2MzM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9wBQOh8vVAH0B9WfmrkrFbSm-3gjLoBGoqZmrGYpoC4\n\n",
"published": "2023-08-05T22:59:01.557646Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T22:59:01.557663Z",
"modified": "2023-08-05T22:59:01.564927Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1887,
"topic": "gcn.circular",
"uuid": "ca133597-c8ce-42d7-8ebc-3ff35161e248",
"title": "GRB 230805B: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/06 21:46:11 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34353",
"subject": "GRB 230805B: Enhanced Swift-XRT position"
},
"message_text": "J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 3447 s of XRT Photon Counting mode data and 3 UVOT\nimages for GRB 230805B, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 207.74318, +31.19135 which is equivalent\nto:\n\nRA (J2000): 13h 50m 58.36s\nDec (J2000): +31d 11' 28.8\"\n\nwith an uncertainty of 2.1 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzU4Mzc3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9bpXai2w4NPymYihSvzgrFpIBlTXRzeZAA-9MRtd844\n\n",
"published": "2023-08-06T21:46:22.471663Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T21:46:22.471680Z",
"modified": "2023-08-06T21:46:22.477603Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1870,
"topic": "gcn.circular",
"uuid": "23b5c659-a9ca-4a17-b314-d16c2ada8a73",
"title": "GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/08/06 03:15:01 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34347",
"subject": "GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection"
},
"message_text": "Y.-D. Hu, I. Perez-Garcia, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy and F. J. Aceituno (IAA-CSIC), P. J. Meintjes and H. Van Heerden (UFS, SouthAfrica), A. Martin-Carrillo and L. Hanlon (UCD, Ireland), M. Gritsevich (Univ. of Helsinki) and C. J. Perez del Pulgar (UMA), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 230805B by Swift (Cenko et al. GCNC 34339), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) automatically observed the GRB location starting on Aug. 05, 17:15 UT (~ 5.9 h after trigger). No new optical source is detected on the co-added image (7 x 60 s, clear filter) within the enhanced Swift/XRT error region (D'Ai et al. GCNC 34345) down to 19.9 mag.\n\nWe also triggered the 1.5m telescope at Observatorio de Sierra Nevada in Granada (Spain), starting on Aug. 05, 20:30 UT (~ 9.1 h after trigger). At the position of the suggested optical afterglow reported by Moskvitin and Goranskij (GCNC 34343) we found a faint optical source for which we preliminary measure I = 22.9+/-0.4 (on a 12 x 150s co-added image), consistent with the fading reported by Malesani and Pursimo in the r-band (GCNC 34346).\n\nWe thank both the staff at Boyden and Sierra Nevada Observatories for their excellent support.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjkxNzA2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.WeS-uk-Foxifaprus8c02W_bCflz9EOaYrv1Gw3joVI\n\n",
"published": "2023-08-06T03:15:12.051421Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T03:15:12.051437Z",
"modified": "2023-08-06T03:15:12.060705Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2536,
"topic": "gcn.circular",
"uuid": "289c3c16-f31b-4472-b70a-442c06d7c3d9",
"title": "GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/08/27 18:35:09 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34576",
"subject": "GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj"
},
"message_text": "V. Swain, A Salgundi, R. Kumar, R. Sharma, H. Kumar, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:\n\nWe observed ZTF23abaanxz/AT2023qxj discovered by ZTF (M. L. Li et al., GCN 34574) in localization region of the Fermi GRB230827.256 (trigger No 714809315), with the 0.7m GROWTH-India Telescope (GIT). The observations started at 15:04:47 UT on 2023-08-27, roughly 8.9 hours after the Fermi GBM trigger. We obtained a 300s exposure in the r' filter. We clearly detected the candidate at the position reported by M. L. Li et al., GCN 34574. The photometric results are follow as:\n\n------------------------------------------------------------------------------------\njd (mid) | Filter | Total Exposure (s) | Magnitude (AB) |\n\n-------------------------------------------------------------------------------------\n\n2460184.13030952 | r' | 300 | 19.3 +/- 0.1 |\n\n-----------------------------------------------------------------------------------\n\nWe confirm that the object is still fading, thereby confirming it as an afterglow. The magnitude is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.\n\nThe 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/.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTYxMzE0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.deV-tO4nDwBCJvlqrZl_LN7AiRITS--sWBp-HFtq1Oo\n\n",
"published": "2023-08-27T18:35:19.042786Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T18:35:19.042805Z",
"modified": "2023-08-27T18:35:19.046842Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2537,
"topic": "gcn.circular",
"uuid": "4892efa5-c9d8-484c-8883-c259335a43c3",
"title": "Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico \"Nastro Verde\" optical observations",
"submitter": "Hop gcn.circular",
"authors": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"data": {
"date": "23/08/27 19:24:18 GMT",
"from": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34577",
"subject": "Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico \"Nastro Verde\" optical observations"
},
