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{
"id": 5396,
"topic": "gcn.circular",
"uuid": "40a2d489-6654-40ce-847e-b03fd70239c5",
"title": "GRB 231215A: AMI-LA radio detection",
"submitter": "Hop gcn.circular",
"authors": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"data": {
"date": "23/12/18 15:27:07 GMT",
"from": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35397"
},
"title": "GCN CIRCULAR",
"number": "35397",
"subject": "GRB 231215A: AMI-LA radio detection"
},
"message_text": "Lauren Rhodes, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:\n\nWe observed the field of the afterglow candidate GRB 231215A (GCN 35343) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 19:57:45 on 17-Dec-2023 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J0102+5824 was used as an interleaved complex gain calibrator.\n\nWe detect an unresolved radio source at the position of the afterglow candidate as reported in GCN 35345 with a flux density of ~220uJy/beam.\n\nFurther observations are planned. We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35397.",
"published": "2023-12-18T15:27:19.140338Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-18T15:27:19.140355Z",
"modified": "2023-12-18T15:27:19.148038Z",
"nonlocalizedevents": [],
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},
{
"id": 6936,
"topic": "gcn.circular",
"uuid": "087eb5b9-ddfa-488f-9cca-5c19995d75a1",
"title": "LIGO/Virgo/KAGRA S240422ed: No significant candidates in GRANDMA and Kilonova-Catcher galaxy targeting observations",
"submitter": "Hop gcn.circular",
"authors": "J.-G. Ducoin at CPPM <ducoin@cppm.in2p3.fr>",
"data": {
"date": "24/04/25 12:14:55 GMT",
"from": "J.-G. Ducoin at CPPM <ducoin@cppm.in2p3.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36299"
},
"title": "GCN CIRCULAR",
"number": "36299",
"subject": "LIGO/Virgo/KAGRA S240422ed: No significant candidates in GRANDMA and Kilonova-Catcher galaxy targeting observations"
},
"message_text": "J.-G. Ducoin (CPPM), S. Antier (OCA), A. Klotz (IRAP), S. Karpov (FZU), C. Andrade (UMN), P. Gokuldass (ERAU), M. Masek (FZU), Y. Rajabov (UBAI),M. Coughlin (UMN), P.A. Duverne (APC), P. Hello (IJCLAB), I. Tosta e Melo (UniCT-DFA), T. Pradier (Unistra/IPHC), D. Turpin (CEA), D. Akl (AUS), T. Guillot, L. Abe, K. Agabi, (OCA-Lagrange), V. Deloupy (Concordia), A.Takey, A. Shokry, E. Elhosseiny, M. Molham, A. Tawfeek (NRIAG), K. Noysena, A. Tanasan (NARIT), M. Freeberg (KNC), P. Jacquiery (KNC), J-P Vignes (KNC), H-B Eggenstein (KNC), T. Husseno-Desenonges (IJCLab), P. Gokuldass (ERAU), M. Masek (FZU), Y. Rajabov (UBAI)\nReport on behalf of GRANDMA collaboration.\n\nWe spatially cross-matched the LIGO/Virgo S240422ed event skymap (90% probability volume) with the mangrove [1] galaxy catalog and found 2244 compatible galaxies (see [1] for details). We ranked theses galaxies according to the grade presented in [1] which include the galaxies' stellar mass to characterize their probability for hosting the event.\n\nThe list of the top galaxies ranked using this grade has been shared for observation between the ASTEP telescope located at Concordia Station, LesMakes-T60 located at La Reunion, KAO in Egypte, TRT operated from Thailand and Kilonova-Catcher (KNC) telescopes. We started observations on 2024-04-23T09:49:17 (0.51 day after the GW trigger). Some of the observations were affected by the moon. We report in the following table the list of observed galaxies, as well as the achieved limiting magnitude (5 sigma, in AB, calibrated using the Skymapper and Gaia DR3 catalog) and the delay in hours between the gravitational-wave trigger and the observation. We observed a total of 47 galaxies. Some of the galaxies are reported more than once as they have been observed several times.\n\nWe also observed 14 NED galaxies provided in GCN 36243 with the Les Makes-T60 telescope located in La Reunion-France. We provide in the following table the list of observed NED galaxies, as well as the achieved limiting magnitude (5 sigma, in AB, calibrated using Pan-STARRS or GAIA catalog) and the delay in hours between the gravitational-wave trigger and the observation.\n\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| Name | RA | DEC | Telescope | Filter | Upp.Lim. | T-T0 |\n| | [deg] | [deg] | | | (AB) | (day) |\n+========================+=========+=========+===============+==========+===========+=========+\n| 2MASS 08164547-2036118 | 124.189 | -20.603 | KNC-BBO | none | 18.8 | 0.61 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80759 | 124.147 | -20.683 | KNC-BBO | none | 18.8 | 0.61 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08165587-2030038 | 124.233 | -20.501 | KNC-BBO | none | 18.8 | 0.61 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80752.0 | 124.140 | -20.662 | KNC-BBO | none | 18.8 | 0.61 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08163364-2039438 | 124.140 | -20.662 | KNC-BBO | none | 18.8 | 0.61 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80216 | 122.729 | -30.858 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08110559-3052307 | 122.773 | -30.875 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08104184-3049078 | 122.674 | -30.819 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08111639-3054237 | 122.818 | -30.907 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08104410-3051237 | 122.684 | -30.857 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08103066-3051348 | 122.628 | -30.860 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80193 | 122.665 | -30.809 | KNC-BBO | none | 19.0 | 0.58 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08071354-3157294 | 121.806 | -31.958 | KNC-BBO | none | 18.7 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 86175 | 123.254 | -28.884 | KNC-T30 | Rc | 19.3 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80488 | 123.465 | -29.125 | KNC-T30 | Rc | 19.3 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08133323-2850151 | 123.388 | -28.838 | KNC-T30 | Rc | 19.3 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08131441-2911156 | 123.310 | -29.188 | KNC-T30 | Rc | 19.3 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08130655-2908526 | 123.277 | -29.148 | KNC-T30 | Rc | 19.3 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08143740-2902031 | 123.656 | -29.034 | KNC-T30 | Rc | 19.3 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA ESO494-024 | 121.461 | -25.980 | KNC-T30 | Rc | 19.7 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA ESO494-028 | 121.661 | -25.986 | KNC-T30 | Rc | 19.7 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 79714 | 121.469 | -25.806 | KNC-T30 | Rc | 19.7 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA ESO494-020 | 121.266 | -26.028 | KNC-T30 | Rc | 19.7 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 79708 | 121.459 | -26.194 | KNC-T30 | Rc | 19.7 | 0.54 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08071354-3157294 | 121.806 | -31.958 | KNC-T30 | Rc | 19.1 | 0.51 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08063696-3159148 | 121.654 | -31.987 | KNC-T30 | Rc | 19.1 | 0.51 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08064207-3212208 | 121.675 | -32.206 | KNC-T30 | Rc | 19.1 | 0.51 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08070171-3143024 | 121.757 | -31.717 | KNC-T30 | Rc | 19.1 | 0.51 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80216 | 122.729 | -30.858 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08110559-3052307 | 122.773 | -30.875 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08113768-3107111 | 122.907 | -31.120 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08104184-3049078 | 122.674 | -30.819 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08111639-3054237 | 122.818 | -30.907 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80155 | 122.541 | -30.875 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08104410-3051237 | 122.684 | -30.857 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08103066-3051348 | 122.628 | -30.860 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08113029-3105311 | 122.876 | -31.092 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08113582-3103321 | 122.899 | -31.059 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08101605-3050510 | 122.567 | -30.848 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80193 | 122.665 | -30.809 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08113073-3043231 | 122.878 | -30.723 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08101761-3053547 | 122.573 | -30.899 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08114118-3108561 | 122.922 | -31.149 | KNC-T30 | Rc | 19.6 | 0.52 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08164547-2036118 | 124.189 | -20.603 | KNC-T30 | Rc | 19.6 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80783 | 124.209 | -20.301 | KNC-T30 | Rc | 19.6 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08164361-2048408 | 124.182 | -20.811 | KNC-T30 | Rc | 19.6 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80759 | 124.147 | -20.683 | KNC-T30 | Rc | 19.6 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80788 | 124.217 | -20.764 | KNC-T30 | Rc | 19.7 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80813 | 124.263 | -20.459 | KNC-T30 | Rc | 19.7 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80786 | 124.211 | -20.292 | KNC-T30 | Rc | 19.7 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08165587-2030038 | 124.233 | -20.501 | KNC-T30 | Rc | 19.7 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| HyperLEDA 80752.0 | 124.140 | -20.662 | KNC-T30 | Rc | 19.7 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08163364-2039438 | 124.140 | -20.662 | KNC-T30 | Rc | 19.7 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08184404-2110574 | 124.683 | -21.182 | KAO | sdssr | 18.7 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08022869-2912339 | 120.619 | -29.209 | TRT | B | 19.5 | 0.53 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08141910-3223169 | 123.580 | -32.388 | ATSEP | I | 16.82 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08142478-3225000 | 123.603 | -32.417 | ATSEP | I | 16.82 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08133325-3211415 | 123.389 | -32.195 | ATSEP | I | 16.82 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08131820-3213245 | 123.326 | -32.223 | ATSEP | I | 16.82 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08142691-3225380 | 123.612 | -32.427 | ATSEP | I | 16.82 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| 2MASS 08151998-3155500 | 123.833 | -31.931 | ATSEP | I | 16.82 | 0.83 |\n+========================+=========+=========+===============+==========+===========+=========+\n| WISEA J082138 | 125.410 | -33.017 | Les Makes-T60 | sdssg | 18.3 | 0.92 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J082137 | 125.407 | -21.570 | Les Makes-T60 | sdssr | 19.5 | 0.86 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J082137 | 125.407 | -21.570 | Les Makes-T60 | sdssg | 19.4 | 0.86 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J081655 | 124.232 | -31.431 | Les Makes-T60 | sdssg | 19.5 | 0.84 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J081655 | 124.232 | -31.431 | Les Makes-T60 | sdssr | 19.5 | 0.84 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080923 | 122.347 | -31.137 | Les Makes-T60 | sdssg | 19.2 | 0.88 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080923 | 122.347 | -31.137 | Les Makes-T60 | sdssr | 19.2 | 0.88 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080659 | 121.749 | -40.731 | Les Makes-T60 | sdssg | 19.3 | 0.87 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080659 | 121.749 | -40.731 | Les Makes-T60 | sdssr | 19.4 | 0.87 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080557 | 121.489 | -26.831 | Les Makes-T60 | sdssg | 19.5 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080557 | 121.489 | -26.831 | Les Makes-T60 | sdssr | 19.6 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080353 | 120.972 | -26.408 | Les Makes-T60 | sdssg | 18.5 | 0.90 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080353 | 120.972 | -26.408 | Les Makes-T60 | sdssr | 18.6 | 0.91 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080229 | 120.622 | -26.766 | Les Makes-T60 | sdssg | 19.4 | 0.85 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080229 | 120.622 | -26.766 | Les Makes-T60 | sdssr | 19.5 | 0.85 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080228 | 120.620 | -29.209 | Les Makes-T60 | sdssg | 19.8 | 0.80 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J080228 | 120.620 | -29.209 | Les Makes-T60 | sdssr | 19.7 | 0.80 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075840 | 119.668 | -22.087 | Les Makes-T60 | sdssg | 17.6 | 0.91 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075840 | 119.668 | -22.087 | Les Makes-T60 | sdssr | 17.9 | 0.92 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075824 | 119.603 | -34.227 | Les Makes-T60 | sdssg | 19.0 | 0.88 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075824 | 119.603 | -34.227 | Les Makes-T60 | sdssr | 19.2 | 0.89 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075810 | 119.546 | -27.776 | Les Makes-T60 | sdssg | 19.7 | 0.82 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075810 | 119.546 | -27.776 | Les Makes-T60 | sdssr | 19.9 | 0.83 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075804 | 119.519 | -27.298 | Les Makes-T60 | sdssg | 19.9 | 0.81 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075804 | 119.519 | -27.298 | Les Makes-T60 | sdssr | 19.8 | 0.82 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075643 | 119.180 | -24.578 | Les Makes-T60 | sdssg | 18.6 | 0.89 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n| WISEA J075643 | 119.180 | -24.578 | Les Makes-T60 | sdssr | 18.7 | 0.90 |\n+------------------------+---------+---------+---------------+----------+-----------+---------+\n\nIn our low latency analysis (Antier & Karpov, in prep), comparing to the Gaia catalog, we did not find any new candidates in our frames from LesMakes-T60 within the nearby the galaxies mentioned above.\n\nIn addition, we checked if counterpart candidates mentionned in previous GCN were in our images : Mag24a (discovered GCN 36267, discussed GCN 36270,32674,32675,32676,32680); AT2024hdl, AT2024hdm, AT2024hdn, AT2024hdo, AT2024hdp, AT2024hdq (discovered GCN 36273, AT2024hdl observed GCN 36297, AT2024hdm observed GCN 36279, AT2024hdn observed GCN 36280,36281, AT2024hdo observed GCN 36296; all observed GCN 36282 and discussed GCN 36283,36289); S240422ed_X101 (GCN 36278, observed GCN36282, 36287, 36293). None of these sources are located our fields.\n\nWe monitored S240422ed_X190 (GCN 32678) on MJD:60423.4324 in R and MJD:60424.4343 V band; we did not detect any optical counterpart. The depth of our images in Gaia DR3 is R: 19.7 (5 sigma, Vega) and V: 17.9 (5 sigma, Vega).\n\nWe also monitored S240422ed_X61 on MJD:60424.4209 in Ic band; we did not detect any optical counterpart. The depth of our images in Gaia DR3 is Ic: 17.6 (5 sigma, Vega).\n\nWe can provide at any time, any image from this campaign by request.\n\nGRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics [2]. Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (kilonovacatcher.in2p3.fr).\n\n[1] Ducoin et al., arxiv.org/abs/1911.05432\n[2] Antier et al. 2020 MNRAS 497, 5518\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36299.",
"published": "2024-04-25T12:15:12.927114Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-25T12:15:12.927135Z",
"modified": "2024-04-25T12:15:12.935558Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 5397,
"topic": "gcn.circular",
"uuid": "430d95f0-6d4b-45bf-abbd-95447cb29d4e",
"title": "GRB 231216A: 10.4 m GTC optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/12/18 15:52:04 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35398"
},
"title": "GCN CIRCULAR",
"number": "35398",
"subject": "GRB 231216A: 10.4 m GTC optical upper limit"
},
"message_text": "Y.-D. Hu, R. Sanchez-Ramirez, A. J. Castro-Tirado, S. Guziy, M.D. Caballero-Garcia, S.-Y. Wu, E. Fernandez-Garcia, and I. Perez-Garcia (IAA-CSIC), F. Pérez-Toledo (GTC, IAC), S. B. Pandey (ARIES) and B.-B. Zhang (NJU) on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378), we triggered the 10.4m Gran Telescopio de Canarias (GTC) equipped with Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) in La Palma (Spain), starting on Dec 16, 20:18 UT (~1.7 h after the trigger). No optical afterglow is indentified within the refined Swift/XRT posiion (Sbarufatti et al. GCNC 35391) which down to i>24.5 mag, which is consistent with these reports from UVOT (Kuin et al., GCNC 35388), MASTER (Lipunov et al. GCNC 35379), NOT (Malesani et al. GCNC 35382), GIT (Sharma et al. GCNC 35383), T120 (Basa et al. GCNC 35384), REM (Ferro et al. GCNC 35389), AST-3 (Sun et al. GCNC 35390), Nastro Verde Observatory (Ruocco et al. GCNC 35394), LCOGT (Strausbaugh et al. GCNC 35395) and Nanshan/HMT (An et al. GCNC 35396).\n\nWe thank the staff at GTC for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35398.",
"published": "2023-12-18T15:52:16.623233Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-18T15:52:16.623249Z",
"modified": "2023-12-18T15:52:16.632068Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5398,
"topic": "gcn.circular",
"uuid": "9ed8168b-c319-413a-a67f-dcf87b835216",
"title": "GRB 231216A: optical upper limits from the INAF Asiago Observatory",
"submitter": "Hop gcn.circular",
"authors": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"data": {
"date": "23/12/18 16:58:09 GMT",
"from": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35399"
},
"title": "GCN CIRCULAR",
"number": "35399",
"subject": "GRB 231216A: optical upper limits from the INAF Asiago Observatory"
},
"message_text": "A. Reguitti (INAF-OAB / INAF-OAPd), P. D'Avanzo (INAF-OAB), I. Salmaso (INAF -OAPd), E. Cappellaro (INAF -OAPd),\nreport on behalf of the CIBO and of the GRAWITA collaborations:\n\n\nWe observed the field of GRB 231216A (Sbarrato et al., GCN Circ. 35378) from the INAF - Padova Astronomical Observatory\nlocated in Asiago (Italy) with the 1.8m Copernico telescope starting on 2023-12-16 at 20:24:48 UT (~ 1.8 hours after the burst).\nThe observations have been carried out with the AFOSC camera in imaging mode using the r filter.\n\nNo optical afterglow candidate is detected within the XRT error circle (Sbarufatti et al., GCN Circ .35391) down to a 3sigma\nlimiting magnitude of r ~ 22.0 (AB; calibrated against the PanSTARRS catalogue).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35399.",
"published": "2023-12-18T16:58:19.870874Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-18T16:58:19.870888Z",
"modified": "2023-12-18T16:58:19.877398Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5399,
"topic": "gcn.circular",
"uuid": "e118fc6e-4947-4309-91fd-b0e68acbee67",
"title": "GRB 231214B: Fermi GBM observation",
"submitter": "Hop gcn.circular",
"authors": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
"data": {
"date": "23/12/19 08:42:25 GMT",
"from": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35400"
},
"title": "GCN CIRCULAR",
"number": "35400",
"subject": "GRB 231214B: Fermi GBM observation"
},
"message_text": "E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\n\"At 07:53:55.52 UT on 14 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 231214B (trigger 724233240 / 231214329),\nwhich was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2023, GCN 35340).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 137.9, DEC = -13.4 (J2000 degrees,\nequivalent to 09h 11m 36, -13d 24'), with a statistical uncertainty\nof 6.3 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which we have characterized as a core-plus-tail model, with 90% of\nGRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg\nsystematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 78 degrees.\n\nThe GBM light curve shows a single weak and structured emission episode\nwith a duration (T90) of about 39 s (50-300 keV).\nThe time-averaged spectrum from T0-2 s to T0+39 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is 0.30 +/- 0.19 and\nthe cutoff energy, parameterized as Epeak, is 148 +/- 15 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.02 +/- 0.24)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0 in the 10-1000 keV band\nis 1.56 +/- 0.17 ph/s/cm^2.\n\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35400.",
"published": "2023-12-19T08:42:42.524228Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-19T08:42:42.524243Z",
"modified": "2023-12-19T08:42:42.531470Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5400,
"topic": "gcn.circular",
"uuid": "5f6d4b80-6dbf-4144-889b-122a2a4ab301",
"title": "GRB 231216A: GAD Observatory, La Spezia, Italy upper limit",
"submitter": "Hop gcn.circular",
"authors": "Claudio Lopresti <cl3lop@gmail.com>",
"data": {
"date": "23/12/19 11:33:18 GMT",
"from": "Claudio Lopresti <cl3lop@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35401"
},
"title": "GCN CIRCULAR",
"number": "35401",
"subject": "GRB 231216A: GAD Observatory, La Spezia, Italy upper limit"
},
"message_text": "Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy)\n\nMember of:\nUAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section.\nGAD - Gruppo Astronomia Digitale.\n\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy), B. De Simone (Universita' degli Studi Di Salerno), Unione Astrofili Italiani (UAI)\nreport:\n\nWe imaged the field of GRB 231216A detected by SWIFT(trigger 1202749)\nwith the telescope LX200 12â of GAD Observatory, La Spezia, Italy\n\nThe observations with a series of 60 sec exposures started at 2023-12-16 23:14:43 UT, 261 min. after the GRB trigger,with a Shmidt-Cassegrain telescope D=304 mm with reducer F/D=4.75.\nat the following position (+/- 2 arcsec):\n\nRA (J2000): 02 39 05.45\nDec(J2000): +33 34 35.0\nscope D=300 mm F/D=4.8.\n\nWeather conditions were medium.\n\nWe co-added 75 exposures of 60 sec each.\n\nStart T0+ End T0+ R lim\n261 min 341 min 18\n\nWe did not found any optical counterpart in 02 39 05.45 +33 34 35.0 position and in the error box of the XRT candidate.\nref.: T. Sbarrato et al. GCN 35378\n\nMagnitudes were estimated with the Gaia EDR3 cat. and\nare not corrected for galactic dust extinction.\n\nReference:\nhttps://www.parcodellestelle.com/\n\nThe message may be cited. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35401.",
"published": "2023-12-19T11:33:30.193383Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-19T11:33:30.193401Z",
"modified": "2023-12-19T11:33:30.218077Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6937,
"topic": "gcn.circular",
"uuid": "b48d5928-9e3c-4038-8919-04541b992cb6",
"title": "LIGO/Virgo/KAGRA S240422ed: Upper limits from GECAM Observations",
"submitter": "Hop gcn.circular",
"authors": "tanwj@ihep.ac.cn",
"data": {
"date": "24/04/25 12:36:16 GMT",
"from": "tanwj@ihep.ac.cn",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36300"
},
"title": "GCN CIRCULAR",
"number": "36300",
"subject": "LIGO/Virgo/KAGRA S240422ed: Upper limits from GECAM Observations"
},
"message_text": "Wen-Jun Tan, Ce Cai, Shao-Lin Xiong, Chen-Wei Wang, Wang-Chen Xue, Chao Zheng,\nHao-Xuan Guo, Wen-Long Zhang, Cheng-Kui Li, Xiao-Bo Li, Shu-Xu Yi, Ping Wang and Bing Li\nreport on behalf of the GECAM team:\n\nAt the event time 2024-04-22T21:35:13.417 (UTC) of S240422ed (GCN 36236), GECAM-C was observing normally and monitored the full localization region of this GW event, while GECAM-B detectros were turned off due to the power supply limitation. \n\nThe incident angle of GECAM-C GRD detectors is down to about 12 deg for the center region (reference location RA = 122.38°, Dec = -20°) of the probability sky map of this GW event. This small incident angle indicates a good detector sensitivity to this event.\n\nThere was no GECAM-C in-flight trigger around the event time of S240422ed. An automated, blind search for gamma-ray burst of GECAM-C data also found no burst candidates. Thus we implemented a targeted search [1] within +/-30 s around event time, and also identified no candidates.\n\nConsidering three typical GRB spectral models, three timescales and the reference location metioned above, the 3 sigma upper limits of the GRB energy flux (10 keV-2000 keV, in units of 10^-7 erg/s/cm^2) are reported below:\n\n\nTimescale (s) Soft Normal Hard\n0.1 2.18 4.15 10.26\n1 \t0.66 1.28 3.07\n10 \t0.20 0.40 0.97\n\nAssuming the median luminosity distance of 188 Mpc from the GW observation, we can further estimate the 3 sigma upper limits of the GRB istropic luminosity (1 keV-10 MeV, in units of 10^48 erg/s):\n\nTimescale (s) Soft Normal Hard\n0.1 \t1.36 2.17 11.70\n1 0.42 0.67 3.48\n10 0.13 0.21 1.15\n\nWe note that all these results are preliminary and refined analysis will be reported.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n[1] C. Cai et al. MNRAS 508, 3910â3920 (2021) https://doi.org/10.1093/mnras/stab2760\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36300.",
"published": "2024-04-25T12:36:34.181799Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-25T12:36:34.181814Z",
"modified": "2024-04-25T12:36:34.191196Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 6938,
"topic": "gcn.circular",
"uuid": "c3b7664c-5021-451a-938f-6b47d7ab16f9",
"title": "LIGO/Virgo/KAGRA S240422ed: X-ray Upper Limits from EP-FXT for the Potential Electromagnetic Counterparts Reported by Swift and DECam",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/25 13:26:26 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36301"
},
"title": "GCN CIRCULAR",
"number": "36301",
"subject": "LIGO/Virgo/KAGRA S240422ed: X-ray Upper Limits from EP-FXT for the Potential Electromagnetic Counterparts Reported by Swift and DECam"
},
