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{
"count": 257459,
"next": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=700&ordering=topic",
"previous": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=500&ordering=topic",
"results": [
{
"id": 1916,
"topic": "gcn.circular",
"uuid": "34f3c269-9798-4cb4-aee1-6ac986eb417b",
"title": "LIGO/Virgo/KAGRA S230808i: Identification of a GW unmodeled transient candidate",
"submitter": "Hop gcn.circular",
"authors": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"data": {
"date": "23/08/08 05:18:56 GMT",
"from": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"title": "GCN CIRCULAR",
"number": "34366",
"subject": "LIGO/Virgo/KAGRA S230808i: Identification of a GW unmodeled transient candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the unmodeled transient candidate S230808i during real-\ntime processing of data from LIGO Hanford Observatory (H1) and LIGO\nLivingston Observatory (L1) at 2023-08-08 04:03:46.430 UTC (GPS time:\n1375502644.430). The candidate was found by the CWB [1] analysis\npipeline.\n\nS230808i is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 6.9e-11 Hz, or about one in 1e3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230808i\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * cwb.multiorder.fits,0, an initial localization generated by cWB\n[1], distributed via GCN notice about 2 minutes after the candidate\nevent time.\n * cwb.multiorder.fits,1, an initial localization generated by cWB\n[1], distributed via GCN notice about 7 minutes after the candidate\nevent time.\n\nThe preferred sky map at this time is cwb.multiorder.fits,1. For the\ncwb.multiorder.fits,1 sky map, the 90% credible region is 7195 deg2.\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDcxOTQyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4BGkZZUppGSFAen10MN1Dx57lGuXTN_FeYTZAd-_eYI\n\n",
"published": "2023-08-08T05:19:11.523778Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T05:19:11.523797Z",
"modified": "2023-08-08T05:19:11.531182Z",
"nonlocalizedevents": [
{
"event_id": "S230808i"
}
],
"targets": []
},
{
"id": 2541,
"topic": "gcn.circular",
"uuid": "20528ef1-4e3a-4666-8615-b42d85e6d12b",
"title": "GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "23/08/27 20:59:21 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"title": "GCN CIRCULAR",
"number": "34581",
"subject": "GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)"
},
"message_text": "B. Biltzinger, T. Preis, J. Burgess & J. Greiner (all MPE Garching) report:\n\nThe public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger\n at 18:17:52 on 27 Aug. 2023 were automatically fitted for spectrum\nand sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;\nBerlato et al. 2019, ApJ 873, 60).\n\nThe best-fit position (1 sigma statistical errors) is:\nRA(2000.0) = 320.1+/-0.9 deg\nDecl.(2000.0) = -20.3+/-0.9 deg\nWe estimate an additional systematic error of 1 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB230827762/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB230827762/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB230827762/json\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMTY5OTY2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.DebtKY3IQ2wv3KigPyzLLshBI9zX9EmChUWPAmR_-7c\n\n",
"published": "2023-08-27T20:59:33.801589Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-27T20:59:33.801616Z",
"modified": "2023-08-27T20:59:33.807609Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1920,
"topic": "gcn.circular",
"uuid": "d26a51c8-782d-4633-8aab-a578fce678e9",
"title": "LIGO/Virgo/KAGRA S230808i: retraction of a GW unmodeled transient candidate",
"submitter": "Hop gcn.circular",
"authors": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"data": {
"date": "23/08/08 08:05:45 GMT",
"from": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"title": "GCN CIRCULAR",
"number": "34367",
"subject": "LIGO/Virgo/KAGRA S230808i: retraction of a GW unmodeled transient candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nThe trigger S230808i is no longer considered to be a candidate of interest: pipeline experts consider this trigger is of low significance.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDgxOTUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Kda-JuDOITzC5LDAEf4KiJcdPKzRpiY556wGYVqpgSk\n\n",
"published": "2023-08-08T08:05:55.983616Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T08:05:55.983634Z",
"modified": "2023-08-08T08:05:55.990594Z",
"nonlocalizedevents": [
{
"event_id": "S230808i"
}
],
"targets": []
},
{
"id": 1921,
"topic": "gcn.circular",
"uuid": "a4e1d6fb-c239-45c9-99a2-b77dfe942e2e",
"title": "GRB 230805B : MITSuME Akeno optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Narikazu Higuchi at Tokyo Tech <higuchi@hp.phys.titech.ac.jp>",
"data": {
"date": "23/08/08 10:29:05 GMT",
"from": "Narikazu Higuchi at Tokyo Tech <higuchi@hp.phys.titech.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34368",
"subject": "GRB 230805B : MITSuME Akeno optical upper limits"
},
"message_text": "N. Higuchi, I. Takahashi, M. Sasada, M. Niwano, S. Sato, S. Hayatsu, R. Hosokawa, H. Seki, H. Takei, Y. Yatsu (Tokyo Tech) and N. Kawai (Riken) report on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 230805B (Cenko et al. GCN Circular #34339) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno.\n\nThe observation started at 2023-8-05 11:25:51 UT (120 seconds after the Swift/BAT trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the error region (Osborne et al. GCN Circular #34353). We obtained the 5-sigma limits of the stacked images as follows.\n\nT0+[sec] | MID-UT | T-EXP[sec] | 5-sigma limits\n------------------------------------------------------------------------------------------------\n1117 | 2023-08-05 11:42:28 | 240.0 | g'>18.5, Rc>18.5, Ic>17.9\n4357 | 2023-08-05 12:36:28 | 840.0 | g'>18.9, Rc>19.0, Ic>18.5\n------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\n\nWe used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g', Rc and Ic band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDkwNTUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.u1Ajhj7yItWxbLMyQ92xfs9uopbbJnPpa9mPToPDi_Q\n\n",
"published": "2023-08-08T10:29:17.770467Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T10:29:17.770486Z",
"modified": "2023-08-08T10:29:17.778334Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1922,
"topic": "gcn.circular",
"uuid": "7dd1da5d-7269-42fd-844c-5236be2881c4",
"title": "GRB 230808A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/08 10:59:45 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34369",
"subject": "GRB 230808A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 10:49:12 UT on 8 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230808A (trigger 713184557.782692 / 230808451).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 81.6, Dec = 58.5 (J2000 degrees, equivalent to J2000 05h 26m, 58d 30'), with a statistical uncertainty of 2.2 degrees.\n\nThe angle from the Fermi LAT boresight is 36.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230808451/quicklook/glg_skymap_all_bn230808451.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/bn230808451/quicklook/glg_healpix_all_bn230808451.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230808451/quicklook/glg_lc_medres34_bn230808451.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDkyMzkxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ihyk9nShfpCC8H-Xayv0tAEgA2Z521SSSI4yilLVY0M\n\n",
"published": "2023-08-08T10:59:57.085847Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T10:59:57.085872Z",
"modified": "2023-08-08T10:59:57.093906Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1923,
"topic": "gcn.circular",
"uuid": "ef07df1b-592d-4034-94dc-f7d48f542e69",
"title": "ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova",
"submitter": "Hop gcn.circular",
"authors": "Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo@ucd.ie>",
"data": {
"date": "23/08/08 15:51:10 GMT",
"from": "Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo@ucd.ie>",
"title": "GCN CIRCULAR",
"number": "34370",
"subject": "ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova"
},
"message_text": "A. Martin-Carrillo (UCD), B. Schneider (MIT), T. Laskar (Utah), B. P. Gompertz (U. Birmingham), D. B. Malesani (Radboud and DAWN/NBI), A. de Ugarte Postigo (OCA/CNRS), A. J. Levan (Radboud), G. Finneran (UCD), J.F. Agui Fernandez (IAA-CSIC), C.C. Thoene (ASU-CAS), V. D'Elia (ASI-SSDC and INAF-OAR) and L. Izzo (INAF-OACN and DARK/NBI) report on behalf of a larger collaboration:\n\nWe obtained photometric observations of the orphan GRB afterglow ZTF23aaoohpy/AT2023lcr (Andreoni et al., GCN 3402; Swain et al., GCN 34022; Kumar et al., GCN 34025; Adami et al., GCN 34030; Perley et al., GCN 34031; Jiang et al., GCN 34040; Chen et al., GCN 34043) with the James Webb Space Telescope on 7 August 2023 (DDT program 4554, PI Martin-Carrillo). This was about 50.6 days after the likely explosion epoch (Gompertz et al., GCN 34023). Observations were obtained with the NIRCam instrument in the F115W, F150W, F277W, and F356W filters.\n\nAt the location of the optical/NIR transient, we detect a point-like source in all four bands, with F115W(AB) ~ 25.48 +/- 0.20. A fainter, extended source is observed about 0.5\" to the S-W, which could be the host galaxy of AT 2023lcr.\n\nThese observations are in excess of the expected power-law decay of the GRB afterglow and are consistent with a supernova component.\n\nFurther analysis and observations are ongoing.\n\nWe thank the staff of STScI for their work to get these observations rapidly scheduled, in particular Alison Vick, Tony Keyes, Mario Gennaro and Armin Rest.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTA5ODc1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Y3aAqYo7QARJbZNcBV2Yg79QMnHV5o8b1A6hq2mzk5A\n\n",
"published": "2023-08-08T15:51:24.541293Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T15:51:24.541310Z",
"modified": "2023-08-08T15:51:24.549114Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1924,
"topic": "gcn.circular",
"uuid": "f23a5520-8ca7-46ed-ac2d-b944d85b75e9",
"title": "Fermi trigger No 713205976: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/08 17:15:48 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34371",
"subject": "Fermi trigger No 713205976: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230808.70 (trigger No 713205976,13h 38m 48.00s , -22d 12m 36.0s, R=2.42) errorbox 557 sec after notice time and 589 sec after trigger time at 2023-08-08 16:56:01 UT, with upper limit up to 18.6 mag. Observations started at twilight. The observations began at zenith distance = 25 deg. The sun altitude is -10.9 deg.\n\nThe galactic latitude b = 39 deg., longitude l = 318 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"51814\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 620 | 2023-08-08 16:56:01 | MASTER-SAAO | (13h 38m 29.74s , -22d 07m 36.0s) | C | 60 | 17.3 |\n 680 | 2023-08-08 16:56:01 | MASTER-SAAO | (13h 38m 29.73s , -22d 07m 35.9s) | C | 180 | 18.1 | Coadd\n 620 | 2023-08-08 16:56:01 | MASTER-SAAO | (13h 37m 33.96s , -22d 09m 24.9s) | C | 60 | 17.8 |\n 680 | 2023-08-08 16:56:01 | MASTER-SAAO | (13h 37m 33.96s , -22d 09m 24.9s) | C | 180 | 18.6 | Coadd\n 711 | 2023-08-08 16:57:32 | MASTER-SAAO | (13h 38m 35.47s , -22d 07m 06.0s) | C | 60 | 17.4 |\n 711 | 2023-08-08 16:57:32 | MASTER-SAAO | (13h 37m 39.62s , -22d 08m 54.2s) | C | 60 | 17.9 |\n 802 | 2023-08-08 16:59:03 | MASTER-SAAO | (13h 38m 32.66s , -22d 05m 36.2s) | C | 60 | 17.5 |\n 802 | 2023-08-08 16:59:03 | MASTER-SAAO | (13h 37m 36.76s , -22d 07m 24.4s) | C | 60 | 18.1 |\n 881 | 2023-08-08 17:00:22 | MASTER-SAAO | (13h 38m 32.64s , -22d 07m 26.9s) | C | 60 | 17.8 |\n 881 | 2023-08-08 17:00:22 | MASTER-SAAO | (13h 37m 36.69s , -22d 09m 14.8s) | 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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTE0OTU0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nLH51Qhk4gpsoNN08ApNQin76ReTId-TMaCCYfYMx0Q\n\n",
"published": "2023-08-08T17:16:00.995570Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T17:16:00.995588Z",
"modified": "2023-08-08T17:16:01.005384Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1925,
"topic": "gcn.circular",
"uuid": "b707c027-dee7-4038-b44c-478caf13e4af",
"title": "The Fermi GBM Trigger 713134237 / 230807868 is not associated with LIGO/Virgo/KAGRA S230807f.",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/08/08 18:26:24 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34372",
"subject": "The Fermi GBM Trigger 713134237 / 230807868 is not associated with LIGO/Virgo/KAGRA S230807f."