"message_text": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport:\nFollowing the Swift trigger no. 1186959 (GCN 34537), we pointed at the coordinates RA(J2000)\u0017h 27m 46s: Dec(J2000)=-16d 12' 53\" and started our observations with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy.\nMember of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione.\n\nThe observations started at 19:23 UT of 2023/08/24, after about 5,25 hours after the GRB trigger, at the end of twilight with clear skies, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 9 image of 120 sec each in fotometric V and 13 in Rc . All images, calibrated with masterdark and masterflat have been measured with Maxim DL software\nWe have detected a clear visible source at the enhanced position reported by Swift Burst Alert Telescope (BAT) (Page et al., GCN 34537 ) and by other telescopes ( Jamie A. Kennea (PSU) et al GCN 34540., S. Dichiara (PSU) et al GCN 34542, 34547, 34554,34555., Mohammad Odeh et al GCN 34543, 34561., H. Negoro (Nihon U). et al GCN 34544., Brendan O'Connor et al GCN 34549.,Dylan Dutton et al GCN 34556., T. M. Parsotan et al GCN 34557., U.Quadri et al GCN 34562., Claudio Lopresti et al GCN 34566., S. Leonini et al GCN 34573)\nat following position\n\nRA (J2000.0) 17:27:43.32\nDec (J2000.0) -16:12:19\n\nwith the following photometry:\n\n JD\t Mag\t Filter\n2460181.317\t13.69 V\n2460181.32\t13.74 V\n2460181.323\t13.66 V\n2460181.326\t13.59 V\n2460181.329\t13.63 V\n2460181.332\t13.55 V\n2460181.335\t13.54 V\n2460181.338\t13.62 V\n2460181.341\t13.55 V\n\n\n\nJD\t Mag\t Filter\n2460181.309\t13.49 Rc\n2460181.31\t13.51 Rc\n2460181.312\t13.54 Rc\n2460181.313\t13.45 Rc\n2460181.315\t13.47 Rc\n2460181.318\t13.48 Rc\n2460181.321\t13.50 Rc\n2460181.324\t13.52 Rc\n2460181.33\t13.45 Rc\n2460181.333\t13.46 Rc\n2460181.336\t13.50 Rc\n2460181.339\t13.50 Rc\n2460181.342\t13.50 Rc\n\n\n\nThe magnitudes are calibrated with stars of the PanSTARRS catalog, espressed in AB system and are not corrected for the expected Galactic extinction.\n\nThe peculiar transient ( detected by other observatories ) is confirmed in our observations. Further observations are encouraged.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTY0MjY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.IODmNIzKp1ESjKN4P5U4JEHuCruLLSbFFJa8MPbtAws\n\n",
"published": "2023-08-27T19:24:31.824174Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T19:24:31.824195Z",
"modified": "2023-08-27T19:24:31.830281Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2538,
"topic": "gcn.circular",
"uuid": "884a2281-898e-4508-9503-46ac23cc150e",
"title": "Fermi GRB 230827A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/27 19:31:03 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34578",
"subject": "Fermi GRB 230827A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 230827A ( Fermi GBM team, GCN 34575) errorbox 53 sec after notice time and 86 sec after trigger time at 2023-08-27 18:19:18 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 74 deg. The sun altitude is -18.8 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 230827A errorbox 61 sec after notice time and 94 sec after trigger time at 2023-08-27 18:19:27 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 70 deg. The sun altitude is -23.9 deg.\n\nThe galactic latitude b = -42 deg., longitude l = 25 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"61859\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 96 | 2023-08-27 18:19:18 | MASTER-Tavrida | (21h 16m 19.41s , -22d 49m 36.6s) | C | 20 | 13.7 |\n 104 | 2023-08-27 18:19:27 | MASTER-Kislovodsk | (21h 18m 43.33s , -22d 37m 28.1s) | C | 20 | 15.5 |\n 104 | 2023-08-27 18:19:27 | MASTER-Kislovodsk | (21h 23m 17.26s , -23d 01m 43.3s) | C | 20 | 14.5 |\n 127 | 2023-08-27 18:19:49 | MASTER-Tavrida | (21h 05m 33.35s , -22d 39m 05.5s) | C | 20 | 15.1 |\n 145 | 2023-08-27 18:20:07 | MASTER-Kislovodsk | (21h 18m 38.34s , -22d 38m 28.4s) | C | 20 | 15.5 |\n 145 | 2023-08-27 18:20:07 | MASTER-Kislovodsk | (21h 23m 12.27s , -23d 02m 45.3s) | C | 20 | 14.6 |\n 159 | 2023-08-27 18:20:16 | MASTER-Tavrida | (21h 05m 33.35s , -22d 38m 05.6s) | C | 30 | 15.4 |\n 190 | 2023-08-27 18:20:47 | MASTER-Kislovodsk | (21h 18m 44.53s , -22d 38m 17.4s) | C | 30 | 15.8 |\n 190 | 2023-08-27 18:20:47 | MASTER-Kislovodsk | (21h 23m 18.58s , -23d 02m 32.4s) | C | 30 | 14.9 |\n 201 | 2023-08-27 18:20:53 | MASTER-Tavrida | (21h 05m 39.14s , -22d 39m 06.7s) | C | 40 | 15.7 |\n 245 | 2023-08-27 18:21:37 | MASTER-Kislovodsk | (21h 18m 41.77s , -22d 36m 53.9s) | C | 40 | 15.9 |\n 245 | 2023-08-27 18:21:37 | MASTER-Kislovodsk | (21h 23m 16.72s , -23d 01m 12.9s) | C | 40 | 14.6 |\n 311 | 2023-08-27 18:22:38 | MASTER-Kislovodsk | (21h 18m 41.83s , -22d 38m 12.2s) | C | 50 | 16.0 |\n 311 | 2023-08-27 18:22:38 | MASTER-Kislovodsk | (21h 23m 16.69s , -23d 02m 30.9s) | C | 50 | 14.6 |\n 391 | 2023-08-27 18:23:48 | MASTER-Kislovodsk | (21h 18m 43.78s , -22d 36m 30.1s) | C | 70 | 16.1 |\n 391 | 2023-08-27 18:23:48 | MASTER-Kislovodsk | (21h 23m 18.49s , -23d 00m 48.5s) | C | 70 | 14.8 |\n 663 | 2023-08-27 18:27:55 | MASTER-Kislovodsk | (21h 15m 12.98s , -23d 39m 12.8s) | P- | 120 | 16.5 |\n 828 | 2023-08-27 18:27:55 | MASTER-Kislovodsk | (21h 15m 12.98s , -23d 39m 12.8s) | P- | 450 | 17.4 | Coadd\n 663 | 2023-08-27 18:27:55 | MASTER-Kislovodsk | (21h 15m 11.97s , -24d 02m 49.0s) | P| | 120 | 14.2 |\n 762 | 2023-08-27 18:29:24 | MASTER-Tavrida | (21h 12m 25.92s , -23d 55m 20.9s) | C | 140 | 16.4 |\n 818 | 2023-08-27 18:30:16 | MASTER-Kislovodsk | (21h 15m 19.41s , -23d 40m 15.8s) | P- | 150 | 16.6 |\n 818 | 2023-08-27 18:30:16 | MASTER-Kislovodsk | (21h 15m 18.09s , -24d 03m 58.0s) | P| | 150 | 15.0 |\n 926 | 2023-08-27 18:31:53 | MASTER-Tavrida | (21h 12m 23.87s , -23d 54m 04.8s) | C | 170 | 16.6 |\n 1109 | 2023-08-27 18:34:51 | MASTER-Tavrida | (21h 12m 23.91s , -23d 55m 43.2s) | C | 180 | 16.6 |\n 1204 | 2023-08-27 18:36:26 | MASTER-Kislovodsk | (21h 15m 19.86s , -23d 40m 56.0s) | P- | 180 | 16.8 |\n 1204 | 2023-08-27 18:36:26 | MASTER-Kislovodsk | (21h 15m 19.22s , -24d 04m 35.5s) | P| | 180 | 14.6 |\n 1297 | 2023-08-27 18:38:00 | MASTER-Tavrida | (21h 12m 26.53s , -23d 53m 56.3s) | C | 180 | 16.9 |\n 1404 | 2023-08-27 18:39:47 | MASTER-Kislovodsk | (21h 15m 16.77s , -23d 39m 34.8s) | P- | 180 | 16.7 |\n 1584 | 2023-08-27 18:39:47 | MASTER-Kislovodsk | (21h 15m 16.78s , -23d 39m 34.7s) | P- | 540 | 17.5 | Coadd\n 1404 | 2023-08-27 18:39:47 | MASTER-Kislovodsk | (21h 15m 15.26s , -24d 03m 02.1s) | P| | 180 | 14.5 |\n 1484 | 2023-08-27 18:41:06 | MASTER-Tavrida | (21h 12m 21.56s , -23d 54m 47.9s) | C | 180 | 16.9 |\n 1605 | 2023-08-27 