"message_text": "\nC. K. Li (IHEP, CAS), C. C. Jin (NAOC, CAS), H. S. Zhao, M.Y. Ge, Y. Chen, S.M. Jia, W. W. Cui, J. Guan, H. Feng, W. Li, C. Z. Liu, F. J. Lu, L. M. Song, J. Wang, J. J. Xu, J. Zhang, D. W. Han, S. N. Zhang, X. F. Zhao (IHEP, CAS), H. Q. Cheng, J. W. Hu, Q. Y. Wu, H. Y. Liu, D. Y. Li, H. Sun, W. J. Zhang, H. N. Yang, Y. L. Wang, X. Pan, X. P. Xu, J. J. Jin, M. J. Liu, Y. Liu, Z. X. Ling, C. Zhang, M. H. Huang, H. W. Pan, Y. F. Xu, W. Yuan, M. Zhang(NAOC, CAS), Q. C. Shui(IHEP, CAS), A. Li(Beijing Normal Univ.), B. Zhang (UNLV), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau, P. Friedrich, N. Meidinger, V. Burwitz (MPE), B. Cordier (CEA), on behalf of the Einstein Probe team\n\nWe report on the X-ray upper limits from the ongoing observations of the Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission, for the potential electromagnetic counterparts reported by Swift (Evans et al. GCN 36278) and DECam (Hu et al. GCN 36273).\n\nThrough our preliminary analysis of the FXT data, we found no significant X-ray counterparts at the positions of these sources. The upper limits of the count rate are calculated using the method provided by Ruiz et al. 2022 [1]. Assuming an absorbed power-law model with a column density of 2 x 10^21 cm^-2 and a photon index of 2 (Zhang et al. 2022 [2]), the flux upper limits at the 90% confidence level are obtained, which is detailed as follows.\nSource | R.A | Dec. | Obs time |Exposure| FXTA Upper limit | FXTB Upper limit\n | | | | (s) | (erg/s/cm^2) | (erg/s/cm^2)\n--------------------------------------------------------------------------------------------------------------\nAT 2024hdk |130.625724|-15.59953| 2024-04-24T07:05:53 | 447 | 1.9 x 10^-13 | 2.0 x 10^-13\nAT 2024hdn |127.302473|-21.50639| 2024-04-24T07:24:02 | 515 | 1.3 x 10^-13 | 2.1 x 10^-13\nAT 2024hdm |126.65801 |-20.83375| 2024-04-24T07:15:58 | 434 | 1.1 x 10^-13 | 1.6 x 10^-13\nAT 2024hdl |125.47270 |-30.10220| 2024-04-24T07:43:56 | 509 | 1.3 x 10^-13 | 7.2 x 10^-14\nAT 2024hdo |120.866797|-26.01212| 2024-04-24T08:48:53 | 507 | 8.6 x 10^-14 | 1.1 x 10^-13\nAT 2024hdr* |120.804560|-24.33268| 2024-04-24T07:34:01 | 510 | 3.5 x 10^-12\nAT 2024hdp |120.543455|-27.25787| 2024-04-24T08:40:25 | 447 | 1.4 x 10^-13 | 1.6 x 10^-13\nAT 2024hdq* |115.811388|-25.76403| 2024-04-24T08:58:34 | 512 | 6.4 x 10^-12\nS240422ed_X61 |120.3245 |-28.1765 | 2024-04-24T10:41:07 | 4472 | 1.4 x 10^-14 | 1.7 x x10^-14\nS240422ed_X101 |122.3954 |-24.3272 | 2024-04-24T13:29:32 | 2946 | 1.8 x 10^-14 | 2.2 x 10^-14\nS240422ed_X190 |121.2770 |-26.1203 | 2024-04-24T09:22:15 | 574 | 7.6 x 10^-14 | 6.4 x 10^-14\n--------------------------------------------------------------------------------------------------------------\nNote: For AT 2024hdr and AT 2024hdq, which are reported to be unrelated to S240422ed (GCN 36285), the averaged flux of FXTA and FXTB is given.\n\nThe above observations were made with the FXT instrument during the commissioning phase of EP. 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\nReferences:\n[1] Ruiz, A., et al. \"The RapidXMM upper limit server: X-ray aperture photometry of the XMM-Newton archival observations.\" Monthly Notices of the Royal Astronomical Society 511.3 (2022): 4265-4284.\n[2] Zhang, Juan, et al. \"Estimate of the background and sensitivity of the follow-up X-ray telescope onboard Einstein Probe.\" Astroparticle Physics 137 (2022): 102668.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36301.",
"published": "2024-04-25T13:26:42.627009Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-25T13:26:42.627030Z",
"modified": "2024-04-25T13:26:42.637515Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 5401,
"topic": "gcn.circular",
"uuid": "d3240376-3a87-49cd-a8ba-1d1644262ada",
"title": "GRID detection of GRB 231205A",
"submitter": "Hop gcn.circular",
"authors": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"data": {
"date": "23/12/19 12:34:43 GMT",
"from": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35402"
},
"title": "GCN CIRCULAR",
"number": "35402",
"subject": "GRID detection of GRB 231205A"
},
"message_text": "Chenyu Wang, Zirui Yang, Longhao Li and Songyu Shen report on behalf of the GRID Collaboration:\n\nGRID-07 reports the detection of the short-duration GRB 231205A, which was also detected by Fermi/GBM and GECAM-B(GCN Circular 35263, 35266).\n\nThe event was triggered with GRID on 2023-12-05 at 02:25:11.2 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 0.4 ± 0.1 seconds.\n\nThe GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231205A/GRID_231205A_ltcv.pdf.\n\nGRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35402.",
"published": "2023-12-19T12:34:54.032007Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-19T12:34:54.032023Z",
"modified": "2023-12-19T12:34:54.042036Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5402,
"topic": "gcn.circular",
"uuid": "dbbe93d1-01b4-4e66-acb6-de84533b2b61",
"title": "GRID detection of GRB 231205B",
"submitter": "Hop gcn.circular",
"authors": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"data": {
"date": "23/12/19 12:35:19 GMT",
"from": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35403"
},
"title": "GCN CIRCULAR",
"number": "35403",
"subject": "GRID detection of GRB 231205B"
},
"message_text": "Chenyu Wang, Zirui Yang and Longhao Li report on behalf of the GRID Collaboration:\n\nGRID-03B and GRID-04, onboard the same CubeSat, report the detection of the long-duration GRB 231205B, which was also detected by Swift/BAT, GECAM-B, and AGILE(GCN Circular 35269, 35279, 35295).\n\nThe event was triggered with GRID on 2023-12-05 at 16:43:49 UTC. The GRID light curve shows a double-pulse temporal structure. The measured burst duration (T90) in the 30-2000 keV range is approximately 40.2 ± 3.0 seconds.\n\nThe GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231205B/GRID_231205B_ltcv.pdf.\n\nGRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35403.",
"published": "2023-12-19T12:35:27.179223Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-19T12:35:27.179238Z",
"modified": "2023-12-19T12:35:27.183994Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5403,
"topic": "gcn.circular",
"uuid": "055af6ab-8610-44b8-9ed5-2fd5c7cedad0",
"title": "GRB 231219A: 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": "23/12/19 17:22:54 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35404"
},
"title": "GCN CIRCULAR",
"number": "35404",
"subject": "GRB 231219A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 17:12:22 UT on 19 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231219A (trigger 724698747.778088 / 231219717).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 231.6, Dec = 58.0 (J2000 degrees, equivalent to J2000 15h 26m, 58d 00'), with a statistical uncertainty of 14.2 degrees.\n\nThe angle from the Fermi LAT boresight is 21.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231219717/quicklook/glg_skymap_all_bn231219717.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/bn231219717/quicklook/glg_healpix_all_bn231219717.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231219717/quicklook/glg_lc_medres34_bn231219717.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35404.",
"published": "2023-12-19T17:23:07.919851Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-19T17:23:07.919869Z",
"modified": "2023-12-19T17:23:07.927660Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5404,
"topic": "gcn.circular",
"uuid": "e3bc60bb-a249-4d96-9dae-ec43eeb357e9",
"title": "Fermi trigger No 724698747: 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": "23/12/19 20:30:38 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35405"
},
"title": "GCN CIRCULAR",
"number": "35405",
"subject": "Fermi trigger No 724698747: 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-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 GRB231219.72 (trigger No 724698747,15h 26m 33.60s , +58d 00m 00.0s, R\u0014.25) errorbox 10878 sec after notice time and 10910 sec after trigger time at 2023-12-19 20:14:13 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 80 deg. The sun altitude is -63.0 deg.\n\nMASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB231219.72 errorbox 11399 sec after notice time and 11431 sec after trigger time at 2023-12-19 20:22:53 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 62 deg. The sun altitude is -43.0 deg.\n\nThe galactic latitude b = 49 deg., longitude l = 92 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#37422\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 10940 | 2023-12-19 20:14:13 | MASTER-Tavrida | (16h 53m 20.35s , +56d 06m 31.3s) | C | 60 | 16.5 |\n 11461 | 2023-12-19 20:22:53 | MASTER-Tunka | (17h 13m 36.54s , +56d 07m 11.7s) | C | 60 | 18.5 |\nFilter C is a clear (unfiltred) band.\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/35405.",
"published": "2023-12-19T20:30:49.993677Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-19T20:30:49.993694Z",
"modified": "2023-12-19T20:30:50.013384Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5421,
"topic": "gcn.circular",
"uuid": "3ecfe703-06a0-417e-bb02-e99b08c1e8a5",
"title": "Fermi trigger No 724781422: 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": "23/12/20 17:46:09 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35408"
},
"title": "GCN CIRCULAR",
"number": "35408",
"subject": "Fermi trigger No 724781422: 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-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 GRB231220.67 (trigger No 724781422,04h 53m 28.80s , +82d 17m 24.0s, R=5.04) errorbox 47 sec after notice time and 81 sec after trigger time at 2023-12-20 16:11:39 UT, with upper limit up to 19.6 mag. The observations began at zenith distance = 31 deg. The sun altitude is -60.6 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231220.67 errorbox 111 sec after notice time and 146 sec after trigger time at 2023-12-20 16:12:43 UT, with upper limit up to 19.6 mag. The observations began at zenith distance = 44 deg. The sun altitude is -27.3 deg.\n\nThe galactic latitude b = 23 deg., longitude l = 130 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#38295\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 92 | 2023-12-20 16:11:39 | MASTER-Tunka | (04h 50m 37.99s , +82d 29m 18.3s) | C | 20 | 18.9 |\n 117 | 2023-12-20 16:11:39 | MASTER-Tunka | (04h 50m 37.99s , +82d 29m 18.3s) | C | 70 | 19.6 | Coadd\n 177 | 2023-12-20 16:11:39 | MASTER-Tunka | (04h 50m 38.02s , +82d 29m 18.3s) | C | 190 | 19.5 | Coadd\n 116 | 2023-12-20 16:12:03 | MASTER-Tunka | (04h 50m 37.58s , +82d 29m 18.9s) | C | 20 | 19.0 |\n 145 | 2023-12-20 16:12:27 | MASTER-Tunka | (04h 50m 37.01s , +82d 29m 20.5s) | C | 30 | 19.2 |\n 161 | 2023-12-20 16:12:43 | MASTER-Kislovodsk | (05h 23m 52.17s , +82d 05m 38.2s) | C | 30 | 18.4 |\n 206 | 2023-12-20 16:12:43 | MASTER-Kislovodsk | (05h 23m 52.18s , +82d 05m 38.2s) | C | 120 | 19.4 | Coadd\n 391 | 2023-12-20 16:12:43 | MASTER-Kislovodsk | (05h 23m 52.15s , +82d 05m 38.2s) | C | 490 | 19.4 | Coadd\n 179 | 2023-12-20 16:13:00 | MASTER-Tunka | (04h 50m 36.68s , +82d 29m 21.6s) | C | 30 | 19.2 |\n 224 | 2023-12-20 16:13:00 | MASTER-Tunka | (04h 50m 36.71s , +82d 29m 21.6s) | C | 120 | 19.1 | Coadd\n 216 | 2023-12-20 16:13:33 | MASTER-Kislovodsk | (05h 23m 55.20s , +82d 06m 40.5s) | C | 40 | 18.8 |\n 218 | 2023-12-20 16:13:34 | MASTER-Tunka | (04h 50m 35.94s , +82d 29m 23.3s) | C | 40 | 18.3 |\n 266 | 2023-12-20 16:14:18 | MASTER-Tunka | (04h 50m 35.30s , +82d 29m 25.3s) | C | 50 | 18.4 |\n 283 | 2023-12-20 16:14:35 | MASTER-Kislovodsk | (05h 23m 57.88s , +82d 05m 45.2s) | C | 50 | 19.0 |\n 326 | 2023-12-20 16:15:13 | MASTER-Tunka | (04h 50m 34.17s , +82d 29m 28.2s) | C | 60 | 18.5 |\n 386 | 2023-12-20 16:15:13 | MASTER-Tunka | (04h 50m 34.19s , +82d 29m 28.2s) | C | 180 | 12.4 | Coadd\n 360 | 2023-12-20 16:15:47 | MASTER-Kislovodsk | (05h 23m 49.33s , +82d 04m 49.1s) | C | 60 | 19.0 |\n 515 | 2023-12-20 16:15:47 | MASTER-Kislovodsk | (05h 23m 49.29s , +82d 04m 49.1s) | C | 370 | 19.6 | Coadd\n 390 | 2023-12-20 16:16:16 | MASTER-Tunka | (04h 50m 33.23s , +82d 29m 30.4s) | C | 60 | 18.5 |\n 599 | 2023-12-20 16:19:46 | MASTER-Tunka | (04h 49m 16.45s , +82d 24m 30.5s) | C | 60 | 18.6 |\n 663 | 2023-12-20 16:20:50 | MASTER-Tunka | (04h 49m 15.45s , +82d 24m 32.6s) | C | 60 | 18.8 |\n 723 | 2023-12-20 16:20:50 | MASTER-Tunka | (04h 49m 15.47s , +82d 24m 32.5s) | C | 180 | 19.3 | Coadd\n 727 | 2023-12-20 16:21:54 | MASTER-Tunka | (04h 49m 14.41s , +82d 24m 34.9s) | C | 60 | 18.8 |\n 777 | 2023-12-20 16:22:04 | MASTER-Kislovodsk | (05h 22m 17.38s , +81d 58m 31.2s) | C | 140 | 19.2 |\n 791 | 2023-12-20 16:22:58 | MASTER-Tunka | (04h 49m 13.31s , +82d 24m 37.6s) | C | 60 | 18.8 |\n 953 | 2023-12-20 16:24:45 | MASTER-Kislovodsk | (05h 22m 25.64s , +81d 59m 51.5s) | C | 170 | 19.3 |\n 1149 | 2023-12-20 16:27:56 | MASTER-Kislovodsk | (05h 22m 17.42s , +81d 59m 23.7s) | C | 180 | 19.4 |\n 1291 | 2023-12-20 16:31:18 | MASTER-Kislovodsk | (04h 54m 53.65s , +82d 03m 55.3s) | C | 60 | 15.0 |\n 2595 | 2023-12-20 16:53:02 | MASTER-Kislovodsk | (04h 36m 40.50s , +82d 37m 42.1s) | C | 60 | 18.4 |\n 2675 | 2023-12-20 16:54:22 | MASTER-Kislovodsk | (06h 40m 35.82s , +82d 35m 35.2s) | C | 60 | 18.5 |\n 2757 | 2023-12-20 16:55:44 | MASTER-Kislovodsk | (06h 17m 17.19s , +84d 28m 19.6s) | C | 60 | 18.6 |\n 2839 | 2023-12-20 16:57:05 | MASTER-Kislovodsk | (05h 42m 20.32s , +78d 51m 06.7s) | C | 60 | 18.8 |\n 2921 | 2023-12-20 16:58:28 | MASTER-Kislovodsk | (05h 42m 52.38s , +78d 51m 07.7s) | C | 60 | 14.8 |\n 3001 | 2023-12-20 16:59:48 | MASTER-Kislovodsk | (05h 44m 09.29s , +78d 51m 11.1s) | C | 60 | 14.8 |\n 3082 | 2023-12-20 17:01:09 | MASTER-Kislovodsk | (03h 38m 32.79s , +80d 46m 42.5s) | C | 60 | 18.5 |\n 3163 | 2023-12-20 17:02:29 | MASTER-Kislovodsk | (03h 28m 26.96s , +84d 34m 57.7s) | C | 60 | 18.6 |\n 3244 | 2023-12-20 17:03:51 | MASTER-Kislovodsk | (05h 26m 07.87s , +86d 21m 38.1s) | C | 60 | 18.7 |\n 3324 | 2023-12-20 17:05:11 | MASTER-Kislovodsk | (07h 02m 56.70s , +78d 48m 04.5s) | C | 60 | 18.6 |\n 3406 | 2023-12-20 17:06:32 | MASTER-Kislovodsk | (04h 51m 59.60s , +76d 58m 32.8s) | C | 60 | 18.6 |\n 4959 | 2023-12-20 17:32:26 | MASTER-Kislovodsk | (05h 16m 05.81s , +80d 44m 30.6s) | C | 60 | 18.7 |\n 5040 | 2023-12-20 17:33:47 | MASTER-Kislovodsk | (04h 36m 36.25s , +82d 40m 42.7s) | C | 60 | 18.5 |\nFilter C is a clear (unfiltred) band.\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/35408.",
"published": "2023-12-20T17:46:20.649280Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-20T17:46:20.649295Z",
"modified": "2023-12-20T17:46:20.654843Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6500,
"topic": "gcn.circular",
"uuid": "7d5cbcd3-7dbd-4531-a593-f884ea98b461",
"title": "GRB 240411B: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/12 16:36:29 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36071"
},
"title": "GCN CIRCULAR",
"number": "36071",
"subject": "GRB 240411B: Swift-XRT refined Analysis"
},
"message_text": "P. D'Avanzo (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A.\nKennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U.\nLeicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) and\nP.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 3.9 ks of XRT data for GRB 240411B, from 160 s to 74.6\nks after the BAT trigger. The data comprise 10 s in Windowed Timing\n(WT) mode (taken while Swift was slewing), with the remainder in Photon\nCounting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=0.66 (+0.12, -0.11).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.13 (+0.38, -0.20). The\nbest-fitting absorption column is consistent with the Galactic value\nof 1.1 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 3.2 x 10^-11 (4.1 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.1 (+/-1.0) x 10^21 cm^-2\nGalactic foreground: 1.1 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 2.13 (+0.38, -0.20)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01221183.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36071.",
"published": "2024-04-12T16:36:44.476664Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T16:36:44.476679Z",
"modified": "2024-04-12T16:36:44.485250Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5424,
"topic": "gcn.circular",
"uuid": "0fcb4f1b-1ddb-4874-ac01-5e700b77a458",
"title": "GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/12/20 22:09:23 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35409"
},
"title": "GCN CIRCULAR",
"number": "35409",
"subject": "GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst"
},
"message_text": "Samuele Ronchini (PSU), James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 231220A onboard (T0: 2023-12-20T16:10:17.4 UTC, Fermi/GBM GCN 35407).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). \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\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), detects the burst in a 4.096 s analysis time bin with a sqrt(TS) of 28.32, starting at T0 - 1.02 s.\nAn arcminute localization is found with DeltaLLHOut of 48.29 and a DeltaLLHPeak of 49.13.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretations of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nThe BAT position is\nRA, Dec = 27.321, 77.897 deg which is\n RA(J2000) = 01h 49m 17.04s\n Dec(J2000) = +77d 53â² 49.2â³\nwith an estimated uncertainty of 5 arcmin radius.\n\nXRT and UVOT follow-up has been requested.\nResults of follow-up observations will be reported in future circulars.\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35409.",
"published": "2023-12-20T22:09:33.587524Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-20T22:09:33.587542Z",
"modified": "2023-12-20T22:09:33.596809Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5425,
"topic": "gcn.circular",
"uuid": "15c72253-cc33-475e-8de0-db3bcc7ec30e",
"title": "GRB 231220A: Swift ToO observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/20 23:38:36 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35410"
},
"title": "GCN CIRCULAR",
"number": "35410",
"subject": "GRB 231220A: Swift ToO observations"
},
"message_text": "P. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a ToO observation of the GUANO GRB 231220A.\nAutomated analysis of the XRT data will be presented online at\nhttps://www.swift.ac.uk/ToO_GRBs/00021638\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. These are\nnot necessarily related to the GUANO event. Any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a\nGCN Circular after manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35410.",
"published": "2023-12-20T23:38:46.738817Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-20T23:38:46.738835Z",
"modified": "2023-12-20T23:38:46.747662Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6501,
"topic": "gcn.circular",
"uuid": "cf88d484-a2c8-41ee-baea-a0bea7872dc2",
"title": "GRB 240411B: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
"data": {
"date": "24/04/12 17:35:46 GMT",
"from": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36072"
},
"title": "GCN CIRCULAR",
"number": "36072",
"subject": "GRB 240411B: Swift-BAT refined analysis"
},
"message_text": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nC. B. Markwardt (GSFC), M. J. Moss (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC),\nT. Sakamoto (AGU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 240411B (trigger #1221183)\n(Parsotan, et al., GCN Circ. 36063). The BAT ground-calculated position is\nRA, Dec = 231.562, -2.172 deg which is\n RA(J2000) = 15h 26m 14.8s\n Dec(J2000) = -02d 10' 20.9\"\nwith an uncertainty of 3.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 53%.\n\nThe mask-weighted light curve shows two spikes separated by an interval of ~15 seconds.\nThe estimated T90 (15-350 keV) is 33.26 +- 1.49 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.37 to T+33.92 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.69 +- 0.41. The fluence in the 15-150 keV band is 4.9 +- 1.2 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+32.87 sec in the 15-150 keV band\nis 0.9 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1221183\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36072.",
"published": "2024-04-12T17:36:00.205376Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T17:36:00.205394Z",
"modified": "2024-04-12T17:36:00.217792Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6502,
"topic": "gcn.circular",
"uuid": "147ecb16-6683-4bc6-93dd-6669b696d98e",
"title": "IceCube Alert 240412.23: 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": "24/04/12 17:39:29 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36073"
},
"title": "GCN CIRCULAR",
"number": "36073",
"subject": "IceCube Alert 240412.23: 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 IceCube Alert 240412.23 (trigger No 10803235,06h 55m 08.64s , +05d 52m 19.2s, R=1.15) errorbox 40744 sec after notice time and 40796 sec after trigger time at 2024-04-12 16:53:43 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 47 deg. The sun altitude is -11.9 deg.\n\nThe galactic latitude b = 4 deg., longitude l = 208 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$19799\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 40886 | 2024-04-12 16:53:43 | MASTER-Kislovodsk | (06h 55m 36.89s , +05d 54m 23.4s) | C | 180 | 17.3 |\n 40886 | 2024-04-12 16:53:43 | MASTER-Kislovodsk | (06h 51m 27.09s , +06d 15m 59.5s) | C | 180 | 17.9 |\n 41027 | 2024-04-12 16:57:03 | MASTER-Kislovodsk | (06h 52m 33.46s , +05d 02m 23.9s) | C | 60 | 16.3 |\n 41027 | 2024-04-12 16:57:03 | MASTER-Kislovodsk | (06h 48m 24.53s , +05d 23m 56.6s) | 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36073.",
"published": "2024-04-12T17:39:39.468840Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T17:39:39.468853Z",
"modified": "2024-04-12T17:39:39.477873Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5444,
"topic": "gcn.circular",
"uuid": "b8cdfe77-ab05-4a26-aa8f-3e08c8b33006",
"title": "GRB 231220A: Swift-XRT follow-up observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/21 15:25:45 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35411"
},
"title": "GCN CIRCULAR",
"number": "35411",
"subject": "GRB 231220A: Swift-XRT follow-up observations"
},
"message_text": "C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB), S. Dichiara (PSU), J.A.\nKennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester),\nK.L. Page (U. Leicester), R. Brivio (INAF-OAB) and P.A. Evans (U.\nLeicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the GUANO-detected\nburst GRB 231220A, collecting 3.6 ks of Photon Counting (PC) mode data\nbetween T0+27.0 ks and T0+39.5 ks. \n\nNo candidate counterpart was detected, with an upper limit of \n2.2Ã10-3 ct s-1 at the best BAT position (GCN 35409). \n\nOne uncatalogued X-ray source was flagged as spurious \nafter manual inspection. \n\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021638.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35411.",
"published": "2023-12-21T15:26:01.149403Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-21T15:26:01.149560Z",
"modified": "2023-12-21T15:26:01.157634Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5456,
"topic": "gcn.circular",
"uuid": "6d0de49e-79b5-40b2-9dc9-01621799f27c",
"title": "GRB 231222A: 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": "23/12/22 07:20:32 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35412"
},
"title": "GCN CIRCULAR",
"number": "35412",
"subject": "GRB 231222A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 07:09:54 UT on 22 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231222A (trigger 724921799.613468 / 231222299).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 161.4, Dec = -36.0 (J2000 degrees, equivalent to J2000 10h 45m, -36d 00'), with a statistical uncertainty of 1.2 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/2023/bn231222299/quicklook/glg_skymap_all_bn231222299.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/bn231222299/quicklook/glg_healpix_all_bn231222299.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231222299/quicklook/glg_lc_medres34_bn231222299.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35412.",
"published": "2023-12-22T07:20:46.617838Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-22T07:20:46.617865Z",
"modified": "2023-12-22T07:20:46.627577Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5457,
"topic": "gcn.circular",
"uuid": "79eb7b34-e262-4c6d-a427-c22e6aabe54a",
"title": "GRID detection of GRB 231215A",
"submitter": "Hop gcn.circular",
"authors": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"data": {
"date": "23/12/22 09:12:33 GMT",
"from": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35413"
},
"title": "GCN CIRCULAR",
"number": "35413",
"subject": "GRID detection of GRB 231215A"
},
"message_text": "Chenyu Wang, Zirui Yang and Longhao Li report on behalf of the GRID Collaboration:\n\nGRID-04 reports the detection of the long-duration GRB 231215A, which was also detected by Swift/BAT, AstroSat CZTI, AGILE, Fermi/GBM, Konus-Wind and GRBAlpha(GCN Circular 35343, 35352, 35361, 35369, 35377 and 35380).\n\nThe event was triggered with GRID on 2023-12-15 at 09:47:18.5 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 17.0 ± 1.5 seconds.\n\nThe time-averaged spectrum of GRID-04 realtime data from T+0 to T+18 sec is best fit by a cutoff power-law model. The index of the time-averaged spectrum is -0.576(-0.108,+0.114) with a fluence in the 10-1000 keV band is about 5.2488E-05 erg/cm2. All the quoted errors are at the 1-sigma confidence level.\n\nThe GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231215A/GRID_231215A_ltcv.pdf. The GRID spectrum of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231215A/GRID_231215A_spec_pl.pdf.\n\nGRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35413.",
"published": "2023-12-22T09:12:46.883739Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-22T09:12:46.883757Z",
"modified": "2023-12-22T09:12:46.891128Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5466,
"topic": "gcn.circular",
"uuid": "581db751-55b0-4541-97e0-9edeef1b8840",
"title": "IceCube-231211A: GRANDMA observations of PKS2047+098",
"submitter": "Hop gcn.circular",
"authors": "Thierry Pradier at IPHC/University of Strasbourg <tpradier@km3net.de>",
"data": {
"date": "23/12/22 17:06:57 GMT",
"from": "Thierry Pradier at IPHC/University of Strasbourg <tpradier@km3net.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35414"
},
"title": "GCN CIRCULAR",
"number": "35414",
"subject": "IceCube-231211A: GRANDMA observations of PKS2047+098"
},
"message_text": "M. Prouza, S. Karpov, M. Mašek (FZU), C. Andrade (UMN), S. Antier (OCA/Artemis), M. Coughlin (UMN), P.A. Duverne (APC), P. Hello (IJCLAB), I. Tosta e Melo (UniCT-DFA), T. Pradier (Unistra/IPHC), D. Turpin (CEA),\nreport on behalf of the GRANDMA collaboration:\n\nWe observed the field of PKS2047+098 after the detection of 2 IceCube high-energy neutrino candidates (GCN 35328, 35332), and the report of an increased gamma-ray activity for this Blazar by Fermi-LAT (GCN 35329). Master-Net reported upper limits for the considered errorbox soon after the IceCube alert (GCN 35321).\n\nImaging with FRAM-CTA-N telescope of the GRANDMA collaboration in the r- and v-bands, we obtained R > 18.3 and V > 18.6 (5 sigma) on 2023-12-14T20:11:42 and 2023-12-14T20:13:20 with 19x90s exposure.\n\nFollowup will continue in the forthcoming weeks.\n\nGRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35414.",
"published": "2023-12-22T17:07:13.846412Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-22T17:07:13.846427Z",
"modified": "2023-12-22T17:07:13.853681Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6939,
"topic": "gcn.circular",
"uuid": "29888849-f3e0-4aaf-90c0-fa07b4fa3180",
"title": "LIGO/Virgo/KAGRA S240422ed: Further near-infrared observations with Subaru/MOIRCS by J-GEM Collaboration",
"submitter": "Hop gcn.circular",
"authors": "Tomoki Morokuma at Chiba Institute of Technology <tomoki.morokuma@p.chibakoudai.jp>",
"data": {
"date": "24/04/25 14:19:57 GMT",