},
"message_text": "S. Dalessi (UAH) reports on behalf of the Fermi-GBM Team:\n\nAt 20:50:32.62 on 07 August 2023, the Fermi Gamma-ray Burst Monitor triggered onboard to the event labeled as 713134237 / 230807868 this trigger occurred 15s before the LVK Event S230807f (GCN 34360).\n\nThe trigger is likely due to a solar flare and therefore is not associated to S230807f.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTE5MTkwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.sxBQ2RYDTRPTJHjm4O07QmufhabpGpDqyy7ospIzRjM\n\n",
"published": "2023-08-08T18:26:35.071762Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T18:26:35.071833Z",
"modified": "2023-08-08T18:26:35.081633Z",
"nonlocalizedevents": [
{
"event_id": "S230807f"
}
],
"targets": []
},
{
"id": 1926,
"topic": "gcn.circular",
"uuid": "29fbaacc-465a-4514-bb32-10957f3f6c97",
"title": "GRB 230808B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/08 18:50:46 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34373",
"subject": "GRB 230808B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 16:46:11 UT on 8 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230808B (trigger 713205976.382378 / 230808699).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 204.7, Dec = -22.2 (J2000 degrees, equivalent to J2000 13h 38m, -22d 11'), with a statistical uncertainty of 2.4 degrees.\n\nThe angle from the Fermi LAT boresight is 48.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230808699/quicklook/glg_skymap_all_bn230808699.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/bn230808699/quicklook/glg_healpix_all_bn230808699.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230808699/quicklook/glg_lc_medres34_bn230808699.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTIwNjUxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.rKolTEj_DndD9Lxo8BEYPkm15UCpIfI3T1_xVG3WlmE\n\n",
"published": "2023-08-08T18:50:57.276694Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T18:50:57.276714Z",
"modified": "2023-08-08T18:50:57.284138Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1927,
"topic": "gcn.circular",
"uuid": "78cf4e4a-02a2-4975-8775-121e3637390f",
"title": "Fermi trigger No 713136868: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/08 19:31:18 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34374",
"subject": "Fermi trigger No 713136868: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB230807.90 (trigger No 713136868,11h 30m 19.92s , +20d 55m 58.8s, R4.98) errorbox 804 sec after notice time and 835 sec after trigger time at 2023-08-07 21:48:19 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 76 deg. The sun altitude is -29.6 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230807.90 errorbox 4784 sec after notice time and 4815 sec after trigger time at 2023-08-07 22:54:39 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 69 deg. The sun altitude is -11.3 deg.\n\nThe galactic latitude b = 71 deg., longitude l = 229 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"51406\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 926 | 2023-08-07 21:48:19 | MASTER-Tavrida | (13h 04m 15.18s , +46d 38m 55.0s) | C | 180 | 17.8 |\n 4905 | 2023-08-07 22:54:39 | MASTER-OAFA | (14h 02m 46.57s , +35d 27m 44.2s) | C | 180 | 16.3 |\n 5127 | 2023-08-07 22:58:20 | MASTER-OAFA | (13h 53m 01.26s , +35d 27m 54.2s) | C | 180 | 15.1 |\n 5349 | 2023-08-07 23:02:02 | MASTER-OAFA | (12h 35m 45.79s , +03d 10m 07.7s) | C | 180 | 16.6 |\n 7760 | 2023-08-07 23:42:13 | MASTER-OAFA | (12h 12m 55.17s , -02d 26m 15.0s) | C | 180 | 13.0 |\n 8605 | 2023-08-07 23:56:19 | MASTER-OAFA | (12h 27m 24.53s , -00d 31m 40.8s) | C | 180 | 13.0 |\n 8818 | 2023-08-07 23:59:51 | MASTER-OAFA | (12h 06m 17.94s , -04d 20m 47.4s) | C | 180 | 12.9 |\n 9030 | 2023-08-08 00:03:23 | MASTER-OAFA | (12h 14m 25.83s , -04d 20m 33.3s) | C | 180 | 13.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTIzMDg0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.YH9ew3qOyKq8xWk-l5t_0tkemrYpxZ_El8XjtxrmIz8\n\n",
"published": "2023-08-08T19:31:29.718314Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T19:31:29.718333Z",
"modified": "2023-08-08T19:31:29.726683Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1928,
"topic": "gcn.circular",
"uuid": "24015af9-8b8b-4102-8090-e12b0050cb26",
"title": "GRB 230808A: Swift/BAT-GUANO detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at University of Alabama <delauj2@gmail.com>",
"data": {
"date": "23/08/08 21:34:24 GMT",
"from": "Jimmy DeLaunay at University of Alabama <delauj2@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34375",
"subject": "GRB 230808A: Swift/BAT-GUANO detection of a burst"
},
"message_text": "James DeLaunay (UAlabama), Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 230808A onboard (T0: 2023-08-08T10:49:12.78 UTC, Fermi GBM Trig 713184557, GCN 34369).\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 with a sqrt(TS) of 9.6 in a 16.384 s analysis time bin, starting at T0 + 16.384 s.\n\nNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 12.1.\nThe Fermi GBM localization (GCN 34369) has this burst significantly outside of the BAT coded FOV\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTMwNDcwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.FcWcXpJKgoZZT4OI_BViJap33Ncu2Lef5qeeTEJ2bos\n\n",
"published": "2023-08-08T21:34:35.237763Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T21:34:35.237781Z",
"modified": "2023-08-08T21:34:35.245698Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6875,
"topic": "gcn.circular",
"uuid": "7d546ccd-b5da-4aaf-904d-75f91282e1cc",
"title": "LXT240402A/GRB240402B: Chandra X-ray detection",
"submitter": "Hop gcn.circular",
"authors": "muskan.yadav@students.uniroma2.eu",
"data": {
"date": "24/04/23 12:55:40 GMT",
"from": "muskan.yadav@students.uniroma2.eu",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36253"
},
"title": "GCN CIRCULAR",
"number": "36253",
"subject": "LXT240402A/GRB240402B: Chandra X-ray detection"
},
"message_text": "M. Yadav, E. Troja, Y. -H. Yang, and R. L. Becerra (U. Rome) report:\n\nFollowing the detection of the fast X-ray transient LXT 240402A (Xu et al., GCN 36016) associated with GRB 240402B (Wang et al., GCN 36017), we performed observations of the field with the Chandra X-ray Observatory starting at UT 00:48 on April 15, 2024 for a total exposure of 16 ks.\nAn X-ray source is detected with high significance at the location of the optical counterpart (Yang at al., GCN 36094).\nUsing the spectral parameters of the EP-FXT detection (Jia et al., GCN 36022) we derive an X-ray flux of 8*10^-14 erg s^-1 cm^-2 (0.5-10 keV), consistent with the Swift/XRT observations (Martin-Carrillo et al., GCN 36114).\nWe thank Pat Slane and the CXO staff for quickly arranging and executing the observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36253.",
"published": "2024-04-23T12:55:55.773683Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-23T12:55:55.773707Z",
"modified": "2024-04-23T12:55:55.782066Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1945,
"topic": "gcn.circular",
"uuid": "355bb3db-c86f-4e7a-9a61-77b90124adb8",
"title": "GRB 230805B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/09 15:43:08 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34376",
"subject": "GRB 230805B: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 230805B which was also detected by Swift-BAT (Cenko et al., GCN Circ. 34339), and Fermi-GBM (Mangan et al., GCN Circ. 34357).\n\nThe source was detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-05 11:23:33.50 UTC. The measured peak count rate associated with the burst is 165 (+36, -38) counts/s above the background in the combined data of three quadrants (out of four), with a total of 1304 (+507, -508) counts. The local mean background count rate was 337 (+1, -2) counts/s. Using cumulative rates, we measure a T90 of 54 (+27, -25) s.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTk1Nzk0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.vkfaKa_YwV7o8RWkIqgR9fi0gUECY9HPww541HxjaqY\n\n",
"published": "2023-08-09T15:43:24.508897Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-09T15:43:24.508913Z",
"modified": "2023-08-09T15:43:24.516039Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1946,
"topic": "gcn.circular",
"uuid": "7ddf8fa3-da35-4c1c-a4c3-1fb738b9479a",
"title": "GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit",
"submitter": "Hop gcn.circular",
"authors": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
"data": {
"date": "23/08/09 19:55:18 GMT",
"from": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34377",
"subject": "GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit"
},
"message_text": "Giulio Scarfì (Gruppo Astronomia Digitale - Iota Scorpii Observatory, La\nSpezia,\nItaly)\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nUnione Astrofili Italiani (UAI)\nreport:\n\nWe imaged the field of GRB 230805B detected by SWIFT(trigger 11:23:51 UT)\nwith the telescope GSO 16â of Iota Scorpii Observatory, La Spezia Italy\n\nMember of:\n\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nGAD - Gruppo Astronomia Digitale.\n\nThe observations started 550 min after the GRB trigger, at the end of\ntwilight,\nwith a Ritchey Cretien D=406 mm with reducer F/D=6,15.\nWeather conditions were very good.\n\nWe co-added 6 exposures of 300 sec each.\n\n\nStart T0+     End T0+      R lim\n550 min       581 min        20\n\n\nWe did not found any optical counterpart in the error box of the XRT\ncandidate.\nPage et al. GCN 34339\n\nMagnitudes were estimated with the Gaia EDR3 cat. and\nare not corrected for galactic dust extinction. 20.0\n\nReference:\nhttps://www.parcodellestelle.com/\n\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNjEwOTI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.sEYJ4FSynCnGDSRJXWOH1GSkMD3I9op2zu2r9Yekf-0\n\n",
"published": "2023-08-09T19:55:31.720042Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-09T19:55:31.720067Z",
"modified": "2023-08-09T19:55:31.729201Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1959,
"topic": "gcn.circular",
"uuid": "3840ffa9-78c2-4722-98b8-89011677bbaf",
"title": "LIGO/Virgo/KAGRA S230810af: Retraction of GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Jerome Novak <jerome.novak@obspm.fr>",
"data": {
"date": "23/08/10 11:19:49 GMT",
"from": "Jerome Novak <jerome.novak@obspm.fr>",
"title": "GCN CIRCULAR",
"number": "34378",
"subject": "LIGO/Virgo/KAGRA S230810af: Retraction of GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S230810af is no longer considered to be a candidate of interest. This candidate included at least one detection prior to the merge time but no significant detection that included the merger, which indicates this candidate is likely a noise transient.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNjY2MzkzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.w5a3_hOpSJKLdGo8wnHnbgj_Gs6q5FAh-W0aFZV5_qg\n\n",
"published": "2023-08-10T11:20:05.162341Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-10T11:20:05.162359Z",
"modified": "2023-08-10T11:20:05.165924Z",
"nonlocalizedevents": [
{
"event_id": "S230810a"
}
],
"targets": []
},
{
"id": 1960,
"topic": "gcn.circular",
"uuid": "a6cf8fd0-f225-4e2d-ac74-205d5ef525e6",
"title": "GRB 230805B: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Sibasish Laha at NASA-GSFC <slaha@umbc.edu>",
"data": {
"date": "23/08/10 16:51:21 GMT",
"from": "Sibasish Laha at NASA-GSFC <slaha@umbc.edu>",
"title": "GCN CIRCULAR",
"number": "34379",
"subject": "GRB 230805B: Swift-BAT refined analysis"
},
"message_text": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC),D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-40 to T+200 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 230805B (trigger #1183217)\n(Cenko et al., GCN Circ. 34339). The BAT ground-calculated position is\nRA, Dec = 207.738, 31.190 deg which is\n RA(J2000) = 13h 50m 57.2s\n Dec(J2000) = +31d 11' 23.0\"\nwith an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 41%.\n\nThe BAT light curve shows a complex structure with a duration of ~ 100 sec.\nT90 (15-350 keV) is 93.77 +- 18.83 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-21.60 to T+103.27 sec is best fit by a\nsimple\npower-law model. The power law index of the time-averaged spectrum is\n1.36 +- 0.20. The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-06\nerg/cm2.\nThe 1-sec peak photon flux measured from T-17.66 sec in the 15-150 keV band\nis 1.2 +- 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\nhttp://gcn.gsfc.nasa.gov/notices_s/1183217/BA/\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNjg2Mjg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.MzI61OTNhF8ORnCnoiMD2E0W7hoVTLOzOKeAa63JGAw\n\n",
"published": "2023-08-10T16:51:36.502278Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-10T16:51:36.502314Z",
"modified": "2023-08-10T16:51:36.506970Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1970,
"topic": "gcn.circular",
"uuid": "4ad85de7-68bd-4ae7-aa0e-a19475865fb9",
"title": "LIGO/Virgo/KAGRA S230811n: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"data": {
"date": "23/08/11 04:07:27 GMT",