18:43:07 | MASTER-Kislovodsk | (21h 15m 16.92s , -23d 40m 43.4s) | P- | 180 | 16.8 |\n 1605 | 2023-08-27 18:43:07 | MASTER-Kislovodsk | (21h 15m 16.75s , -24d 04m 26.4s) | P| | 180 | 14.6 |\n 1670 | 2023-08-27 18:44:12 | MASTER-Tavrida | (21h 12m 21.63s , -23d 53m 47.4s) | C | 180 | 16.9 |\n 1806 | 2023-08-27 18:46:28 | MASTER-Kislovodsk | (21h 15m 19.31s , -23d 39m 33.5s) | P- | 180 | 16.8 |\n 1806 | 2023-08-27 18:46:28 | MASTER-Kislovodsk | (21h 15m 18.56s , -24d 03m 08.4s) | P| | 180 | 14.6 |\n 1858 | 2023-08-27 18:47:20 | MASTER-Tavrida | (21h 12m 26.71s , -23d 54m 47.6s) | C | 180 | 16.9 |\n 2006 | 2023-08-27 18:49:49 | MASTER-Kislovodsk | (21h 15m 14.52s , -23d 40m 06.2s) | P- | 180 | 16.7 |\n 2006 | 2023-08-27 18:49:49 | MASTER-Kislovodsk | (21h 15m 13.77s , -24d 03m 41.7s) | P| | 180 | 14.6 |\n 2046 | 2023-08-27 18:50:28 | MASTER-Tavrida | (21h 12m 20.27s , -23d 55m 45.7s) | C | 180 | 17.2 |\n 2234 | 2023-08-27 18:53:37 | MASTER-Tavrida | (21h 12m 26.77s , -23d 55m 31.3s) | C | 180 | 17.3 |\n 2424 | 2023-08-27 18:56:46 | MASTER-Tavrida | (21h 12m 24.32s , -23d 53m 45.3s) | C | 180 | 17.4 |\n 2612 | 2023-08-27 18:59:54 | MASTER-Tavrida | (21h 12m 24.35s , -23d 55m 37.5s) | C | 180 | 17.3 |\n 2750 | 2023-08-27 19:02:12 | MASTER-Kislovodsk | (21h 15m 21.73s , -24d 03m 38.2s) | C | 180 | 15.0 |\n 2750 | 2023-08-27 19:02:12 | MASTER-Kislovodsk | (21h 15m 22.82s , -23d 39m 57.4s) | C | 180 | 13.7 |\n 2801 | 2023-08-27 19:03:04 | MASTER-Tavrida | (21h 12m 27.29s , -23d 53m 46.8s) | C | 180 | 17.5 |\n 2950 | 2023-08-27 19:05:33 | MASTER-Kislovodsk | (21h 15m 16.60s , -23d 40m 57.0s) | C | 180 | 15.6 |\n 2950 | 2023-08-27 19:05:33 | MASTER-Kislovodsk | (21h 15m 16.79s , -24d 04m 42.4s) | C | 180 | 14.7 |\n 2989 | 2023-08-27 19:06:11 | MASTER-Tavrida | (21h 12m 21.57s , -23d 54m 40.1s) | C | 180 | 17.5 |\n 3151 | 2023-08-27 19:08:53 | MASTER-Kislovodsk | (21h 22m 53.28s , -23d 47m 21.9s) | C | 180 | 15.8 |\n 3151 | 2023-08-27 19:08:53 | MASTER-Kislovodsk | (21h 22m 53.30s , -24d 11m 08.0s) | C | 180 | 14.9 |\n 3179 | 2023-08-27 19:09:22 | MASTER-Tavrida | (21h 12m 22.70s , -23d 53m 39.3s) | C | 180 | 17.5 |\n 3351 | 2023-08-27 19:12:14 | MASTER-Kislovodsk | (21h 22m 51.42s , -23d 45m 41.3s) | C | 180 | 15.6 |\n 3352 | 2023-08-27 19:12:14 | MASTER-Kislovodsk | (21h 22m 51.71s , -24d 09m 28.0s) | C | 180 | 14.8 |\n 3368 | 2023-08-27 19:12:30 | MASTER-Tavrida | (21h 12m 28.11s , -23d 54m 38.6s) | C | 180 | 17.5 |\n 3552 | 2023-08-27 19:15:34 | MASTER-Kislovodsk | (21h 22m 53.18s , -21d 47m 16.1s) | C | 180 | 15.8 |\n 3552 | 2023-08-27 19:15:34 | MASTER-Kislovodsk | (21h 22m 53.69s , -22d 10m 54.6s) | C | 180 | 14.7 |\n 3555 | 2023-08-27 19:15:38 | MASTER-Tavrida | (21h 12m 22.71s , -23d 55m 37.5s) | C | 180 | 17.8 |\n 3744 | 2023-08-27 19:18:46 | MASTER-Tavrida | (21h 12m 28.12s , -23d 55m 33.6s) | C | 180 | 17.6 |\n 3933 | 2023-08-27 19:21:55 | MASTER-Tavrida | (21h 12m 24.54s , -23d 53m 59.0s) | C | 180 | 17.7 |\n 3953 | 2023-08-27 19:22:15 | MASTER-Kislovodsk | (21h 22m 49.92s , -21d 46m 30.2s) | C | 180 | 15.7 |\n 3953 | 2023-08-27 19:22:15 | MASTER-Kislovodsk | (21h 22m 51.71s , -22d 10m 16.6s) | C | 180 | 14.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTY0NjY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3GPCVx8RY8zNHVPs3nrfKlxw5iYc__8Jrhb4rQoWlw0\n\n",
"published": "2023-08-27T19:31:13.787118Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T19:31:13.787153Z",
"modified": "2023-08-27T19:31:13.791839Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1876,
"topic": "gcn.circular",
"uuid": "75bcc310-1b90-4480-bb11-f6ec6c1bc62f",
"title": "GRB 230805B: Bassano Bresciano observatory upper limit",
"submitter": "Hop gcn.circular",
"authors": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"data": {
"date": "23/08/06 07:04:21 GMT",
"from": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"title": "GCN CIRCULAR",
"number": "34349",
"subject": "GRB 230805B: Bassano Bresciano observatory upper limit"
},
"message_text": "U.Quadri and L.Strabla (Bassano Bresciano Astronomical Observatory),\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport: \n\nWe imaged the field of GRB 230805B detected by SWIFT(trigger 1183217)\nwith the robotic telescope of (IAU station 565) Bassano Bresciano \nObservatory, Italy. Member of: \nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nGAC - Gruppo Astrofili Cremonesi.\n\nThe observations started 8.74 hour after the GRB trigger, At the end of twilight \nwith our Newton telescope D=250 mm F/D=4.8.\n\nWeather conditions were good.\n\nWe co-added 4 series of 20 exposures of 60 sec each.\n\nStart T0+     End T0+    CR lim\n8.74 hour  10.00 hour     19.5\n\nCR is unfiltered with R zero point\n\nWe did not found any optical counterpart in the error box of the XRTcandidate.\nS. B. Cenko (GSFC) et al. GCN 34339\n\nMagnitudes were estimated with the USNO-B1.0 cat. and \nare not corrected for galactic dust extinction.\n\nReference:\nhttp://www.osservatoriobassano.org/GRB.asp\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzA1NDY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.lyvi0NxsQy9W6f6UC4ky8V_Si1JtZbHu1FYuXMovyHw\n\n",
"published": "2023-08-06T07:04:32.394250Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T07:04:32.394265Z",
"modified": "2023-08-06T07:04:32.401169Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1877,
"topic": "gcn.circular",
"uuid": "45a06cb5-3553-410c-aeca-cec890e04ac1",
"title": "Fermi trigger No 712991593: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/06 08:48:18 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34350",
"subject": "Fermi trigger No 712991593: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230806.22 (trigger No 712991593,04h 03m 14.40s , +19d 34m 12.0s, R=2.32) errorbox 229 sec after notice time and 9907 sec after trigger time at 2023-08-06 07:58:16 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 73 deg. The sun altitude is -43.1 deg.\n\nThe galactic latitude b = -24 deg., longitude l = 173 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"50961\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 9998 | 2023-08-06 07:58:16 | MASTER-OAFA | (04h 01m 44.05s , +19d 29m 23.0s) | C | 180 | 16.9 |\n 10209 | 2023-08-06 08:01:47 | MASTER-OAFA | (04h 01m 43.93s , +19d 30m 23.6s) | C | 180 | 17.2 |\n 10421 | 2023-08-06 08:05:19 | MASTER-OAFA | (04h 01m 48.55s , +19d 29m 24.8s) | C | 180 | 17.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzExNzAzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.cS1cawxr5fB3V4IhGaNPH04w3x54e16D8ghMBwckxEk\n\n",