"from": "Tomoki Morokuma at Chiba Institute of Technology <tomoki.morokuma@p.chibakoudai.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36302"
},
"title": "GCN CIRCULAR",
"number": "36302",
"subject": "LIGO/Virgo/KAGRA S240422ed: Further near-infrared observations with Subaru/MOIRCS by J-GEM Collaboration"
},
"message_text": "Tomoki Morokuma (ARC/Chitech), Nozomu Tominaga, Kenshi Yanagisawa, Ichi Tanaka, Michitoshi Yoshida (NAOJ), Kazuya Matsubayashi (U. of Tokyo), Hiroshi Akitaya (ARC/Chitech), Ryusei Hamada, Daisuke Suzuki (Osaka U), Narikazu Higuchi, Mahito Sasada, Hibiki Seki, Ichiro Takahashi, Shigeaki Joshima, Haruna Hagio, Yoshiyuki Kubo (Tokyo Tech), Satoshi Honda, Jun Takahashi, Tomohito Ohshima (Univ. of Hyogo/NHAO), Koji Kawabata, Tatsuya Nakaoka (Hiroshima U.), Ryosuke Itoh (Ibara City), Mitsuru Kokubo, Natsuki Hayatsu, Hidekazu Hanayama (NAOJ), Takahiro Kanai, Yumiko Oasa (Saitama Univ.), Katsuhiro L. Murata, Kenta Taguchi, Kouji Ohta, Miho Kawabata, Keiichi Maeda (Kyoto U.), Takayoshi Kusune (Nagoya University), Yuu Niino (U. of Tokyo), Yuichiro Sekiguchi (Toho University), Masaomi Tanaka (Tohoku University), Yousuke Utsumi (SLAC) report on behalf of Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up (J-GEM) collaboration:\n\nWe conducted near-infrared (Y and Ks bands) imaging observations of 105 GLADE galaxies (Dalya, G. et al. 2018, MNRAS, 479, 2374) in the localization region of the gravitational wave event LIGO/Virgo/KAGRA S240422ed (GCN 36236) using the Multi-Object InfraRed Camera and Spectrograph (MOIRCS; 3.9x6.9 arcmin^2 field-of-view; Suzuki, R. et al. 2008, PASJ, 60, 1347; Ichikawa, T. et al. 2006, SPIE, 6269, 38) on the 8.2-m Subaru telescope. We started our observations at UT 2024-04-24 05:18, about 31.7 hours after the event. Most of these 105 GLADE galaxies were not observed with Subaru/MOIRCS on UT 2024-04-23 (GCN 36265). The list of the observed galaxies is shown in the table below. We also took Y and Ks band images for transient candidates reported in GCN 36263, 36267, and 36273. The exposure times are 15 and 15-20 seconds in Y and Ks bands, respectively.\nThe data were reduced with the MCSRED (Tanaka, I. et al. 2011, PASJ, 63, S415) and detailed examination of the obtained data is now underway.\n\nObserved galaxies\nGL075344-262712 07:53:43.70 -26:27:11.52\nGL075736-263533 07:57:36.00 -26:35:32.64\nGL075745-312020 07:57:44.76 -31:20:20.40\nGL075900-241119 07:58:59.20 -24:11:18.96\nGL075906-305442 07:59:05.71 -30:54:42.12\nGL075951-284307 07:59:50.97 -28:43:07.32\nGL080004-274149 08:00:04.10 -27:41:49.20\nGL080019-244809 08:00:18.96 -24:48:08.64\nGL080037-262017 08:00:37.20 -26:20:16.80\nGL080121-325937 08:01:21.45 -32:59:37.32\nGL080138-294027 08:01:38.30 -29:40:26.40\nGL080156-232917 08:01:55.84 -23:29:17.52\nGL080231-224547 08:02:30.62 -22:45:46.80\nGL080305-224100 08:03:05.44 -22:41:00.24\nGL080332-223418 08:03:31.72 -22:34:18.12\nGL080426-380023 08:04:25.77 -38:00:22.68\nGL080444-313845 08:04:44.35 -31:38:45.24\nGL080513-281754 08:05:13.36 -28:17:54.24\nGL080531-224000 08:05:30.93 -22:40:00.48\nGL080604-222712 08:06:04.29 -22:27:12.24\nGL080615-312154 08:06:14.71 -31:21:54.36\nGL080630-342242 08:06:29.73 -34:22:41.88\nGL080635-251122 08:06:34.99 -25:11:22.20\nGL080640-305102 08:06:39.74 -30:51:01.80\nGL080714-315729 08:07:13.56 -31:57:29.52\nGL080720-293536 08:07:20.01 -29:35:36.60\nGL080720-244703 08:07:20.28 -24:47:03.48\nGL080847-305655 08:08:46.96 -30:56:55.32\nGL080850-243120 08:08:49.87 -24:31:20.28\nGL080912-243444 08:09:12.36 -24:34:44.04\nGL080938-303917 08:09:38.20 -30:39:17.28\nGL081000-202700 08:09:59.73 -20:26:59.64\nGL081024-302051 08:10:24.12 -30:20:50.64\nGL081135-314704 08:11:35.18 -31:47:04.20\nGL081135-240855 08:11:35.40 -24:08:55.32\nGL081137-290405 08:11:37.39 -29:04:05.16\nGL081145-340542 08:11:45.12 -34:05:42.00\nGL081200-243339 08:11:59.20 -24:33:38.52\nGL081205-312547 08:12:04.63 -31:25:47.28\nGL081206-292357 08:12:06.28 -29:23:56.76\nGL081214-290821 08:12:14.01 -29:08:20.76\nGL081225-271157 08:12:25.05 -27:11:57.48\nGL081239-315224 08:12:38.66 -31:52:24.24\nGL081311-310427 08:13:11.13 -31:04:26.40\nGL081312-280235 08:13:11.52 -28:02:34.44\nGL081317-262020 08:13:17.06 -26:20:19.68\nGL081330-204609 08:13:29.92 -20:46:09.12\nGL081340-211703 08:13:40.00 -21:17:03.12\nGL081351-323922 08:13:51.43 -32:39:21.60\nGL081401-243845 08:14:00.98 -24:38:44.52\nGL081406-262747 08:14:05.64 -26:27:46.44\nGL081417-311627 08:14:17.49 -31:16:27.12\nGL081435-331123 08:14:35.20 -33:11:22.92\nGL081438-331902 08:14:37.60 -33:19:01.92\nGL081451-342315 08:14:50.52 -34:23:14.64\nGL081456-331857 08:14:55.56 -33:18:56.88\nGL081503-331523 08:15:02.97 -33:15:22.68\nGL081506-300753 08:15:05.83 -30:07:52.68\nGL081550-311104 08:15:50.08 -31:11:04.20\nGL081623-233218 08:16:23.44 -23:32:17.88\nGL081651-314535 08:16:50.64 -31:45:35.28\nGL081659-233123 08:16:58.87 -23:31:22.80\nGL081727-275926 08:17:27.40 -27:59:25.80\nGL081728-315121 08:17:28.44 -31:51:20.88\nGL081729-222931 08:17:29.35 -22:29:30.84\nGL081743-203614 08:17:42.55 -20:36:14.04\nGL081756-324248 08:17:55.94 -32:42:48.24\nGL081801-161400 08:18:00.60 -16:13:59.88\nGL081827-260446 08:18:27.02 -26:04:46.20\nGL081840-285532 08:18:40.41 -28:55:32.16\nGL081842-263441 08:18:42.33 -26:34:41.16\nGL081843-334427 08:18:43.27 -33:44:27.24\nGL081854-324543 08:18:54.19 -32:45:43.20\nGL081904-301803 08:19:03.62 -30:18:03.24\nGL081905-310416 08:19:04.94 -31:04:16.32\nGL081907-255038 08:19:07.29 -25:50:38.04\nGL081908-301502 08:19:08.25 -30:15:02.16\nGL081925-331610 08:19:24.88 -33:16:09.84\nGL081943-322328 08:19:43.00 -32:23:27.96\nGL081952-211319 08:19:51.79 -21:13:19.20\nGL082000-211900 08:19:59.08 -21:19:00.12\nGL082008-195842 08:20:07.75 -19:58:41.88\nGL082009-210955 08:20:09.04 -21:09:54.72\nGL082029-183327 08:20:29.08 -18:33:26.64\nGL082051-284958 08:20:50.66 -28:49:58.08\nGL082110-181309 08:21:10.20 -18:13:08.76\nGL082115-281904 08:21:15.02 -28:19:03.72\nGL082117-315346 08:21:16.77 -31:53:45.96\nGL082204-201701 08:22:03.64 -20:17:00.96\nGL082208-254244 08:22:07.58 -25:42:44.28\nGL082214-204154 08:22:14.35 -20:41:54.24\nGL082220-205627 08:22:19.75 -20:56:27.24\nGL082220-285220 08:22:19.96 -28:52:20.28\nGL082242-324040 08:22:42.26 -32:40:39.72\nGL082249-294256 08:22:49.34 -29:42:55.80\nGL082314-253706 08:23:14.28 -25:37:05.52\nGL082354-271106 08:23:54.16 -27:11:06.36\nGL082416-315147 08:24:16.39 -31:51:47.52\nGL082551-261311 08:25:50.68 -26:13:10.56\nGL082619-205052 08:26:19.20 -20:50:52.08\nGL082658-155219 08:26:58.41 -15:52:18.84\nGL082731-175525 08:27:30.91 -17:55:25.32\nGL082744-210647 08:27:44.37 -21:06:47.16\nGL082847-274313 08:28:47.32 -27:43:12.36\nGL083041-194242 08:30:40.84 -19:42:42.48\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36302.",
"published": "2024-04-25T14:20:17.524482Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-25T14:20:17.524512Z",
"modified": "2024-04-25T14:20:17.537173Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 5496,
"topic": "gcn.circular",
"uuid": "70803568-e36a-4c3b-84b5-cbaeb9454b15",
"title": "GRB 231222B: Swift-XRT afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/23 12:50:08 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35421"
},
"title": "GCN CIRCULAR",
"number": "35421",
"subject": "GRB 231222B: Swift-XRT afterglow detection"
},
"message_text": "M. Ferro (INAF-OAB), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto),\nD.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.\nLeicester), A.P. Beardmore (U. Leicester), R. Brivio (INAF-OAB), A.\nD'Ai (INAF-IASFPA) and P.A. Evans (U. Leicester) reports on behalf of\nthe Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 231222B in a series of observations tiled\non the sky. We point out that the burst was improperly named GRB\n231222A in GCN Circ 35415, where the tiling was announced. The total\nexposure time is 4.1 ks, distributed over 4 tiles; the maximum exposure\nat a single sky location was 2.3 ks. The data were collected between\nT0+43.2 ks and T0+54.8 ks, and are entirely in Photon Counting (PC)\nmode.\n\nThree uncatalogued X-ray sources are detected, of which one (\"Source\n1\") is believed to be the afterglow. Using 1211 s of PC mode data and 1\nUVOT image, we find an enhanced XRT position (using the XRT-UVOT\nalignment and matching UVOT field sources to the USNO-B1 catalogue):\nRA, Dec = 251.24744, +19.62084 which is equivalent to:\n\nRA (J2000): 16h 44m 59.39s\nDec(J2000): +19d 37' 15.0\"\n\nwith an uncertainty of 3.3 arcsec (radius, 90% confidence). This\nposition is 9.3 arcmin from the Fermi/LAT position. The source has a\nmean count rate of 6.0e-02 ct/sec; we cannot determine at the present\ntime whether it is fading.\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.65 (+0.49, -0.29). The\nbest-fitting absorption column is consistent with the Galactic value\nof 7.1 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 3.4 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 7 (+/-14) x 10^20 cm^-2\nGalactic foreground: 7.1 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.65 (+0.49, -0.29)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021639.\nThe results of the full analysis of the tiled XRT observations are\navailable at https://www.swift.ac.uk/xrt_products/TILED_GRB00118.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35421.",
"published": "2023-12-23T12:50:19.607559Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-23T12:50:19.607574Z",
"modified": "2023-12-23T12:50:19.612654Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5471,
"topic": "gcn.circular",
"uuid": "fa6291aa-791e-4fee-91b2-c3f14ece77f9",
"title": "GRB 231222A: Tiled Swift observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/22 19:25:08 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35415"
},
"title": "GCN CIRCULAR",
"number": "35415",
"subject": "GRB 231222A: Tiled Swift observations"
},
"message_text": "\nP. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a series of observations, tiled on the sky, of the\nFermi/LAT GRB 231222A. Automated analysis of the XRT data will\nbe presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00118\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. The probability of finding\nserendipitous sources, unrelated to the Fermi/LAT event is high: any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a GCN Circular\nafter manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35415.",
"published": "2023-12-22T19:25:18.778694Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-22T19:25:18.778711Z",
"modified": "2023-12-22T19:25:18.785540Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5472,
"topic": "gcn.circular",
"uuid": "7a550a35-6d09-4f18-ac1e-8714b1ef56f7",
"title": "GRB 231222B: Fermi-LAT detection",
"submitter": "Hop gcn.circular",
"authors": "N. Di Lalla at Stanford University <niccolo.dilalla@stanford.edu>",
"data": {
"date": "23/12/22 21:31:22 GMT",
"from": "N. Di Lalla at Stanford University <niccolo.dilalla@stanford.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35416"
},
"title": "GCN CIRCULAR",
"number": "35416",
"subject": "GRB 231222B: Fermi-LAT detection"
},
"message_text": "N. Di Lalla (Stanford University), F. Longo (University and INFN, Trieste), A. Holzmann (DF, University of Buenos Aires, Argentina) report on behalf of the Fermi-LAT Collaboration:\n\nOn December 22, 2023 Fermi-LAT detected high-energy emission from GRB 231222B, which was also detected by Fermi-GBM (trigger 724922767 / 231222310).\n\nThe best LAT on-ground location is found to be\n\nRA, Dec = 251.35, 19.55 (degrees, J2000)\n\nwith an error radius of 0.3 deg (90% containment, statistical error only). This was 19 deg from the LAT boresight at the time of the GBM trigger:\n\nT0 = 07:26:02.19 UT.\n\nThe data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval**0-600 s after the GBM trigger is (1.9 +/- 0.7) E-6**ph/cm2/s.\n\nThe estimated photon index above 100 MeV is -1.7 +/- 0.3. The highest-energy photon is a 3.6 GeV event which is observed 362 seconds after the GBM trigger.\n\nA Swift ToO has been approved for this burst.\n\nThe Fermi-LAT point of contact for this burst is Makoto Arimoto (arimoto@se.kanazawa-u.ac.jp <mailto:arimoto@se.kanazawa-u.ac.jp>)\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35416.",
"published": "2023-12-22T21:31:33.760068Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-22T21:31:33.760085Z",
"modified": "2023-12-22T21:31:33.767353Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5473,
"topic": "gcn.circular",
"uuid": "edd92287-fe5c-4aff-9ef6-2f7b8b3d8273",
"title": "LAT GRB231222.31: 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": "23/12/22 21:55:52 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35417"
},
"title": "GCN CIRCULAR",
"number": "35417",
"subject": "LAT GRB231222.31: 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the LAT GRB231222.31 (trigger No 724922767,16h 45m 24.00s , +19d 30m 00.0s, R=0.299833) errorbox 9379 sec after notice time and 49215 sec after trigger time at 2023-12-22 21:06:17 UT, with upper limit up to 18.1 mag. The observations began at zenith distance = 81 deg. The sun altitude is -36.5 deg.\n\nThe galactic latitude b = 36 deg., longitude l = 38 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#40436\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 49278 | 2023-12-22 21:06:17 | MASTER-Tunka | (16h 44m 15.30s , +19d 23m 06.7s) | C | 125 | 14.8 |\n 51473 | 2023-12-22 21:42:45 | MASTER-Tunka | (16h 44m 16.33s , +19d 24m 26.0s) | C | 140 | 15.2 |\n 51624 | 2023-12-22 21:45:16 | MASTER-Tunka | (16h 44m 22.24s , +19d 23m 36.0s) | C | 140 | 18.1 |\n 51733 | 2023-12-22 21:47:50 | MASTER-Tunka | (16h 44m 17.59s , +19d 22m 40.5s) | C | 50 | 17.4 |\n 51781 | 2023-12-22 21:47:50 | MASTER-Tunka | (16h 44m 17.59s , +19d 22m 40.4s) | C | 145 | 18.1 | Coadd\n 51794 | 2023-12-22 21:48:50 | MASTER-Tunka | (16h 44m 22.74s , +19d 22m 52.8s) | C | 50 | 17.5 |\n 51851 | 2023-12-22 21:49:50 | MASTER-Tunka | (16h 44m 20.66s , +19d 24m 35.0s) | C | 45 | 17.5 |\n 51908 | 2023-12-22 21:50:47 | MASTER-Tunka | (16h 44m 20.65s , +19d 23m 01.1s) | C | 45 | 17.5 |\nFilter C is a clear (unfiltred) band.\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/35417.",
"published": "2023-12-22T21:56:02.033936Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-22T21:56:02.033952Z",
"modified": "2023-12-22T21:56:02.041599Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5476,
"topic": "gcn.circular",
"uuid": "7d4a335f-8e23-4d87-a565-0648c5383492",
"title": "GRB 231222B: Fermi GBM Detection",
"submitter": "Hop gcn.circular",
"authors": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"data": {
"date": "23/12/23 00:07:56 GMT",
"from": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35418"
},
"title": "GCN CIRCULAR",
"number": "35418",
"subject": "GRB 231222B: Fermi GBM Detection"
},
"message_text": "P. Veres (UAH), V. Sharma (NASA-GSFC/UMBC) and R. Hamburg (CNRS/IN2P3) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 07:26:02.19 UT on 22 December 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 231222B (trigger 724922767/231222310).\nThe GRB was also detected by Fermi LAT (Di Lalla et al, GCN 35416).\n\nThe angle from the Fermi LAT boresight is 19 degrees.\n\nThe GBM light curve consists of two widely separated pulses with a duration (T90)\nof about 121 s (50-300 keV). The time-averaged spectrum\nfrom T0-5.1 to T0+126.0 s is best fit by\na simple power law function with index -1.55 +/- 0.04.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.7 +/- 0.6)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.7 s in the 10-1000 keV band is 6.0 +/- 0.3 ph/s/cm^2.\n\n\nA power law function with an exponential\nhigh-energy cutoff fits the spectrum equally well.\nThe power law index is -1.09 +/- 0.16 and\nthe cutoff energy, parameterized as Epeak, is 257 +/- 67 keV.\n\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35418.",
"published": "2023-12-23T00:08:08.736686Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-23T00:08:08.736701Z",
"modified": "2023-12-23T00:08:08.743739Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5482,
"topic": "gcn.circular",
"uuid": "4be7bfc2-e18c-4ed7-95f4-2fd1cd054d51",
"title": "Fermi trigger No 724921799: 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": "23/12/23 03:46:31 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35419"
},
"title": "GCN CIRCULAR",
"number": "35419",
"subject": "Fermi trigger No 724921799: 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) started inspect of the Fermi GRB231222.30 (trigger No 724921799,10h 45m 43.20s , -35d 59m 24.0s, R=1.21) errorbox 48203 sec after notice time and 48249 sec after trigger time at 2023-12-22 20:34:04 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 78 deg. The sun altitude is -27.2 deg.\n\nThe galactic latitude b = 20 deg., longitude l = 277 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#39970\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 48280 | 2023-12-22 20:34:04 | MASTER-SAAO | (10h 37m 19.07s , -36d 39m 28.2s) | C | 60 | 17.5 |\nFilter C is a clear (unfiltred) band.\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/35419.",
"published": "2023-12-23T03:46:42.551744Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-23T03:46:42.551762Z",
"modified": "2023-12-23T03:46:42.557188Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5487,
"topic": "gcn.circular",
"uuid": "9586b28d-2c47-4245-bb1d-4d33371ae01b",
"title": "LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Yu-Chen Zhou <zhouyuchen21@mails.ucas.ac.cn>",
"data": {
"date": "23/12/23 05:28:59 GMT",
"from": "Yu-Chen Zhou <zhouyuchen21@mails.ucas.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35420"
},
"title": "GCN CIRCULAR",
"number": "35420",
"subject": "LIGO/Virgo/KAGRA S231223j: 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 S231223j during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-12-23 03:28:36.047 UTC (GPS time: 1387337334.047). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], and PyCBC Live [4] analysis pipelines.\n\nS231223j is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.1e-09 Hz, or about one in 28 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231223j\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nThere were noise transients (glitches) in the LIGO Hanford detector near the time of the signal which may affect the parameters or the significance of the candidate.\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%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] 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 [6], distributed via GCN notice about 24 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [6], 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 3342 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1847 +/- 568 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] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35420.",
"published": "2023-12-23T05:29:11.683629Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-23T05:29:11.683650Z",
"modified": "2023-12-23T05:29:11.691007Z",
"nonlocalizedevents": [
{
"event_id": "S231223j"
}
],
"targets": []
},
{
"id": 6505,
"topic": "gcn.circular",
"uuid": "2192f996-33f6-48a9-aadc-b7a6e693f058",
"title": "GRB 240411B: HiPERCAM/GTC observation",
"submitter": "Hop gcn.circular",
"authors": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"data": {
"date": "24/04/12 19:07:20 GMT",
"from": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36074"
},
"title": "GCN CIRCULAR",
"number": "36074",
"subject": "GRB 240411B: HiPERCAM/GTC observation"
},
"message_text": "A. de Ugarte Postigo (CNRS, OCA, LAM), N. R. Tanvir (U. Leicester), J. F. Agui Fernandez (CAHA), A. Martin-Carrillo (UCD), C. C. Thoene (ASU-CAS), L. Izzo (INAF-OACn & DARK/NBI), J. P. U. Fynbo (DAWN/NBI), G. Lombardi (GRANTECAN), S. Geier (GRANTECAN) report:\n\nWe observed the field of GRB 240411B (Parsotan et al. GCN 36063) with HiPERCAM on the 10.4m GTC, at the Roque de Los Muchachos Observatory (Spain). We simultaneously obtained 20x60s exposure in each of the u, g, r, i, and z filters. The transparency was bad due to strong calima and the seeing was also poor. The afterglow (Izzo et al. 36064; Goad et al. GCN 36065; Schneider et al. GCN 36067; Ror et al. GCN 36069) is well detected in g, r, i and z, but not in u-band, where the limit is shallow. Observations had a mean time of 0.4256 days after the burst. We measure an r-band magnitude (AB) of r = 23.21+/- 0.08 mag as compared with field star magnitudes from the SDSS.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36074.",
"published": "2024-04-12T19:07:40.008823Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T19:07:40.008838Z",
"modified": "2024-04-12T19:07:40.031502Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5510,
"topic": "gcn.circular",
"uuid": "79110c08-17d8-435f-b2d3-0ad226ad105c",
"title": "LIGO/Virgo/KAGRA S231223j: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"data": {
"date": "23/12/23 23:55:45 GMT",
"from": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35422"
},
"title": "GCN CIRCULAR",
"number": "35422",
"subject": "LIGO/Virgo/KAGRA S231223j: 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 S231223j (GCN Circular 35420). 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/S231223j\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3520 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4468 +/- 1602 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) and Morisaki et al. arXiv:2307.13380 (2023)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35422.",
"published": "2023-12-23T23:55:59.998428Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-23T23:55:59.998443Z",
"modified": "2023-12-23T23:56:00.053346Z",
"nonlocalizedevents": [
{
"event_id": "S231223j"
}
],
"targets": []
},
{
"id": 6847,
"topic": "gcn.circular",
"uuid": "20ea9b1a-e6e5-4ea3-a2fc-934e152bd6f5",
"title": "LIGO/Virgo/KAGRA S240422ed: MeerLICHT and BlackGEM observations report",
"submitter": "Hop gcn.circular",
"authors": "Paul Groot at Radboud University Nijmegen <p.groot@astro.ru.nl>",
"data": {
"date": "24/04/23 00:21:49 GMT",
"from": "Paul Groot at Radboud University Nijmegen <p.groot@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36237"
},
"title": "GCN CIRCULAR",
"number": "36237",
"subject": "LIGO/Virgo/KAGRA S240422ed: MeerLICHT and BlackGEM observations report"
},
"message_text": "P.J. Groot (Radboud/UCT/SAAO), S. Bloemen (Radboud), D. Pieterse\n(Radboud), H. Tranin (U Barcelona), I. Arcavi (TelAviv) and P. Vreeswijk\n(Radboud) report on behalf of the BlackGEM/MeerLICHT consortium:\n\nFollowing the LVK Alert S240422ed (GCN36235, GCN36236) the 0.6m\nBlackGEM and MeerLICHT telescopes array, located at the ESO La Silla,\nChile and SAAO Sutherland, South Africa observatories, have started to\nobserve the error box with the ML1/BG2/BG4 telescopes using a\npredefined sky-grid tiling that covers the accessible part of the\nerror region using the ranked-tiling method as outlined in Ghosh et\nal. (2016). Observations were obtained in the q band using a 2x10-tile\nstrategy. Starting with the highest probability tiles a set of\n10-tiles was observed in q-band filter (440-720nm) using 60s\nexposures, which was repeated directly after the first 10 tiles were\nobserved. Subsequently tiles 11-20 were observed in the same two-visit\nmanner, etc.\n\nObservations started at 2024-04-22 21:34 with MeerLICHT and 2024-04-22\n23:10 with BlackGEM. Sutherland skies show high cirrus, which will\nlimit the photometric depth. La Silla skies are clear. Photometric depth\nwill be limited by the Full Moon.\n\nAll observations are reported to the Gravitational Wave Treasure Map\n(https://treasuremap.space/). Any candidates will be reported to the\nGCN server as well as to the Transient Name Server\n(https://www.wis-tns.org/).\n\nObservations are continuing.\n\nThe BlackGEM/MeerLICHT telescopes are designed, installed and operated\nby a consortium of the following universities and institutions:\nRadboud University, Netherlands Research School for Astronomy NOVA, KU\nLeuven, Armagh Observatory and Planetarium, Danish Technical\nUniversity, Durham University, Hebrew University of Jerusalem, South\nAfrican Astronomical Observatory, Tel Aviv University, Texas Tech\nUniversity, University of Amsterdam, University of Barcelona,\nUniversity of California at Davis, University of Cape Town, University\nof Hamburg, University of Manchester, University of Oxford, University\nof Potsdam, University of Valparaiso, University of Warwick, Weizmann\nInstitute\n\nReferences:\nGhosh et al., 2016, A&A 592, 82\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36237.",
"published": "2024-04-23T00:22:08.351173Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-23T00:22:08.351185Z",
"modified": "2024-04-23T00:22:08.359039Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 6940,
"topic": "gcn.circular",
"uuid": "95bb639e-b534-4205-a393-88f65218f441",
"title": "LIGO/Virgo/KAGRA S240422ed: Second night Pan-STARRS observations of the skymap",
"submitter": "Hop gcn.circular",
"authors": "Ken Smith at Queen's University Belfast <k.w.smith@qub.ac.uk>",
"data": {
"date": "24/04/25 14:34:28 GMT",
"from": "Ken Smith at Queen's University Belfast <k.w.smith@qub.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36303"
},
"title": "GCN CIRCULAR",
"number": "36303",
"subject": "LIGO/Virgo/KAGRA S240422ed: Second night Pan-STARRS observations of the skymap"
},