"from": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"title": "GCN CIRCULAR",
"number": "34380",
"subject": "LIGO/Virgo/KAGRA S230811n: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230811n during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-11 03:21:16.293 UTC (GPS\ntime: 1375759294.293). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230811n is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230811n\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 30 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is 955\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 2530 +/- 777 Mpc (a posteriori mean +/- standard\ndeviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNzI2ODUzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.T_rQmHN9NM3OqyNannpJfdR7H2_dapVcSQ-Ks5dbaoo\n\n",
"published": "2023-08-11T04:07:41.425935Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-11T04:07:41.425952Z",
"modified": "2023-08-11T04:07:41.430394Z",
"nonlocalizedevents": [
{
"event_id": "S230811n"
}
],
"targets": []
},
{
"id": 3287,
"topic": "gcn.circular",
"uuid": "7293209a-d9b2-4464-9de5-3f06d6dfca70",
"title": "LIGO/Virgo/KAGRA S230917af: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Tomas Ahumada Mena at Caltech <tahumada@caltech.edu>",
"data": {
"date": "23/09/22 00:23:43 GMT",
"from": "Tomas Ahumada Mena at Caltech <tahumada@caltech.edu>",
"title": "GCN CIRCULAR",
"number": "34755",
"subject": "LIGO/Virgo/KAGRA S230917af: Zwicky Transient Facility observations"
},
"message_text": "Tomas Ahumada (CIT), Vishwajeet Swain (IITB), Shreya Anand (CIT), Robert Stein (CIT), Viraj Karambelkar (CIT), Akash Anumarlapudi (UWM), Mansi Kasliwal (CIT), Anirudh Salgundi (IITB), Gaurav Waratkar (IITB), Avery Wold (IPAC), Theophile du Laz (CIT), Simeon Reusch (DESY), Igor Andreoni (SURA), Eric Bellm (UW), Varun Bhalerao (IITB), Brad Cenko (UMD), Michael Coughlin (UMN), Brian Healy (UMN), David Kaplan (UWM), Jannis Necker (DESY), D. Perley (LJMU) report on behalf of the ZTF and GROWTH collaborations:\n\nWe observed the localization region of the LVC trigger S230917af as part of routine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al., 2019) survey operations. We obtained images in the r and g bands beginning at 2023-09-17T10:05:51 UT (8 seconds after the LVC trigger time), covering ~83% of the probability enclosed in the localization region. Our observations covered ~92% of the overlapping region between the MAXI low significance burst (GCN 34723) and the GW event.\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through Fritz (Coughlin et al. 2023), AMPEL (Nordin et al. 2019), and ZTFReST (Andreoni & Coughlin et al., 2021). 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 LVC trigger. We also run forced photometry on ZTF images (Masci et al. 2019) and require no detections before the LVC trigger.\n\nNo candidates passed our filtering criteria. Furthermore, we run forced photometry over two years of ZTF data at the center of the Swift sources circulated in Evans et al. (GCN 34736) with a 1 arcsec radius, and we queried ZTF alerts within their 90% error region. Three of the six Swift sources have previous detections and can be associated to ZTF objects. These sources are unlikely to be associated with the GW trigger:\n\nSwift name | ZTF name | JD discovery | magnitude at discovery\n---------------------------------------------------------------\nS230917af_X9 | ZTF18abvbsom | 2460152.82912 | g = 20.24\nS230917af_X1 | ZTF18abvucic | 2460206.80333 | g = 18.93\nS230917af_X10 | ZTF18abvzkzr | 2459817.80154 | g = 20.44\n\nNo predetections or alerts in the ZTF archive were found for the Swift sources S230917af_X3, S230917af_X4, and S230917af_X6. However, we note that (1) S230917af_X3 is 2.3 arcsec from a GALEX point-like UV source, at nuv = 20.03 mag, (2) S230917af_X4 is 2.5 arcsec from a Gaia source at g = 20.62 mag with a proper motion ~5.16 mas/year, and (3) S230917af_X6 is 9 arcsec from a WISE galaxy and its colors (W1-W2 = 0.9 mag, and W2-W3 = 2.6 mag) are indicative of a QSO/Seyfert galaxy.\n\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 the 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) and Kowalski (Duev et al. 2019). GROWTH India telescope is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). GROWTH-India project is supported by SERB and administered by IUSSTF, under grant number IUSSTF/PIRE Program/GROWTH/2015-16 and IUCAA.\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34755.\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjk1MzQyMjI5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.dR1Tb6xw6cwwD_quM1qrGaOHbP7q9KuUUZNEHEPvmzU\n\n",
"published": "2023-09-22T00:23:58.970057Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-22T00:23:58.970078Z",
"modified": "2023-09-22T00:23:58.979842Z",
"nonlocalizedevents": [
{
"event_id": "S230917a"
}
],
"targets": []
},
{
"id": 1980,
"topic": "gcn.circular",
"uuid": "d3a5fca6-3154-4a8f-b272-6012bfc1ad91",
"title": "GRB 230808A: Fermi GBM Detection",
"submitter": "Hop gcn.circular",
"authors": "Ava Myers at NASA GSFC <ava.myers@nasa.gov>",
"data": {
"date": "23/08/11 15:01:08 GMT",
"from": "Ava Myers at NASA GSFC <ava.myers@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34381",
"subject": "GRB 230808A: Fermi GBM Detection"
},
"message_text": "A. Myers (NPP/GSFC) and S. Lesage (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\nâAt 10:49:12.78 UT on 08 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230808A (trigger 713184557/230808451, which was also detected by Swift/BAT-GUANO (B. Person et al. 2020; GCN 34375 reported by James Delaunay). The Fermi GBM Final Real-time Localization was reported at GCN 34369.\n\nThe angle from the Fermi LAT boresight is 36 degrees.\n\nThe GBM light curve consists of a multiple-emission episode with a duration (T90) of about 62 s (50-300 keV). The time-averaged spectrum from T0-4.6 to T0+69.1 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.07 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 430 +/- 60 keV.\n\nThe event fluence (10-1000 keV) in this time interval is (1.31 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+18 s in the 10-1000 keV band is 6.4 +/- 0.3 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNzY2MDc0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7xsW01sKvVz3bbDK5RmytYuOdb631snX__7qhkBJZ0Q\n\n",
"published": "2023-08-11T15:01:24.723029Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-11T15:01:24.723046Z",
"modified": "2023-08-11T15:01:24.728834Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1993,
"topic": "gcn.circular",
"uuid": "29598385-9db1-4c62-813f-651fee416432",
"title": "LIGO/Virgo/KAGRA S230811n: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
"date": "23/08/12 03:39:18 GMT",
"from": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34382",
"subject": "LIGO/Virgo/KAGRA S230811n: 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 S230811n (GCN Circular 34380). 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/S230811n\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 810 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1905 +/- 672 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\n\nhttps://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODExNTY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.lukcGZLDDPiaAYa6HY6JsT8xmY3al_9rgX2Xv75L28s\n\n",
"published": "2023-08-12T03:39:33.944410Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T03:39:33.944426Z",
"modified": "2023-08-12T03:39:33.948031Z",
"nonlocalizedevents": [
{
"event_id": "S230811n"
}
],
"targets": []
},
{
"id": 4057,
"topic": "gcn.circular",
"uuid": "e196a9df-f1fc-4afd-a41d-67bad5c0a5d4",
"title": "LIGO/Virgo/KAGRA S231020ba: Upper limits from Fermi-GBM Observations",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "23/10/20 19:40:41 GMT",
"from": "sumanbala2210@gmail.com",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34860"
},
"title": "GCN CIRCULAR",
"number": "34860",
"subject": "LIGO/Virgo/KAGRA S231020ba: Upper limits from Fermi-GBM Observations"
},
"message_text": "S. Bala (USRA) reports on behalf of the Fermi-GBM Team:\n\nFor S231020ba (GCN 34852) and using the initial bayestar skymap, Fermi-GBM was observing 25.4% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S231020ba. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi, located at an RA\u00121.7, Dec#.2 with a radius of 67.4 degrees. We therefore set upper limits on impulsive gamma-ray emission for the GW localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128 s: 3.3 \t 4.0 \t6.6\n1.024 s: 1.3 \t 1.5 \t2.1\n8.192 s: 0.4 \t 0.4 \t0.7\n\nAssuming the median luminosity distance of 1110.8 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 0.8 0.8 2.3\n1.024s: 0.3 0.3 0.7\n8.192s: 0.1 0.1 0.2\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34860.",
"published": "2023-10-20T19:40:48.556177Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T19:40:48.556201Z",
"modified": "2023-10-20T19:40:48.562171Z",
"nonlocalizedevents": [
{
"event_id": "S231020b"
}
],
"targets": []
},
{
"id": 1997,
"topic": "gcn.circular",
"uuid": "5126e143-3138-42ae-a83e-594820956d0a",
"title": "GRB 230812A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/12 09:39:02 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34383",
"subject": "GRB 230812A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 09:28:32 UT on 12 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230812A (trigger 713525317.441558 / 230812395).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 294.2, Dec = -32.2 (J2000 degrees, equivalent to J2000 19h 36m, -32d 12'), with a statistical uncertainty of 4.5 degrees.\n\nThe angle from the Fermi LAT boresight is 71.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230812395/quicklook/glg_skymap_all_bn230812395.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/bn230812395/quicklook/glg_healpix_all_bn230812395.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230812395/quicklook/glg_lc_medres34_bn230812395.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODMzMTQ4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.kfDGaMK2y00St7VgaqIP_FutOkbkpmaFzOozdF5IpN0\n\n",
"published": "2023-08-12T09:39:15.415418Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T09:39:15.415434Z",
"modified": "2023-08-12T09:39:15.420870Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2010,
"topic": "gcn.circular",
"uuid": "79d9af52-ba10-475f-9183-01c39dc7c9c2",
"title": "Fermi trigger No 713525317: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/12 16:45:39 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34384",
"subject": "Fermi trigger No 713525317: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230812.39 (trigger No 713525317,19h 36m 48.00s , -32d 09m 36.0s, R=4.53) errorbox 569 sec after notice time and 603 sec after trigger time at 2023-08-12 09:38:35 UT, with upper limit up to 15.4 mag. The observations began at zenith distance = 83 deg. The sun altitude is -20.7 deg.\n\nThe galactic latitude b = -24 deg., longitude l = 8 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"53135\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 664 | 2023-08-12 09:38:35 | MASTER-OAFA | (19h 35m 05.13s , -32d 11m 16.7s) | C | 120 | 15.4 |\n 830 | 2023-08-12 09:41:07 | MASTER-OAFA | (19h 34m 59.66s , -32d 12m 15.9s) | C | 150 | 14.8 |\n 1046 | 2023-08-12 09:44:28 | MASTER-OAFA | (19h 35m 04.86s , -32d 12m 11.3s) | C | 180 | 14.7 |\n 1258 | 2023-08-12 09:48:00 | MASTER-OAFA | (19h 35m 01.58s , -32d 10m 31.0s) | C | 180 | 15.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODU4NzQ1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.odhoAIoLSqYQaEG2qLGY_HOUt90IjaJ5YjieD8rpW8k\n\n",
"published": "2023-08-12T16:45:53.638654Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T16:45:53.638670Z",
"modified": "2023-08-12T16:45:53.642580Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2012,
"topic": "gcn.circular",
"uuid": "c780f3d9-d50f-436d-bc8c-baee36dcb1ef",
"title": "ZTF23aaoohpy/AT2023lcr: JWST spectroscopy confirmation of an associated type Ic-BL supernova",
"submitter": "Hop gcn.circular",
"authors": "Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo@ucd.ie>",
"data": {
"date": "23/08/12 18:14:52 GMT",
"from": "Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo@ucd.ie>",
"title": "GCN CIRCULAR",
"number": "34385",
"subject": "ZTF23aaoohpy/AT2023lcr: JWST spectroscopy confirmation of an associated type Ic-BL supernova"
},