"published": "2023-08-06T08:48:29.102811Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T08:48:29.102827Z",
"modified": "2023-08-06T08:48:29.109796Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1882,
"topic": "gcn.circular",
"uuid": "1d3686ea-949b-4897-89d8-f8395e610990",
"title": "GRB 230805B: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Sam LaPorte at PSU <sjl5346@psu.edu>",
"data": {
"date": "23/08/06 18:02:19 GMT",
"from": "Sam LaPorte at PSU <sjl5346@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34351",
"subject": "GRB 230805B: Swift/UVOT Upper Limits"
},
"message_text": "GRB 230805B: Swift/UVOT Upper Limits\n\nS. J. LaPorte (PSU) and S. B. Cenko (GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230805B\n196 s after the BAT trigger (Cenko et al., GCN Circ. 34339).\nNo optical afterglow consistent with the XRT position\n(Evans et al., GCN Circ. 34345)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 196 345 147 >20.2\nu_FC 354 604 246 >19.5\nwhite 196 1878 284 >20.7\nv 683 1927 135 >19.0\nb 610 1854 136 >20.4\nu 354 1829 363 >19.6\nw1 732 1804 117 >19.4\nw2 1014 1730 58 >18.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.014 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzQ0OTQ1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.KFiKjtvatGTzsaV3cLj2ZglTID_btU_SLADlC-QLhlA\n\n",
"published": "2023-08-06T18:02:34.663191Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T18:02:34.663212Z",
"modified": "2023-08-06T18:02:34.670490Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1886,
"topic": "gcn.circular",
"uuid": "c54c2468-331f-457e-ac79-e8f437716319",
"title": "LIGO/Virgo/KAGRA S230806ak: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"data": {
"date": "23/08/06 21:27:57 GMT",
"from": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34352",
"subject": "LIGO/Virgo/KAGRA S230806ak: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230806ak during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-06 20:40:41.938 UTC (GPS\ntime: 1375389659.938). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230806ak is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3e-09 Hz, or about one in 10\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230806ak\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is 3%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 35 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n3749 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4578 +/- 1473 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzU3MjgyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7uGFsn4SRzNGy7QZnzDlUspLuKGUeCwY2W2IzQrzznE\n\n",
"published": "2023-08-06T21:28:08.056763Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T21:28:08.056779Z",
"modified": "2023-08-06T21:28:08.063889Z",
"nonlocalizedevents": [
{
"event_id": "S230806a"
}
],
"targets": []
},
{
"id": 4056,
"topic": "gcn.circular",
"uuid": "b6614db8-102d-4109-a977-583331f1744e",
"title": "GRB 231015A: NuSTAR Detection of Prompt Emission",
"submitter": "Hop gcn.circular",
"authors": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"data": {
"date": "23/10/20 19:34:41 GMT",
"from": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34859"
},
"title": "GCN CIRCULAR",
"number": "34859",
"subject": "GRB 231015A: NuSTAR Detection of Prompt Emission"
},
"message_text": "B. Grefenstette reports on behalf of the NuSTAR Search for INteresting Gamma-ray Signals (SINGS) working group:\n\nThe NuSTAR SINGS working group reports the discovery of prompt emission from a potential GRB 231015A in the NuSTAR CsI anti-coincidence shields. This GRB was identified through a blind search using the CsI shield rates. Details of the search algorithm will be described in a future paper. \n\nThe CsI data are recorded at 1 Hz and show a broad burst with multiple peaks. The initial NuSTAR trigger had a trigger time of 2023-10-15T23:49:35, which is one the rising edge of the slow, initial peak and is consistent with the onset time reported by GlowBug (Cheung et al, GCN Circ 3485). A stronger second peak is also seen, consistent with the strongest peak identified in the AstroSat data (2023-10-15T23:49:53, Waratkar et al, GCN Circ 3482).\n\nThe stronger second burst resulted in peak 1-sec count rates of ~3,000 counts per second in both the FPMA and FPMB shield units. Typical background rates are ~1,000 counts per second. The peak of the second burst is unresolved (e.g., shorter than the 1-s bins) with a decay back to quiescence of ~5-s. The first peak had a rise time of ~10-s and a longer overall duration.\n\nThe burst was detected in both the CdZnTe detectors. We see some emission associated with multiple peaks during the burst above 40 keV, though the number of counts is relatively modest (~10s of counts above 40 keV) so that more detailed analysis is limited by counting statistics.\n\nThe automated light curve report for this GRB, discovery report, off-line analysis of the shield data, and the CdZnTe lightcurves can be found here:\n\nhttps://nustarsoc.caltech.edu/NuSTAR_Public/grbs/reports/2023/231015A/\n\nInformation on NuSTAR SINGS can be found here: \n\nhttps://nustarsoc.caltech.edu/NuSTAR_Public/grbs/\n\nNuSTAR is a NASA Small Explorer mission led by Caltech and managed by JPL for NASAâs Science Mission Directorate in Washington. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34859.",
"published": "2023-10-20T19:34:50.311662Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T19:34:50.311691Z",
"modified": "2023-10-20T19:34:50.320596Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1889,
"topic": "gcn.circular",
"uuid": "427964b3-8ce3-4f9a-896a-b0404f9f5e90",