"message_text": "K. W. Smith (QUB), M. Huber (IfA, Hawaii), S. Srivastav (Oxford), S. J. Smartt (Oxford/QUB), K. C. Chambers, (IfA, Hawaii), D. R. Young, M. Nicholl, M. D. Fulton, A. Aamer, C. R. Angus, M. McCollum, T. Moore, S. Sim, J. Weston, X. Sheng (QUB), P. Ramsden (QUB/Birmingham), L. Shingles (GSI/QUB), J. Sommer (LMU/QUB), J. Gillanders, H. Stevance, L. Rhodes, A. Andersson (Oxford), A. S. B. Schultz, T. de Boer, J. Herman, J. Fairlamb, H. Gao, C. C. Lin, T. Lowe, E. Magnier, P. Minguez, I. A. Smith, R. J. Wainscoat (IfA, Univ. Hawaii), T.-W. Chen (NCU), A. Rest (STScI), C. Stubbs (Harvard):\n\nWe report additional observations of the Bilby.fits skymap of the NSBH merger event S240422ed (The LIGO-Virgo-Kagra Collaboration, GCN 36236) with the Pan-STARRS telescope system (Chambers et al., 2016, ArXiv e-prints, 1612.05560). Observations on MJD 60423 yielded no viable candidates (see GCN 36258 for coverage strategy.)\n\nOn MJD 60424 we covered 174 square degrees of the bilby.fits skymap 90% area, and covered a sky region totalling 66% of the event's full localisation. We covered nearly all the 90% region above declination -30 degrees, due to lack of reference frames below that declination. The image quality on MJD 60424 was significantly better than on 60423.\n\nThe depths of these stacked images were typically i < 20.54 +/- 0.44 , z < 20.47 +/- 0.41.\n\nData acquisition began at MJD 60424.23261477 or 2024-04-24 05:34:57 (UTC), 32.0 hrs after the merger event (which was 60422.89946078). The last image was taken at 60424.34269043.\n\nThese additional observations yielded the following transient objects. We ran forced photometry on the two day coverage. We do not find any of them to have the right combination of features to be considered a compelling candidate optical counterpart. (+Days = days since GW event). The photometric redshifts (from NED) are either too large or the sources have no lightcurve evolution. We have not yet run historical forced photometry in ATLAS or ZTF to further rule them out as we donât consider them to be good candidates for the counterpart of S240422ed.\n\nName | TNS Name | RA (J2000) | Dec (J2000) | +Days | Comment\nPS24bxc | AT2024hfu | 08:28:56.91 | -22:40:22.3 | 1.35 | Offset from host, NED photz = 0.092748, lightcurve flat\nPS24bxi | AT2024hga | 08:13:52.97 | -24:56:55.9 | 0.38 | Nuclear source, lightcurve flat, no photz, i-z ~ 0\nPS24bxj | AT2024hgb | 08:00:18.42 | -30:28:07.4 | 0.35 | NED photz = 0.099940, lightcurve flat\nPS24bwz | AT2024hdl | 08:21:53.45 | -30:06:07.7 | 0.35 | DECam discovery, lightcurve flat\nPS24bxk | AT2024hgc | 08:28:11.57 | -21:30:43.7 | 1.35 | On host, no photz, lightcurve flat\nPS24bxf | AT2024hfx | 08:19:41.57 | -17:28:07.4 | 1.37 | Rising lightcurve, faint host, i-z ~0, likely higher redshift SN\nPS24bxo | AT2024hfo | 08:15:50.35 | -28:40:10.0 | 1.34 | DECam discovery, lightcurve flat, offset from host with no z\nPS24bxb | AT2024hft | 08:26:40.13 | -25:57:42.9 | 1.35 | Nuclear, photz = 0.091043 from NED.\n\nThe discoveries from this program are a byproduct of the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) NEO survey observations. Operation of the Pan-STARRS1 and Pan-STARRS2 telescopes is primarily supported by the National Aeronautics and Space Administration under Grant No. NNX12AR65G and Grant No. NNX14AM74G issued through the SSO Near-Earth Object Observations Program. Data are processed at Queen's University Belfast and are enabled through the STFC grants to Oxford and QUB : ST/Y001605/1, ST/T000198/1, ST/X001253/1. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36303.",
"published": "2024-04-25T14:34:59.187580Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-25T14:34:59.187596Z",
"modified": "2024-04-25T14:34:59.198024Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 5514,
"topic": "gcn.circular",
"uuid": "9af950e0-5ee4-4f3c-94ea-321727f49398",
"title": "LIGO/Virgo/KAGRA S231224e: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "yuchiung.lin@mx.nthu.edu.tw",
"data": {
"date": "23/12/24 03:24:51 GMT",
"from": "yuchiung.lin@mx.nthu.edu.tw",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35423"
},
"title": "GCN CIRCULAR",
"number": "35423",
"subject": "LIGO/Virgo/KAGRA S231224e: 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 S231224e during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-12-24 02:43:21.970 UTC (GPS time: 1387421019.970). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS231224e is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.5e-09 Hz, or about one in 20 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231224e\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\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%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] 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 12%.\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 [5], distributed via GCN notice about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], 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 520 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 904 +/- 237 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] 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35423.",
"published": "2023-12-24T03:25:00.987840Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-24T03:25:00.987863Z",
"modified": "2023-12-24T03:25:00.996716Z",
"nonlocalizedevents": [
{
"event_id": "S231224e"
}
],
"targets": []
},
{
"id": 5522,
"topic": "gcn.circular",
"uuid": "2efe54f2-80e8-46c6-9074-f92fa5847fae",
"title": "GRB 231224A: 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": "23/12/24 20:59:57 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35426"
},
"title": "GCN CIRCULAR",
"number": "35426",
"subject": "GRB 231224A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 20:49:15 UT on 24 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231224A (trigger 725143760.994196 / 231224868).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 102.3, Dec = -71.2 (J2000 degrees, equivalent to J2000 06h 49m, -71d 12'), with a statistical uncertainty of 11.9 degrees.\n\nThe angle from the Fermi LAT boresight is 24.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231224868/quicklook/glg_skymap_all_bn231224868.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/bn231224868/quicklook/glg_healpix_all_bn231224868.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231224868/quicklook/glg_lc_medres34_bn231224868.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35426.",
"published": "2023-12-24T21:00:13.406492Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-24T21:00:13.406509Z",
"modified": "2023-12-24T21:00:13.414446Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5523,
"topic": "gcn.circular",
"uuid": "1c6ed7be-4397-4935-8a3b-9bccc6627a3e",
"title": "Fermi trigger No 725143760: 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": "23/12/24 21:16:05 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35427"
},
"title": "GCN CIRCULAR",
"number": "35427",
"subject": "Fermi trigger No 725143760: 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) started inspect of the Fermi GRB231224.87 (trigger No 725143760,06h 49m 09.60s , -71d 10m 12.0s, R\u0011.88) errorbox 348 sec after notice time and 390 sec after trigger time at 2023-12-24 20:55:46 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 36 deg. The sun altitude is -29.4 deg.\n\nThe galactic latitude b = -26 deg., longitude l = 282 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#42087\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 420 | 2023-12-24 20:55:46 | MASTER-SAAO | (05h 53m 02.24s , -65d 19m 23.8s) | C | 60 | 17.9 |\n 420 | 2023-12-24 20:55:46 | MASTER-SAAO | (06h 13m 27.52s , -65d 30m 39.0s) | C | 60 | 18.1 |\n 511 | 2023-12-24 20:57:16 | MASTER-SAAO | (06h 03m 17.13s , -63d 24m 19.9s) | C | 60 | 18.3 |\n 511 | 2023-12-24 20:57:16 | MASTER-SAAO | (06h 22m 19.48s , -63d 35m 38.8s) | C | 60 | 18.6 |\n 590 | 2023-12-24 20:58:36 | MASTER-SAAO | (06h 21m 12.31s , -67d 12m 33.5s) | C | 60 | 18.1 |\n 590 | 2023-12-24 20:58:36 | MASTER-SAAO | (06h 43m 11.91s , -67d 23m 56.6s) | C | 60 | 18.4 |\n 681 | 2023-12-24 21:00:07 | MASTER-SAAO | (05h 41m 42.60s , -67d 14m 18.9s) | C | 60 | 17.3 |\n 681 | 2023-12-24 21:00:07 | MASTER-SAAO | (06h 03m 44.79s , -67d 25m 34.9s) | C | 60 | 17.6 |\n 765 | 2023-12-24 21:01:31 | MASTER-SAAO | (06h 29m 42.58s , -65d 19m 28.2s) | C | 60 | 19.0 |\n 765 | 2023-12-24 21:01:31 | MASTER-SAAO | (06h 50m 06.29s , -65d 30m 55.7s) | C | 60 | 18.7 |\nFilter C is a clear (unfiltred) band.\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/35427.",
"published": "2023-12-24T21:16:15.601872Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-24T21:16:15.601893Z",
"modified": "2023-12-24T21:16:15.608934Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5516,
"topic": "gcn.circular",
"uuid": "0aff9c08-db20-4c35-aabb-93e6b704089f",
"title": "LIGO/Virgo/KAGRA S231224e: Updated Sky localization and Source Classification",
"submitter": "Hop gcn.circular",
"authors": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"data": {
"date": "23/12/24 04:34:55 GMT",
"from": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35424"
},
"title": "GCN CIRCULAR",
"number": "35424",
"subject": "LIGO/Virgo/KAGRA S231224e: Updated Sky localization and 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 S231224e (GCN Circular 35423). 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/S231224e\n\nAfter parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (0%).\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 394 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 863 +/- 213 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) and Morisaki et al. arXiv:2307.13380 (2023)\n [2] Rose et al. arXiv:2201.05263 (2022) and Pankow et al. PRD 92, 023002 (2015)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35424.",
"published": "2023-12-24T04:35:06.650751Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-24T04:35:06.650769Z",
"modified": "2023-12-24T04:35:06.657892Z",
"nonlocalizedevents": [
{
"event_id": "S231224e"
}
],
"targets": []
},
{
"id": 5521,
"topic": "gcn.circular",
"uuid": "3a4f8ff0-cf95-44ca-b9eb-db37f59f9409",
"title": "GRB 231222B: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/12/24 10:24:25 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35425"
},
"title": "GCN CIRCULAR",
"number": "35425",
"subject": "GRB 231222B: 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, L. Szakszonova, 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.), T. 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 231222B (Fermi/GBM detection: GCN 35418; Fermi/LAT detection: GCN 35416; INTEGRAL/SPI-ACS peak detection at 2023-12-22 ~07:26:03 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-12-22 07:26:04 UTC. The T90 duration measured by GRBAlpha is 5 s and the overall significance during T90 reaches 6.2 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB231222B_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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35425.",
"published": "2023-12-24T10:24:40.273127Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-24T10:24:40.273144Z",
"modified": "2023-12-24T10:24:40.282400Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5537,
"topic": "gcn.circular",
"uuid": "330a086b-ad84-4b89-aabf-2cf6804822b3",
"title": "LIGO/Virgo/KAGRA S231226av: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "D. Belardinelli at INFN (Rome ToV) <belardinelli@roma2.infn.it>",
"data": {
"date": "23/12/26 11:23:48 GMT",
"from": "D. Belardinelli at INFN (Rome ToV) <belardinelli@roma2.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35428"
},
"title": "GCN CIRCULAR",
"number": "35428",
"subject": "LIGO/Virgo/KAGRA S231226av: 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 S231226av during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-12-26 10:15:20.306 UTC (GPS time: 1387620938.306). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], and PyCBC Live [4] analysis pipelines.\n\nS231226av is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.1e-50 Hz, or about one in 1e42 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231226av\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), NSBH (<1%), BNS (<1%), or Terrestrial (<1%).\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%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] 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 [6], distributed via GCN notice about 30 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [6], 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 244 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1041 +/- 235 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] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35428.",
"published": "2023-12-26T11:24:04.400140Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-26T11:24:04.400156Z",
"modified": "2023-12-26T11:24:04.406370Z",
"nonlocalizedevents": [
{
"event_id": "S231226a"
}
],
"targets": []
},
{
"id": 5541,
"topic": "gcn.circular",
"uuid": "2ca1521f-b679-44fb-b96f-ff72802387ee",
"title": "LIGO/Virgo/KAGRA S231226av: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"data": {
"date": "23/12/26 16:24:40 GMT",
"from": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35429"
},
"title": "GCN CIRCULAR",
"number": "35429",
"subject": "LIGO/Virgo/KAGRA S231226av: 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 S231226av (GCN Circular 35428). 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/S231226av\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 199 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1218 +/- 171 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) and Morisaki et al. arXiv:2307.13380 (2023)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35429.",
"published": "2023-12-26T16:24:57.244118Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-26T16:24:57.244133Z",
"modified": "2023-12-26T16:24:57.251378Z",
"nonlocalizedevents": [
{
"event_id": "S231226a"
}
],
"targets": []
},
{
"id": 6941,
"topic": "gcn.circular",
"uuid": "65519768-4515-4597-883d-0470f11f5eea",
"title": "S240422ed: MeerLICHT/BlackGEM photometry on AT2024hfx and archival ZTF detection",
"submitter": "Hop gcn.circular",
"authors": "Paul Groot at Radboud University Nijmegen <p.groot@astro.ru.nl>",
"data": {
"date": "24/04/25 15:00:51 GMT",
"from": "Paul Groot at Radboud University Nijmegen <p.groot@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36304"
},
"title": "GCN CIRCULAR",
"number": "36304",
"subject": "S240422ed: MeerLICHT/BlackGEM photometry on AT2024hfx and archival ZTF detection"
},
"message_text": "P.J. Groot (Radboud, UCT, SAAO), H. Tranin (Barcelona), H. Wichern\n(DTU), G. Leloudas (DTU), F. Stoppa (Radboud), I. Arcavi (Tel Aviv),\nS. Bloemen (Radboud), P.M. Vreeswijk (Radboud), D. Pieterse (Radboud)\nreport on behalf of the BlackGEM/MeerLICHT Consortium:\n\nFollowing the LVK Alert S240422ed the 0.6m BlackGEM/MeerLICHT\ntelescope array located at the ESO La Silla, Chile and SAAO\nSutherland, South Africa observatories observed the error box with the\nML1/BG2/BG4 telescopes using a predefined sky-grid tiling that covers\nthe accessible part of the error region using the ranked-tiling method\nas outlined in Ghosh et al. (2016). Observations were obtained in the\nq band, spanning 440-720nm, using a 2x10-tile strategy. Starting with\nthe highest probability tiles a set of 10-tiles was observed in the\nq-band filter using 60s exposures each, which was repeated directly\nafter the first 10 tiles were observed. Subsequently tiles 11-20 were\nobserved in the same two-visit manner, etc.\n\nObservations on the Updated error region of S240422ed (Biscoveanu et\nal., GCN Circular 36240) were repeated on the nights of 2024-04-23 and\n2024-04-24 following the same tiling pattern.\n\nTransient candidates were extracted using the BlackBOX/ZOGY pipeline,\nwhere astrophotometric calibrations are performed using Gaia DR3\nphotometry and astrometry. Possible asteroids are filtered using the\ndaily-updated lists of known asteroids from the Minor Planet\nCenter. All coordinates are given in the ICRS, epoch J2016.0\nastrometric frame and magnitudes quoted are on the AB system.\n\nWe report the following detections on the candidate AT2024hfx, which\nwas reported to the Transient Name Server by the PanSTARRS\ncollaboration (Chambers et al. 2024, TNS alert 208432).\n\nName RA (ICRS) Dec(ICRS) Filter AB-Mag Date-UT\nMLTJ081941.58-172807.2 124.92321 -17.46874 q 18.243+/-0.06 2024-04-24\n19:10:16\nMLTJ081941.58-172807.2 124.92321 -17.46874 q 18.311+/-0.07 2024-04-24\n19:24:26\nBGEMJ081941.57-172807.4 124.92323 -17.46869 q 18.546+/-0.07 2024-04-25\n00:08:05\nBGEMJ081941.57-172807.4 124.92323 -17.46869 q 18.497+/-0.07 2024-04-25\n00:23:14\n\nThe last non-detection at this position was obtained on 2024-04-07\n00:38:21 in the i-band with a 5-sigma point-source transient limiting\nmagnitude at the position of the source of i>18.91\n\nIt was pointed out to us by G. Hosseinzadeh that at the position of\nAT2024hfx, there is a single, but clear archival detection in ZTF as\nZTF21aawlmgc on 2021-04-19 03:52:10 at g\u0019.035 +/- 0.165. Although\nclassified as 'bogus' in the ZTF Stamp Classifier the position\ncoincides with AT2024hfx.\n\nThe BlackGEM/MeerLICHT telescopes are designed, installed and operated\nby a consortium of the following universities and institutions:\nRadboud University, Netherlands Research School for Astronomy NOVA, KU\nLeuven, Armagh Observatory and Planetarium, Hebrew University of\nJerusalem, South African Astronomical Observatory, Technical\nUniversity of Denmark, Tel Aviv University, Texas Tech University,\nUniversity of Amsterdam, University of Barcelona, University of\nCalifornia at Davis, University of Cape Town, University of Durham,\nUniversity of Hamburg, University of Manchester, University of Oxford,\nUniversity of Potsdam, University of Valparaiso, University of\nWarwick, Weizmann Institute\n\nReferences:\nGhosh et al., 2016, A&A 592, 82\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36304.",
"published": "2024-04-25T15:01:07.065551Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-25T15:01:07.065571Z",
"modified": "2024-04-25T15:01:07.074343Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 6517,
"topic": "gcn.circular",
"uuid": "67cc0bea-6e93-4f4e-9589-2bd02e098f65",
"title": "LIGO/Virgo/KAGRA S240413p: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "rein.yongxiang.yang@gmail.com",
"data": {
"date": "24/04/13 03:13:04 GMT",
"from": "rein.yongxiang.yang@gmail.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36075"
},
"title": "GCN CIRCULAR",
"number": "36075",
"subject": "LIGO/Virgo/KAGRA S240413p: 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 S240413p during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-04-13 02:20:19.852 UTC (GPS time: 1397010037.852). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], and PyCBC Live [4] analysis pipelines.\n\nS240413p is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S240413p\n\nAfter parameter estimation by RapidPE-RIFT [5], the classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<1%), or BNS (<1%).\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%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] 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 40%.\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 [7], distributed via GCN notice about 31 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], 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 well fit by an ellipse with an area of 46 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(10h53m, +09d27m, 8.32d, 1.75d, 130.27d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 510 +/- 115 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/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [2] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625\n [3] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913\n [4] Dal Canton et al. ApJ 923, 254 (2021) doi:10.1088/1361-6382/abe913\n [5] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002\n [6] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [7] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36075.",
"published": "2024-04-13T03:13:19.079137Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T03:13:19.079154Z",
"modified": "2024-04-13T03:13:19.086910Z",
"nonlocalizedevents": [
{
"event_id": "S240413p"
}
],
"targets": []
},
{
"id": 5568,
"topic": "gcn.circular",
"uuid": "10aea127-380d-4d4a-8361-101fb37ce2e2",
"title": "IPN triangulation of GRB 231224A (short)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <dmitrysvinkin@gmail.com>",
"data": {
"date": "23/12/27 12:51:08 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <dmitrysvinkin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35430"
},
"title": "GCN CIRCULAR",
"number": "35430",
"subject": "IPN triangulation of GRB 231224A (short)"
},
"message_text": "D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,\non behalf of the IPN,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM team,\n\nand\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\nreport:\n\nThe short-duration GRB 231224A\n(Fermi-GBM detection: The Fermi GBM team, GCN 35426)\nwas detected by Fermi (GBM trigger 725143760) and\nINTEGRAL (SPI-ACS) at about 74956 s UT (20:49:16).\n\nWe have triangulated it to a GBM-SPI-ACS annulus centered at\nRA(2000)#0.929 deg (15h 23m 43s) Dec(2000)=-83.517 deg (-83d 30' 60\"),\nwhose radius is 32.644 +/- 5.664 deg (3 sigma).\n\nThe annulus combined with the Fermi-GBM final position (GCN 35426;\nglg_healpix_all_bn231224868_v00) gives ~792 sq. deg (3 sigma) localization region.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB231224_T74955/IPN/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35430.",
"published": "2023-12-27T12:51:22.809616Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-27T12:51:22.809631Z",
"modified": "2023-12-27T12:51:22.815858Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5569,
"topic": "gcn.circular",
"uuid": "b365cf3f-7cdf-4856-bffc-db41ddf6de07",
"title": "LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/12/28 03:22:19 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35431"
},
"title": "GCN CIRCULAR",
"number": "35431",
"subject": "LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), James DeLaunay (PSU) report:\n\nSwift/BAT was observing 90.3% of the GW localization probability (Bilby.multiorder.fits) at merger time. A fraction 20% 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 12.9 9.3 8.3 10.4\n1.024 6.6 4.8 4.2 5.3\n4.096 3.5 2.5 2.3 2.8\n16.38 2.1 1.6 1.4 1.7\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.10433190\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.10433196\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35431.",
"published": "2023-12-28T03:22:37.035142Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-28T03:22:37.035158Z",
"modified": "2023-12-28T03:22:37.074855Z",
"nonlocalizedevents": [
{
"event_id": "S231224e"
}
],
"targets": []
},
{
"id": 5572,
"topic": "gcn.circular",
"uuid": "ab5bbbf6-94d7-4fc5-9088-47759c8064c2",
"title": "Swift Triggers 1205103, 1205104, 1205107 and 1205110 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/12/28 09:28:58 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35432"
},
"title": "GCN CIRCULAR",
"number": "35432",
"subject": "Swift Triggers 1205103, 1205104, 1205107 and 1205110 are not astrophysical events"
},
"message_text": "\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift Triggers 1205103, 1205104, 1205107 and 1205110, between\n2023-12-28 08:13 and 08:58 UT, were caused by a star tracker\nloss-of-lock event, and are not interesting astrophysical events.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35432.",
"published": "2023-12-28T09:29:12.407751Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-28T09:29:12.407767Z",
"modified": "2023-12-28T09:29:12.414881Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6518,
"topic": "gcn.circular",
"uuid": "eba2f7ea-d6ad-4f4d-9665-f62b45871161",
"title": "LIGO/Virgo/Kagra S240413p: NED Galaxies in the Localization Volume",
"submitter": "Hop gcn.circular",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"data": {
"date": "24/04/13 03:37:22 GMT",
"from": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36076"
},
"title": "GCN CIRCULAR",
"number": "36076",
"subject": "LIGO/Virgo/Kagra S240413p: NED Galaxies in the Localization Volume"
},
"message_text": "David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)\n\nOn behalf of the NASA/IPAC Extragalactic Database (NED) Team.\n\nWe spatially cross-matched the LVK S240413p-3-Initial sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 6336 galaxies within the 90% containment volume, and we list in Table 1 the top 20 galaxies located in the 90% volume sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full list of galaxies in the 90% volume go to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/.\n\nSince S240413p is likely a BBH event, we also provide a list of galaxy candidates with AGN/QSO object types in the 90% volume (see Table 2).\n\n Galaxy ra dec objtype DistMpc DistMpc_unc m_NUV m_NUV_unc m_Ks m_Ks_unc m_W1 m_W1_unc P_3D P_3D_LumW1\n (Deg) (Deg) (Mpc) (AB) (Vega) (Vega) (Prob) (Prob)\n------------------------- ---------- --------- ------- ------- ----------- ----- --------- ----- -------- ----- -------- -------- ----------\nWISEA J110649.68+135510.5 166.706959 13.919548 G 553.31 0.08 -- -- 12.66 0.02 10.55 0.01 8.34e-01 6.33e-03\nWISEA J105410.09+104600.0 163.542222 10.766754 G 549.89 0.04 -- -- 15.37 0.41 9.95 0.01 4.19e-01 5.45e-03\nWISEA J110211.55+090435.6 165.548127 9.076514 G 561.47 0.28 -- -- 13.49 0.20 10.88 0.01 8.66e-01 4.99e-03\nWISEA J110012.38+084616.3 165.051598 8.771199 QSO 465.07 0.07 18.35 0.02 12.32 0.09 10.79 0.01 8.51e-01 3.67e-03\nWISEA J104505.15+084339.0 161.271533 8.727526 QSO 587.14 0.05 17.99 0.03 13.22 0.08 11.39 0.02 7.91e-01 3.13e-03\nWISEA J104600.10+090626.9 161.500424 9.107589 G 401.65 0.10 -- -- 13.17 0.20 10.66 0.01 7.00e-01 2.53e-03\nWISEA J110022.85+130955.1 165.095191 13.165431 G 615.03 0.11 -- -- 12.54 0.10 11.84 0.01 8.33e-01 2.39e-03\nWISEA J103925.86+051328.1 159.857765 5.224443 G 255.51 -- -- -- 13.71 0.19 9.96 0.01 8.10e-01 2.26e-03\nWISEA J111006.19+115942.8 167.525667 11.995333 G 587.23 0.10 21.52 0.32 12.09 0.12 11.96 0.01 8.84e-01 2.06e-03\nWISEA J103257.43+021443.9 158.239273 2.245507 G 602.96 0.25 21.84 0.17 12.50 0.12 12.04 0.01 8.97e-01 2.06e-03\nWISEA J110952.96+120126.4 167.470699 12.024011 G 595.42 0.09 -- -- -- -- 11.97 0.01 8.67e-01 2.05e-03\nWISEA J103402.72+013245.4 158.511323 1.545883 G 395.67 0.10 -- -- 12.44 0.13 11.16 0.01 8.87e-01 1.97e-03\nWISEA J104842.58+054229.5 162.177419 5.708209 G 503.19 0.26 -- -- 12.87 0.12 11.58 0.01 7.66e-01 1.86e-03\nWISEA J105244.35+083824.6 163.184588 8.640342 G 657.01 0.07 -- -- 14.70 0.26 12.28 0.01 8.17e-01 1.77e-03\nWISEA J103801.57+055423.5 159.506543 5.906542 G 660.07 0.25 22.50 0.28 12.91 0.16 12.38 0.01 8.11e-01 1.62e-03\nWISEA J105109.13+103827.4 162.788059 10.640952 G 620.73 0.19 22.59 0.31 12.62 0.12 12.29 0.01 8.09e-01 1.56e-03\nWISEA J104327.94+054008.1 160.866315 5.668975 G 698.96 0.07 -- -- 14.38 0.17 12.62 0.01 8.64e-01 1.55e-03\nWISEA J110724.12+110315.3 166.850369 11.054323 G 504.49 -- -- -- 13.77 0.13 11.45 0.01 5.64e-01 1.55e-03\nWISEA J105417.15+104855.5 163.571487 10.815452 G 614.89 0.25 21.79 0.17 12.85 0.16 12.10 0.01 6.46e-01 1.45e-03\nWISEA J110654.65+131825.2 166.727741 13.307005 G 581.40 0.20 -- -- 13.18 0.11 12.11 0.01 7.03e-01 1.40e-03\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S240413p sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D*P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1).\n\n\n Galaxy ra dec objtype DistMpc DistMpc_unc m_NUV m_NUV_unc m_Ks m_Ks_unc m_W1 m_W1_unc P_3D P_3D_LumW1\n (Deg) (Deg) (Mpc) (AB) (Vega) (Vega) (Prob) (Prob)\n------------------------- ---------- --------- ------- ------- ----------- ----- --------- ----- -------- ----- -------- -------- ----------\nWISEA J110012.38+084616.3 165.051598 8.771199 QSO 465.07 0.07 18.35 0.02 12.32 0.09 10.79 0.01 8.51e-01 3.67e-03\nWISEA J104505.15+084339.0 161.271533 8.727526 QSO 587.14 0.05 17.99 0.03 13.22 0.08 11.39 0.02 7.91e-01 3.13e-03\nWISEA J110226.74+130704.3 165.611471 13.117866 QSO 611.32 0.17 -- -- 14.02 0.07 12.97 0.02 6.78e-01 6.73e-04\nWISEA J105555.34+110252.0 163.980621 11.047838 QSO 692.93 0.04 19.98 0.05 13.46 0.20 13.62 0.03 8.25e-01 5.78e-04\nWISEA J110550.53+112701.9 166.460584 11.450589 QSO 671.49 0.17 22.96 0.27 -- -- 14.50 0.03 7.41e-01 2.17e-04\nWISEA J105043.40+072500.1 162.680778 7.416794 QSO 624.79 3.07 -- -- -- -- 16.42 0.07 8.45e-01 3.67e-05\nWISEA J110206.66+112104.8 165.527787 11.351373 QSO 176.68 0.87 -- -- 14.92 0.28 14.59 0.03 9.00e-01 1.68e-05\nWISEA J105930.49+120532.7 164.877076 12.092448 QSO 443.25 0.70 -- -- -- -- 15.18 0.04 1.57e-01 1.07e-05\n\nTable 2: Candidates in the 90% volume with AGN/QSO classifications.\n\n\n\nThe NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic followup observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D*P_SFR; and specific star formation rate, P_3D*P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36076.",