"message_text": "A. Martin-Carrillo (UCD), A. J. Levan (Radboud), A. de Ugarte Postigo (OCA/CNRS), L. Izzo (INAF-OACN and DARK/NBI), B. Schneider (MIT), T. Laskar (Utah), B. P. Gompertz (U. Birmingham), D. B. Malesani (Radboud and DAWN/NBI), G. Finneran (UCD), J.F. Agui Fernandez (IAA-CSIC), C.C. Thoene (ASU-CAS), V. D'Elia (ASI-SSDC and INAF-OAR), N.R. Tanvir (U. Leicester), P. Jakobsson (U. Iceland) and G. Pugliese (API, Amsterdam) report on behalf of a larger collaboration:\n\nWe obtained spectroscopic observations of the orphan GRB afterglow candidate ZTF23aaoohpy/AT2023lcr (Andreoni et al., GCN 3402; Swain et al., GCN 34022; Kumar et al., GCN 34025; Adami et al., GCN 34030; Perley et al., GCN 34031; Jiang et al., GCN 34040; Chen et al., GCN 34043) with the James Webb Space Telescope on 12 August 2023 (DDT program 4554, PI Martin-Carrillo). This was about 55 days (27 days rest frame) after the likely explosion epoch of the event (Gompertz et al., GCN 34023). Observations were obtained with the NIRSpec clear prism in the 0.5-5.3 micron wavelength range.\n\nAssuming a redshift of z=1.027 (Perley et al. GCN 34041), the obtained spectrum shows an excellent match to the spectrum of GRB-SN 1998bw (at 22 days) and 2017iuk (at 26 days), confirming the presence of a supernova component initially hinted by photometric observations (Martin-Carrillo et al., GCN 34370). Based on the observed spectral properties, we identify the supernova associated to ZTF23aaoohpy/AT2023lcr as a broad-lined type Ic SN similar to other SNe accompanying GRBs. To date, this is the furthest GRB-SN association with robust spectroscopic confirmation.\n\nFurther analysis and observations are ongoing.\n\nWe thank the staff of STScI for their work to get these observations rapidly scheduled, in particular Alison Vick, Tony Keyes, Mario Gennaro and Armin Rest.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODY0MDk4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.obUtPn2bxLlFxV_WK50r7MtzqFJ7xXf3ELoLg3UdMCc\n\n",
"published": "2023-08-12T18:15:03.726146Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T18:15:03.726164Z",
"modified": "2023-08-12T18:15:03.729741Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2034,
"topic": "gcn.circular",
"uuid": "1585cebe-f9dd-48a4-995d-ab08cb853d13",
"title": "GRB 230812B: Swift-XRT afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/13 09:01:52 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34400",
"subject": "GRB 230812B: Swift-XRT afterglow detection"
},
"message_text": "A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato\n(INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), A. Tohuvavohu\n(U. Toronto), D.N. Burrows (PSU), J.P. Osborne (U. Leicester) and P.A.\nEvans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/GBM-detected burst GRB 230812B in a series of observations tiled\non the sky. The total exposure time is 8.3 ks, distributed over 27\ntiles; the maximum exposure at a single sky location was 4.6 ks. The\ndata were collected between T0+25.4 ks and T0+38.1 ks, and are entirely\nin Photon Counting (PC) mode.\n\nFour uncatalogued X-ray sources are detected, of which one (\"Source 7\")\nis above the RASS 3-sigma upper limit at this position, and is\ntherefore likely the GRB afterglow. Using 4926 s of PC mode data and 4\nUVOT images, we find an enhanced XRT position (using the XRT-UVOT\nalignment and matching UVOT field sources to the USNO-B1 catalogue):\nRA, Dec = 249.13196, +47.85892 which is equivalent to:\n\nRA (J2000): 16h 36m 31.67s\nDec(J2000): +47d 51' 32.1\"\n\nwith an uncertainty of 2.1 arcsec (radius, 90% confidence). This\nposition is 106.5 arcmin from the Fermi/GBM position, but only 6.7\narcmin from the Fermi/LAT position.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.8 (+/-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 1.82 (+/-0.15). The\nbest-fitting absorption column is 9.6 (+4.3, -3.9) x 10^20 cm^-2, in\nexcess of the Galactic value of 2.0 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 3.4 x 10^-11 (4.0 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 9.6 (+4.3, -3.9) x 10^20 cm^-2\nGalactic foreground: 2.0 x 10^20 cm^-2\nExcess significance: 3.2 sigma\nPhoton index:\t 1.82 (+/-0.15)\n\nIf the light curve continues to decay with a power-law decay index of\n1.8, the count rate at T+24 hours will be 0.038 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x\n10^-12 (1.5 x 10^-12) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021589.\nThe results of the full analysis of the tiled XRT observations are\navailable at https://www.swift.ac.uk/xrt_products/TILED_GRB00115.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTE3MzE0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.YQ3w03SOnbfvOj_TgZhvfs0BsFCxISV-_nnoRiCaIGE\n\n",
"published": "2023-08-13T09:01:58.858984Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T09:01:58.859001Z",
"modified": "2023-08-13T09:01:58.862650Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2014,
"topic": "gcn.circular",
"uuid": "988b94ee-413c-4352-961b-622ccd4be9b1",
"title": "GRB 230812B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/12 19:08:45 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34386",
"subject": "GRB 230812B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 18:58:12 UT on 12 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230812B (trigger 713559497.049606 / 230812790).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 250.1, Dec = 46.2 (J2000 degrees, equivalent to J2000 16h 40m, 46d 12'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 29.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230812790/quicklook/glg_skymap_all_bn230812790.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/bn230812790/quicklook/glg_healpix_all_bn230812790.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230812790/quicklook/glg_lc_medres34_bn230812790.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODY3MzMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nhYsma0WLpqBKXxeidJ1iQkVzVx94wwpjgzwJPVwlTc\n\n",
"published": "2023-08-12T19:08:56.838696Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T19:08:56.838714Z",
"modified": "2023-08-12T19:08:56.843190Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2015,
"topic": "gcn.circular",
"uuid": "e40a72ab-4c6d-4a0f-bd82-c97b3f3c7c3a",
"title": "GRB 230812B: Fermi GBM detection of an extremely bright GRB",
"submitter": "Hop gcn.circular",
"authors": "Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>",
"data": {
"date": "23/08/12 19:51:19 GMT",
"from": "Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34387",
"subject": "GRB 230812B: Fermi GBM detection of an extremely bright GRB"
},
"message_text": "S. Lesage (UAH), E. Burns (LSU), S. Dalessi (UAH), and O. Roberts (USRA)\nreport on behalf of the Fermi GBM Team:\n\n\"At 18:58:12 UT on 12 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230812B (trigger 713559497/230812790).\n\nThe GBM light curve consists of an extremely bright short pulse, with the bulk of the emission during the first 2 seconds, and continued emission out to roughly 20 seconds. This event, if it is a GRB, it is extremely bright and follow-up across all wavelengths is encouraged.\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 250.06, Dec = 46.20 (J2000 degrees, equivalent to J2000 16h 40m, +46d 12'), with a statistical uncertainty of 1.00 degree\n(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 systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).\n\nThe angle from the Fermi LAT boresight is 29 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230812790/quicklook/glg_skymap_all_bn230812790.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/bn230812790/quicklook/glg_healpix_all_bn230812790.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230812790/quicklook/glg_lc_medres34_bn230812790.gif\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODY5ODg1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SakzRbVMtCz3jocAD7Nn8awm0dopYLrKZL1GzHHNcqw\n\n",
"published": "2023-08-12T19:51:31.275130Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T19:51:31.275150Z",
"modified": "2023-08-12T19:51:31.279699Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2055,
"topic": "gcn.circular",
"uuid": "61defbfd-1ce9-4f95-abbe-9c2124d11a89",
"title": "LIGO/Virgo/KAGRA S230812aj: two counterpart neutrino candidates from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "acz2122@columbia.edu",
"data": {
"date": "23/08/14 00:29:28 GMT",
"from": "acz2122@columbia.edu",
"title": "GCN CIRCULAR",
"number": "34407",
"subject": "LIGO/Virgo/KAGRA S230812aj: two counterpart neutrino candidates from IceCube neutrino searches"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky\nlocalization of the low-significance gravitational wave candidate S230812aj in a time range of 1000 seconds\ncentered on the alert event time (2023-08-12 11:56:00 UTC to 2023-08-12 12:12:40 UTC)\nhas been performed [1,2]. During this time period IceCube was collecting good quality data.\nOne hypothesis test was conducted for this low-significance gravitational wave event. The\nsearch uses a Bayesian approach to quantify the joint GW + neutrino event significance, which\nassumes a binary merger scenario and accounts for known astrophysical priors, such as GW source\ndistance, in the significance estimate [3].\n\nTwo track-like events are found in spatial and temporal coincidence with the gravitational-wave\ncandidate S230812aj calculated from the map circulated by LVK as S230812aj-2-Preliminary. This\nrepresents an overall pre-trial p-value of 0.0049 for the Bayesian search.\n\nThe reported p-value here does not account for any trials correction (multiple hypotheses testing). The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates. Further details are available at https://gcn.nasa.gov/missions/icecube.\n\nProperties of the coincident event(s) are shown below.\n\ndt(s)\tRA(deg)\t\tDec(deg)\tAngular uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n141.95 296.38 \t38.28 \t1.987 \t\tnot applicable \t0.0054\n-86.59 304.78 \t8.59 \t1.716 \t\tnot applicable \t0.0846\n\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle\n \trepresenting 90% CL containment by area.\np-value = the p-value for this specific track event from each search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the\ngeographic South Pole, Antarctica. The IceCube realtime alert point of contact can be\nreached at roc@icecube.wisc.edu\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTcyOTc0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.CSk8iS02TV-LDw-dLXzqZ5ebQJE0YJq3RSkrD1IAzJE\n\n",
"published": "2023-08-14T00:29:42.218097Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T00:29:42.218127Z",
"modified": "2023-08-14T00:29:42.228290Z",
"nonlocalizedevents": [
{
"event_id": "S230812a"
}
],
"targets": []
},
{
"id": 2018,
"topic": "gcn.circular",
"uuid": "90010dee-8107-436b-ab44-d8aca331059b",
"title": "GRB 230812B: Tiled Swift observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/12 21:10:34 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34388",
"subject": "GRB 230812B: 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/GBM GRB 230812B. Automated analysis of the XRT data will\nbe presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00115\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/GBM 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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODc0NjQwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LN-fTL7_KqesxtGMoErW5wfsQ0ZNX41D9F81svUWCCQ\n\n",
"published": "2023-08-12T21:10:45.133851Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T21:10:45.133869Z",
"modified": "2023-08-12T21:10:45.137776Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2021,
"topic": "gcn.circular",
"uuid": "130f937b-db28-478c-8201-91922d03e887",
"title": "Fermi GRB 230812B: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/12 22:31:08 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34389",
"subject": "Fermi GRB 230812B: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 230812B ( Fermi GBM team, GCN 34386) errorbox 10680 sec after notice time and 10713 sec after trigger time at 2023-08-12 21:56:45 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 50 deg. The sun altitude is -31.0 deg.\n\nThe galactic latitude b = 41 deg., longitude l = 72 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"53499\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 10804 | 2023-08-12 21:56:45 | MASTER-Tavrida | (16h 41m 41.24s , +46d 23m 36.1s) | C | 180 | 19.3 |\n 10992 | 2023-08-12 21:59:54 | MASTER-Tavrida | (16h 41m 46.04s , +46d 22m 29.1s) | C | 180 | 19.1 |\n 11111 | 2023-08-12 22:03:07 | MASTER-Tavrida | (16h 41m 40.73s , +46d 21m 24.6s) | C | 30 | 17.8 |\n 11151 | 2023-08-12 22:03:47 | MASTER-Tavrida | (16h 41m 47.62s , +46d 21m 41.9s) | C | 30 | 17.8 |\n 11189 | 2023-08-12 22:04:25 | MASTER-Tavrida | (16h 41m 44.53s , +46d 23m 10.6s) | C | 30 | 17.9 |\n 11227 | 2023-08-12 22:05:04 | MASTER-Tavrida | (16h 41m 44.48s , +46d 21m 32.8s) | C | 30 | 17.8 |\n 11267 | 2023-08-12 22:05:43 | MASTER-Tavrida | (16h 41m 47.52s , +46d 22m 59.5s) | C | 30 | 17.8 |\n 11304 | 2023-08-12 22:06:21 | MASTER-Tavrida | (16h 41m 40.68s , +46d 22m 18.0s) | C | 30 | 17.8 |\n 11343 | 2023-08-12 22:06:59 | MASTER-Tavrida | (16h 41m 41.50s , +46d 23m 16.6s) | C | 30 | 18.0 |\n 11381 | 2023-08-12 22:07:38 | MASTER-Tavrida | (16h 41m 47.28s , +46d 22m 15.3s) | C | 30 | 17.8 |\n 11495 | 2023-08-12 22:08:17 | MASTER-Tavrida | (16h 39m 42.09s , +46d 39m 09.7s) | C | 180 | 19.0 |\n 11683 | 2023-08-12 22:11:25 | MASTER-Tavrida | (16h 39m 49.58s , +46d 39m 04.4s) | C | 180 | 19.0 |\n 11874 | 2023-08-12 22:14:36 | MASTER-Tavrida | (16h 41m 28.89s , +45d 40m 34.6s) | C | 180 | 19.0 |\n 12063 | 2023-08-12 22:17:44 | MASTER-Tavrida | (16h 41m 29.14s , +45d 39m 21.9s) | C | 180 | 19.0 |\n 12251 | 2023-08-12 22:20:53 | MASTER-Tavrida | (16h 41m 31.63s , +45d 40m 21.9s) | C | 180 | 19.0 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODc5NDczLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.HVQql4E5GDoa-bmCaSo-oO6UAMC_qgCKBmuzs1wfPUs\n\n",