"title": "GRB 230806A: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"data": {
"date": "23/08/07 00:36:33 GMT",
"from": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34354",
"subject": "GRB 230806A: Fermi GBM Final Localization"
},
"message_text": "\nThe Fermi GBM team reports the detection of a likely SHORT GRB\n\n\"At 04:02:32.37 UT on 06 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230806A (trigger 712987357/230806168).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 63.12, Dec = -7.33 (J2000 degrees, equivalent to J2000 4h 12m, -7d 19'),\nwith a statistical uncertainty of 18.10 degrees.\n\nThe angle from the Fermi LAT boresight is 64 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230806168/quicklook/glg_skymap_all_bn230806168.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230806168/quicklook/glg_healpix_all_bn230806168.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230806168/quicklook/glg_lc_medres34_bn230806168.gif\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzY4NTk4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.1dsXP4E3_VmlDBWwW68ufVB_f-yN33xdq0SK_QK-eG0\n\n",
"published": "2023-08-07T00:36:44.452968Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T00:36:44.452985Z",
"modified": "2023-08-07T00:36:44.458943Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1891,
"topic": "gcn.circular",
"uuid": "8653c9b6-d17d-4e92-a9ca-57e84f49aec7",
"title": "LIGO/Virgo/KAGRA S230806ak: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/07 01:03:02 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34355",
"subject": "LIGO/Virgo/KAGRA S230806ak: Updated Sky localization and EM Bright Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230806ak (GCN Circular 34352). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230806ak\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230806ak is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3715 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5423 +/- 1862 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzcwMTg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.MXY4pmkh1NzHMkYrQE9ZFz-WTzwHUYTL2ubIualrFro\n\n",
"published": "2023-08-07T01:03:13.912533Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T01:03:13.912550Z",
"modified": "2023-08-07T01:03:13.917777Z",
"nonlocalizedevents": [
{
"event_id": "S230806a"
}
],
"targets": []
},
{
"id": 1892,
"topic": "gcn.circular",
"uuid": "ba912779-4be4-4c46-b668-48b49fcba4d7",
"title": "GRB 230805B : OHP/T193 optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"data": {
"date": "23/08/07 13:34:31 GMT",
"from": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34356",
"subject": "GRB 230805B : OHP/T193 optical upper limit"
},
"message_text": "D. Turpin (CEA Paris-Saclay), C. Adami (LAM), B. Schneider (MIT),\nE. Le Floc'h, D. Götz, F. Schüssler (CEA Paris-Saclay), A. de Ugarte Postigo (OCA/CNRS),\nS. Basa (LAM), S. D. Vergani (GEPI, Obs. de Paris), report on behalf\nof a larger collaboration:\n\nWe observed the field of GRB 230805B (Cenko et al., GCN 34339; D'Ali et al.,\nGCN 34345; LaPorte et al., GCN 34251; Osborne et al. GCN 34353)\nusing the T193cm telescope at Observatoire de Haute-Provence (France)\nequipped with the MISTRAL spectro-imager. In 5 exposures, obtained\nin the r-band (5x600s) from 2023 05 August 20:36:08 UT to\n21:34:34 UT (mid-time ~9.69h after trigger) under poor seeing conditions,\nwe do not detect any source at the position reported by\nMoskvitin et al., GCN 34343; Malesani et al., GCN 34346; Hu et al., GCN 34347\ndown to the following 5-sigma limit:\n\nr > 21.5 mag (AB)\n\nThe photometric calibration was performed using nearby stars from\nthe PanSTARRS catalog and the magnitude is not corrected for Galactic\nextinction.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence,\nin particular Jean Balcaen for the MISTRAL observations and\nthe SOPHIE observer Lisa Altinier. \n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDE1Mjc2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.5-aqy2o0vzRNTReu2rbbQhfIT6wTiQ7HtIJ822GieiY\n\n",
"published": "2023-08-07T13:34:47.010888Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T13:34:47.010935Z",
"modified": "2023-08-07T13:34:47.019029Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1893,
"topic": "gcn.circular",
"uuid": "591eb919-392b-4591-9204-94cd38ff71a1",
"title": "GRB 230805B: Fermi GBM observation",
"submitter": "Hop gcn.circular",
"authors": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
"data": {
"date": "23/08/07 14:40:05 GMT",
"from": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
"title": "GCN CIRCULAR",
"number": "34357",
"subject": "GRB 230805B: Fermi GBM observation"
},
"message_text": "J.Mangan (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:\n\n\"At 11:23:33.59 UT on 05 August 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230805B (trigger 712927418 / 230805475),\nwhich was also detected by Swift BAT (S. B. Cenko et al. 2023, GCN 34339).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 48 degrees.\n\nThe GBM light curve consists of multiple emissions\nwith a duration (T90) of about 60 s (50-300 keV).\nThe time-averaged spectrum from T0-0 s to T0+60.5 s is best fit by\na simple power law function with index -1.4 +/- 0.03\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.8 +/- 0.3)E-6 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+-0.1 s in the 10-1000 keV band\nis 2.3 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDE5MjEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Il2Zt4Yfnqvmdb_GdpyJiguTj_1xg4IaELx5iosQyB0\n\n",
"published": "2023-08-07T14:40:18.328539Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T14:40:18.328556Z",
"modified": "2023-08-07T14:40:18.336660Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1894,
"topic": "gcn.circular",
"uuid": "0d3cf57f-8823-4947-b58b-b94034325795",
"title": "Konus-Wind detection of GRB 230803A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/08/07 15:47:20 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "34358",