"published": "2024-04-13T03:37:37.539947Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T03:37:37.539968Z",
"modified": "2024-04-13T03:37:37.548293Z",
"nonlocalizedevents": [
{
"event_id": "S240413p"
}
],
"targets": []
},
{
"id": 6519,
"topic": "gcn.circular",
"uuid": "2a26d7e2-43e2-4385-8f6a-bced33fa99d3",
"title": "GRB 240411B: Kinder observations with Lulin observatory",
"submitter": "Hop gcn.circular",
"authors": "Amar Aryan <amararyan941@gmail.com>",
"data": {
"date": "24/04/13 03:50:18 GMT",
"from": "Amar Aryan <amararyan941@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36077"
},
"title": "GCN CIRCULAR",
"number": "36077",
"subject": "GRB 240411B: Kinder observations with Lulin observatory"
},
"message_text": "A. Aryan, T.-W. Chen, C.-S. Lin, W.-J. Hou, A. Sankar.K, Y.-C. Pan (all NCUIA), S. Yang (HNAS), M.-H. Lee, C.-H. Lai, H.-Y. Hsiao, C.-C. Ngeow, H.-C. Lin, J.-K. Guo (all NCUIA), S. Srivastav (Oxford), M. Fulton, T. Moore, C. Angus, and A. Aamer (all QUB) report:\n\nWe observed the field of GRB 240411B (Parsotan et al., GCN 36063; Goad et al., GCN 36065; D'Avanzo et al., GCN 36071; Lien et al., GCN 36072) using the Lulin One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The optical afterglow candidate of GRB 240411B was identified (Izzo et al., GCN 36064) and followed with several instruments (Schneider et al., GCN 36067; Ror et al., GCN 36069).\n\nThe first LOT epoch of observations started at 16:45 UT on 11 of April 2024. We followed standard IRAF (Tody D., 1993, ASPC, 52, 173) procedure to reduce the images. Further, PSF photometry was performed using DAOPHOT II (Stetson P. B., 1987, PASP, 99, 191) software. The details of the observations and the preliminary magnitudes (in the AB system) of the afterglow are as follows:\n\nTelescope | Filter | MJD | t-t0 | Exposure | Magnitude | avg. Seeing | med. Airmass\nLOT | r | 60411.698 | 1.25 hrs | 300 sec * 1 | 20.92 +/- 0.12 | 1\".16 | 1.17\nLOT | i | 60411.715 | 1.65 hrs | 300 sec * 1 | 20.28 +/- 0.15 | 1\".0 | 1.13\n\nThe presented magnitudes are calibrated using the nearby stars from the PanSTARRS catalog and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.14 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36077.",
"published": "2024-04-13T03:50:34.754117Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T03:50:34.754132Z",
"modified": "2024-04-13T03:50:34.761976Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5579,
"topic": "gcn.circular",
"uuid": "fdef5f9a-ade8-4cd5-b79c-17181ac14fe4",
"title": "GRB 231210B: BOOTES-7 optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>",
"data": {
"date": "23/12/29 07:22:12 GMT",
"from": "Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35433"
},
"title": "GCN CIRCULAR",
"number": "35433",
"subject": "GRB 231210B: BOOTES-7 optical upper limit"
},
"message_text": "A. J. Castro-Tirado, Y.-D. Hu, E. Fernandez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia, S.-Y. Wu, S. Guziy  (IAA-CSIC Granada), C. Perez del Pulgar, A. Castellon, A. Reina (Univ. de Malaga), B.-B. Zhang (Nanjing Univ.) and A. Maury (Space, San Pedro de Atacama), report:\n\nFollowing the detection of GRB 231210B by Swift (Page et al., GCNC 35314) and Konus-Wind (Frederiks et al. GCNC 35359), the 0.6m BOOTES-7 robotic telescope at San Pedro de Atacama (Chile) pointed to the burst position on Dec. 21 at 01:32 UT (i.e. ~10.2 days after trigger). Images were gathered in different optical bands. In the co-added r-band image (8 x 300 s, SDSS-r filter), the optical afterglow reported by MASTER (Lipunov et al. GCNC 35313), UVOT (Page et al., GCNC 35314), LCOGT (Pérez-Fournon et al. GCNC 35316), VLT (Saccardi et al. GCNC 35317) and MeerLICHT (de Wet et al. GCNC 35323) is not detected within the enhanced Swift/XRT position (Beardmore et al. GCNC 35318) down to 21.0 mag, which is consistent with the REM results (Ferro et al. GCNC 35333).\n\nRegarding the source reported at the Greenhill Observatory (Siellez et al. GCNC 35406), we cannot clearly identify it since it is blended with a nearby and brighter star 0.4\" away. In any case, we notice that this object is present on the DESI catalog and it is far from the enhanced Swift/XRT position and therefore unrelated to GRB 231210B.\n\nBOOTES-7 is the last observatory completing the BOOTES Global Network of robotic telescopes in all the continents (Castro-Tirado 2023, Nat. Astron. 7, 1136), 25 years after the first astronomical station was deployed in south Spain.\n\nWe thank the staff at San Pedro de Atacama Celestial Explorations observatory for their excellent support.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35433.",
"published": "2023-12-29T07:22:28.256387Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-29T07:22:28.256403Z",
"modified": "2023-12-29T07:22:28.265178Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5594,
"topic": "gcn.circular",
"uuid": "71971493-c616-4050-b727-f1ad575384ad",
"title": "GRB 231230A: 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": "23/12/30 01:39:51 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35434"
},
"title": "GCN CIRCULAR",
"number": "35434",
"subject": "GRB 231230A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 01:29:10 UT on 30 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231230A (trigger 725592555.052228 / 231230062).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 240.7, Dec = 53.6 (J2000 degrees, equivalent to J2000 16h 02m, 53d 36'), with a statistical uncertainty of 5.2 degrees.\n\nThe angle from the Fermi LAT boresight is 157.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231230062/quicklook/glg_skymap_all_bn231230062.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/bn231230062/quicklook/glg_healpix_all_bn231230062.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231230062/quicklook/glg_lc_medres34_bn231230062.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35434.",
"published": "2023-12-30T01:40:08.776663Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T01:40:08.776689Z",
"modified": "2023-12-30T01:40:08.784867Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5595,
"topic": "gcn.circular",
"uuid": "011fe6ba-2bfc-40db-bbfc-e3d47f7f2415",
"title": "Swift GRB231230.06: 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": "23/12/30 01:39:58 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35435"
},
"title": "GCN CIRCULAR",
"number": "35435",
"subject": "Swift GRB231230.06: 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-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 GRB231230.06 (trigger No 1205319,16h 20m 47.28s , +58d 07m 12.0s, R=0.05) errorbox 12 sec after notice time and 68 sec after trigger time at 2023-12-30 01:30:17 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 54 deg. The sun altitude is -39.8 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB231230.06 errorbox 16 sec after notice time and 72 sec after trigger time at 2023-12-30 01:30:20 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 51 deg. The sun altitude is -34.0 deg.\n\nThe galactic latitude b = 42 deg., longitude l = 88 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#46177\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 73 | MASTER-Tavrida | C | 10 | 16.1 |\n 77 | MASTER-Kislovodsk | P- | 10 | 16.0 |\n 97 | MASTER-Kislovodsk | P- | 50 | 16.7 | Coadd\n 77 | MASTER-Kislovodsk | P| | 10 | 15.8 |\n 96 | MASTER-Tavrida | C | 20 | 17.7 |\n 100 | MASTER-Kislovodsk | P- | 20 | 16.3 |\n 100 | MASTER-Kislovodsk | P| | 20 | 16.0 |\n 122 | MASTER-Tavrida | C | 20 | 17.7 |\n 128 | MASTER-Kislovodsk | P- | 20 | 16.2 |\n 128 | MASTER-Kislovodsk | P| | 20 | 16.0 |\n 155 | MASTER-Tavrida | C | 30 | 17.7 |\n 161 | MASTER-Kislovodsk | P- | 30 | 16.6 |\n 206 | MASTER-Kislovodsk | P- | 120 | 17.3 | Coadd\n 161 | MASTER-Kislovodsk | P| | 30 | 16.5 |\n 196 | MASTER-Tavrida | C | 40 | 17.9 |\n 206 | MASTER-Kislovodsk | P- | 40 | 16.5 |\n 206 | MASTER-Kislovodsk | P| | 40 | 16.6 |\n 242 | MASTER-Tavrida | C | 40 | 17.9 |\n 259 | MASTER-Kislovodsk | P- | 50 | 16.6 |\n 259 | MASTER-Kislovodsk | P| | 50 | 16.5 |\n 294 | MASTER-Tavrida | C | 50 | 17.8 |\n 322 | MASTER-Kislovodsk | P- | 60 | 16.8 |\n 322 | MASTER-Kislovodsk | P| | 60 | 16.6 |\n 361 | MASTER-Tavrida | C | 70 | 18.3 |\n 444 | MASTER-Tavrida | C | 80 | 18.5 |\nFilter C is a clear (unfiltred) band.\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/35435.",
"published": "2023-12-30T01:40:08.793238Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T01:40:08.793252Z",
"modified": "2023-12-30T01:40:08.798016Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5596,
"topic": "gcn.circular",
"uuid": "e2e77541-c792-4801-ba0f-da640d8fbc6b",
"title": "GRB 231230A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/12/30 01:44:18 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35436"
},
"title": "GCN CIRCULAR",
"number": "35436",
"subject": "GRB 231230A: Swift detection of a burst"
},
"message_text": "\nM. J. Moss (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU),\nH. A. Krimm (NSF), A. Y. Lien (U Tampa), K. L. Page (U Leicester) and\nM. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 01:29:08 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231230A (trigger\u001205319). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 245.197, +58.120 which is\n RA(J2000) = 16h 20m 47s\n Dec(J2000) = +58d 07' 11\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a multi-peaked\nstructure with a duration of about 30 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 01:32:45.0 UT, 216.3 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source located at RA, Dec 245.21706, 58.12324 which is equivalent\nto:\n RA(J2000) = 16h 20m 52.09s\n Dec(J2000) = +58d 07' 23.7\"\nwith an uncertainty of 3.5 arcseconds (radius, 90% containment). This\nlocation is 39 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. We\ncannot determine whether the source is fading at the present time.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (1.31 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 4.3\n(+4.82/-3.83) x 10^21 cm^-2 (90% confidence).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 145 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\n0.015.\n\nBurst Advocate for this burst is M. J. Moss (mikejmoss3 AT gmail.com).\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35436.",
"published": "2023-12-30T01:44:25.367006Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T01:44:25.367023Z",
"modified": "2023-12-30T01:44:25.371903Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5597,
"topic": "gcn.circular",
"uuid": "d673bc24-e3d9-42a9-8ecb-a9b213a9cd3e",
"title": "GRB 231230A: Prompt enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/30 02:04:59 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35437"
},
"title": "GCN CIRCULAR",
"number": "35437",
"subject": "GRB 231230A: Prompt enhanced Swift-XRT position"
},
"message_text": "P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nUsing promptly downlinked XRT event data for GRB 231230A, we find an\nenhanced XRT position of the afterglow: RA, Dec: 245.21382, 58.12618\nwhich is equivalent to:\n RA (J2000) = 16 20 51.32\n Dec (J2000) = +58 07 34.2\nwith an uncertainty of 1.9 arcseconds (radius, 90% confidence).\nAnalysis of the promptly available data is online at\nhttp://www.swift.ac.uk/sper/1205319.\n\nPosition enhancement is is described by Goad et al. (2007, A&A, 476,\n1401) and Evans et al. (2009, MNRAS, 397, 1177).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35437.",
"published": "2023-12-30T02:05:10.795962Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T02:05:10.795978Z",
"modified": "2023-12-30T02:05:10.804479Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5598,
"topic": "gcn.circular",
"uuid": "8cc27695-21ca-4ca0-9f2f-a65d4841b8ef",
"title": "Fermi trigger No 725592555: 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": "23/12/30 02:31:08 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35438"
},
"title": "GCN CIRCULAR",
"number": "35438",
"subject": "Fermi trigger No 725592555: 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-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 GRB231230.06 (trigger No 725592555,16h 02m 48.00s , +53d 33m 36.0s, R=5.2) errorbox 27 sec after notice time and 67 sec after trigger time at 2023-12-30 01:30:17 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 54 deg. The sun altitude is -39.8 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231230.06 errorbox 31 sec after notice time and 70 sec after trigger time at 2023-12-30 01:30:20 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 51 deg. The sun altitude is -34.0 deg.\n\nThe galactic latitude b = 46 deg., longitude l = 83 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#46192\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 72 | 2023-12-30 01:30:17 | MASTER-Tavrida | (16h 17m 04.69s , +58d 19m 55.5s) | C | 10 | 16.1 |\n 76 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 43.99s , +58d 12m 56.6s) | P- | 10 | 16.0 |\n 96 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 44.00s , +58d 12m 56.4s) | P- | 50 | 16.7 | Coadd\n 296 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 44.02s , +58d 12m 56.4s) | P- | 450 | 18.1 | Coadd\n 76 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 50.60s , +57d 49m 40.1s) | P| | 10 | 15.8 |\n 94 | 2023-12-30 01:30:34 | MASTER-Tavrida | (16h 17m 00.75s , +58d 21m 06.8s) | C | 20 | 17.7 |\n 99 | 2023-12-30 01:30:38 | MASTER-Kislovodsk | (16h 20m 41.06s , +58d 14m 25.8s) | P- | 20 | 16.3 |\n 99 | 2023-12-30 01:30:38 | MASTER-Kislovodsk | (16h 20m 47.74s , +57d 51m 05.7s) | P| | 20 | 16.0 |\n 121 | 2023-12-30 01:31:01 | MASTER-Tavrida | (16h 17m 00.87s , +58d 19m 35.8s) | C | 20 | 17.7 |\n 127 | 2023-12-30 01:31:06 | MASTER-Kislovodsk | (16h 20m 40.99s , +58d 12m 52.9s) | P- | 20 | 16.2 |\n 127 | 2023-12-30 01:31:06 | MASTER-Kislovodsk | (16h 20m 47.67s , +57d 49m 30.9s) | P| | 20 | 16.0 |\n 153 | 2023-12-30 01:31:28 | MASTER-Tavrida | (16h 17m 02.82s , +58d 21m 12.3s) | C | 30 | 17.7 |\n 160 | 2023-12-30 01:31:34 | MASTER-Kislovodsk | (16h 20m 42.77s , +58d 14m 17.4s) | P- | 30 | 16.6 |\n 205 | 2023-12-30 01:31:34 | MASTER-Kislovodsk | (16h 20m 42.79s , +58d 14m 17.4s) | P- | 120 | 17.3 | Coadd\n 160 | 2023-12-30 01:31:34 | MASTER-Kislovodsk | (16h 20m 49.48s , +57d 50m 53.6s) | P| | 30 | 16.5 |\n 194 | 2023-12-30 01:32:04 | MASTER-Tavrida | (16h 16m 57.77s , +58d 20m 30.2s) | C | 40 | 17.9 |\n 205 | 2023-12-30 01:32:15 | MASTER-Kislovodsk | (16h 20m 38.05s , +58d 13m 34.8s) | P- | 40 | 16.5 |\n 205 | 2023-12-30 01:32:15 | MASTER-Kislovodsk | (16h 20m 44.77s , +57d 50m 10.1s) | P| | 40 | 16.6 |\n 241 | 2023-12-30 01:32:51 | MASTER-Tavrida | (16h 16m 57.61s , +58d 21m 31.8s) | C | 40 | 17.9 |\n 258 | 2023-12-30 01:33:02 | MASTER-Kislovodsk | (16h 20m 36.90s , +58d 14m 34.1s) | P- | 50 | 16.6 |\n 258 | 2023-12-30 01:33:02 | MASTER-Kislovodsk | (16h 20m 43.71s , +57d 51m 08.3s) | P| | 50 | 16.5 |\n 293 | 2023-12-30 01:33:38 | MASTER-Tavrida | (16h 17m 04.48s , +58d 20m 32.5s) | C | 50 | 17.8 |\n 321 | 2023-12-30 01:34:01 | MASTER-Kislovodsk | (16h 20m 42.65s , +58d 13m 34.1s) | P- | 60 | 16.8 |\n 431 | 2023-12-30 01:34:01 | MASTER-Kislovodsk | (16h 20m 42.67s , +58d 13m 34.2s) | P- | 280 | 17.8 | Coadd\n 321 | 2023-12-30 01:34:01 | MASTER-Kislovodsk | (16h 20m 49.59s , +57d 50m 08.0s) | P| | 60 | 16.6 |\n 359 | 2023-12-30 01:34:34 | MASTER-Tavrida | (16h 16m 56.53s , +58d 19m 34.4s) | C | 70 | 18.3 |\n 395 | 2023-12-30 01:35:09 | MASTER-Kislovodsk | (16h 20m 37.78s , +58d 12m 35.3s) | P- | 70 | 17.3 |\n 395 | 2023-12-30 01:35:09 | MASTER-Kislovodsk | (16h 20m 44.75s , +57d 49m 07.7s) | P| | 70 | 16.6 |\n 443 | 2023-12-30 01:35:52 | MASTER-Tavrida | (16h 17m 03.59s , +58d 19m 57.0s) | C | 80 | 18.5 |\n 540 | 2023-12-30 01:37:20 | MASTER-Tavrida | (16h 17m 00.09s , +58d 21m 22.3s) | C | 100 | 18.5 |\n 636 | 2023-12-30 01:38:46 | MASTER-Kislovodsk | (16h 02m 27.05s , +53d 39m 50.5s) | C | 120 | 17.6 |\n 636 | 2023-12-30 01:38:46 | MASTER-Kislovodsk | (16h 09m 07.97s , +53d 16m 19.9s) | C | 120 | 17.6 |\n 657 | 2023-12-30 01:39:07 | MASTER-Tavrida | (16h 17m 00.01s , +58d 20m 00.6s) | C | 120 | 18.7 |\n 786 | 2023-12-30 01:41:06 | MASTER-Kislovodsk | (16h 02m 33.80s , +53d 38m 53.9s) | C | 140 | 17.7 |\n 786 | 2023-12-30 01:41:06 | MASTER-Kislovodsk | (16h 09m 14.75s , +53d 15m 23.7s) | C | 140 | 17.8 |\n 801 | 2023-12-30 01:41:15 | MASTER-Tavrida | (16h 17m 02.18s , +58d 21m 19.6s) | C | 150 | 18.7 |\n 975 | 2023-12-30 01:43:54 | MASTER-Tavrida | (16h 16m 55.78s , +58d 20m 46.6s) | C | 180 | 18.7 |\n 1038 | 2023-12-30 01:45:13 | MASTER-Kislovodsk | (16h 20m 48.34s , +58d 11m 29.1s) | P- | 150 | 17.5 |\n 1038 | 2023-12-30 01:45:13 | MASTER-Kislovodsk | (16h 20m 50.95s , +57d 48m 26.9s) | P| | 150 | 17.0 |\n 1162 | 2023-12-30 01:47:01 | MASTER-Tavrida | (16h 16m 54.97s , +58d 21m 49.8s) | C | 180 | 18.6 |\n 1211 | 2023-12-30 01:47:51 | MASTER-Kislovodsk | (16h 20m 46.41s , +58d 12m 57.8s) | P- | 180 | 17.8 |\n 1391 | 2023-12-30 01:47:51 | MASTER-Kislovodsk | (16h 20m 46.42s , +58d 12m 57.7s) | P- | 540 | 18.3 | Coadd\n 1211 | 2023-12-30 01:47:51 | MASTER-Kislovodsk | (16h 20m 48.30s , +57d 50m 04.0s) | P| | 180 | 17.0 |\n 1350 | 2023-12-30 01:50:10 | MASTER-Tavrida | (16h 17m 02.26s , +58d 20m 52.3s) | C | 180 | 18.5 |\n 1412 | 2023-12-30 01:51:12 | MASTER-Kislovodsk | (16h 20m 46.25s , +58d 11m 36.8s) | P- | 180 | 17.8 |\n 1412 | 2023-12-30 01:51:12 | MASTER-Kislovodsk | (16h 20m 48.31s , +57d 48m 43.3s) | P| | 180 | 17.0 |\n 1537 | 2023-12-30 01:53:16 | MASTER-Tavrida | (16h 16m 56.20s , +58d 19m 55.3s) | C | 180 | 18.8 |\n 1725 | 2023-12-30 01:56:24 | MASTER-Tavrida | (16h 17m 00.90s , +58d 20m 22.4s) | C | 180 | 18.8 |\n 1813 | 2023-12-30 01:57:53 | MASTER-Kislovodsk | (16h 20m 43.05s , +58d 12m 28.9s) | P- | 180 | 17.3 |\n 1813 | 2023-12-30 01:57:53 | MASTER-Kislovodsk | (16h 20m 45.55s , +57d 49m 38.0s) | P| | 180 | 16.8 |\n 1912 | 2023-12-30 01:59:31 | MASTER-Tavrida | (16h 16m 57.52s , +58d 21m 49.8s) | C | 180 | 18.5 |\n 2014 | 2023-12-30 02:01:13 | MASTER-Kislovodsk | (16h 20m 42.70s , +58d 13m 37.3s) | P- | 180 | 17.8 |\n 2194 | 2023-12-30 02:01:13 | MASTER-Kislovodsk | (16h 20m 42.72s , +58d 13m 37.3s) | P- | 540 | 18.4 | Coadd\n 2014 | 2023-12-30 02:01:13 | MASTER-Kislovodsk | (16h 20m 45.48s , +57d 50m 46.9s) | P| | 180 | 17.0 |\n 2099 | 2023-12-30 02:02:38 | MASTER-Tavrida | (16h 16m 57.22s , +58d 20m 31.9s) | C | 180 | 18.4 |\n 2214 | 2023-12-30 02:04:34 | MASTER-Kislovodsk | (16h 20m 47.65s , +58d 12m 41.9s) | P- | 180 | 17.8 |\n 2214 | 2023-12-30 02:04:34 | MASTER-Kislovodsk | (16h 20m 50.49s , +57d 49m 53.0s) | P| | 180 | 17.2 |\n 2288 | 2023-12-30 02:05:48 | MASTER-Tavrida | (16h 16m 58.89s , +58d 21m 45.0s) | C | 180 | 18.5 |\n 2417 | 2023-12-30 02:07:56 | MASTER-Kislovodsk | (16h 20m 41.31s , +58d 11m 47.9s) | P- | 180 | 17.8 |\n 2417 | 2023-12-30 02:07:56 | MASTER-Kislovodsk | (16h 20m 44.33s , +57d 48m 59.3s) | P| | 180 | 17.1 |\n 2476 | 2023-12-30 02:08:56 | MASTER-Tavrida | (16h 16m 53.16s , +58d 21m 09.6s) | C | 180 | 18.1 |\n 2617 | 2023-12-30 02:11:17 | MASTER-Kislovodsk | (16h 20m 47.85s , +58d 11m 55.1s) | P- | 180 | 18.0 |\n 2797 | 2023-12-30 02:11:17 | MASTER-Kislovodsk | (16h 20m 47.85s , +58d 11m 55.1s) | P- | 540 | 18.5 | Coadd\n 2617 | 2023-12-30 02:11:17 | MASTER-Kislovodsk | (16h 20m 51.03s , +57d 49m 06.2s) | P| | 180 | 17.3 |\n 2666 | 2023-12-30 02:12:05 | MASTER-Tavrida | (16h 16m 52.37s , +58d 22m 12.4s) | C | 180 | 17.8 |\n 2818 | 2023-12-30 02:14:37 | MASTER-Kislovodsk | (16h 20m 44.88s , +58d 13m 36.8s) | P- | 180 | 18.0 |\n 2818 | 2023-12-30 02:14:37 | MASTER-Kislovodsk | (16h 20m 48.14s , +57d 50m 48.0s) | P| | 180 | 17.0 |\n 2855 | 2023-12-30 02:15:14 | MASTER-Tavrida | (16h 16m 59.67s , +58d 21m 14.6s) | C | 180 | 18.0 |\n 3018 | 2023-12-30 02:17:58 | MASTER-Kislovodsk | (16h 20m 44.67s , +58d 12m 30.2s) | P- | 180 | 17.8 |\n 3018 | 2023-12-30 02:17:58 | MASTER-Kislovodsk | (16h 20m 48.19s , +57d 49m 42.7s) | P| | 180 | 17.2 |\n 3042 | 2023-12-30 02:18:21 | MASTER-Tavrida | (16h 16m 52.55s , +58d 20m 17.3s) | C | 180 | 18.2 |\n 3219 | 2023-12-30 02:21:18 | MASTER-Kislovodsk | (16h 20m 47.36s , +58d 13m 49.8s) | P- | 180 | 17.7 |\n 3219 | 2023-12-30 02:21:19 | MASTER-Kislovodsk | (16h 20m 51.23s , +57d 51m 02.1s) | P| | 180 | 17.0 |\n 3229 | 2023-12-30 02:21:29 | MASTER-Tavrida | (16h 16m 57.32s , +58d 20m 28.7s) | C | 180 | 18.2 |\nFilter C is a clear (unfiltred) band.\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/35438.",
"published": "2023-12-30T02:31:18.898879Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T02:31:18.898898Z",
"modified": "2023-12-30T02:31:18.911421Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6859,
"topic": "gcn.circular",
"uuid": "e15fccb8-6c48-4255-a48e-75504a807c9a",
"title": "LIGO/Virgo/KAGRA S240422ed: Magellan Observations",
"submitter": "Hop gcn.circular",
"authors": "Ryan Foley at UC Santa Cruz <foley@ucsc.edu>",
"data": {
"date": "24/04/23 06:02:25 GMT",
"from": "Ryan Foley at UC Santa Cruz <foley@ucsc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36244"
},
"title": "GCN CIRCULAR",
"number": "36244",
"subject": "LIGO/Virgo/KAGRA S240422ed: Magellan Observations"
},
"message_text": "A. L. Piro, J. D. Simon (Carnegie), D. A. Coulter (STScI), M. R. Drout (Toronto), R. J. Foley, C. Rojas-Bravo (UC Santa Cruz), and C. D. Kilpatrick (Northwestern)\n\nreport on behalf of the Carnegie Gravitational wave ElectroMagnetic follow-up (CGEM) and the One-Meter Two-Hemisphere (1M2H) collaborations:\n\nWe have carried out a search for optical counterparts to the candidate gravitational wave event S240422ed (GCN 36236) using the 6.5m Magellan Clay telescope with the LDSS-3 imager. We obtained a series of 120-second i-band images targeting galaxies coincident with the 3D localization of the event. We performed a preliminary search of the data by comparing to archival Pan-STARRS images (Chambers et al., 2016), and found no obvious transient sources near the targeted galaxies. However, we note that several images were deeper than the comparison images, precluding the exclusion of some faint sources detected in only the new images as transient sources. The images have depths of ~21.5-22.5 mag.\n\nWe thank Marcelo Mora, Povilas Palunas, and the rest of the LCO staff for making these observations possible.\n\nBelow we provide a list of targeted galaxies and observation details.\n\nRA Dec UT Start\n07:57:41.8 -21:53:13.0 02:23:13\n07:58:18.6 -20:40:09.0 02:27:51\n07:58:40.1 -22:05:11.2 02:31:38\n08:01:16.7 -18:22:40.8 02:35:44\n08:02:23.4 -24:51:17.0 02:40:00\n08:03:56.2 -22:45:18.4 02:43:47\n08:04:28.2 -27:42:48.7 02:48:55\n08:04:54.4 -28:09:41.9 02:54:24\n08:05:26.0 -19:52:40.6 02:59:32\n08:06:04.3 -22:27:12.0 03:04:27\n08:10:04.0 -18:02:03.4 03:08:18\n08:11:02.4 -17:01:51.3 03:13:31\n08:12:16.7 -21:47:19.0 03:19:43\n08:14:21.3 -15:28:23.3 03:23:25\n08:14:21.8 -15:47:45.0 03:28:12\n08:15:29.1 -15:44:02.8 03:31:46\n07:52:28.3 -25:55:07.2 03:37:25\n07:59:52.7 -19:47:48.0 03:40:36\n08:00:19.3 -22:25:39.2 03:43:33\n08:02:56.1 -17:38:41.8 03:46:27\n08:03:05.4 -22:41:00.1 03:49:44\n08:05:31.0 -22:40:00.2 03:52:28\n08:09:15.2 -18:39:53.0 03:55:21\n08:16:33.6 -20:39:43.8 03:58:10\n08:18:00.6 -16:13:59.5 04:01:00\n08:26:19.2 -20:50:51.5 04:03:40\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36244.",
"published": "2024-04-23T06:02:42.149189Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-23T06:02:42.149210Z",
"modified": "2024-04-23T06:02:42.158741Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"targets": []
},
{
"id": 6522,
"topic": "gcn.circular",
"uuid": "546e4c2a-dae5-4a2e-9ee0-2911948c8d10",
"title": "GRB 240411B: CrAO/ZTSh optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
"data": {
"date": "24/04/13 07:42:11 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36078"
},
"title": "GCN CIRCULAR",
"number": "36078",
"subject": "GRB 240411B: CrAO/ZTSh optical observations"
},
"message_text": " N. Pankov (HSE,IKI), V. Rumyantsev (CrAO), A. Pozanenko (IKI), S. Belkin\n(IKI) report on behalf of IKI GRB FuN:\n\nWe observed the field of GRB 240411B (Parsotan et al., GCN 36063; Goad et\nal., GCN 36065; D'Avanzo et al., GCN 36071; Lien et al., GCN 36072) with\nZTSh 2.6m telescope of CrAO observatory starting on 2024-04-11 (UT)\n21:18:47. We detect optical afterglow (Izzo et al. GCN 36064; Schneider et\nal. GCN 36067; Ror et al. GCN 36069; Ugarte Postigo et al. GCN 36074; Aryan\net al. GCN 36077).\n\nPreliminary photometry of the afterglow in a combined image is following\n\nDate UT start t-T0 Filter Exp. OT err UL(3sigma)\n(mid, days) (s)\n2024-04-11 21:18:47 0.283257 R 60*120 22.40 0.25 22.8\n\nThe photometry is based on several nearby USNO-B1.0 (R2) stars\nUSNO-B1.0\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36078.",
"published": "2024-04-13T07:42:29.442883Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T07:42:29.442902Z",
"modified": "2024-04-13T07:42:29.449504Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5607,
"topic": "gcn.circular",
"uuid": "ea405e95-4c18-45e0-ae23-5244fc6f4d6a",
"title": "GRB 231230A: NOT optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Zipei Zhu at NAOC <zpzhu@nao.cas.cn>",
"data": {
"date": "23/12/30 09:03:02 GMT",
"from": "Zipei Zhu at NAOC <zpzhu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35439"
},
"title": "GCN CIRCULAR",
"number": "35439",
"subject": "GRB 231230A: NOT optical upper limits"
},
"message_text": "Z. Zhu, D. Xu (NAOC) report on behalf a larger collaboration:\n\nWe observed the position of GRB 231230A (Moss et al., GCN 35436) using the Nordic Optical Telescope equipped with the ALFOSC images. Observations were carried out with the SDSS r and z filters, with an exposure time of 3x300 s and 5x200 s respectively.\n\nNo new objects were dectected in our stacked image within or around the enhanced XRT position (Evans et al., GCN 35437), down to magnitudes r > 23.4 @ T-mid = 4.02 hr and z > 22.7 @ T-mid = 4.32 hr, calibrated with the nearby Pan-STARRS field.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35439.",
"published": "2023-12-30T09:03:17.768577Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T09:03:17.768594Z",
"modified": "2023-12-30T09:03:17.777990Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5609,