"published": "2023-08-12T22:31:19.452281Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T22:31:19.452299Z",
"modified": "2023-08-12T22:31:19.455856Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2022,
"topic": "gcn.circular",
"uuid": "465918a2-1ac1-46d8-b3e9-e3c9885bb322",
"title": "LAT GRB230812.79: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/13 01:00:33 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34390",
"subject": "LAT GRB230812.79: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the LAT GRB230812.79 (trigger No 230812790,16h 35m 45.60s , +47d 56m 42.0s, R=0.172833) errorbox 10713 sec after trigger time at 2023-08-12 21:56:45 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 50 deg. The sun altitude is -31.0 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) was pointed to the LAT GRB230812.79 errorbox 15682 sec after trigger time at 2023-08-12 23:19:34 UT, with upper limit up to 18.2 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -16.0 deg.\n\nThe galactic latitude b = 42 deg., longitude l = 74 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"53603\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 10804 | 2023-08-12 21:56:45 | MASTER-Tavrida | (16h 41m 41.24s , +46d 23m 36.1s) | C | 180 | 19.3 |\n 10992 | 2023-08-12 21:59:54 | MASTER-Tavrida | (16h 41m 46.04s , +46d 22m 29.1s) | C | 180 | 19.1 |\n 11111 | 2023-08-12 22:03:07 | MASTER-Tavrida | (16h 41m 40.73s , +46d 21m 24.6s) | C | 30 | 17.8 |\n 11151 | 2023-08-12 22:03:47 | MASTER-Tavrida | (16h 41m 47.62s , +46d 21m 41.9s) | C | 30 | 17.8 |\n 11189 | 2023-08-12 22:04:25 | MASTER-Tavrida | (16h 41m 44.53s , +46d 23m 10.6s) | C | 30 | 17.9 |\n 11227 | 2023-08-12 22:05:04 | MASTER-Tavrida | (16h 41m 44.48s , +46d 21m 32.8s) | C | 30 | 17.8 |\n 11267 | 2023-08-12 22:05:43 | MASTER-Tavrida | (16h 41m 47.52s , +46d 22m 59.5s) | C | 30 | 17.8 |\n 11304 | 2023-08-12 22:06:21 | MASTER-Tavrida | (16h 41m 40.68s , +46d 22m 18.0s) | C | 30 | 17.8 |\n 11343 | 2023-08-12 22:06:59 | MASTER-Tavrida | (16h 41m 41.50s , +46d 23m 16.6s) | C | 30 | 18.0 |\n 11381 | 2023-08-12 22:07:38 | MASTER-Tavrida | (16h 41m 47.28s , +46d 22m 15.3s) | C | 30 | 17.8 |\n 11495 | 2023-08-12 22:08:17 | MASTER-Tavrida | (16h 39m 42.09s , +46d 39m 09.7s) | C | 180 | 19.0 |\n 11683 | 2023-08-12 22:11:25 | MASTER-Tavrida | (16h 39m 49.58s , +46d 39m 04.4s) | C | 180 | 19.0 |\n 12443 | 2023-08-12 22:24:04 | MASTER-Tavrida | (16h 42m 43.40s , +47d 09m 33.2s) | C | 180 | 19.2 |\n 12630 | 2023-08-12 22:27:11 | MASTER-Tavrida | (16h 42m 43.44s , +47d 10m 26.3s) | C | 180 | 19.0 |\n 12822 | 2023-08-12 22:30:24 | MASTER-Tavrida | (16h 37m 35.03s , +46d 09m 23.7s) | C | 180 | 18.7 |\n 13010 | 2023-08-12 22:33:32 | MASTER-Tavrida | (16h 37m 29.92s , +46d 08m 17.3s) | C | 180 | 18.6 |\n 13202 | 2023-08-12 22:36:44 | MASTER-Tavrida | (16h 29m 37.44s , +46d 08m 30.0s) | C | 180 | 18.7 |\n 13389 | 2023-08-12 22:39:51 | MASTER-Tavrida | (16h 29m 33.96s , +46d 09m 50.2s) | C | 180 | 18.7 |\n 13961 | 2023-08-12 22:49:23 | MASTER-Tavrida | (16h 29m 36.75s , +47d 38m 29.9s) | C | 180 | 18.7 |\n 14149 | 2023-08-12 22:52:30 | MASTER-Tavrida | (16h 29m 37.60s , +47d 39m 23.6s) | C | 180 | 18.6 |\n 15563 | 2023-08-12 23:16:04 | MASTER-Tavrida | (16h 41m 55.05s , +46d 19m 46.5s) | C | 180 | 18.3 |\n 15750 | 2023-08-12 23:19:12 | MASTER-Tavrida | (16h 41m 50.04s , +46d 18m 40.4s) | C | 180 | 18.3 |\n 15712 | 2023-08-12 23:19:34 | MASTER-OAFA | (16h 32m 37.39s , +46d 49m 30.8s) | C | 60 | 17.3 |\n 15823 | 2023-08-12 23:21:25 | MASTER-OAFA | (16h 44m 16.19s , +46d 50m 30.3s) | C | 60 | 17.4 |\n 16022 | 2023-08-12 23:24:44 | MASTER-Tavrida | (16h 45m 47.32s , +48d 24m 35.8s) | C | 60 | 18.3 |\n 16093 | 2023-08-12 23:25:54 | MASTER-Tavrida | (16h 45m 51.22s , +48d 25m 57.5s) | C | 60 | 18.3 |\n 16165 | 2023-08-12 23:27:06 | MASTER-Tavrida | (16h 37m 46.75s , +48d 25m 03.8s) | C | 60 | 18.1 |\n 16234 | 2023-08-12 23:28:15 | MASTER-Tavrida | (16h 37m 47.03s , +48d 26m 00.9s) | C | 60 | 18.1 |\n 16305 | 2023-08-12 23:29:26 | MASTER-Tavrida | (16h 37m 47.02s , +47d 07m 12.8s) | C | 60 | 17.7 |\n 16375 | 2023-08-12 23:30:36 | MASTER-Tavrida | (16h 37m 41.37s , +47d 06m 10.6s) | C | 60 | 17.7 |\n 16507 | 2023-08-12 23:31:48 | MASTER-Tavrida | (16h 41m 57.87s , +46d 18m 31.8s) | C | 180 | 18.3 |\n 16639 | 2023-08-12 23:35:00 | MASTER-Tavrida | (16h 33m 49.28s , +48d 07m 40.9s) | C | 60 | 17.9 |\n 16708 | 2023-08-12 23:36:10 | MASTER-Tavrida | (16h 33m 49.34s , +48d 05m 48.0s) | C | 60 | 17.9 |\n 16792 | 2023-08-12 23:37:34 | MASTER-OAFA | (16h 32m 29.87s , +46d 50m 00.3s) | C | 60 | 17.4 |\n 16903 | 2023-08-12 23:39:25 | MASTER-OAFA | (16h 44m 13.26s , +46d 50m 40.8s) | C | 60 | 17.5 |\n 17581 | 2023-08-12 23:50:43 | MASTER-Tavrida | (16h 41m 57.02s , +48d 54m 55.2s) | C | 60 | 17.9 |\n 17652 | 2023-08-12 23:51:54 | MASTER-Tavrida | (16h 41m 51.05s , +48d 54m 01.4s) | C | 60 | 17.8 |\n 18078 | 2023-08-12 23:58:59 | MASTER-OAFA | (16h 31m 15.33s , +49d 01m 01.6s) | C | 60 | 17.2 |\n 18292 | 2023-08-13 00:01:33 | MASTER-Tavrida | (16h 41m 50.91s , +48d 05m 48.1s) | C | 180 | 18.1 |\n 18411 | 2023-08-13 00:04:33 | MASTER-OAFA | (16h 32m 35.81s , +46d 50m 46.2s) | C | 60 | 17.5 |\n 18479 | 2023-08-13 00:04:41 | MASTER-Tavrida | (16h 41m 51.27s , +48d 06m 41.4s) | C | 180 | 18.2 |\n 18523 | 2023-08-13 00:06:24 | MASTER-OAFA | (16h 44m 10.88s , +46d 49m 31.0s) | C | 60 | 17.8 |\n 18671 | 2023-08-13 00:07:52 | MASTER-Tavrida | (16h 33m 50.96s , +46d 35m 56.8s) | C | 180 | 17.6 |\n 18694 | 2023-08-13 00:08:16 | MASTER-OAFA | (16h 39m 21.33s , +46d 14m 36.3s) | C | 180 | 18.2 |\n 18859 | 2023-08-13 00:11:00 | MASTER-Tavrida | (16h 33m 45.72s , +46d 34m 51.4s) | C | 180 | 17.7 |\n 19496 | 2023-08-13 00:22:38 | MASTER-Tavrida | (16h 25m 59.99s , +47d 36m 01.5s) | C | 60 | 17.6 |\n 19564 | 2023-08-13 00:23:45 | MASTER-Tavrida | (16h 25m 55.13s , +47d 35m 16.9s) | C | 60 | 17.6 |\n 20964 | 2023-08-13 00:46:06 | MASTER-OAFA | (16h 34m 57.91s , +47d 57m 55.1s) | C | 180 | 18.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODg4NDM5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3OVC_HGJ6Er114tmJS-a5haMb33EecR-REyxLS_dFs8\n\n",
"published": "2023-08-13T01:00:46.820159Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T01:00:46.820177Z",
"modified": "2023-08-13T01:00:46.824177Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2066,
"topic": "gcn.circular",
"uuid": "e0498431-40f9-440c-acc7-ec5c8a00ac7b",
"title": "LIGO/Virgo/KAGRA S230814r: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "U. Deka at International Centre for Theoretical Sciences <uddeepta.deka@ligo.org>",
"data": {
"date": "23/08/14 07:49:50 GMT",
"from": "U. Deka at International Centre for Theoretical Sciences <uddeepta.deka@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34411",
"subject": "LIGO/Virgo/KAGRA S230814r: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230814r during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-14 06:19:20.458 UTC (GPS\ntime: 1376029178.458). The candidate was found by the CWB [1], GstLAL\n[2], oLIB [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230814r is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.8e-08 Hz, or about one in 7\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230814r\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (93%), Terrestrial (7%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 26 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n3753 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 5634 +/- 2023 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Lynch et al. PRD 95, 104046 (2017)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTk5Mzk1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-E3E4rVcMY57Et9tJu5M3HMf_-miA07w6da6p8oiSCQ\n\n",
"published": "2023-08-14T07:50:04.211812Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T07:50:04.211832Z",
"modified": "2023-08-14T07:50:04.218279Z",
"nonlocalizedevents": [
{
"event_id": "S230814r"
}
],
"targets": []
},
{
"id": 2025,
"topic": "gcn.circular",
"uuid": "7071cbe0-b343-42c2-84c4-f0ef3d501dbc",
"title": "GRB 230812B: Fermi GBM Observation of a very bright burst",
"submitter": "Hop gcn.circular",
"authors": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
"data": {
"date": "23/08/13 01:41:45 GMT",
"from": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34391",
"subject": "GRB 230812B: Fermi GBM Observation of a very bright burst"
},
"message_text": "O.J. Roberts (USRA), C. Meegan (UAH), S. Lesage (UAH), E. Burns (LSU), and S. Dalessi (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 18:58:12.05 UT on 12 August 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230812B (trigger 713559497 / 230812790). The Fermi\nGBM Final Real-time Localization was previously reported (GBM team 2023, GCN 34386).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 29 degrees.\n\nThe GBM light curve consists of a FRED-like burst with a duration (T90)\nof about 3 s (10-1000 keV). The time-averaged spectrum over the whole burst\nfrom T0-1s to T0+32 s is best fit by a Band function with Epeak = 273 +/- 3 keV,\nalpha of -0.80 +/- 0.01 and beta of -2.47 +/-0.02.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.5201 +/- 0.0002)E-04 erg/cm^2. The 1s peak photon flux measured\nstarting from T0+0.6 s in the 10-1000 keV band is 740 +/- 2 ph/s/cm^2.\n\nDue to a timing glitch in the middle of the burst in the TTE data, this data\ntype had to be reprocessed and consequently, this preliminary report used the\nCSPEC and CTIME data types only, which were unaffected. We note that due\nto the intensity of the burst, pulse pile-up during the burst is highly likely.\nThis analysis is ongoing.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODkwOTEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.djzy50Au9jsoEKGrEvJok62Ke-uMe3tWSP-UtQuTAZY\n\n",
"published": "2023-08-13T01:41:56.071360Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T01:41:56.071377Z",
"modified": "2023-08-13T01:41:56.074975Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2026,
"topic": "gcn.circular",
"uuid": "f131d333-638e-40c2-85a4-63dc873f84dd",
"title": "GRB 230812B: Fermi-LAT detection",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "23/08/13 02:50:20 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"title": "GCN CIRCULAR",
"number": "34392",
"subject": "GRB 230812B: Fermi-LAT detection"
},
"message_text": "L. Scotton (UAH), D. Kocevski (NASA/MSFC), J. Racusin (NASA/GSFC), and N. Omodei (Stanford University)\nreport on behalf of the Fermi-LAT Collaboration:\n\nOn August 12, 2023, Fermi-LAT detected high-energy emission from\nGRB 230812B, which was also detected by Fermi-GBM (trigger 713559497/230812790, S. Lesage GCN 34387, O. Roberts GCN 34391).\n\nThe best LAT on-ground location is found to be\n\nRA, Dec = 249.10, 47.75 (degrees, J2000)\n\nwith an error radius of 0.13 deg (90% containment, statistical error only).\nThis was 29 deg from the LAT boresight at the time of the GBM trigger:\n\nT0 = 18:58:12.05 UT.\n\nThe data from the Fermi-LAT show a significant increase\nin the event rate after the GBM trigger that is spatially correlated with the\nGBM emission (1.69 degrees from the GBM location) with high significance.\nThe photon flux above 100 MeV in the time interval 0-50 s after the\nGBM trigger is (1.96 +/- 0.27)E-4 ph/cm2/s.\n\nThe estimated photon index above 100 MeV is -2.16 +/- 0.14.\n\nThe highest-energy photon is a 72 GeV event which is observed 32.2 seconds\nafter the GBM trigger.\n\nThe Fermi-LAT point of contact for this burst is\nLorenzo Scotton (lorenzo.scotton AT uah.edu).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover\nthe energy band from 20 MeV to greater than 300 GeV.\nIt is the product of an international collaboration between\nNASA and DOE in the U.S. and many scientific institutions\nacross France, Italy, Japan and Sweden.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODk1MDI1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.5BVbIiCZnsr6oOU8PisGJuDC24xHifOgkzSSyA7aUFk\n\n",
"published": "2023-08-13T02:50:30.697644Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T02:50:30.697682Z",
"modified": "2023-08-13T02:50:30.702181Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2552,
"topic": "gcn.circular",
"uuid": "26005c19-8b41-472e-b14c-9303713dbb12",
"title": "Subject: GRB230826A: Swift/UVOT upper limits",
"submitter": "Hop gcn.circular",
"authors": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"data": {
"date": "23/08/28 10:21:42 GMT",
"from": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34582",
"subject": "Subject: GRB230826A: Swift/UVOT upper limits"
},