"subject": "Konus-Wind detection of GRB 230803A"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long GRB 230803A (Fermi GBM detection: Fermi GBM team, GCN 34325;\nAstroSat CZTI detection: Navaneeth et al., GCN 34328;\nIPN triangulation: Kozyrev et al., GCN 34330)\ntriggered Konus-Wind (KW) at T0=5229.064 s UT (01:27:09.064).\n\nThe burst light curve shows a multi-peaked structure\nwith a total duration of ~126 s.\nThe emission is seen up to ~2 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230803_T05229/\n\nAs observed by Konus-Wind, the burst had\na fluence of (7.59 ± 0.88)x10^-5 erg/cm^2 and\na 64-ms peak energy flux, measured from T0 + 93.760 s,\nof (1.43 ± 0.13)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0+57.600 to T0+128.256 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -1.30 (-0.06,+0.08),\nthe high energy photon index beta = -2.65 (-0.82,+0.30),\nthe peak energy Ep = 256 (-31,+32) keV,\nchi2 = 112/97 dof.\n\nThe spectrum near the peak count rate (measured from T0+90.368 to T0+95.488 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.93 (-0.06,+0.07),\nthe high energy photon index beta = -2.32 (-0.20,+0.14),\nthe peak energy Ep = 284 (-38,+40) keV,\nchi2 = 66/77 dof.\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDIzMjQ1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.m5rUb8AfJYe6Rt4gIJMgCBiGpvcC7gty1Cyok1Q7kVc\n\n",
"published": "2023-08-07T15:47:33.871991Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T15:47:33.872007Z",
"modified": "2023-08-07T15:47:33.880872Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1895,
"topic": "gcn.circular",
"uuid": "7377b304-1058-45fd-9fd2-6e2f9debf54b",
"title": "LIGO/Virgo/KAGRA S230805x: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/08/07 15:58:47 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34359",
"subject": "LIGO/Virgo/KAGRA S230805x: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT was observing 83.45% of the GW localization probability (bayestar.multiorder.fits) at merger time. A fraction 31.75 % of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK 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).\n\nUpon 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.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n-------------------------------\n0.256 12.0 7.8 6.8 8.8\n1.024 6.1 4.0 3.5 4.5\n4.096 3.3 2.1 1.9 2.4\n16.384 2.0 1.3 1.1 1.5\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8219098\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.8219106\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDIzOTMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.kP9NRtdzTsIM_KUKuSj7EA73ssWwvU1-9ahjtE7ifWM\n\n",
"published": "2023-08-07T15:58:58.140361Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T15:58:58.140384Z",
"modified": "2023-08-07T15:58:58.147355Z",
"nonlocalizedevents": [
{
"event_id": "S230805x"
}
],
"targets": []
},
{
"id": 2539,
"topic": "gcn.circular",
"uuid": "fea03aa8-695c-41f3-ba2a-5ea4961322de",
"title": "GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/08/27 19:53:53 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34579",
"subject": "GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)"
},
"message_text": "Mohammad Odeh, Osama Ghannam, Anas Mohammad, Khalfan Al-Noaimy, and Sameh\nAl-Ashi, report on behalf of Al-Khatim Observatory (AKO) operated by the\nInternational Astronomical Center in Abu Dhabi, UAE:\n\nWe observed ZTF23abaanxz (AT 2023qxj) discovered by ZTF (M. L. Li et al.,\nGCN 34574) in the localization region of the Fermi GRB230827.256 (trigger\nNo 714809315), with our 0.36m f/7.7 robotic telescope. The observation was\ndone on 27 August 2023 starting from 18:12 (UT), about 12 hours after the\nGRB trigger.\n\nWe obtained multiple 180-sec exposures in Ic and R filters. We detected the\ncandidate at the position reported by (M. L. Li et al., GCN 34574) and\nconfirmed by (Swain et al., GCN 34576).\n\nThe following observations were calculated using the Atlas catalogue as a\nreference:\n-----------------------------------------------------------------------------\nObsTime (mid), t(mid) â t(0) (hours), Exposure (sec), Filter, Mag\n-----------------------------------------------------------------------------\n2023-08-27T18:31:42Z, 12.4, 13 x 180s (stacked), Ic, 18.2 +/- 0.21\n\n2023-08-27T19:19:30Z, 13.2, 16 x 180s (stacked), R, 19.1 +/- 0.23\n-----------------------------------------------------------------------------\n\nThe magnitudes are not corrected for galactic extinction.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTY2MDM5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.OoIcpLpPfUmBGncilNkls6wYiJXzR6VHBe2ijcdYlMg\n\n",
"published": "2023-08-27T19:54:05.129623Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T19:54:05.129642Z",
"modified": "2023-08-27T19:54:05.133463Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1901,
"topic": "gcn.circular",
"uuid": "6755d0dd-693b-49d8-8bec-dd107a0377e3",
"title": "LIGO/Virgo/KAGRA S230807f: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"data": {
"date": "23/08/07 21:46:40 GMT",
"from": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34360",
"subject": "LIGO/Virgo/KAGRA S230807f: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230807f during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-07 20:50:45.416 UTC (GPS\ntime: 1375476663.416). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230807f is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 7.1e-08 Hz, or about one in 5\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230807f\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (86%), Terrestrial (14%), NSBH (<1%), or BNS\n(<1%).\n\nThere was a high rate of noise transients (glitches) in both the LIGO\nLivingston and Hanford detectors which may affect the parameters or the significance\nof the candidate.\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is 4%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 35 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n6088 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 6818 +/- 2379 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDQ0ODA1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.B-yzwefh2S-1h2Ra7OaFIiO18HVyksvS6zmgv-Ne5KI\n\n",