"topic": "gcn.circular",
"uuid": "edfc9db7-85ed-4ec5-9e5b-464c1b693d64",
"title": "GRB 231230A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "23/12/30 11:25:57 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35440"
},
"title": "GCN CIRCULAR",
"number": "35440",
"subject": "GRB 231230A: Swift/UVOT Upper Limits"
},
"message_text": "N. P. M. Kuin (UCL-MSSL) and M. J. Moss (GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231230A\n1511 s after the BAT trigger (Moss et al., GCN Circ. 35436).\nNo optical afterglow consistent with the XRT position\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 initial exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 1511 1705 39 >18.9\nb 1661 1681 19 >18.5\nw1 1612 1632 19 >18.0\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35440.",
"published": "2023-12-30T11:26:08.019710Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T11:26:08.019730Z",
"modified": "2023-12-30T11:26:08.030122Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5610,
"topic": "gcn.circular",
"uuid": "3f1d6157-17a9-4407-8574-5dcb17191736",
"title": "GRB 231230A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/30 12:12:48 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35441"
},
"title": "GCN CIRCULAR",
"number": "35441",
"subject": "GRB 231230A: 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 2051 s of XRT Photon Counting mode data and 3 UVOT\nimages for GRB 231230A, 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 = 245.21436, +58.12396 which is equivalent\nto:\n\nRA (J2000): 16h 20m 51.45s\nDec (J2000): +58d 07' 26.2\"\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35441.",
"published": "2023-12-30T12:12:58.661780Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T12:12:58.661805Z",
"modified": "2023-12-30T12:12:58.671756Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6525,
"topic": "gcn.circular",
"uuid": "55f3a3b2-ee1c-4155-b2fa-c6aa78249826",
"title": "EP240408a: GSP optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Wenxiong Li <liwenxiong1992@gmail.com>",
"data": {
"date": "24/04/13 09:09:26 GMT",
"from": "Wenxiong Li <liwenxiong1992@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36079"
},
"title": "GCN CIRCULAR",
"number": "36079",
"subject": "EP240408a: GSP optical upper limit"
},
"message_text": "W. X. Li, S. J. Xue, D. Xu (NAOC), M. Andrews, J. Farrah, D. A. Howell, M. Newsome, E. Padilla Gonzalez, C. McCully, and G. Terreran (Las Cumbres Observatory), on behalf of a larger collaboration, report:\nFollowing the detection of the fast X-ray transient EP240408a by the Einstein Probe (Hu et al. GCN 36053), we initiated observations of the fast X-ray transient location starting on April 9 at 10:46 UT (~17 hours after the trigger) in the r band. These observations were conducted using the 1-meter telescope at the Las Cumbres Observatory node located at Siding Spring Observatory in Australia.\nWe report that no new optical source was detected in the co-added images within the EP/WXT error box down to ~21.5 mag.\nThese observations were taken as part of the Global Supernova Project.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36079.",
"published": "2024-04-13T09:09:45.207214Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T09:09:45.207236Z",
"modified": "2024-04-13T09:09:45.248692Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5611,
"topic": "gcn.circular",
"uuid": "af545c11-dc32-492a-8e1c-0877cf553257",
"title": "GRB 231230A: GOTO optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Amit Kumar at University of Warwick, UK <amitkundu515@gmail.com>",
"data": {
"date": "23/12/30 12:19:49 GMT",
"from": "Amit Kumar at University of Warwick, UK <amitkundu515@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35442"
},
"title": "GCN CIRCULAR",
"number": "35442",
"subject": "GRB 231230A: GOTO optical upper limits"
},
"message_text": "A. Kumar; B. P. Gompertz; G. Ramsay; R. Starling; K. Ulaczyk; K. Ackley; M. J. Dyer; J. Lyman; F. Jimenez-Ibarra; D. O'Neill; D. Steeghs; D. K. Galloway; V. Dhillon; P. O'Brien; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nThe Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022) performed a targeted observation in response to Fermi and Swift detected GRB 231230A (Fermi GBM Team, GCN 35434; Moss et al., GCN 35436) at 05:32:28; 05:47:36 and 06:40:25 UT on 2023-12-30 (at respectively ~4.1, 4.3 and 5.2 hours after the trigger). Each set of observations consisted of 4x90s exposures in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. No optical counterpart is detected within the enhanced Swift-XRT position (Evans et al., GCN 35437; Osborne et al., GCN 35441) in any of the three sets of observations up to the 5-sigma limits of L > 18.7, 19.0 and 19.5 magnitudes (AB), respectively. The upper limits are consistent with those reported by Zhu et al., GCN 35439 and Kuin et al., GCN 35440.\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35442.",
"published": "2023-12-30T12:19:59.523121Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T12:19:59.523139Z",
"modified": "2023-12-30T12:19:59.531676Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5614,
"topic": "gcn.circular",
"uuid": "5da17769-31e4-45cc-9d1d-c3824e393436",
"title": "GRB 231230A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/30 16:44:29 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35443"
},
"title": "GCN CIRCULAR",
"number": "35443",
"subject": "GRB 231230A: Swift-XRT refined Analysis"
},
"message_text": "A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), K.L.\nPage (U. Leicester), A.P. Beardmore (U. Leicester), R. Brivio\n(INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR) and P.A.\nEvans report on behalf of the Swift-XRT team:\n\nWe have analysed 9.1 ks of XRT data for GRB 231230A, from 127 s to 41.2\nks after the BAT trigger. The data comprise 68 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.\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=0.835 (+0.027, -0.028), followed by a break at T+17.4 ks\nto an alpha of 2.0 (+/-0.4).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.93 (+/-0.13). The\nbest-fitting absorption column is 4.0 (+0.7, -0.6) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.3 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 4.1 x 10^-11 (6.1 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 4.0 (+0.7, -0.6) x 10^21 cm^-2\nGalactic foreground: 1.3 x 10^20 cm^-2\nExcess significance: 9.9 sigma\nPhoton index:\t 1.93 (+/-0.13)\n\nIf the light curve continues to decay with a power-law decay index of\n2.0, the count rate at T+24 hours will be 5.1 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.1 x\n10^-13 (3.1 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/01205319.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35443.",
"published": "2023-12-30T16:44:44.175010Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T16:44:44.175028Z",
"modified": "2023-12-30T16:44:44.184386Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5621,
"topic": "gcn.circular",
"uuid": "4d70ab58-45b7-4486-9dbf-7393523cf9d2",
"title": "GRB231230A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"data": {
"date": "23/12/30 18:40:14 GMT",
"from": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35444"
},
"title": "GCN CIRCULAR",
"number": "35444",
"subject": "GRB231230A: Fermi GBM Observation"
},
"message_text": "C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 01:29:10.05 UT on 30 December 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB231230A (trigger 725592555/231230062).\nwhich was also detected by Swift-BAT (Moss et al. 2023, GCN 35436).\nThe Fermi GBM Real-time Localization (GCN 35434) is consistent with the Swift-BAT position.\n\nThe angle from the Fermi LAT boresight is 157 degrees.\n\nThe GBM light curve consists of multiple spikes with a duration (T90)\nof about 17 s (50-300 keV). The time-averaged spectrum\nfrom T0-2.6 to T0+17.9 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 220 +/- 40 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.1 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+9.3 s in the 10-1000 keV band is 5 +/- 1 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35444.",
"published": "2023-12-30T18:40:24.617441Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-30T18:40:24.617459Z",
"modified": "2023-12-30T18:40:24.624155Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5635,
"topic": "gcn.circular",
"uuid": "bd33dfdd-4eca-4c84-81ce-b225be209a13",
"title": "LIGO/Virgo/KAGRA S231231ag: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Keita Kawabe at LIGO Hanford <kkawabe@caltech.edu>",
"data": {
"date": "23/12/31 16:10:22 GMT",
"from": "Keita Kawabe at LIGO Hanford <kkawabe@caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35445"
},
"title": "GCN CIRCULAR",
"number": "35445",
"subject": "LIGO/Virgo/KAGRA S231231ag: 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 S231231ag during real-time processing of data from LIGO Hanford Observatory (H1) at 2023-12-31 15:40:16.670 UTC (GPS time: 1388072434.670). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS231231ag is an event of interest because its false alarm rate, as estimated by the online analysis, is 8.4e-15 Hz, or about one in 1e7 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231231ag\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\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 27 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 24218 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1114 +/- 357 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/35445.",
"published": "2023-12-31T16:10:39.653884Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-31T16:10:39.653899Z",
"modified": "2023-12-31T16:10:39.660213Z",
"nonlocalizedevents": [
{
"event_id": "S231231a"
}
],
"targets": []
},
{
"id": 5643,
"topic": "gcn.circular",
"uuid": "402462f6-22db-4de9-8ffc-b157afe82846",
"title": "LIGO/Virgo/KAGRA S231231ag: Updated Sky localization and Source Classification",
"submitter": "Hop gcn.circular",
"authors": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"data": {
"date": "23/12/31 22:52:04 GMT",
"from": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35446"
},
"title": "GCN CIRCULAR",
"number": "35446",
"subject": "LIGO/Virgo/KAGRA S231231ag: Updated Sky localization and 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) data around the time of the compact binary merger (CBC) candidate S231231ag (GCN Circular 35445). 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/S231231ag\n\nAfter parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 27061 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1066 +/- 339 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) and Morisaki et al. arXiv:2307.13380 (2023)\n [2] Rose et al. arXiv:2201.05263 (2022) and Pankow et al. PRD 92, 023002 (2015)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35446.",
"published": "2023-12-31T22:52:16.731145Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-31T22:52:16.731160Z",
"modified": "2023-12-31T22:52:16.738926Z",
"nonlocalizedevents": [
{
"event_id": "S231231a"
}
],
"targets": []
},
{
"id": 5804,
"topic": "gcn.circular",
"uuid": "343abbc2-b2a5-4af3-8deb-0caa45ab444c",
"title": "GRB 240112C: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/15 10:57:59 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35536"
},
"title": "GCN CIRCULAR",
"number": "35536",
"subject": "GRB 240112C: 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, L. Szakszonova, 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.), T. 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 240112C (Swift/BAT detection: GCN 35522; Fermi/GBM detection: GCN 35533; INTEGRAL/SPI-ACS detection: trigger no. 10466; Konus/Wind trigger at 2024-01-12 17:37:21.633 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2024-01-12 17:37:25 UTC. The T90 duration measured by GRBAlpha is 5 s and the overall significance during T90 reaches 12 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240112C_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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35536.",
"published": "2024-01-15T10:58:15.164810Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T10:58:15.164825Z",
"modified": "2024-01-15T10:58:15.172575Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5652,
"topic": "gcn.circular",
"uuid": "cc876408-5f2c-4f4d-8caf-e30315bd366a",
"title": "Fermi trigger No 725806648: 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": "24/01/01 13:16:02 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35447"
},
"title": "GCN CIRCULAR",
"number": "35447",
"subject": "Fermi trigger No 725806648: 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-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 GRB240101.54 (trigger No 725806648,00h 02m 38.40s , +32d 10m 48.0s, R=4.6) errorbox 40 sec after notice time and 51 sec after trigger time at 2024-01-01 12:58:15 UT, with upper limit up to 19.6 mag. The observations began at zenith distance = 34 deg. The sun altitude is -34.6 deg.\n\nThe galactic latitude b = -29 deg., longitude l = 112 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#47947\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 57 | 2024-01-01 12:58:15 | MASTER-Tunka | (00h 00m 36.90s , +32d 16m 39.5s) | C | 10 | 18.6 |\n 77 | 2024-01-01 12:58:15 | MASTER-Tunka | (00h 00m 36.90s , +32d 16m 39.6s) | C | 50 | 19.6 | Coadd\n 137 | 2024-01-01 12:58:15 | MASTER-Tunka | (00h 00m 36.90s , +32d 16m 39.6s) | C | 170 | 19.3 | Coadd\n 91 | 2024-01-01 12:58:44 | MASTER-Tunka | (00h 00m 29.45s , +32d 15m 44.2s) | C | 20 | 19.0 |\n 119 | 2024-01-01 12:59:12 | MASTER-Tunka | (00h 00m 29.93s , +32d 16m 44.3s) | C | 20 | 18.8 |\n 152 | 2024-01-01 12:59:41 | MASTER-Tunka | (00h 00m 36.93s , +32d 15m 44.5s) | C | 30 | 19.0 |\n 197 | 2024-01-01 12:59:41 | MASTER-Tunka | (00h 00m 36.93s , +32d 15m 44.3s) | C | 120 | 18.9 | Coadd\n 196 | 2024-01-01 13:00:19 | MASTER-Tunka | (00h 00m 29.28s , +32d 14m 45.2s) | C | 40 | 18.2 |\n 250 | 2024-01-01 13:01:08 | MASTER-Tunka | (00h 00m 35.14s , +32d 14m 57.1s) | C | 50 | 18.3 |\n 313 | 2024-01-01 13:02:06 | MASTER-Tunka | (00h 00m 32.83s , +32d 16m 26.7s) | C | 60 | 18.7 |\n 381 | 2024-01-01 13:03:14 | MASTER-Tunka | (00h 00m 32.67s , +32d 15m 15.9s) | C | 60 | 18.7 |\n 468 | 2024-01-01 13:04:41 | MASTER-Tunka | (23h 53m 15.78s , +29d 47m 09.9s) | C | 60 | 18.2 |\nFilter C is a clear (unfiltred) band.\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/35447.",
"published": "2024-01-01T13:16:18.233673Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-01T13:16:18.233695Z",
"modified": "2024-01-01T13:16:18.245068Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5653,
"topic": "gcn.circular",
"uuid": "8d6ed20d-a89e-4d2c-89e0-8daff06c35a9",
"title": "GRB 240101A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/01/01 14:45:57 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35448"
},
"title": "GCN CIRCULAR",
"number": "35448",
"subject": "GRB 240101A: Swift detection of a burst"
},
"message_text": "\nS. B. Cenko (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU) and\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nThe Swift Burst Alert Telescope (BAT) triggered and located GRB 240101A\n(trigger\u001205708), and Swift has slewed to this burst. The trigger time is\nbelieved to be no earlier than 12:52 UT. Given the loss of some of the TDRSS\nnotices, we will not have values for T0 or the BAT Position until the\nfull data have been downloaded, in approximately 1.25 hours (by around 16:05\nUT).\n\nUsing promptly downlinked data we find an uncatalogued X-ray source\nwith an enhanced position: RA, Dec 10.34819, 8.51706 which is\nequivalent to:\n RA(J2000) = 00h 41m 23.57s\n Dec(J2000) = +08d 31' 01.4\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nposition may be improved as more data are received; the latest position\nis 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 (5.84 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 1.1\n(+0.67/-0.52) x 10^22 cm^-2 (90% confidence).\n\nNo afterglow is detected in the initial UVOT data products.\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35448.",
"published": "2024-01-01T14:46:14.122514Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-01T14:46:14.122529Z",
"modified": "2024-01-01T14:46:14.130559Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5654,
"topic": "gcn.circular",
"uuid": "8ce5cde7-a362-42e1-be2c-8e163eaf2a2b",
"title": "GRB 240101B: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/01/01 20:42:28 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35449"
},
"title": "GCN CIRCULAR",
"number": "35449",
"subject": "GRB 240101B: Swift detection of a burst"
},
"message_text": "\nS. B. Cenko (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU),\nH. A. Krimm (NSF), A. Y. Lien (U Tampa) and K. L. Page (U Leicester)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 20:25:39 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240101B (trigger\u001205744). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 352.052, +51.645 which is\n RA(J2000) = 23h 28m 12s\n Dec(J2000) = +51d 38' 43\"\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 20 sec. The peak count rate\nwas ~600 counts/sec (15-350 keV), at ~7 sec after the trigger.\n\nThe XRT began observing the field at 20:27:43.2 UT, 123.9 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 352.0966, 51.6379 which is equivalent to:\n RA(J2000) = 23h 28m 23.18s\n Dec(J2000) = +51d 38' 16.4\"\nwith an uncertainty of 5.1 arcseconds (radius, 90% containment). This\nlocation is 102 arcseconds from the BAT onboard position, within the\nBAT error circle.\n\nThe initial flux in the 2.5 s image was 2.19e-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 134 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\n0.286.\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35449.",
"published": "2024-01-01T20:42:41.297531Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-01T20:42:41.297546Z",
"modified": "2024-01-01T20:42:41.304097Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5655,
"topic": "gcn.circular",
"uuid": "d083057b-5298-49ec-87b1-8de59e7021d4",
"title": "Swift GRB240101.85: 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": "24/01/01 22:12:46 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35450"
},
"title": "GCN CIRCULAR",
"number": "35450",
"subject": "Swift GRB240101.85: 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-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 GRB240101.85 (trigger No 1205744,23h 28m 12.48s , +51d 38m 42.0s, R=0.05) errorbox 2999 sec after notice time and 3077 sec after trigger time at 2024-01-01 21:16:57 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 63 deg. The sun altitude is -68.2 deg.\n\nThe galactic latitude b = -9 deg., longitude l = 110 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#48073\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 3168 | MASTER-Tavrida | C | 180 | 14.8 |\n 5973 | MASTER-Tavrida | C | 180 | 16.5 |\nFilter C is a clear (unfiltred) band.\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/35450.",
"published": "2024-01-01T22:12:55.488183Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-01T22:12:55.488199Z",
"modified": "2024-01-01T22:12:55.494012Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6533,
"topic": "gcn.circular",
"uuid": "9e259c34-0f9f-45a5-a60b-058f80103f3b",
"title": "LIGO/Virgo/KAGRA S240413p: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Utkarsh Pathak at IIT Bombay <utkarshpathak.07@gmail.com>",
"data": {
"date": "24/04/13 19:07:58 GMT",
"from": "Utkarsh Pathak at IIT Bombay <utkarshpathak.07@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36080"
},
"title": "GCN CIRCULAR",
"number": "36080",
"subject": "LIGO/Virgo/KAGRA S240413p: Zwicky Transient Facility observations"
},
"message_text": "Vishwajeet Swain (IITB), Utkarsh Pathak (IITB), Viraj Karambelkar (Caltech), Theophile Jegou du Laz (Caltech), Tomas Ahumada (Caltech), Shreya Anand (Caltech), Igor Andreoni (UMD), Akash Anumarlapudi (UWM), Varun Bhalero (IITB), Eric Bellm (UW), Brad Cenko (NASA GSFC), Dave Cook (Caltech/IPAC), Michael Coughlin (UMN), Matthew Graham (Caltech), Mansi Kasliwal (Caltech), Ravi Kumar (IITB), Antonella Palmese (CMU), Robert Stein (Caltech), Anirudh Salgundi (IITB), Aswin Suresh (IITB), Andrew Toivonen (UMN) Yogesh Wagh (IITB), and Gaurav Waratkar (IITB) report on behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations:\n\nWe observed the localization region of IGWN trigger S240413p (GCN #36075) 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 2024-04-13 03:14 UTC, approximately 0.9 hours after event time. We covered 77.9% (40.9 sq deg) of the reported localization region. This estimate accounts for chip gaps and IPAC pipeline processing completeness. Each exposure was 300s with a typical depth of ~22 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). We queried the ZTF alert stream using Kowalski (Duev et al. 2019) through Fritz (Coughlin et al. 2023) and emgwcave (Karambelkar et al. in prep), AMPEL (Nordin et al. 2019) through nuztf (Stein et al. 2021), and ZTFReST (Andreoni & Coughlin et al., 2021). \n\nSince this GW event is classified as a binary black hole merger (GCN #36075), we checked for known AGN that were flaring and in the relevant GW volume. WISEA J105644.96+105455.6 (ZTF18acvgziq) has a spectroscopic redshift of 0.067, which falls within the lower end of the 2 sigma distance distribution of S240413p. We find ZTF18acvgziq is possibly showing some flaring activity and needs further investigation.\n\nSeparately, we searched for new sources in the GW error circle and examined their photometric and host properties. We required at least 2 detections separated by at least 15 minutes to select against moving objects. Furthermore, we cross-match our candidates with the Minor Planet Center to flag known asteroids, reject stellar sources (Tachibana and Miller 2018), and apply machine learning algorithms (Mahabal et al. 2019). We require that no spatially coincident ZTF alerts were issued before the detection time of the IGWN trigger. We also run forced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry et al. 2018, Smith et al. 2020) and require no detections before the IGWN trigger. \n\nWe are left with the following high-significance transient candidates by our pipeline, all lying within the 95.0% localization of the skymap. We report the following eight sources to TNS. We note that the host galaxy of ZTF24aajmkte (AT2024gnd) has a spectroscopic redshift of 0.084 that is consistent within one-sigma of the GW distance, but the absolute magnitude of the detection is consistent with a supernova. We note that ZTF24aajmirr (AT2024gnb), ZTF24aajnbrw (AT2024gnh), ZTF24aajohse (AT2024gni), ZTF24aajmpex (At2024gne), ZTF24aajmjmz (AT2024gnc) have a median photometric redshift that is inconsistent with the GW skymap but the error bar on the redshift is large and they cannot be firmly rejected as too far. The sources ZTF24aajmzjy (AT2024gmz), ZTF24aajmrjl (AT2024gng) don't have a host photo-z but show no evidence of intra-night photometric evolution within the error bars (the baseline between the first and last observation was about four hours).\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019), Kowalski (Duev et al. 2019), and SkyPortal (van der Walt et al. 2019; Coughlin et al. 2023). The GROWTH India Telescope (GIT, Kumar et al., 2022) is set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. Its operations are partially supported by funding from the IIT Bombay alumni batch of 1994. The Fritz and SkyPortal projects acknowledge the generous support of The Gordon and Betty Moore Foundation.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36080.",
"published": "2024-04-13T19:08:12.050069Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T19:08:12.050084Z",
"modified": "2024-04-13T19:08:12.059863Z",
"nonlocalizedevents": [
{
"event_id": "S240413p"
}
],
"targets": []
},
{
"id": 5656,
"topic": "gcn.circular",
"uuid": "5a5df48b-ca3b-4d1a-836a-ecf32b47f04f",
"title": "GRB 240101C: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>",
"data": {
"date": "24/01/02 03:31:02 GMT",
"from": "Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35451"
},
"title": "GCN CIRCULAR",
"number": "35451",
"subject": "GRB 240101C: Fermi GBM Final Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\n\"At 12:57:23.76 UT on 01 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240101C (trigger 725806648/240101540).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 4.73, Dec = 30.46 (J2000 degrees, equivalent to J2000 0h 18m, +30d 27'),\nwith a statistical uncertainty of 3.33 degrees.\n\nThe angle from the Fermi LAT boresight is 69 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240101540/quicklook/glg_skymap_all_bn240101540.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/bn240101540/quicklook/glg_healpix_all_bn240101540.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240101540/quicklook/glg_lc_medres34_bn240101540.gif\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35451.",
"published": "2024-01-02T03:31:13.529252Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T03:31:13.529270Z",
"modified": "2024-01-02T03:31:13.536409Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5657,
"topic": "gcn.circular",
"uuid": "e777b490-0d9a-4d70-8fbd-a9b69ce03ed9",
"title": "GRB 240101A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/02 04:21:50 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35452"
},
"title": "GCN CIRCULAR",
"number": "35452",
"subject": "GRB 240101A: Enhanced Swift-XRT position"
},
"message_text": "A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 885 s of XRT Photon Counting mode data and 2 UVOT\nimages for GRB 240101A, 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 = 10.34841, +8.51582 which is equivalent\nto:\n\nRA (J2000): 00h 41m 23.62s\nDec (J2000): +08d 30' 57.0\"\n\nwith an uncertainty of 2.2 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35452.",
"published": "2024-01-02T04:22:06.500445Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T04:22:06.500460Z",
"modified": "2024-01-02T04:22:06.506108Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5658,
"topic": "gcn.circular",
"uuid": "09d9edd1-459a-4b62-af76-369d45917aa9",
"title": "GRB 240101A: KAIT Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"data": {
"date": "24/01/02 07:21:22 GMT",
"from": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35453"
},
"title": "GCN CIRCULAR",
"number": "35453",
"subject": "GRB 240101A: KAIT Optical Upper Limit"
},