"message_text": "A. A. Breeveld (UCL-MSSL) and R. A. J. Eyles-Ferris (U Leicester) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230826A 114 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 34565).\nNo optical afterglow consistent with the enhanced XRT position (Osborne et al., GCN Circ. 34569) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 114 263 147 >20.0\nwhite 606 5452 312 >20.4\nv 657 1105 58 >17.8\nb 582 5339 255 >19.6\nu 327 5134 481 >19.5\nuvw1 707 1320 71 >18.4\nuvm2 682 1303 78 >18.4\nuvw2 632 1254 78 >18.6\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.243 in the direction of the burst (Schlegel et al. 1998).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjE4MTA3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.l3zkRJLcfJz2aZRFbP8kMCHQm-Gw1siOnqpJebkw3BU\n\n",
"published": "2023-08-28T10:21:57.369489Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T10:21:57.369509Z",
"modified": "2023-08-28T10:21:57.375188Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2027,
"topic": "gcn.circular",
"uuid": "98f4ff5f-5d38-4fab-a39a-170a6440abf4",
"title": "GRB 230812B: Preliminary Swift/XRT localization",
"submitter": "Hop gcn.circular",
"authors": "Jamie Kennea at Penn State U <jak51@psu.edu>",
"data": {
"date": "23/08/13 04:03:06 GMT",
"from": "Jamie Kennea at Penn State U <jak51@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34393",
"subject": "GRB 230812B: Preliminary Swift/XRT localization"
},
"message_text": "J. A. Kennea (PSU) on behalf ot the Swift team,\n\nIn a target-of-opportunity observation taken starting 02:00UT on \nAugust 13th, 2023, pointed at the LAT position (GCN 34392) of \nGRB 230812B (GCN 34391), we find a previously uncatalogued X-ray\npoint source in preliminary data from Swiftâs X-ray Telescope.\n\nThe preliminary position is RA/Dec (J2000) = 249.13957, 47.854760,\nwhich is equivalent:\n\nRA(J2000) = 16h 36m, 33.4s,\nDec(J2000) = +47d 51m 17.1s,\n\nwith an estimate error of 10 arcseconds radius. Please note this position\nis based upon preliminary data, reported rapidly to aide follow-up. An\nupdated position will be reported via GCN ASAP.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODk5MzkyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.rK2rle_qvqux91qLC_BfwMnrrb3W0u96gV0jeQzk1Qo\n\n",
"published": "2023-08-13T04:03:23.858430Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T04:03:23.858447Z",
"modified": "2023-08-13T04:03:23.863508Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2028,
"topic": "gcn.circular",
"uuid": "5775ee06-191a-46a3-b69b-5851afdc4d56",
"title": "GRB 230812B: Improved Swift/XRT localization",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/13 05:19:38 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34394",
"subject": "GRB 230812B: Improved Swift/XRT localization"
},
"message_text": "K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:\n\nWe have analysed 1.8 ks of XRT data for GRB 230812B, starting 25.4 ks\nafter the Fermi trigger (GCN 34391, 34392). The data are entirely in\nPhoton Counting (PC) mode. The currently best available XRT position is\nRA, Dec = 249.1323, 47.8574, which is equivalent to:\n\nRA (J2000): 16 36 31.76\nDec(J2000): +47 51 26.7\n\nwith an uncertainty of 3.7 arcsec (radius, 90% confidence).\n\nWe note that this is 20 arcsec from the preliminary position given in GCN\n34393.\n\nA detailed refined analysis circular will be sent when more data are\navailable.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTAzOTgzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.puvyTNavfapA0eGZphFzKbCi0W3XwB33mEo8erZAZ6I\n\n",
"published": "2023-08-13T05:19:50.202816Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T05:19:50.202834Z",
"modified": "2023-08-13T05:19:50.206551Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2553,
"topic": "gcn.circular",
"uuid": "f70296e2-306a-43b5-905e-0d1bbbb8fb93",
"title": "GRB 230827A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/08/28 10:46:50 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34583",
"subject": "GRB 230827A: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 230827A (Fermi/GBM detection: GCN 34575, INTEGRAL/SPI-ACS detection at 2023-08-27 ~18:17:53 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-08-27 18:18:14 UTC. The T90 duration measured by GRBAlpha is 73 s and the overall significance during T90 reaches 30 sigma.\n\nThe light curve obtained by GRBAlpha is available here: \nhttps://grbalpha.konkoly.hu/static/share/GRB230827A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjE5NjE1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.1l-UIQcDvuyMzUm0PFEAVFl9nemLaq1QCg_l3vGOHyE\n\n",
"published": "2023-08-28T10:47:00.991758Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T10:47:00.991777Z",
"modified": "2023-08-28T10:47:00.998194Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2075,
"topic": "gcn.circular",
"uuid": "b9cc46ec-3b7e-49b0-a4f4-99226e45e2e0",
"title": "GRB 230812B: GIT optical follow-up",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/08/14 18:22:14 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34420",
"subject": "GRB 230812B: GIT optical follow-up"
},
"message_text": "R. Kumar (IITB), A. Salgundi (IITB), V. Swain (IITB), H. Kumar (IITB), V. Bhalerao (IITB), G.C. Anupama (IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:\n\nWe observed the field of the GRB230812B (Fermi GBM Team, GCN 34386) with 0.7m GROWTH-India Telescope (GIT). We started the observation from 14:46:44 UT on 2023-08-13, roughly 20 hours after the Fermi trigger. We obtained multiple frames of 300 sec each in the g' and r' bands. We detected the afterglow in our stacked images at the enhanced Swift XRT localization (Beardmore et al. GCN 34400). The details of the photometry are given in the below table:\n\n----------------------------------------------------------------------\n\nJD (mid) | t-t0 (days)| Filter | Exposure (s) | Magnitude (AB) |\n\n----------------------------------------------------------------------\n\n2460170.139773 | 0.85 | g' | 5 x 300 | 20.34 +/- 0.06 |\n2460170.121745 | 0.83 | r' | 4 x 300 | 19.98 +/- 0.05 |\n\n\n----------------------------------------------------------------------\n\nOur photometry values are consistent with the results submitted by other optical telescopes (Zheng & Filippenko, GCN 34395, Lipunov et al., GCN 34396, Salgundi et al., GCN 34397, Ackley et al., GCN 34398, Kuin et al. GCN 34399, Mao et al., GCN 34404, Odeh et al., GCN 34405, Moskvitin et al., GCN 34406, Leonini et al., GCN 34408, de Ugarte Postigo et al. GCN 34409 & 34410, Belkin et al., GCN 34412, and N. Ruocco et al., GCN 34413, N. Ruocco et al., GCN 34413, M. Shrestha et al., GCN 34416, C. Adami et al., GCN 34418, L. Moretti et al., GCN 34419).\nWe confirm that the candidate is decaying fast.\n\nThe GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDM3MzQwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.IrLisVRRu_z2Y2btQEBdeUDufKCxmWWtmzJ3zMprZNo\n\n",
"published": "2023-08-14T18:22:26.365362Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T18:22:26.365399Z",
"modified": "2023-08-14T18:22:26.371715Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2076,
"topic": "gcn.circular",
"uuid": "d6ae44f9-1831-42d7-ac8e-62a229a4fdd8",
"title": "GRB 230812B: Koshka Zeiss-1000 optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/14 18:43:43 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34421",
"subject": "GRB 230812B: Koshka Zeiss-1000 optical observations"
},
"message_text": "S. Belkin (IKI), I. Nikolenko (INASAN), N. Pankov (HSE, IKI), A. Pozanenko (IKI) report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 230812B (Fermi GBM Team, GCN 34386; Scotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al., GCN 34399; Casentini et al., GCN 34402) with Zeiss-1000 telescope of Koshka observatory in R-filter. We detected the afterglow (e.g. Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406; Leonini et al., GCN 34408; de Ugarte Postigo et al., GCNs 24409, 34410; Belkin et al., GCN 34412) in a stacked image. Preliminary photometry of the object is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma) Telescope\n (mid, days) (s)\n\n2023-08-13 18:07:14 0.99724 R 35*120 20.18 0.07 22.0 Zeiss-1000\n\nThe photometry is based on nearby SDSS stars used in (Moskvitin et al, GCN 34406):\nRA DEC R (Lupton transformations)\n16:36:35.9365104 +47:52:54.574320 14.893 0.008\n16:36:32.6835360 +47:53:44.537784 16.531 0.009\n16:36:25.6055880 +47:53:20.456304 16.827 0.009\n16:36:25.1691816 +47:52:20.931816 16.068 0.008\n16:36:44.6580984 +47:50:56.806944 15.785 0.008\n16:36:40.1374488 +47:54:02.128752 15.698 0.008\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDM4NjI4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.1oD5idTtWLnfoICL4LhhXDVtH5V_FUBk2ER0Tkjflc4\n\n",
"published": "2023-08-14T18:43:53.332910Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T18:43:53.332929Z",
"modified": "2023-08-14T18:43:53.338577Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2029,
"topic": "gcn.circular",
"uuid": "92bb39e7-7953-46d7-b724-b50b1b0c7c08",
"title": "GRB 230812B: KAIT Optical Afterglow Candidate",
"submitter": "Hop gcn.circular",
"authors": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"data": {
"date": "23/08/13 05:26:37 GMT",
"from": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"title": "GCN CIRCULAR",
"number": "34395",
"subject": "GRB 230812B: KAIT Optical Afterglow Candidate"
},
"message_text": "WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on\n\nbehalf of the KAIT GRB team:\n\n\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, responded to GRB 230812B (The Fermi GBM team,\n\nGCN 34386) starting at Aug. 13, 04:42:53 UT. We detected an uncataloged\n\noptical afterglow candidate not shown in SDSS archive at position\n\nof (error ~0.5\"):\n\n\nRA: 16:36:31.52 (J2000)\n\nDec: +47:51:32.24 (J2000)\n\n\nThis position is about 7.4 arcsec to the improved Swift/XRT\n\nlocalization (Page et al., GCN 34393), which is slightly outside its\n\nestimate 3.7 arcseconds error radius. We measure the target is\n\n~18.7 in out clear band image at ~9.75 hours after burst. We can\n\nnot estimate the variability at this time, further observations\n\nare encouraged.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTA0NDAzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JJDBsUkWZ7ohRPMn-2jZVO6Wo_JKmuiOmd6-SztnOwg\n\n",
"published": "2023-08-13T05:26:48.111805Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T05:26:48.111822Z",
"modified": "2023-08-13T05:26:48.115715Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2030,
"topic": "gcn.circular",
"uuid": "d395f2a8-0893-47a4-997f-e51ac4624984",
"title": "Fermi GRB 230812B: MASTER optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/13 05:28:50 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34396",
"subject": "Fermi GRB 230812B: MASTER optical counterpart"
},
"message_text": "\nV.Lipunov (Lomonosov MSU),\nD.Svinkin (Ioffe Institute),\nA.Kuznetsov, A.Sosnovskiy, N.Tiurina, E.Gorbovskoy, Ya.Kechin, P.Balanutsa, K.Zhirkov,\nO.Gress, A.Chasovnikov, G.Antipov, D.Vlasenko, V.Senik, V.Topolev, Yu.Tselik, Siyu Wu, D.Cheryasov, V.Shumkov, T.Pogrosheva (Lomonosov Moscow State University,SAI,Physics Department),\nC.Francile, F. Podesta, C.Lopez, R. Podesta (Observatorio Astronomico Felix Aguilar OAFA),\nD.Buckley (SAAO),\nR. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino\nAlvarez,J.Martinez,A.Corella,L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),\nN.M.Budnev, O.Gress (ISU,API),\nA.Gabovich, V.Yurkov (BSPU),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\n\nMASTER started Fermi GRB 230812B (Fermi GBM team GCN 34386, Ttrigger\u0018:58:12,\nLesage et al. GCN 34387, Evans et al. GCN 34388, Scotton et al. GCN 34387, Roberts et al. GCN 34391)\nat MASTER-SAAO (Lipunov et al GCN 34389, see covermap, near horizont; GCN 34390) by MASTER-II and MASTER very wide field cameras (Lipunov et al. 2010)\n\nFermi GBM error-box was covered by MASTER-SAAO, MASTER-Tavrida (since 2023-08-12 21:56:45 UT), MASTER-OAFA.\n\nThere is optical counterpart at\nR.A.,Dec.2000= 16 36 31.48 +47 51 35.14\nwith m\u0018.2 at several set of images.\n\nthat is in ~18\" of Swift-XRT preliminary counterpart (Swift GCN 34393)\n\nWe observed it till sunrise in MASTER-Tavrida , reduction will be continued.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTA0NTMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.WLSK-x_p5dMhKrYV99yDPKh9AgVxHELv3nuPF0MBd98\n\n",
"published": "2023-08-13T05:28:58.361519Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T05:28:58.361538Z",
"modified": "2023-08-13T05:28:58.365855Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2031,
"topic": "gcn.circular",
"uuid": "903df198-ef77-4fd3-b8c7-a4950046706f",
"title": "GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)",
"submitter": "Hop gcn.circular",
"authors": "Anirudh Salgundi <salgundi.anirudh@gmail.com>",
"data": {
"date": "23/08/13 08:02:28 GMT",
"from": "Anirudh Salgundi <salgundi.anirudh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34397",
"subject": "GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)"
},