"published": "2023-08-07T21:46:50.744594Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T21:46:50.744615Z",
"modified": "2023-08-07T21:46:50.753408Z",
"nonlocalizedevents": [
{
"event_id": "S230807f"
}
],
"targets": []
},
{
"id": 2540,
"topic": "gcn.circular",
"uuid": "81930e4a-da51-4701-90e0-d506000ed528",
"title": "Fermi trigger No 714809315: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/27 20:30:43 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34580",
"subject": "Fermi trigger No 714809315: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB230827.26 (trigger No 714809315,19h 57m 16.80s , +56d 28m 12.0s, R=2.17) errorbox 43424 sec after notice time and 43457 sec after trigger time at 2023-08-27 18:12:48 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 16 deg. The sun altitude is -17.8 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB230827.26 errorbox 51151 sec after notice time and 51184 sec after trigger time at 2023-08-27 20:21:35 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 22 deg. The sun altitude is -35.7 deg.\n\nThe galactic latitude b = 14 deg., longitude l = 90 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"61201\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 43548 | 2023-08-27 18:12:48 | MASTER-Tavrida | (19h 46m 06.01s , +57d 21m 28.8s) | C | 180 | 18.8 |\n 51214 | 2023-08-27 20:21:35 | MASTER-Kislovodsk | (19h 48m 46.64s , +57d 14m 17.4s) | C | 60 | 17.4 |\n 51214 | 2023-08-27 20:21:35 | MASTER-Kislovodsk | (19h 48m 21.11s , +57d 37m 43.3s) | C | 60 | 14.8 |\n 51295 | 2023-08-27 20:22:55 | MASTER-Kislovodsk | (19h 48m 46.58s , +57d 12m 34.0s) | C | 60 | 17.0 |\n 51295 | 2023-08-27 20:22:55 | MASTER-Kislovodsk | (19h 48m 19.15s , +57d 35m 59.8s) | C | 60 | 16.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTY4MjQ4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9._N8r_vEwSWChsdXrRt4zL-AVW1_etGMs0Me75-5Hx2A\n\n",
"published": "2023-08-27T20:30:55.598176Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T20:30:55.598198Z",
"modified": "2023-08-27T20:30:55.603594Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1902,
"topic": "gcn.circular",
"uuid": "90ddc965-29be-4993-9d78-3a731afff964",
"title": "GRB 230807A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/07 22:35:36 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34361",
"subject": "GRB 230807A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 22:25:01 UT on 7 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230807A (trigger 713139906.818582 / 230807934).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 73.3, Dec = -51.0 (J2000 degrees, equivalent to J2000 04h 53m, -51d 00'), with a statistical uncertainty of 3.5 degrees.\n\nThe angle from the Fermi LAT boresight is 96.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230807934/quicklook/glg_skymap_all_bn230807934.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230807934/quicklook/glg_healpix_all_bn230807934.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230807934/quicklook/glg_lc_medres34_bn230807934.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDQ3NzQxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3HtcCqbaofALmA6CMWBdTvWPttNA94nfv4mGGOJNUXU\n\n",
"published": "2023-08-07T22:35:47.013813Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T22:35:47.013832Z",
"modified": "2023-08-07T22:35:47.022061Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1903,
"topic": "gcn.circular",
"uuid": "65eaab27-05e2-4d2f-a943-df65234a2b17",
"title": "Fermi trigger No 713134237: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/08 00:45:40 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34362",
"subject": "Fermi trigger No 713134237: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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 GRB230807.87 (trigger No 713134237,05h 37m 40.01s , -31d 58m 00.1s, RP) errorbox 6409 sec after notice time and 6444 sec after trigger time at 2023-08-07 22:37:57 UT, with upper limit up to 18.1 mag. The observations began at zenith distance = 80 deg. The sun altitude is -74.3 deg.\n\nThe galactic latitude b = -28 deg., longitude l = 236 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"51304\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 6475 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 52m 47.80s , -51d 03m 55.2s) | C | 60 | 17.3 |\n 6535 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 52m 47.80s , -51d 03m 55.2s) | C | 180 | 17.9 | Coadd\n 6475 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 51m 35.23s , -51d 03m 20.2s) | C | 60 | 17.4 |\n 6535 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 51m 35.21s , -51d 03m 20.2s) | C | 180 | 18.1 | Coadd\n 6554 | 2023-08-07 22:39:16 | MASTER-SAAO | (04h 52m 47.69s , -51d 02m 55.7s) | C | 60 | 17.2 |\n 6554 | 2023-08-07 22:39:16 | MASTER-SAAO | (04h 51m 35.14s , -51d 02m 20.1s) | C | 60 | 17.3 |\n 6646 | 2023-08-07 22:40:48 | MASTER-SAAO | (04h 52m 53.74s , -51d 03m 56.6s) | C | 60 | 17.3 |\n 6646 | 2023-08-07 22:40:48 | MASTER-SAAO | (04h 51m 41.02s , -51d 03m 21.5s) | C | 60 | 17.4 |\n 6736 | 2023-08-07 22:42:19 | MASTER-SAAO | (04h 52m 46.43s , -51d 04m 58.9s) | C | 60 | 16.9 |\n 6736 | 2023-08-07 22:42:19 | MASTER-SAAO | (04h 51m 33.61s , -51d 04m 23.3s) | C | 60 | 17.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDU1NTQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.y-DZhbcGQ_DupmhtioLKYRLE2Grp66eZ4vMGQ4KKnZ8\n\n",
"published": "2023-08-08T00:45:51.641333Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T00:45:51.641353Z",
"modified": "2023-08-08T00:45:51.648582Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1904,
"topic": "gcn.circular",
"uuid": "abd9175b-9550-4a50-951a-028833005844",
"title": "Fermi GRB 230807A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/08 00:45:47 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34363",