"message_text": "WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on\n\nbehalf of the KAIT GRB team:\n\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, responded to Swift GRB 240101A (Cenko et al.,\n\nGCN 35448) starting at 15.57 hours after the burst. A total of\n\n31x60s images were obtained in the clear (roughly R) filters.\n\nWe do not detect any optical afterglow candidate within the Enhanced\n\nXRT position error circle (Beardmore et al., GCN 35452), neither in\n\nsingle image, nor in the co-add images. The typical limiting magnitude\n\nof our single clear image is about 18.5 mag calibrated to the PS1 catalog.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35453.",
"published": "2024-01-02T07:21:37.165797Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T07:21:37.165813Z",
"modified": "2024-01-02T07:21:37.173228Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5659,
"topic": "gcn.circular",
"uuid": "9e6cface-ceb9-4af8-b061-0368f4966ff2",
"title": "GRB 240101B: KAIT Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"data": {
"date": "24/01/02 07:23:47 GMT",
"from": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35454"
},
"title": "GCN CIRCULAR",
"number": "35454",
"subject": "GRB 240101B: KAIT Optical Upper Limit"
},
"message_text": "WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on\n\nbehalf of the KAIT GRB team:\n\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, responded to Swift GRB 240101B (Cenko et al.,\n\nGCN 35449) starting at 7.38 hours after the burst. A total of\n\n31x60s images were obtained in the clear (roughly R) filters.\n\nWe do not detect any optical afterglow candidate within the XRT\n\nposition error circle (Cenko et al., GCN 35449), neither in single\n\nimage, nor in the co-add images. The typical limiting magnitude of\n\nour single clear image is about 18.5 mag calibrated to the PS1 catalog.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35454.",
"published": "2024-01-02T07:23:55.340214Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T07:23:55.340230Z",
"modified": "2024-01-02T07:23:55.345308Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5660,
"topic": "gcn.circular",
"uuid": "be505674-12df-469c-9e7c-4db5750bab1e",
"title": "GRB 240101B: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/02 10:15:22 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35455"
},
"title": "GCN CIRCULAR",
"number": "35455",
"subject": "GRB 240101B: 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 1510 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 240101B, 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 = 352.09572, +51.63617 which is equivalent\nto:\n\nRA (J2000): 23h 28m 22.97s\nDec (J2000): +51d 38' 10.2\"\n\nwith an uncertainty of 2.2 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35455.",
"published": "2024-01-02T10:15:32.187871Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T10:15:32.187886Z",
"modified": "2024-01-02T10:15:32.195874Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5661,
"topic": "gcn.circular",
"uuid": "a735f836-6ef0-41ab-bc70-bed7a40c070c",
"title": "GRB 240101A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/02 11:11:51 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35456"
},
"title": "GCN CIRCULAR",
"number": "35456",
"subject": "GRB 240101A: Swift-XRT refined Analysis"
},
"message_text": "D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester),\nJ.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri\n(INAF-OAR), T. Sbarrato (INAF-OAB), S. Dichiara (PSU) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 6.8 ks of XRT data for GRB 240101A, from 142 s to 57.6\nks after the BAT trigger. The data are entirely in Photon Counting\n(PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.06 (+0.08, -0.07).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.1 (+/-0.3). The\nbest-fitting absorption column is 4.3 (+1.8, -1.5) x 10^21 cm^-2, in\nexcess of the Galactic value of 5.8 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 3.9 x 10^-11 (6.5 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 4.3 (+1.8, -1.5) x 10^21 cm^-2\nGalactic foreground: 5.8 x 10^20 cm^-2\nExcess significance: 4.1 sigma\nPhoton index:\t 2.1 (+/-0.3)\n\nIf the light curve continues to decay with a power-law decay index of\n1.06, the count rate at T+24 hours will be 1.4 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.6 x\n10^-14 (9.3 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/01205708.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35456.",
"published": "2024-01-02T11:12:01.113680Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T11:12:01.113696Z",
"modified": "2024-01-02T11:12:01.120831Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5662,
"topic": "gcn.circular",
"uuid": "df3d747b-355c-45ed-96a1-feae323787f1",
"title": "GRB 240101A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "24/01/02 12:10:21 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35457"
},
"title": "GCN CIRCULAR",
"number": "35457",
"subject": "GRB 240101A: Swift/UVOT Upper Limits"
},
"message_text": "N. P. M. Kuin (UCL-MSSL) 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 240101A\n168 s after the BAT trigger (Cenko et al., GCN Circ. 35448).\nNo optical afterglow consistent with the BAT position\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 168 318 147 >20.4\nwhite 168 1053 334 >20.8\nv 656 4661 236 >18.7\nb 582 773 39 >18.9\nu 729 749 19 >18.3\nw1 705 5071 236 >19.5\nw2 804 824 19 >18.7\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.059 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35457.",
"published": "2024-01-02T12:10:32.197502Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T12:10:32.197517Z",
"modified": "2024-01-02T12:10:32.205202Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5663,
"topic": "gcn.circular",
"uuid": "f600fa9a-b3d0-468d-b191-ac50f85979a2",
"title": "GRB 240101B: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "24/01/02 12:11:38 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35458"
},
"title": "GCN CIRCULAR",
"number": "35458",
"subject": "GRB 240101B: Swift/UVOT Upper Limits"
},
"message_text": "N. P. M. Kuin (UCL-MSSL) 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 240101B\n110 s after the BAT trigger (Cenko et al., GCN Circ. 35449).\nNo optical afterglow consistent with the XRT position\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 134 284 147 >21.1\nu_FC 294 543 246 >20.1\nwhite 134 1718 411 >21.8\nv 110 1595 130 >19.2\nb 549 1693 117 >20.5\nu 294 1669 343 >20.2\nw1 675 1644 117 >19.3\nm2 648 1619 97 >21.0\nw2 599 1741 134 >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.287 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35458.",
"published": "2024-01-02T12:11:48.457398Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T12:11:48.457412Z",
"modified": "2024-01-02T12:11:48.462308Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5664,
"topic": "gcn.circular",
"uuid": "b069fa76-16c6-4c23-bb5d-b9686016c72d",
"title": "GRB 240101C: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/02 15:28:27 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35459"
},
"title": "GCN CIRCULAR",
"number": "35459",
"subject": "GRB 240101C: 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, L. Szakszonova, 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.), T. 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 short-duration GRB 240101C (Fermi/GBM detection: GCN 35451; INTEGRAL/SPI-ACS peak detection at 2024-01-01 ~12:57:24 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2024-01-01 12:57:24 UTC. The T90 duration measured by GRBAlpha is 1 s and the overall significance during T90 reaches 4.9 sigma in the 120-400 keV band.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240101C_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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35459.",
"published": "2024-01-02T15:28:42.824978Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T15:28:42.824994Z",
"modified": "2024-01-02T15:28:42.831350Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5665,
"topic": "gcn.circular",
"uuid": "8a1c22b2-0dff-4d94-a963-2c1a6256cc21",
"title": "GRB 240101A: Terskol Zeiss-2000 optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/01/02 16:26:17 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35460"
},
"title": "GCN CIRCULAR",
"number": "35460",
"subject": "GRB 240101A: Terskol Zeiss-2000 optical observations"
},
"message_text": "A. Volnova (IKI), P. Phorunzij (INASAN), A. Pozanenko (IKI), N. Pankov (IKI, HSE), S. Belkin (IKI, HSE) report on behalf of GRB IKI FuN:\n\nWe observed the GRB 240101A (Cenko et al., GCN 35448) with Zeiss-2000 telescope of Terskol observatory starting on 2024-01-01 (UT) 16:10:24. Within enhanced Enhanced Swift-XRT position (Beardmore et al., GCN 35452) we do not detect any optical objects. However we marginally detected the object at coordinates (J2000) 00:41:23.50 +8:30:58.48, which is 3.4 arcsec from XRT position (Beardmore et al., GCN 35452). Preliminary photometry of the marginally detected object is following.\n\nDate UT start t-T0 Filter Exp. OT Err. UL.\n (mid, days) (s) S/N\n\n\n2024-01-01 16:10:24 0.1823 R 19*60 23.7 2.0 23.0\n\n\nThe photometry is based on the nearby PS1 stars photometry (Lupton transformations)\nRA Dec c R(Lupton)\n00:41:22.24 +08:31:56.6 16.277 +/- 0.012\n00:41:17.90 +08:31:41.5 18.013 +/- 0.014\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35460.",
"published": "2024-01-02T16:26:29.188282Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T16:26:29.188296Z",
"modified": "2024-01-02T16:26:29.196930Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6538,
"topic": "gcn.circular",
"uuid": "87fccc46-94d6-4f82-b0c5-b9c6b26211f7",
"title": "LIGO/Virgo/KAGRA S240413p: 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": "24/04/13 20:15:39 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36081"
},
"title": "GCN CIRCULAR",
"number": "36081",
"subject": "LIGO/Virgo/KAGRA S240413p: 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo/KAGRA S240413p errorbox 47897 sec after notice time and 47961 sec after trigger time at 2024-04-13 15:39:40 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 49 deg. The sun altitude is -30.7 deg.\n\nMASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the LIGO/Virgo/KAGRA S240413p errorbox 54233 sec after notice time and 54296 sec after trigger time at 2024-04-13 17:25:15 UT, with upper limit up to 19.5 mag. Observations started at twilight. The observations began at zenith distance = 40 deg. The sun altitude is -11.2 deg.\n\nThe galactic latitude b = 61 deg., longitude l = 240 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0019292\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 47966 | 2024-04-13 15:39:40 | MASTER-Amur | (11h 05m 07.70s , +11d 56m 23.3s) | C | 10 | 13.3 |\n 47966 | 2024-04-13 15:39:40 | MASTER-Amur | (11h 05m 15.68s , +11d 31m 55.7s) | C | 10 | 15.0 |\n 48338 | 2024-04-13 15:45:52 | MASTER-Amur | (11h 05m 07.59s , +11d 56m 16.1s) | C | 10 | 12.8 |\n 48338 | 2024-04-13 15:45:52 | MASTER-Amur | (11h 05m 15.80s , +11d 31m 45.0s) | C | 10 | 15.0 |\n 49375 | 2024-04-13 16:03:08 | MASTER-Amur | (11h 05m 09.17s , +11d 56m 32.6s) | C | 10 | 13.8 |\n 49375 | 2024-04-13 16:03:08 | MASTER-Amur | (11h 05m 18.70s , +11d 31m 24.0s) | C | 10 | 15.1 |\n 49422 | 2024-04-13 16:03:55 | MASTER-Amur | (11h 05m 15.08s , +11d 55m 16.3s) | C | 10 | 14.1 |\n 49422 | 2024-04-13 16:03:55 | MASTER-Amur | (11h 05m 23.79s , +11d 30m 22.1s) | C | 10 | 15.3 |\n 49465 | 2024-04-13 16:04:38 | MASTER-Amur | (11h 05m 09.16s , +11d 54m 30.9s) | C | 10 | 14.5 |\n 49465 | 2024-04-13 16:04:38 | MASTER-Amur | (11h 05m 18.83s , +11d 29m 22.4s) | C | 10 | 15.1 |\n 49508 | 2024-04-13 16:05:21 | MASTER-Amur | (11h 05m 16.23s , +11d 54m 23.8s) | C | 10 | 14.0 |\n 49508 | 2024-04-13 16:05:21 | MASTER-Amur | (11h 05m 25.01s , +11d 29m 27.9s) | C | 10 | 15.1 |\n 49550 | 2024-04-13 16:06:04 | MASTER-Amur | (11h 05m 13.72s , +11d 56m 06.3s) | C | 10 | 13.4 |\n 49550 | 2024-04-13 16:06:04 | MASTER-Amur | (11h 05m 22.30s , +11d 31m 10.3s) | C | 10 | 15.1 |\n 49594 | 2024-04-13 16:06:47 | MASTER-Amur | (11h 05m 13.72s , +11d 54m 41.9s) | C | 10 | 13.6 |\n 49594 | 2024-04-13 16:06:47 | MASTER-Amur | (11h 05m 22.31s , +11d 29m 46.4s) | C | 10 | 15.0 |\n 49637 | 2024-04-13 16:07:30 | MASTER-Amur | (11h 05m 15.65s , +11d 55m 47.3s) | C | 10 | 16.3 |\n 49697 | 2024-04-13 16:07:30 | MASTER-Amur | (11h 05m 15.65s , +11d 55m 47.3s) | C | 130 | 17.7 | Coadd\n 49637 | 2024-04-13 16:07:30 | MASTER-Amur | (11h 05m 25.34s , +11d 30m 49.1s) | C | 10 | 15.0 |\n 49680 | 2024-04-13 16:08:14 | MASTER-Amur | (11h 05m 08.84s , +11d 55m 16.6s) | C | 10 | 16.4 |\n 49680 | 2024-04-13 16:08:14 | MASTER-Amur | (11h 05m 18.58s , +11d 30m 18.1s) | C | 10 | 14.9 |\n 49723 | 2024-04-13 16:08:56 | MASTER-Amur | (11h 05m 09.72s , +11d 56m 17.1s) | C | 10 | 16.4 |\n 49723 | 2024-04-13 16:08:56 | MASTER-Amur | (11h 05m 19.48s , +11d 31m 18.6s) | C | 10 | 14.9 |\n 49766 | 2024-04-13 16:09:40 | MASTER-Amur | (11h 05m 15.78s , +11d 55m 15.2s) | C | 10 | 16.2 |\n 49766 | 2024-04-13 16:09:40 | MASTER-Amur | (11h 05m 25.59s , +11d 30m 16.8s) | C | 10 | 15.1 |\n 49809 | 2024-04-13 16:10:23 | MASTER-Amur | (11h 05m 09.65s , +11d 54m 16.4s) | C | 10 | 16.2 |\n 49809 | 2024-04-13 16:10:23 | MASTER-Amur | (11h 05m 19.51s , +11d 29m 17.9s) | C | 10 | 15.1 |\n 49852 | 2024-04-13 16:11:06 | MASTER-Amur | (11h 05m 14.76s , +11d 54m 17.4s) | C | 10 | 16.5 |\n 49852 | 2024-04-13 16:11:06 | MASTER-Amur | (11h 05m 24.64s , +11d 29m 18.3s) | C | 10 | 15.2 |\n 49895 | 2024-04-13 16:11:49 | MASTER-Amur | (11h 05m 13.15s , +11d 55m 48.8s) | C | 10 | 16.4 |\n 49895 | 2024-04-13 16:11:49 | MASTER-Amur | (11h 05m 22.95s , +11d 30m 52.3s) | C | 10 | 15.3 |\n 49938 | 2024-04-13 16:12:32 | MASTER-Amur | (11h 05m 13.09s , +11d 54m 42.2s) | C | 10 | 16.4 |\n 49938 | 2024-04-13 16:12:32 | MASTER-Amur | (11h 05m 22.92s , +11d 29m 45.9s) | C | 10 | 15.3 |\n 50057 | 2024-04-13 16:14:30 | MASTER-Amur | (11h 05m 15.47s , +11d 56m 06.4s) | C | 10 | 16.3 |\n 50057 | 2024-04-13 16:14:30 | MASTER-Amur | (11h 05m 25.53s , +11d 31m 11.6s) | C | 10 | 13.7 |\n 50100 | 2024-04-13 16:15:13 | MASTER-Amur | (11h 05m 10.40s , +11d 55m 23.0s) | C | 10 | 16.3 |\n 50100 | 2024-04-13 16:15:13 | MASTER-Amur | (11h 05m 20.59s , +11d 30m 28.0s) | C | 10 | 14.0 |\n 50336 | 2024-04-13 16:19:09 | MASTER-Amur | (11h 05m 09.90s , +11d 56m 15.9s) | C | 10 | 16.1 |\n 50336 | 2024-04-13 16:19:09 | MASTER-Amur | (11h 05m 20.17s , +11d 31m 20.7s) | C | 10 | 15.3 |\n 50379 | 2024-04-13 16:19:52 | MASTER-Amur | (11h 05m 15.67s , +11d 55m 13.9s) | C | 10 | 16.1 |\n 50379 | 2024-04-13 16:19:52 | MASTER-Amur | (11h 05m 25.97s , +11d 30m 17.9s) | C | 10 | 15.1 |\n 50421 | 2024-04-13 16:20:35 | MASTER-Amur | (11h 05m 09.91s , +11d 54m 14.2s) | C | 10 | 16.0 |\n 50421 | 2024-04-13 16:20:35 | MASTER-Amur | (11h 05m 20.26s , +11d 29m 17.8s) | C | 10 | 15.3 |\n 50489 | 2024-04-13 16:21:18 | MASTER-Amur | (10h 58m 53.34s , +11d 54m 23.0s) | C | 60 | 17.2 |\n 50489 | 2024-04-13 16:21:18 | MASTER-Amur | (10h 59m 04.19s , +11d 29m 24.2s) | C | 60 | 16.4 |\n 50582 | 2024-04-13 16:22:51 | MASTER-Amur | (10h 58m 50.64s , +11d 55m 51.6s) | C | 60 | 17.1 |\n 50582 | 2024-04-13 16:22:51 | MASTER-Amur | (10h 59m 01.54s , +11d 30m 52.4s) | C | 60 | 16.2 |\n 50705 | 2024-04-13 16:24:24 | MASTER-Amur | (10h 58m 50.73s , +11d 54m 39.1s) | C | 120 | 17.2 |\n 50705 | 2024-04-13 16:24:24 | MASTER-Amur | (10h 59m 01.71s , +11d 29m 39.0s) | C | 120 | 16.4 |\n 50859 | 2024-04-13 16:26:57 | MASTER-Amur | (10h 58m 53.81s , +11d 55m 49.3s) | C | 120 | 17.3 |\n 50859 | 2024-04-13 16:26:58 | MASTER-Amur | (10h 59m 04.93s , +11d 30m 48.5s) | C | 120 | 16.6 |\n 51043 | 2024-04-13 16:29:31 | MASTER-Amur | (10h 57m 04.58s , +09d 55m 14.8s) | C | 180 | 16.8 |\n 51043 | 2024-04-13 16:29:31 | MASTER-Amur | (10h 57m 16.57s , +09d 30m 06.8s) | C | 180 | 16.3 |\n 51256 | 2024-04-13 16:33:04 | MASTER-Amur | (10h 57m 04.84s , +09d 56m 14.4s) | C | 180 | 16.8 |\n 51256 | 2024-04-13 16:33:04 | MASTER-Amur | (10h 57m 17.01s , +09d 31m 04.9s) | C | 180 | 16.3 |\n 51469 | 2024-04-13 16:36:38 | MASTER-Amur | (10h 53m 02.44s , +07d 55m 21.1s) | C | 180 | 16.6 |\n 51469 | 2024-04-13 16:36:38 | MASTER-Amur | (10h 53m 15.55s , +07d 30m 03.0s) | C | 180 | 16.1 |\n 51683 | 2024-04-13 16:40:11 | MASTER-Amur | (10h 52m 57.49s , +07d 54m 22.4s) | C | 180 | 16.8 |\n 51683 | 2024-04-13 16:40:11 | MASTER-Amur | (10h 53m 10.79s , +07d 29m 02.2s) | C | 180 | 16.1 |\n 51896 | 2024-04-13 16:43:45 | MASTER-Amur | (11h 01m 18.60s , +11d 54m 28.3s) | C | 180 | 17.3 |\n 51896 | 2024-04-13 16:43:45 | MASTER-Amur | (11h 01m 30.80s , +11d 29m 18.9s) | C | 180 | 16.5 |\n 52109 | 2024-04-13 16:47:18 | MASTER-Amur | (11h 01m 16.02s , +11d 55m 49.5s) | C | 180 | 17.5 |\n 52109 | 2024-04-13 16:47:18 | MASTER-Amur | (11h 01m 28.37s , +11d 30m 39.5s) | C | 180 | 16.8 |\n 52969 | 2024-04-13 17:02:08 | MASTER-Amur | (10h 58m 53.21s , +11d 55m 53.2s) | C | 120 | 16.8 |\n 52969 | 2024-04-13 17:02:08 | MASTER-Amur | (10h 59m 07.44s , +11d 31m 09.0s) | C | 120 | 16.1 |\n 53122 | 2024-04-13 17:04:41 | MASTER-Amur | (10h 58m 53.17s , +11d 54m 37.4s) | C | 120 | 16.6 |\n 53123 | 2024-04-13 17:04:41 | MASTER-Amur | (10h 59m 07.65s , +11d 29m 50.9s) | C | 120 | 15.9 |\n 53276 | 2024-04-13 17:07:15 | MASTER-Amur | (10h 40m 57.31s , +05d 56m 28.3s) | C | 120 | 15.2 |\n 53276 | 2024-04-13 17:07:15 | MASTER-Amur | (10h 41m 14.79s , +05d 31m 14.3s) | C | 120 | 14.8 |\n 53430 | 2024-04-13 17:09:48 | MASTER-Amur | (10h 40m 51.36s , +05d 55m 48.0s) | C | 120 | 15.2 |\n 53430 | 2024-04-13 17:09:48 | MASTER-Amur | (10h 41m 08.91s , +05d 30m 32.0s) | C | 120 | 14.5 |\n 53583 | 2024-04-13 17:12:21 | MASTER-Amur | (10h 44m 54.41s , +06d 56m 45.0s) | C | 120 | 15.4 |\n 53583 | 2024-04-13 17:12:21 | MASTER-Amur | (10h 45m 11.68s , +06d 31m 31.8s) | C | 120 | 14.7 |\n 53737 | 2024-04-13 17:14:55 | MASTER-Amur | (10h 45m 01.62s , +06d 55m 46.8s) | C | 120 | 15.2 |\n 53737 | 2024-04-13 17:14:55 | MASTER-Amur | (10h 45m 19.10s , +06d 30m 32.2s) | C | 120 | 14.5 |\n 53860 | 2024-04-13 17:17:28 | MASTER-Amur | (10h 44m 55.49s , +06d 54m 47.4s) | C | 60 | 14.6 |\n 53860 | 2024-04-13 17:17:28 | MASTER-Amur | (10h 45m 13.14s , +06d 29m 31.6s) | C | 60 | 14.0 |\n 53953 | 2024-04-13 17:19:01 | MASTER-Amur | (10h 45m 01.68s , +06d 54m 50.7s) | C | 60 | 14.6 |\n 53953 | 2024-04-13 17:19:01 | MASTER-Amur | (10h 45m 19.47s , +06d 29m 34.4s) | C | 60 | 13.7 |\n 54046 | 2024-04-13 17:20:34 | MASTER-Amur | (10h 44m 58.69s , +06d 56m 28.1s) | C | 60 | 14.5 |\n 54046 | 2024-04-13 17:20:34 | MASTER-Amur | (10h 45m 16.68s , +06d 31m 11.2s) | C | 60 | 13.7 |\n 54139 | 2024-04-13 17:22:08 | MASTER-Amur | (10h 38m 50.67s , +04d 55m 23.2s) | C | 60 | 14.1 |\n 54139 | 2024-04-13 17:22:08 | MASTER-Amur | (10h 39m 09.80s , +04d 29m 56.3s) | C | 60 | 12.9 |\n 54233 | 2024-04-13 17:23:41 | MASTER-Amur | (10h 38m 53.02s , +04d 56m 40.7s) | C | 60 | 13.9 |\n 54233 | 2024-04-13 17:23:41 | MASTER-Amur | (10h 39m 12.29s , +04d 31m 13.2s) | C | 60 | 12.7 |\n 54326 | 2024-04-13 17:25:14 | MASTER-Amur | (10h 38m 48.03s , +04d 56m 07.5s) | C | 60 | 13.5 |\n 54326 | 2024-04-13 17:25:14 | MASTER-Amur | (10h 39m 07.46s , +04d 30m 39.1s) | C | 60 | 12.1 |\n 54357 | 2024-04-13 17:25:15 | MASTER-Tavrida | (10h 59m 51.61s , +11d 24m 17.1s) | C | 120 | 17.7 |\n 54419 | 2024-04-13 17:26:47 | MASTER-Amur | (11h 03m 15.22s , +11d 56m 33.3s) | C | 60 | 15.4 |\n 54419 | 2024-04-13 17:26:47 | MASTER-Amur | (11h 03m 31.72s , +11d 31m 32.5s) | C | 60 | 14.6 |\n 54486 | 2024-04-13 17:27:25 | MASTER-Tavrida | (10h 59m 57.80s , +11d 24m 10.3s) | C | 120 | 17.8 |\n 54512 | 2024-04-13 17:28:21 | MASTER-Amur | (11h 03m 21.40s , +11d 55m 33.3s) | C | 60 | 15.3 |\n 54512 | 2024-04-13 17:28:21 | MASTER-Amur | (11h 03m 37.95s , +11d 30m 32.2s) | C | 60 | 14.4 |\n 54617 | 2024-04-13 17:29:35 | MASTER-Tavrida | (10h 59m 54.94s , +11d 25m 54.1s) | C | 120 | 17.9 |\n 54605 | 2024-04-13 17:29:53 | MASTER-Amur | (11h 03m 14.27s , +11d 54m 36.0s) | C | 60 | 15.2 |\n 54605 | 2024-04-13 17:29:53 | MASTER-Amur | (11h 03m 30.89s , +11d 29m 34.3s) | C | 60 | 14.5 |\n 54698 | 2024-04-13 17:31:26 | MASTER-Amur | (10h 53m 13.14s , +09d 55m 07.8s) | C | 60 | 14.2 |\n 54698 | 2024-04-13 17:31:26 | MASTER-Amur | (10h 53m 30.80s , +09d 29m 56.3s) | C | 60 | 13.6 |\n 54745 | 2024-04-13 17:31:44 | MASTER-Tavrida | (10h 59m 55.01s , +11d 24m 04.4s) | C | 120 | 18.2 |\n 54791 | 2024-04-13 17:32:59 | MASTER-Amur | (10h 53m 10.49s , +09d 56m 36.5s) | C | 60 | 14.3 |\n 54791 | 2024-04-13 17:32:59 | MASTER-Amur | (10h 53m 28.24s , +09d 31m 25.1s) | C | 60 | 13.5 |\n 54877 | 2024-04-13 17:33:56 | MASTER-Tavrida | (10h 55m 57.72s , +10d 25m 23.5s) | C | 120 | 18.2 |\n 54884 | 2024-04-13 17:34:32 | MASTER-Amur | (10h 53m 10.55s , +09d 55m 22.6s) | C | 60 | 14.3 |\n 54884 | 2024-04-13 17:34:33 | MASTER-Amur | (10h 53m 28.39s , +09d 30m 10.5s) | C | 60 | 13.6 |\n 54977 | 2024-04-13 17:36:05 | MASTER-Amur | (10h 52m 06.76s , +08d 56m 03.4s) | C | 60 | 13.9 |\n 54977 | 2024-04-13 17:36:05 | MASTER-Amur | (10h 44m 51.16s , +08d 27m 16.8s) | C | 60 | 13.1 |\n 55007 | 2024-04-13 17:36:06 | MASTER-Tavrida | (10h 55m 52.01s , +10d 24m 41.9s) | C | 120 | 18.3 |\n 55070 | 2024-04-13 17:37:38 | MASTER-Amur | (10h 51m 60.00s , +08d 55m 31.6s) | C | 60 | 14.1 |\n 55070 | 2024-04-13 17:37:39 | MASTER-Amur | (10h 44m 44.50s , +08d 26m 43.7s) | C | 60 | 13.0 |\n 55135 | 2024-04-13 17:38:13 | MASTER-Tavrida | (10h 55m 52.04s , +10d 25m 38.6s) | C | 120 | 18.3 |\n 55163 | 2024-04-13 17:39:12 | MASTER-Amur | (10h 52m 00.12s , +08d 56m 33.8s) | C | 60 | 14.0 |\n 55163 | 2024-04-13 17:39:12 | MASTER-Amur | (10h 44m 44.72s , +08d 27m 45.1s) | C | 60 | 13.0 |\n 55265 | 2024-04-13 17:40:23 | MASTER-Tavrida | (10h 55m 58.93s , +10d 24m 35.3s) | C | 120 | 18.6 |\n 55256 | 2024-04-13 17:40:45 | MASTER-Amur | (10h 39m 38.90s , +02d 56m 05.8s) | C | 60 | 13.8 |\n 55349 | 2024-04-13 17:42:18 | MASTER-Amur | (10h 39m 33.90s , +02d 55m 10.5s) | C | 60 | 13.5 |\n 55398 | 2024-04-13 17:42:36 | MASTER-Tavrida | (10h 55m 53.77s , +08d 23m 31.7s) | C | 120 | 18.6 |\n 55442 | 2024-04-13 17:43:51 | MASTER-Amur | (10h 39m 39.69s , +02d 55m 24.2s) | C | 60 | 13.6 |\n 55529 | 2024-04-13 17:44:48 | MASTER-Tavrida | (10h 55m 59.57s , +08d 23m 32.3s) | C | 120 | 18.7 |\n 55660 | 2024-04-13 17:46:58 | MASTER-Tavrida | (10h 55m 57.09s , +08d 25m 00.3s) | C | 120 | 18.7 |\n 55788 | 2024-04-13 17:49:07 | MASTER-Tavrida | (10h 55m 57.14s , +08d 23m 46.9s) | C | 120 | 18.8 |\n 56843 | 2024-04-13 18:06:42 | MASTER-Tavrida | (10h 52m 02.35s , +05d 23m 08.7s) | C | 120 | 18.9 |\n 56977 | 2024-04-13 18:08:55 | MASTER-Tavrida | (10h 47m 57.14s , +09d 24m 44.5s) | C | 120 | 18.9 |\n 57105 | 2024-04-13 18:11:04 | MASTER-Tavrida | (10h 47m 57.20s , +09d 22m 48.3s) | C | 120 | 18.9 |\n 57239 | 2024-04-13 18:13:17 | MASTER-Tavrida | (11h 04m 01.49s , +08d 24m 53.3s) | C | 120 | 18.9 |\n 57510 | 2024-04-13 18:17:48 | MASTER-Tavrida | (11h 03m 55.02s , +08d 24m 10.0s) | C | 120 | 18.9 |\n 57643 | 2024-04-13 18:20:02 | MASTER-Tavrida | (11h 10m 17.23s , +12d 25m 16.6s) | C | 120 | 19.0 |\n 57772 | 2024-04-13 18:22:10 | MASTER-Tavrida | (11h 10m 22.33s , +12d 24m 13.0s) | C | 120 | 19.2 |\n 57904 | 2024-04-13 18:24:23 | MASTER-Tavrida | (10h 59m 53.46s , +12d 22m 51.1s) | C | 120 | 19.2 |\n 58032 | 2024-04-13 18:26:30 | MASTER-Tavrida | (10h 59m 58.57s , +12d 22m 53.4s) | C | 120 | 19.2 |\n 58165 | 2024-04-13 18:28:44 | MASTER-Tavrida | (11h 03m 56.46s , +11d 24m 24.8s) | C | 120 | 19.2 |\n 58293 | 2024-04-13 18:30:52 | MASTER-Tavrida | (11h 03m 56.55s , +11d 22m 54.8s) | C | 120 | 19.2 |\n 58422 | 2024-04-13 18:33:00 | MASTER-Tavrida | (11h 03m 59.84s , +11d 24m 20.9s) | C | 120 | 19.4 |\n 58553 | 2024-04-13 18:35:11 | MASTER-Tavrida | (11h 03m 52.69s , +11d 23m 44.0s) | C | 120 | 19.3 |\n 58682 | 2024-04-13 18:37:21 | MASTER-Tavrida | (11h 03m 54.19s , +11d 24m 41.7s) | C | 120 | 19.3 |\n 58811 | 2024-04-13 18:39:29 | MASTER-Tavrida | (11h 03m 58.95s , +11d 23m 39.1s) | C | 120 | 19.2 |\n 58940 | 2024-04-13 18:41:38 | MASTER-Tavrida | (11h 03m 53.62s , +11d 22m 36.2s) | C | 120 | 19.1 |\n 59069 | 2024-04-13 18:43:48 | MASTER-Tavrida | (11h 03m 59.78s , +11d 22m 46.5s) | C | 120 | 19.3 |\n 59201 | 2024-04-13 18:45:59 | MASTER-Tavrida | (11h 03m 56.95s , +11d 24m 16.1s) | C | 120 | 19.3 |\n 59329 | 2024-04-13 18:48:08 | MASTER-Tavrida | (11h 03m 57.06s , +11d 22m 48.6s) | C | 120 | 19.1 |\n 59460 | 2024-04-13 18:50:19 | MASTER-Tavrida | (11h 04m 01.11s , +11d 24m 22.9s) | C | 120 | 19.3 |\n 59592 | 2024-04-13 18:52:30 | MASTER-Tavrida | (11h 03m 54.71s , +11d 23m 25.1s) | C | 120 | 19.2 |\n 59726 | 2024-04-13 18:54:45 | MASTER-Tavrida | (10h 51m 56.68s , +05d 24m 05.0s) | C | 120 | 19.3 |\n 59858 | 2024-04-13 18:56:57 | MASTER-Tavrida | (10h 48m 03.92s , +04d 22m 56.4s) | C | 120 | 19.5 |\n 59988 | 2024-04-13 18:59:07 | MASTER-Tavrida | (10h 47m 57.82s , +04d 21m 53.8s) | C | 120 | 19.1 |\n 60130 | 2024-04-13 19:01:29 | MASTER-Tavrida | (10h 32m 05.09s , +02d 21m 55.3s) | C | 120 | 19.1 |\n 60259 | 2024-04-13 19:03:37 | MASTER-Tavrida | (10h 32m 01.51s , +02d 23m 08.6s) | C | 120 | 19.1 |\n 60391 | 2024-04-13 19:05:49 | MASTER-Tavrida | (10h 31m 14.35s , +00d 21m 31.8s) | C | 120 | 19.2 |\n 60522 | 2024-04-13 19:08:00 | MASTER-Tavrida | (10h 31m 17.23s , +00d 23m 14.2s) | C | 120 | 19.0 |\n 60627 | 2024-04-13 19:10:16 | MASTER-Tavrida | (11h 11m 06.66s , +14d 13m 10.8s) | C | 60 | 19.0 |\n 60921 | 2024-04-13 19:15:09 | MASTER-Tavrida | (10h 37m 07.69s , +05d 17m 40.0s) | C | 60 | 18.6 |\n 60994 | 2024-04-13 19:16:22 | MASTER-Tavrida | (10h 52m 20.76s , +05d 18m 07.3s) | C | 60 | 18.9 |\n 62148 | 2024-04-13 19:35:37 | MASTER-Tavrida | (11h 11m 10.99s , +14d 12m 53.0s) | C | 60 | 19.1 |\n 62221 | 2024-04-13 19:36:50 | MASTER-Tavrida | (11h 19m 26.71s , +14d 11m 44.1s) | C | 60 | 19.2 |\n 62296 | 2024-04-13 19:38:04 | MASTER-Tavrida | (10h 37m 08.27s , +04d 42m 21.6s) | C | 60 | 18.8 |\n 62368 | 2024-04-13 19:39:16 | MASTER-Tavrida | (10h 45m 04.09s , +04d 41m 32.9s) | C | 60 | 18.9 |\n 62442 | 2024-04-13 19:40:30 | MASTER-Tavrida | (10h 52m 17.50s , +04d 42m 38.4s) | C | 60 | 19.0 |\n 63087 | 2024-04-13 19:51:26 | MASTER-Tavrida | (11h 04m 11.28s , +11d 42m 37.9s) | C | 40 | 19.0 |\n 63881 | 2024-04-13 20:04:29 | MASTER-Tavrida | (11h 11m 12.44s , +14d 12m 37.7s) | C | 60 | 19.1 |\n 64036 | 2024-04-13 20:07:05 | MASTER-Tavrida | (11h 19m 31.63s , +14d 12m 27.2s) | C | 60 | 19.2 |\n 64111 | 2024-04-13 20:08:20 | MASTER-Tavrida | (10h 37m 02.67s , +04d 41m 06.2s) | C | 60 | 18.7 |\n 64184 | 2024-04-13 20:09:32 | MASTER-Tavrida | (10h 45m 04.31s , +04d 42m 11.4s) | C | 60 | 18.9 |\nFilter C is a clear (unfiltred) band.\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/36081.",
"published": "2024-04-13T20:15:54.582303Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T20:15:54.582320Z",
"modified": "2024-04-13T20:15:54.590125Z",
"nonlocalizedevents": [
{
"event_id": "S240413p"
}
],
"targets": []
},
{
"id": 5666,
"topic": "gcn.circular",
"uuid": "40c47875-a3ce-413b-8bbd-d92da9278f85",
"title": "GRB 240102A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/01/02 18:19:27 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35461"
},
"title": "GCN CIRCULAR",
"number": "35461",
"subject": "GRB 240102A: Swift detection of a burst"