"message_text": "Anirudh Salgundi (IITB), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Tomas Ahumada (CIT), Robert Stein (CIT), Igor Andreoni (UMD), Michael Coughlin (UMN), Shreya Anand (CIT), Viraj Karambelkar (CIT), Mansi Kasliwal (CIT), Avery Wold (IPAC), Theophile du Laz (CIT), Simeon Reusch (DESY), Igor Andreoni (UMD), Eric Bellm (UW), Varun Bhalerao (IITB), Brad Cenko (UMD), Brian Healy (UMN), David Kaplan (UWM), Jannis Necker (DESY), D. Perley (LJMU) report on behalf of the ZTF and GROWTH collaborations:\n\nWe observed the localization region of the GRB 230812B (trigger 713559497, GCN 34386) detected by the Gamma-Ray Burst Monitor (GBM) on the Fermi satellite with the 47 square-degree Zwicky Transient Facility (ZTF) camera (Graham et al., 2019; Bellm et al., 2019). We obtained images in the g-, and r- covering 420 square degrees beginning at 2023-08-13 03:34:57 (~8.5 hours after the burst trigger time). This corresponds to ~78% of the probability enclosed in the Earth-occultation corrected GRB localization map. Each exposure was 300 seconds with median depths of 21.9 mag in both g-band and r-band. The images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC (Masci et al. 2019).\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through Fritz (Coughlin et al. 2023). 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 GBM trigger. Close to 40 sources were time and spatially coincident with the burst, most of them showing g-r ~ 0 mag and a slow evolution.\n\n\nWe recover the candidate afterglow reported in Zheng et al. (GCN 34395) and Lipunov et al. (GCN 34396), and we highlight its rapid evolution: r-band decay rate ~2 mag/day. We note that this source is ~6\" from the source circulated in Page et al. (GCN 34394) detected by the Neil Gehrels Swift Observatory.\n\nWe additionally crossmatched the optical candidates to the Swift sources circulated and in Evans et al (GCN 34388, http://www.swift.ac.uk/xrt_products/TILED_GRB00115) and we find no other coincidences.\n\nThe details of the afterglow candidate in the table below:\n\nZTF name , AT name , UT first alert , t-t0 (days) , filter , mag (AB) , mag error (AB)\n-----------------------------------------------------------------\nZTF23aaxeacr , AT 2023pel , 2023-08-13 03:34:56 , 0.35 , r , 18.85 , 0.04\nZTF23aaxeacr , AT 2023pel , 2023-08-13 04:24:05 , 0.39 , g , 19.19 , 0.02\n\n\nWe encourage further follow-up.\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,\nGermany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.\nZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341.\nGROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.\nAlert distribution service provided by DIRAC@UW (Patterson et al. 2019).\nAlert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTEzNzUzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.cQCXVElUNfpiXP6mg79DhEqNJTSgR2nl_kpfjPjlIGw\n\n",
"published": "2023-08-13T08:02:39.842724Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T08:02:39.842743Z",
"modified": "2023-08-13T08:02:39.848891Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2032,
"topic": "gcn.circular",
"uuid": "3866f0b7-8a38-4d6e-897c-a6b985cc6223",
"title": "GOTO confirmation and possible host galaxy of GRB230812B optical afterglow",
"submitter": "Hop gcn.circular",
"authors": "ackleyastro@gmail.com",
"data": {
"date": "23/08/13 08:19:47 GMT",
"from": "ackleyastro@gmail.com",
"title": "GCN CIRCULAR",
"number": "34398",
"subject": "GOTO confirmation and possible host galaxy of GRB230812B optical afterglow"
},
"message_text": "K. Ackley; B. P. Gompertz; B. Godson; S. Belkin; D. O'Neill; A. Levan; T. Killestein; G. Ramsay; D. Malesani; R. Starling; M. J. Dyer; J. Lyman; K. Ulaczyk; F. Jiminez-Ibarra; A. Kumar; 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\nWe report on observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) in response to GRB 230812B (Page et al. GCN 34394, Scotton et al. GCN 34392, Lesage et al. GCN 34391). We covered the field of the X-ray (Swift, Page et al. GCN 34394) and optical (KAIT Zheng et al. GCN 34395, MASTER Lipunov et al. GCN 34396) candidate afterglow. The field was observed several times between 21:08:01 UT and 23:37:33 UT on 2023-08-12 (starting 2.16 hours after trigger). Each observation consisted of 4x90s exposures in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. We confirm the optical afterglow as reported by KAIT (Zheng et al. GCN 34395) with the first detection at 2.29 hours. Our observations show a clear decay as the source faded by approximately 0.76 magnitudes over 2.27 hours.\n\nObs Date | RA(J2000) | Dec(J2000) | Filter | Mag(AB)\n2023-08-12 21:15:40 | 249.13 | 47.86 | L | 17.45 +/- 0.02\n\nWe note the presence of an underlying extended source at the KAIT localisation in PS1 imaging and deep HyperSuprimeCam imaging, and suggest it to be the host galaxy of GRB 230812B.\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nObservations are ongoing.\n\nGOTO (https://goto-observatory.org) is a network of telescopes 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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTE0NzkzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3ftB3Nj0sBhR5lY0VeAHQUbaO9BMJIPcJ7UFNA6dpWg\n\n",
"published": "2023-08-13T08:19:58.481138Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T08:19:58.481155Z",
"modified": "2023-08-13T08:19:58.485074Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2033,
"topic": "gcn.circular",
"uuid": "4a04d607-9133-4703-bdfd-9d57abc4fcb7",
"title": "GRB 230812: Swift/UVOT Detection",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "23/08/13 09:01:24 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34399",
"subject": "GRB 230812: Swift/UVOT Detection"
},
"message_text": "Paul Kuin (MSSL/UCL) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230812\n25418 s after the GBM trigger (Roberts et al., GCN Circ. 34391).\nThe Fermi LAT also detected the trigger (Scotton et al, GCN Circ. 34392).\nAn candidate optical counterpart was reported (Zheng & Filippenko, GCN\nCirc.\n34395; Lipunov et al., GCN Circ 34396; Salgundi et al., GCN Circ. 34397)\nnear the reported XRT candidate (Kennea, GCN Circ. 34393, Page, GCN Circ.\n34394). A source consistent with the XRT position is detected in the UVOT\nexposures.\n\nPreliminary detections using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 25418 31151 390 20.48 +/- 0.18\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.024 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTE3MjkwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.WfvfMXguaDQa138lZPu8c5aEMwCfT7IibC01pGyLGs8\n\n",
"published": "2023-08-13T09:01:34.807408Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T09:01:34.807429Z",
"modified": "2023-08-13T09:01:34.811119Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4058,
"topic": "gcn.circular",
"uuid": "0219781f-f5ea-42ac-81e3-ad24b21d9dce",
"title": "GRB 231020A: BALROG localization (Fermi Trigger / GRB 231020790)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "23/10/20 21:23:35 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34861"
},
"title": "GCN CIRCULAR",
"number": "34861",
"subject": "GRB 231020A: BALROG localization (Fermi Trigger / GRB 231020790)"
},
"message_text": "T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:\n\nThe public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger\n at 18:56:58 on 20 Oct. 2023 were automatically fitted for spectrum\nand sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;\nBerlato et al. 2019, ApJ 873, 60).\n\nThe best-fit position (1 sigma statistical errors) is:\nRA(2000.0) = 316.0+/-0.4 deg\nDecl.(2000.0) = -31.3+/-0.3 deg\nWe estimate an additional systematic error of 2 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB231020790/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB231020790/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB231020790/json\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34861.",
"published": "2023-10-20T21:23:47.058652Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T21:23:47.058684Z",
"modified": "2023-10-20T21:23:47.066800Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2951,
"topic": "gcn.circular",
"uuid": "44d77897-0fb3-4d2b-bea1-0eb9c076e4af",
"title": "GRB 230911A: GOTO optical counterpart candidate",
"submitter": "Hop gcn.circular",
"authors": "Sergey Belkin at Monash University <sergey.belkin@monash.edu>",
"data": {
"date": "23/09/13 10:07:56 GMT",
"from": "Sergey Belkin at Monash University <sergey.belkin@monash.edu>",
"title": "GCN CIRCULAR",
"number": "34681",
"subject": "GRB 230911A: GOTO optical counterpart candidate"
},
"message_text": "S. Belkin; B. P. Gompertz; A. Kumar; K. Ackley; K. Wiersema; D. OâNeill; T. Killestein; R. Starling; M. J. Dyer; J. Lyman; K. Ulaczyk; F. Jimenez-Ibarra; D. Steeghs; D. K. Galloway; V. Dhillon; P. O'Brien; G. Ramsay; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nWe report on observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) in response to GRB 230911A (Fermi GBM team, GCN 34652). Observations were performed by GOTO North and South between 04:19:47 UT on 2023-09-11 and 17:08:39 UT on 2023-09-12 (1.17 to 37.98 hours after trigger). Each observation consisted of 4x90s exposures in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using recent survey observations of the same pointings. Source candidates were initially filtered using a classifier (Killestein et al. 2021) and cross-matched against a variety of contextual and minor planet catalogues. Human vetting was carried out in real time on any candidates that passed the above checks.\n\nWe identify one candidate optical counterpart consistent within the GBM 90% localisation region. We find no evidence of this source prior to the GRB trigger time in previous GOTO observations, the ZTF observations provided by the Lasair broker (Smith et al. 2019), or the ATLAS forced photometry server (Shingles et al. 2021). However, we caution that the last available observation of the field was taken by ATLAS nine days before the GRB trigger.\n\nName | RA(J2000) | Dec(J2000) | Filter | Mag(AB) | t - trig(hrs)\n\nGOTO23akf | 03:50:00.51 | -29:49:30.66 | L | 19.22 +/- 0.10 | 1.17 \n\nThis source is seen to decay as a power-law with an index of 0.61 +/- 0.07 across 7 epochs of observations. No object is present at this position in the Legacy Survey (Dey et al. 2019).\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/34681.\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjk0NTk5NjgyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.smFwR8EMOEOuAm3OTPEDHHr0ai7BRP-4M6G5AqVeoW4\n\n",
"published": "2023-09-13T10:08:15.526456Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-13T10:08:15.526478Z",
"modified": "2023-09-13T10:08:15.532965Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2036,
"topic": "gcn.circular",
"uuid": "0bac964a-32ce-4c15-9ef0-869f4cdee781",
"title": "GRB 230812B: GECAM-C observation of a very bright burst",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/08/13 09:31:23 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"title": "GCN CIRCULAR",
"number": "34401",
"subject": "GRB 230812B: GECAM-C observation of a very bright burst"
},
"message_text": "Shaolin Xiong, Jiacong Liu, Yue Huang report on behalf of the GECAM team:\n\nGECAM-C was triggered in-flight by a very bright burst, GRB 230812B, at 2023-08-12T18:58:12.100 UTC (T0), which was also observed by Fermi/GBM (Fermi GBM Team, GCN 34386), Fermi/LAT (Scotton et al, GCN 34392), etc. Both the GECAM-C in flight location and on-ground location are generally consistent with the Fermi/GBM within error.\n\nAccording to the realtime alert data, the GECAM-C light curve shows a FRED shape with a duration (T90) of ~4 sec (6-1000 keV). The time-averaged spectrum shows that it could be adequately fit by a Band function with a fluence about 2E-4 erg/cm2 in 20-1000 keV. We note that this analysis is based on realtime alert data and thus very preliminary. Refined analysis will be reported later.\n\nGravitational wave high-energy Electromagnetic Counterpart All sky Monitor (GECAM) mission originally consists of two microsatellites (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\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTE5MDg4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.zZh-va80GwAYjT-KQhXvvG331h9jLWUJZu9zcmEmB24\n\n",
"published": "2023-08-13T09:31:34.129353Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T09:31:34.129370Z",
"modified": "2023-08-13T09:31:34.133105Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6292,
"topic": "gcn.circular",
"uuid": "9365bb4d-4189-4a92-a9d3-77e0f5164af4",
"title": "GRB 240328B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/03/28 19:19:46 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35987"
},
"title": "GCN CIRCULAR",
"number": "35987",
"subject": "GRB 240328B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 19:09:10 UT on 28 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240328B (trigger 733345755.665982 / 240328798).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 223.4, Dec = -20.1 (J2000 degrees, equivalent to J2000 14h 53m, -20d 06'), with a statistical uncertainty of 11.6 degrees.\n\nThe angle from the Fermi LAT boresight is 78.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240328798/quicklook/glg_skymap_all_bn240328798.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/bn240328798/quicklook/glg_healpix_all_bn240328798.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240328798/quicklook/glg_lc_medres34_bn240328798.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35987.",