"subject": "Fermi GRB 230807A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-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 230807A ( Fermi GBM team, GCN 34361) errorbox 740 sec after notice time and 775 sec after trigger time at 2023-08-07 22:37:57 UT, with upper limit up to 18.1 mag. The observations began at zenith distance = 80 deg. The sun altitude is -74.3 deg.\n\nThe galactic latitude b = -39 deg., longitude l = 258 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"51439\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 805 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 52m 47.80s , -51d 03m 55.2s) | C | 60 | 17.3 |\n 865 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 52m 47.80s , -51d 03m 55.2s) | C | 180 | 17.9 | Coadd\n 805 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 51m 35.23s , -51d 03m 20.2s) | C | 60 | 17.4 |\n 865 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 51m 35.21s , -51d 03m 20.2s) | C | 180 | 18.1 | Coadd\n 885 | 2023-08-07 22:39:16 | MASTER-SAAO | (04h 52m 47.69s , -51d 02m 55.7s) | C | 60 | 17.2 |\n 885 | 2023-08-07 22:39:16 | MASTER-SAAO | (04h 51m 35.14s , -51d 02m 20.1s) | C | 60 | 17.3 |\n 977 | 2023-08-07 22:40:48 | MASTER-SAAO | (04h 52m 53.74s , -51d 03m 56.6s) | C | 60 | 17.3 |\n 977 | 2023-08-07 22:40:48 | MASTER-SAAO | (04h 51m 41.02s , -51d 03m 21.5s) | C | 60 | 17.4 |\n 1067 | 2023-08-07 22:42:19 | MASTER-SAAO | (04h 52m 46.43s , -51d 04m 58.9s) | C | 60 | 16.9 |\n 1067 | 2023-08-07 22:42:19 | MASTER-SAAO | (04h 51m 33.61s , -51d 04m 23.3s) | C | 60 | 17.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDU1NTUyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9GL8Y-OdP1Su-9-dwjuF8a7Y0SM7kRyHegWySXAs4NQ\n\n",
"published": "2023-08-08T00:45:57.663113Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T00:45:57.663131Z",
"modified": "2023-08-08T00:45:57.669230Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6291,
"topic": "gcn.circular",
"uuid": "a3a2b978-fbc2-4149-b0b8-f0a901dbf1d6",
"title": "GRB 240328A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/03/28 12:39:20 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35986"
},
"title": "GCN CIRCULAR",
"number": "35986",
"subject": "GRB 240328A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 12:21:22 UT on 28 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240328A (trigger 733321287.517204 / 240328515).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 231.9, Dec = -3.8 (J2000 degrees, equivalent to J2000 15h 27m, -3d 47'), with a statistical uncertainty of 15.9 degrees.\n\nThe angle from the Fermi LAT boresight is 91.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240328515/quicklook/glg_skymap_all_bn240328515.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240328515/quicklook/glg_healpix_all_bn240328515.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240328515/quicklook/glg_lc_medres34_bn240328515.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35986.",
"published": "2024-03-28T12:39:37.692979Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-28T12:39:37.693002Z",
"modified": "2024-03-28T12:39:37.698392Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1907,
"topic": "gcn.circular",
"uuid": "4513159a-1367-49aa-85b6-d2fa4adbb7bf",
"title": "transient SPT-SVJ025406.5-702837: ATCA follow-up observations",
"submitter": "Hop gcn.circular",
"authors": "Dougal Dobie at Swinburne University of Technology <ddobie94@gmail.com>",
"data": {
"date": "23/08/08 02:44:48 GMT",
"from": "Dougal Dobie at Swinburne University of Technology <ddobie94@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34364",
"subject": "transient SPT-SVJ025406.5-702837: ATCA follow-up observations"
},
"message_text": "A. Gulati (U. Sydney), D. Dobie (Swinburne/OzGrav), A.Y.Q Ho\n(Cornell), D.L. Kaplan (UW Milwaukee), T. Murphy (U. Sydney)\n\nWe observed the location of SPT-SVJ025406.5-702837 (GCN #34301)\nfor 8.5 hours starting from 2023-08-04T22:00 with the Australia\nTelescope Compact Array (ATCA). Observations were conducted with\nthe C/X receiver with 2x2048 MHz bands centered on 5.5 and 9 GHz.\n\nWe find marginal (3 sigma) evidence for a source located at\n\nRA: 02:54:04.74\nDec: -70:28:37.2,\n\noffset from the coordinates of SPT-SVJ025406.5-702837 by ~9\narcseconds, but within the reported 12 arcseconds uncertainty.\n\nThe source has a flux density of 42+/-12 uJy at 9 GHz but is not\ndetected at 5.5 GHz with a 3-sigma upper limit of ~40 uJy,\nimplying a spectral index of alpha >~ 0.1.\n\nWe acknowledge the Gomeroi people as the traditional owners of the\nObservatory site. The Australia Telescope Compact Array is part of\nthe Australia Telescope National Facility (https://ror.org/05qajvd42)\nwhich is funded by the Australian Government for operation as a\nNational Facility managed by CSIRO.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDYyNjk0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ZJeU018tPJ1DeTTdy_3o59PKsbPDATMQg1-RgMX4BLY\n\n",
"published": "2023-08-08T02:44:59.343571Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T02:44:59.343592Z",
"modified": "2023-08-08T02:44:59.352638Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1909,
"topic": "gcn.circular",
"uuid": "526856e0-8cfc-4f9c-ac4c-f0a48c2e124c",
"title": "LIGO/Virgo/KAGRA S230807f: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/08 02:53:38 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34365",
"subject": "LIGO/Virgo/KAGRA S230807f: Updated Sky localization and EM Bright Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230807f (GCN Circular 34360). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230807f\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230807f is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 5436 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5272 +/- 1900 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDYzMjI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9rLmOhPUUswez1-uEnV_5HvXlmId3mjdJNKLPUpa-U8\n\n",
"published": "2023-08-08T02:53:49.625738Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T02:53:49.625756Z",
"modified": "2023-08-08T02:53:49.631579Z",
"nonlocalizedevents": [
{
"event_id": "S230807f"
}
],
"targets": []
}
]
}