},
"message_text": "\nJ.D. Gropp (PSU), S. Dichiara (PSU), J. A. Kennea (PSU),\nK. L. Page (U Leicester) and M. A. Williams (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nAt 17:34:55 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240102A (trigger\u001205899). Swift slewed immediately to the\nburst. The BAT on-board calculated location is\nRA, Dec 96.846, -20.024 which is\n RA(J2000) = 06h 27m 23.0s\n Dec(J2000) = -20d 01' 26.4\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). We currently have no information regarding the\nBAT light-curve.\n\nThe XRT began observing the field at 17:37:00.6 UT, 125 seconds\nafter the BAT trigger. Using promptly downlinked data we find an\nuncatalogued X-ray source with an enhanced position: RA, Dec 96.83800,\n-20.04076 which is equivalent to:\n RA(J2000) = 06h 27m 21.12s\n Dec(J2000) = -20d 02' 26.7\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nposition is 66 arc-seconds from the BAT localization. This\nposition may be improved as more data are received; the latest position\nis 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 consistent with the Galactic value of 2.34\nx 10^21 cm^-2 (Willingale et al. 2013).\n\nNo afterglow is detected in the initial UVOT data products.\n\nBurst Advocate for this burst is J.D. Gropp (jdg44 AT psu.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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35461.",
"published": "2024-01-02T18:19:39.429254Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T18:19:39.429274Z",
"modified": "2024-01-02T18:19:39.436158Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5667,
"topic": "gcn.circular",
"uuid": "6290c086-d212-403f-98e5-0aba7c1185f6",
"title": "IceCube-Cascade 231230A: 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": "24/01/02 20:32:16 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35462"
},
"title": "GCN CIRCULAR",
"number": "35462",
"subject": "IceCube-Cascade 231230A: Upper limits from a search for additional neutrino events in IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-Cascade 231230A (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/138802_36470430.amon) in a time range of 1000 seconds centered on the alert event time (2023-12-30 09:33:26.570 UTC to 2023-12-30 09:50:06.570 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-Cascade 231230A. 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-Cascade 231230A ranges from 1.3e-01 to 3.3e-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 2e+02 GeV and 2e+05 GeV.\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2023-12-29 09:41:46.570 UTC to 2023-12-31 09:41:46.570 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-Cascade 231230A ranges from 1.5e-01 to 3.4e-01 GeV cm^-2 in a 2 day time window.\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.\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35462.",
"published": "2024-01-02T20:32:27.717164Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T20:32:27.717178Z",
"modified": "2024-01-02T20:32:27.724451Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5668,
"topic": "gcn.circular",
"uuid": "bd93eb06-8b0b-4722-bf9d-342fedae77c6",
"title": "GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT",
"submitter": "Hop gcn.circular",
"authors": "I. Peretto at MarSEC (Marana Space Explorer Center) <ricerca@marsec.org>",
"data": {
"date": "24/01/02 20:34:34 GMT",
"from": "I. Peretto at MarSEC (Marana Space Explorer Center) <ricerca@marsec.org>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35463"
},
"title": "GCN CIRCULAR",
"number": "35463",
"subject": "GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT"
},
"message_text": "Ivo Peretto (MarSEC, Marana Space Explorer Center, Marana Di Crespadoro, VI, Italy)\n\nMember of:\nUAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section.\nAAVSO (American Association Variable Stars Observers)\n\nIn collaboration with: Stefano Lora (MarSEC, Marana Space Explorer Center, Marana di Crespadoro, VI, Italy)\n\nreport:\nWe imaged the field of GRB 240101B detected by SWIFT(trigger=1205744)\nwith the telescope 14â RC Officine Stellari of MarSEC (Marana Space Explorer Center).\n\nThe observations with a series of 120 sec exposures started at 2024-01-01 21:42:43 UT, 77 min. after the GRB trigger, with a Ritchey-Chretien telescope D=360 mm f/ 8.\n\nat the following position:\n\nRA(J2000) = 23h 28m 12s\nDec(J2000) = +51d 38' 43\"\n\nWeather conditions were medium with Moon illuminated 70% at 2° from the horizon.\n\nWe co-added 30 exposures of 120 sec each.\n\nStart T0+ End T0+ V lim.\n 77 min 137 min 20.12\n\nWe did not found any optical counterpart in A.R. 23 28 12, DEC. +51 38 43 position and in the error box of the XRT candidate.\nref.: S. B. Cenko (GSFC) et al., GCN Circular 35449\n\nMagnitudes were estimated with the Gaia DR3 and\nare not corrected for galactic dust extinction.\n\nReference:\nhttps://www.marsec.org/\n\nThe message may be cited. \n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35463.",
"published": "2024-01-02T20:34:42.897886Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T20:34:42.897902Z",
"modified": "2024-01-02T20:34:42.904716Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5669,
"topic": "gcn.circular",
"uuid": "adabd299-02c2-4ef6-b63a-c0eaefa3c61b",
"title": "GRB 240102B: 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": "24/01/02 22:30:23 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35464"
},
"title": "GCN CIRCULAR",
"number": "35464",
"subject": "GRB 240102B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 22:12:10 UT on 2 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240102B (trigger 725926335.090798 / 240102925).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 338.1, Dec = 46.5 (J2000 degrees, equivalent to J2000 22h 32m, 46d 30'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 3.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240102925/quicklook/glg_skymap_all_bn240102925.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/bn240102925/quicklook/glg_healpix_all_bn240102925.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240102925/quicklook/glg_lc_medres34_bn240102925.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35464.",
"published": "2024-01-02T22:30:33.247849Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T22:30:33.247864Z",
"modified": "2024-01-02T22:30:33.253591Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5672,
"topic": "gcn.circular",
"uuid": "7e7ab9de-b923-49a5-86a2-43e6d8b96453",
"title": "GRB240102A: BOOTES-6/DPRT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "24/01/02 23:18:38 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35465"
},
"title": "GCN CIRCULAR",
"number": "35465",
"subject": "GRB240102A: BOOTES-6/DPRT optical upper limit"
},
"message_text": "Y.-D. Hu, E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland) and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 240102A by Swift (Gropp et al. GCNC 35461), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) observed the GRB location starting on Jan. 2, 18:41 UT (~ 1.1 hours after trigger) in different optical bands. No new optical source is detected on the co-added images (2 x 60 s, clear-filter) within the Swift/XRT error box down to 20.2 mag. Further imaging is ongoing.\n\nWe thank the staff at Boyden Observatory for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35465.",
"published": "2024-01-02T23:18:48.590754Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-02T23:18:48.590769Z",
"modified": "2024-01-02T23:18:48.597587Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5673,
"topic": "gcn.circular",
"uuid": "ddeea511-57ee-41b1-bdb0-bb3b1b8d5da5",
"title": "Fermi trigger No 725857207: 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": "24/01/03 00:31:01 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35466"
},
"title": "GCN CIRCULAR",
"number": "35466",
"subject": "Fermi trigger No 725857207: 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-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 GRB240102.13 (trigger No 725857207,12h 04m 45.60s , -16d 33m 36.0s, R=1.99) errorbox 29555 sec after notice time and 72382 sec after trigger time at 2024-01-02 23:06:24 UT, with upper limit up to 14.2 mag. The observations began at zenith distance = 71 deg. The sun altitude is -18.3 deg.\n\nThe galactic latitude b = 45 deg., longitude l = 288 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#48394\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 72390 | 2024-01-02 23:06:24 | MASTER-Tunka | (12h 08m 29.91s , -19d 22m 13.7s) | C | 15 | 14.1 |\n 72417 | 2024-01-02 23:06:51 | MASTER-Tunka | (12h 07m 49.80s , -17d 29m 14.6s) | C | 15 | 14.2 |\n 72445 | 2024-01-02 23:07:21 | MASTER-Tunka | (12h 16m 18.51s , -17d 29m 19.9s) | C | 10 | 14.1 |\n 72483 | 2024-01-02 23:08:02 | MASTER-Tunka | (11h 53m 08.38s , -15d 34m 47.7s) | C | 5 | 13.7 |\n 72503 | 2024-01-02 23:08:22 | MASTER-Tunka | (12h 00m 39.66s , -15d 33m 13.3s) | C | 5 | 13.7 |\nFilter C is a clear (unfiltred) band.\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/35466.",
"published": "2024-01-03T00:31:11.197343Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T00:31:11.197362Z",
"modified": "2024-01-03T00:31:11.203656Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5674,
"topic": "gcn.circular",
"uuid": "7e793381-62fd-4ad1-9673-1bf169ba17e5",
"title": "GRB 240102A: LCOGT Optical Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
"data": {
"date": "24/01/03 01:01:40 GMT",
"from": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35467"
},
"title": "GCN CIRCULAR",
"number": "35467",
"subject": "GRB 240102A: LCOGT Optical Upper Limits"
},
"message_text": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the Swift GRB 240102A (Gropp et al., GCN 35461) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on January 2, from 23:34 to January 3 00:07 UT (corresponding to 6.00 to 6.55 hours after the GRB trigger time) with the sdss r and i filters.\n\nWe performed a series of 3x300s exposures in each band. We do not detect an uncatalogued source within the XRT error region in either band. This result is consistent with other optical upper limits (Hu et al., GCN 35465).\n\nThe following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:\n\nr > 22.9\ni > 22.3\n\nThese magnitudes are not corrected for galactic extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35467.",
"published": "2024-01-03T01:01:51.454487Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T01:01:51.454503Z",
"modified": "2024-01-03T01:01:51.461768Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5675,
"topic": "gcn.circular",
"uuid": "1efbc482-5cc3-4bb9-b586-883f489cda6d",
"title": "GRB 240102A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/03 07:00:54 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35469"
},
"title": "GCN CIRCULAR",
"number": "35469",
"subject": "GRB 240102A: Swift-XRT refined Analysis"
},
"message_text": "J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.\nLeicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo\n(INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU) and P.A. Evans report\non behalf of the Swift-XRT team:\n\nWe have analysed 6.6 ks of XRT data for GRB 240102A, from 113 s to 28.3\nks after the BAT trigger. The data comprise 91 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. The best available XRT position\n (using the promptly downlinked event data, the XRT-UVOT alignment and\nmatching UVOT field sources to the USNO-B1 catalogue) is RA, Dec 96.83800, -20.04076 which is equivalent to:\n\nRA (J2000): 06 27 21.12\nDec(J2000): -20 02 26.7\n\nwith an uncertainty of 1.9 arcsec (radius, 90% confidence).\n\nThe late-time light curve (from T0+4.7 ks) can be modelled with a\npower-law decay with a decay index of alpha=0.5 (+/-0.3).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.74 (+0.11, -0.10). The\nbest-fitting absorption column is 3.3 (+0.6, -0.5) x 10^21 cm^-2, in\nexcess of the Galactic value of 2.3 x 10^21 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 4.3 x 10^-11 (5.7 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the WT-mode spectrum is thus:\nTotal column:\t 3.3 (+0.6, -0.5) x 10^21 cm^-2\nGalactic foreground: 2.3 x 10^21 cm^-2\nExcess significance: 3.1 sigma\nPhoton index:\t 1.74 (+0.11, -0.10)\n\nIf the light curve continues to decay with a power-law decay index of\n0.5, the count rate at T+24 hours will be 9.8 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.2 x\n10^-13 (5.6 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/01205899.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35469.",
"published": "2024-01-03T07:01:11.984749Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T07:01:11.984768Z",
"modified": "2024-01-03T07:01:11.993494Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5676,
"topic": "gcn.circular",
"uuid": "2844513e-e292-4d35-a32e-b79280f950b2",
"title": "GRB 240101B: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/03 09:51:11 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35470"
},
"title": "GCN CIRCULAR",
"number": "35470",
"subject": "GRB 240101B: Swift-XRT refined Analysis"
},
"message_text": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore\n(U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G.\nBernardini (INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU), A.\nTohuvavohu (U. Toronto) and P.A. Evans report on behalf of the\nSwift-XRT team:\n\nWe have analysed 6.9 ks of XRT data for GRB 240101B, from 138 s to\n126.6 ks after the BAT trigger. The data comprise 189 s in Windowed\nTiming (WT) mode (the first 12 s were taken while Swift was slewing)\nwith the remainder in Photon Counting (PC) mode.\n\nThe late-time light curve (from T0+5.0 ks) can be modelled with a\npower-law decay with a decay index of alpha=0.80 (+0.33, -0.29).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 2.28 (+0.14, -0.13). The\nbest-fitting absorption column is 6.5 (+/-0.8) x 10^21 cm^-2, in\nexcess of the Galactic value of 2.9 x 10^21 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 2.39 (+0.29, -0.27)\nand a best-fitting absorption column of 7.9 (+2.0, -1.8) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum is 3.8 x 10^-11 (9.4 x 10^-11) erg cm^-2\ncount^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 7.9 (+2.0, -1.8) x 10^21 cm^-2\nGalactic foreground: 2.9 x 10^21 cm^-2\nExcess significance: 4.7 sigma\nPhoton index:\t 2.39 (+0.29, -0.27)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01205744.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35470.",
"published": "2024-01-03T09:51:22.378454Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T09:51:22.378469Z",
"modified": "2024-01-03T09:51:22.385476Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6540,
"topic": "gcn.circular",
"uuid": "f5b6ae26-4a31-47e4-b175-f7af4a5ca523",
"title": "LIGO/Virgo/KAGRA S240413p: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "24/04/13 21:19:18 GMT",
"from": "carl.haster@unlv.edu",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36082"
},
"title": "GCN CIRCULAR",
"number": "36082",
"subject": "LIGO/Virgo/KAGRA S240413p: 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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240413p (GCN Circular 36075).\nParameter 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/S240413p\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 39 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(10h47m, +07d40m, 7.94d, 1.56d, 130.09d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 526 +/- 101 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/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36082.",
"published": "2024-04-13T21:19:38.014643Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-13T21:19:38.014658Z",
"modified": "2024-04-13T21:19:38.024097Z",
"nonlocalizedevents": [
{
"event_id": "S240413p"
}
],
"targets": []
},
{
"id": 5677,
"topic": "gcn.circular",
"uuid": "98009e3c-336e-41db-8e26-c2d83ca830ba",
"title": "GRB 240102A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/03 10:00:18 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35471"
},
"title": "GCN CIRCULAR",
"number": "35471",
"subject": "GRB 240102A: 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 4654 s of XRT Photon Counting mode data and 7 UVOT\nimages for GRB 240102A, 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 = 96.83931, -20.04096 which is equivalent\nto:\n\nRA (J2000): 06h 27m 21.43s\nDec (J2000): -20d 02' 27.5\"\n\nwith an uncertainty of 2.2 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35471.",
"published": "2024-01-03T10:00:29.414959Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T10:00:29.414974Z",
"modified": "2024-01-03T10:00:29.422630Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5836,
"topic": "gcn.circular",
"uuid": "b6484a10-60ba-43dd-a37c-a1eea9164863",
"title": "GRB 240115B: Fermi GBM Detection",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "24/01/16 20:10:53 GMT",
"from": "sumanbala2210@gmail.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35549"
},
"title": "GCN CIRCULAR",
"number": "35549",
"subject": "GRB 240115B: Fermi GBM Detection"
},
"message_text": "R. Hamburg (CNRS/IN2P3), S. Bala (USRA), and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 16:45:37.62 UT on 15 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240115B (trigger 727029942/240115698). GRB 240115B\nwas also localized by INTEGRAL (S. Mereghetti et al. 2024, GCN 35541).\n\nThe angle from the Fermi LAT boresight is 97 degrees.\n\nThe GBM light curve consists of multiple peaks of emission\nwith a duration (T90) of about 163 s (50-300 keV).\nThe time-averaged spectrum from T0-26.63 s to T0+47.11 s\nis best fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.73 +/- 0.11,\nand the cutoff energy parameterized as Epeak, is 125 +/- 10.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.13 +/- 0.26)E-06 erg/cm^2. The 1-sec peak photon flux measured\n starting from T0+17.6 s in the 10-1000 keV band is 2.6 +/- 0.3 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35549.",
"published": "2024-01-16T20:10:59.207741Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-16T20:10:59.207755Z",
"modified": "2024-01-16T20:10:59.213772Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5680,
"topic": "gcn.circular",
"uuid": "267445dc-b81e-4b6f-bb75-0c12e7a97ca5",
"title": "GRB 240101B: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
"data": {
"date": "24/01/03 14:03:29 GMT",
"from": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35472"
},
"title": "GCN CIRCULAR",
"number": "35472",
"subject": "GRB 240101B: Swift-BAT refined analysis"
},
"message_text": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nM. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 240101B (trigger #1205744)\n(Cenko, et al., GCN Circ. 35449). The BAT ground-calculated position is\nRA, Dec = 352.147, 51.646 deg which is\n RA(J2000) = 23h 28m 35.3s\n Dec(J2000) = +51d 38' 46.9\"\nwith an uncertainty of 3.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows a single peak from approximately T+0\nTo T+18 seconds. There is a possible precursor at T-50 sec.\n\nT90 (15-350 keV) is 43.1 +- 12.6 sec (estimated error including systematics).\nThe time-averaged spectrum from T+2.18 to T+48.32 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.70 +- 0.26. The fluence in the 15-150 keV band is 4.6 +- 0.8 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+10.28 sec in the 15-150 keV band\nis 0.5 +- 0.1 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/1205744/BA/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35472.",
"published": "2024-01-03T14:03:41.453791Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T14:03:41.453807Z",
"modified": "2024-01-03T14:03:41.462104Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5681,
"topic": "gcn.circular",
"uuid": "bbde8761-8f75-4914-b240-8c046645d76a",
"title": "GRB 240101A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
"data": {
"date": "24/01/03 14:06:48 GMT",
"from": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35473"
},
"title": "GCN CIRCULAR",
"number": "35473",
"subject": "GRB 240101A: Swift-BAT refined analysis"
},
"message_text": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC),\nM. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-10 to T+242 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 240101A (trigger #1205708)\n(Cenko, et al., GCN Circ. 35448). The trigger time, which was unavailable in the\nfirst circular was 2024-01-01 at 14:20:17.331 UTC. The BAT ground-calculated position is\nRA, Dec = 10.289, 8.540 deg which is\n RA(J2000) = 00h 41m 09.5s\n Dec(J2000) = +08d 32' 25.3\"\nwith an uncertainty of 3.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 66%.\n\nThe mask-weighted light curve shows a weak, complex structure lasting from\nAbout T-5 to T+10 seconds. T90 (15-350 keV) is 15.8 +- 6.1 sec (estimated error\nincluding systematics).\n\nThe time-averaged spectrum from T-1.94 to T+20.28 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n2.03 +- 0.34. The fluence in the 15-150 keV band is 3.3 +- 0.7 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+2.11 sec in the 15-150 keV band\nis 0.9 +- 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/1205708/BA/\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35473.",
"published": "2024-01-03T14:06:56.648254Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T14:06:56.648273Z",
"modified": "2024-01-03T14:06:56.653581Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5682,
"topic": "gcn.circular",
"uuid": "adedc13a-951e-40b0-bc0a-d049f4f4cee1",
"title": "GRB 231230A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
"data": {
"date": "24/01/03 14:07:21 GMT",
"from": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35474"
},
"title": "GCN CIRCULAR",
"number": "35474",
"subject": "GRB 231230A: Swift-BAT refined analysis"
},
"message_text": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 231230A (trigger #1205319)\n(Moss, et al., GCN Circ. 35436). The BAT ground-calculated position is\nRA, Dec = 245.223, 58.132 deg which is\n RA(J2000) = 16h 20m 53.5s\n Dec(J2000) = +58d 07' 54.2\"\nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 35%.\n\nThe mask-weighted light curve shows a complex structure extending from\naround T+0 to T+20. T90 (15-350 keV) is 15.2 +- 0.9 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T+0.26 to T+17.26 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.28 +- 0.10. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+7.64 sec in the 15-150 keV band\nis 2.2 +- 0.4 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/1205319/BA/\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35474.",
"published": "2024-01-03T14:07:27.694006Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T14:07:27.694020Z",
"modified": "2024-01-03T14:07:27.700113Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5683,
"topic": "gcn.circular",
"uuid": "261bc948-0dbc-499f-986e-f038ae985a5c",
"title": "GRB 240102A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Alexander Belles at PSU <aub1461@psu.edu>",
"data": {
"date": "24/01/03 15:38:51 GMT",
"from": "Alexander Belles at PSU <aub1461@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35475"
},
"title": "GCN CIRCULAR",
"number": "35475",
"subject": "GRB 240102A: Swift/UVOT Upper Limits"
},
"message_text": "A. Belles (PSU) and J. D. Gropp (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240102A\n113 s after the BAT trigger (Gropp et al., GCN Circ. 35461).\nNo optical afterglow consistent with the XRT position\n(Goad et al., GCN Circ. 35471) is 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 135 285 147 >20.7\nu_FC 294 544 246 >19.9\nwhite 135 1196 353 >21.1\nv 113 1246 90 >18.8\nb 550 1172 58 >19.5\nu 294 1314 299 >20.0\nw1 676 1295 78 >19.0\nm2 823 1270 58 >18.7\nw2 600 1221 78 >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.176 in the direction of the burst\n(Schlegel et al. 1998).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35475.",
"published": "2024-01-03T15:39:07.971949Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T15:39:07.971966Z",
"modified": "2024-01-03T15:39:07.979095Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5684,
"topic": "gcn.circular",
"uuid": "b83cd859-a44e-4617-925c-917ff077e768",
"title": "GRB 240102A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Amy <yarleen@gmail.com>",
"data": {
"date": "24/01/03 23:33:27 GMT",
"from": "Amy <yarleen@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35476"
},
"title": "GCN CIRCULAR",
"number": "35476",
"subject": "GRB 240102A: Swift-BAT refined analysis"
},
"message_text": "M. J. Moss (GSFC), S. D. Barthelmy (GSFC),\nJ.D. Gropp (PSU), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 240102A (trigger #1205899)\n(Gropp et al., GCN Circ. 35461). The BAT ground-calculated position is\nRA, Dec = 96.848, -20.011 deg which is\n RA(J2000) = 06h 27m 23.5s\n Dec(J2000) = -20d 00' 39.0\"\nwith an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve show some weak emission that starts at ~T+8 s\nand ends at ~T+140 s. T90 (15-350 keV) is 119.00 +- 30.59 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T+8.00 to T+142.00 sec is best fit by a\nsimple\npower-law model. The power law index of the time-averaged spectrum is\n2.00 +- 0.22. The fluence in the 15-150 keV band is 8.5 +- 1.3 x 10^-7\nerg/cm2.\nThe 1-sec peak photon flux measured from T+65.00 sec in the 15-150 keV band\nis 0.4 +- 0.1 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/1205899/BA/\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35476.",
"published": "2024-01-03T23:33:41.289858Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-03T23:33:41.289877Z",
"modified": "2024-01-03T23:33:41.297556Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5685,
"topic": "gcn.circular",
"uuid": "f2819e36-fb63-42f8-8344-0a7fafc0eddd",
"title": "GRB 231220A: Swift-UVOT upper limit",
"submitter": "Hop gcn.circular",
"authors": "noelklin@umbc.edu",
"data": {
"date": "24/01/04 03:26:25 GMT",
"from": "noelklin@umbc.edu",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35477"
},
"title": "GCN CIRCULAR",
"number": "35477",
"subject": "GRB 231220A: Swift-UVOT upper limit"
},
"message_text": "N. Klingler (UMBC/NASA-GSFC/CRESST II) reports on behalf of the Swift-UVOT team:\n\nSwift-UVOT has performed follow-up observations of the Swift-BAT/GUANO-detected and Fermi-GBM-detected GRB 231220A, collecting 2.6 ks of data between T0+35.2 ks and T0+47.8 ks. No candidate counterpart was detected. The 3 sigma limiting (AB) magnitude in the White filter near the center of the BAT/GUANO localization (GCN 35409) is >23.20.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35477.",
"published": "2024-01-04T03:26:35.666063Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-04T03:26:35.666079Z",
"modified": "2024-01-04T03:26:35.673686Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