"published": "2024-03-28T19:20:04.661254Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-28T19:20:04.661272Z",
"modified": "2024-03-28T19:20:04.668116Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2042,
"topic": "gcn.circular",
"uuid": "f3743047-d4b4-4ffa-853a-c6f6a5fb426f",
"title": "GRB230812B: AGILE/MCAL detection",
"submitter": "Hop gcn.circular",
"authors": "Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>",
"data": {
"date": "23/08/13 11:45:31 GMT",
"from": "Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>",
"title": "GCN CIRCULAR",
"number": "34402",
"subject": "GRB230812B: AGILE/MCAL detection"
},
"message_text": "C. Casentini (INAF/IAPS), F. Longo (Univ. Trieste and INFN Trieste), C. Pittori,\nF. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),\nA. Ursi (ASI and INAF/IAPS), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano,\nG. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, A. Ciabattoni, A. Di Piano,\nV. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli\n(SSDC, and INAF/OAR), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia,\nA. Trois (INAF/OA-Cagliari), I. Donnarumma, E. Menegoni (ASI), A. Giuliani (INAF/IASF-Mi),\nP. W. Cattaneo (INFN Pavia), F. Cutrona (Univ. Milano Bicocca) and P. Tempesta\n(TeleSpazio) report on behalf of the AGILE Team:\n\nThe AGILE satellite detected the GRB 230812B at T0 = 2023-08-12 18:58:12 s (UTC),\nreported by Fermi (GCNs #34386, #34387, #34391, #34392), Swift (GCNs #34388, #34393,\n#34394, #34395, #34399, #34400) and MASTER (GCNs #34389, #34396).\n\nThe event lasted about 8 s and it released a total number of 17046 counts in the MCAL\ndetector (above a background rate of 590 Hz) and 97310 counts in the AC-Top detector\n(above a background rate of 3188 Hz). The AGILE ratemeters light curves can be found\nat http://www.agilescienceapp.it/notices/GRB230812B_AGILE_RM_ND.png .\n\nThe event also triggered a high time resolution MCAL data acquisition,\nfrom T0 s to T0+2 s (UTC), and released 12643 counts in the detector, above\na background rate of 561 Hz. The MCAL light curve can be found\nat http://www.agilescienceapp.it/notices/GRB230812B_084865_618951492.000000.png .\n\nAt the T0, the event was 55 deg off-axis.\n\nAdditional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices\ncan be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTI3MTM3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Qj3ebcRWA2flA6Eav0QWPrmp9C_OXo08NFnSIYTGrUQ\n\n",
"published": "2023-08-13T11:45:42.822371Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T11:45:42.822387Z",
"modified": "2023-08-13T11:45:42.826166Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2556,
"topic": "gcn.circular",
"uuid": "b663b39a-3471-4d67-8fad-766b13ef2ca3",
"title": "GRB 230827B / GRB 230827256: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "rachel.hamburg@ijclab.in2p3.fr",
"data": {
"date": "23/08/28 13:52:48 GMT",
"from": "rachel.hamburg@ijclab.in2p3.fr",
"title": "GCN CIRCULAR",
"number": "34584",
"subject": "GRB 230827B / GRB 230827256: Fermi GBM Observation"
},
"message_text": "R. Hamburg (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 06:08:30.73 UT on 27 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230827B (trigger 714809315/230827256).\nThe optical afterglow of GRB 230827B was also detected by ZTF (GCN 34574),\nGIT (GCN 34576), and AKO (GCN 34579). The location of the afterglow is\nconsistent with the GBM on-ground calculated location, which is\nRA = 299.32, Dec = +56.47 (J2000 degrees, equivalent to\nJ2000 19h 57m 17s, +56d 28' 12\"), with a statistical\nuncertainty of 2.17 degrees.\n\nThe angle from the Fermi LAT boresight is 140 degrees.\n\nThe GBM light curve shows a multi-peaked lightcurve with a duration (T90)\nof about 11 s (50-300 keV). The time-averaged spectrum\nfrom T0+0.002 to T0+10.240 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.37 +/- 0.05 and the cutoff energy,\nparameterized as Epeak, is 352 +/- 52 keV.\nA Band function fits the spectrum equally well\nwith Epeak= 256 +/- 51 keV, alpha = -1.28 +/- 0.08 and beta = -2.2 +/- 0.2.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.08 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.7 s in the 10-1000 keV band is 16.4 +/- 0.9 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjMwNzczLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4t8rxbipWlLU5S8kUeDpKi5Il8WzV88xMBHyBRxoLu0\n\n",
"published": "2023-08-28T13:52:58.835235Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T13:52:58.835253Z",
"modified": "2023-08-28T13:52:58.839043Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2043,
"topic": "gcn.circular",
"uuid": "73776919-0e65-4cda-be69-6680a20fc66f",
"title": "Konus-Wind detection of GRB 230812B",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/08/13 12:39:29 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "34403",
"subject": "Konus-Wind detection of GRB 230812B"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long very bright GRB 230812B (Fermi GBM detection:\nLessage et al., GCN 34387; Roberts et al., GCN 34391;\nFermi LAT detection: Scotton et al., GCN 34392;\nGECAM-C observation: Xiong et al., GCN 34401;\nAGILE/MCAL detection: Casentini et al., GCN 34402)\ntriggered Konus-Wind (KW) at T0=68292.611 s UT (18:58:12.611).\n\nThe burst light curve shows a single smooth emission pulse,\nwhich starts at ~T0-0.1 s, peaks at ~T0+0.7 s,\nand has a total duration of ~20 s.\nThe emission is seen up to ~5 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230812_T68292/\n\nAs observed by Konus-Wind, the burst had\na fluence of (3.27 ± 0.07)x10^-4 erg/cm^2 and\na 64-ms peak energy flux, measured from T0 + 0.704 s,\nof (2.63 ± 0.11)x10^-4 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0 to T0+19.712 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.85 (-0.03,+0.03),\nthe high energy photon index beta = -2.38 (-0.05,+0.04),\nthe peak energy Ep = 288 (-12,+12) keV,\nchi2 = 169/97 dof.\n\nThe spectrum near the peak count rate (measured from T0+0.512 to T0+0.768 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.17 (-0.08,+0.09),\nthe high energy photon index beta = -2.65 (-0.14,+0.11),\nthe peak energy Ep = 444 (-30,+31) keV,\nchi2 = 68/56 dof.\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTMwMzc1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.vdWwgXq69kExtLRaQ3JMCIU1kBEb2FCyMwqochFfh84\n\n",
"published": "2023-08-13T12:39:41.353721Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T12:39:41.353739Z",
"modified": "2023-08-13T12:39:41.357638Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2046,
"topic": "gcn.circular",
"uuid": "7dcce24b-a55a-40aa-922e-bc3c7c8523e3",
"title": "GRB 230812B: GMG - GRANDMA observations",
"submitter": "Hop gcn.circular",
"authors": "Jirong Mao at Yunnan Obs <jirongmao@mail.ynao.ac.cn>",
"data": {
"date": "23/08/13 14:40:05 GMT",
"from": "Jirong Mao at Yunnan Obs <jirongmao@mail.ynao.ac.cn>",
"title": "GCN CIRCULAR",
"number": "34404",
"subject": "GRB 230812B: GMG - GRANDMA observations"
},
"message_text": "J. Mao, K.-X. Lu, J.-M. Bai (YNAO), S. Karpov (FZU), M. C. Coughlin (UMN), A. Ugarte Postigo, S. Antier (OCA), O. Pyhsna (Univ. KieV), Z. Vidadi (Shao) on behalf of the Yunnan observatories team and the GRANDMA team:\n\nWe observed the field of GRB 230812B (Lesage et al. GCN 34387; Scotton et al. GCN 34392; Page GCN 34394; Zheng & Filippenko GCN 34395; Lipunov et al. GCN 34396; Salgundi et al. GCN 34397; Ackley et al. GCN 34398; Xiong et al. GCN 34401; Casentini et al. 34002; Frederiks et al. 34404) by the GMG telescope in Yunnan observatories. The observation began from UT 13:34:22 August 13, 2023, about 18.5 hours from the trigger. We clearly observed the optical afterglow of R~19.9+/-0.1. The further observation is ongoing.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTM3NjEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.32Urm3_n48pZhOGHS9-Ge31bO86DxZiEqXaoFMICebg\n\n",
"published": "2023-08-13T14:40:15.786984Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T14:40:15.787001Z",
"modified": "2023-08-13T14:40:15.791515Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2051,
"topic": "gcn.circular",
"uuid": "8f58edfd-f364-43a6-8871-d16021ba0be0",
"title": "GRB 230812B: Detected Optical Afterglow Candidate",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/08/13 17:32:55 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34405",
"subject": "GRB 230812B: Detected Optical Afterglow Candidate"
},
"message_text": "Mohammad Odeh, Osama Ghannam, Anas Mohammad, Khalfan Al-Noaimy, and Sameh\nAl-Ashi, report on behalf of Al-Khatim Observatory (AKO) operated by the\nInternational Astronomical Center in Abu Dhabi, UAE:\n\n\n\nWe observed the field of GRB 230812B (Lesage et al., GCN 34387; Scotton et\nal., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et\nal., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong\net al., GCN 34401; Casentini et al., GCN 34002; Frederiks et al., GCN\n34403; Mao et al., GCN 34404), with our 0.36m f/7.7 robotic telescope. The\nobservation was done on 13 August 2023 from 16:15 to 16:47 (UT), about 21.6\nhours from the trigger.\n\n\n\nWe obtained multiple 180-sec exposures in Ic filter. We detected an optical\nafterglow candidate at:\n\nR.A. (J2000): 16:36:31.45\n\nDec. (J2000): +47:51:32.3\n\n\n\nThat is the same localization of (Zheng & Filippenko, GCN 34395), which is\nabout 5.5 arcsec from the improved Swift/XRT localization (Page, GCN 34394).\n\n\n\nThe following observation was calculated using Atlas catalogue as a\nreference:\n\n-----------------------------------------------------------------------------\n\nObsTime (mid), Exposure (sec), Filter, Mag\n\n-----------------------------------------------------------------------------\n\n2023-08-13T16:32:40Z, 10 x 180s (stacked), Ic, 18.8 +/- 0.21\n\n-----------------------------------------------------------------------------\n\n\n\nThe magnitude is not corrected for galactic extinction.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTQ3OTgxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.vqj1Va68y8BpDMV_-r-gELy2FUStRdBSdvmcKFnaQ9I\n\n",
"published": "2023-08-13T17:33:11.424912Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T17:33:11.424931Z",
"modified": "2023-08-13T17:33:11.429679Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6293,
"topic": "gcn.circular",
"uuid": "996c170c-3738-4e48-bac4-231e9151d824",
"title": "GRB 240328C: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/03/28 20:59:17 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35988"
},
"title": "GCN CIRCULAR",
"number": "35988",
"subject": "GRB 240328C: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:\n \nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240328C.\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-03-28 00:37:54.024 with a duration of 4.1 s and a total significance of about 16.9 sigma. The light curve comprises a single peak.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a poorly constrained power-law index and a cutoff energy (\"Epeak\") of 213 keV. The modeled 10-10000 keV fluence is 5.3e-07 erg/cm^2.\n\nThe best-fit localization is RA, Decl. (J2000, deg) = 165.0, 30.6 with a radius of 27.8 deg (95% confidence), with a highly uncertain systematic uncertainty.\n\nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35988.",
"published": "2024-03-28T20:59:32.349950Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-28T20:59:32.349968Z",
"modified": "2024-03-28T20:59:32.357217Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2054,
"topic": "gcn.circular",
"uuid": "b94938a6-6d90-49ff-86f3-ad4f5fda67fb",
"title": "GRB 230812B: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/13 22:20:02 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34406",
"subject": "GRB 230812B: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS), report on behalf of\nthe GRB follow-up team.\n\nWe observed the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN\n34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley\net al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN\n34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et\nal., GCN 34405) with the 1-m telescope of SAO RAS Zeiss-1000 equipped\nwith the CCD photometer. We obtained 3 x 300 sec. images in Rc band on\nAugust 13, 20:14:15--20:31:46 UT under mediocre weather conditions.\n\nThe OT is clearly detected in our stacked frame with the brightness of\nR = 20.45 +/- 0.07 (t_mid - t0 = 1.0589 days).\n\nThis preliminary photometry is based on the nearby SDSS stars;\nmagnitudes are converted using Lupton (2005) equations.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTY1MjA4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.CVRpciaopAq6yYVOoMStYgHejOGOkfsY79O2Yskglj4\n\n",
"published": "2023-08-13T22:20:16.998552Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-13T22:20:16.998584Z",
"modified": "2023-08-13T22:20:17.005092Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2561,
"topic": "gcn.circular",
"uuid": "bd375f36-ad5f-4832-a12b-ef854e31550f",
"title": "GRB 230827B: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/08/28 17:13:25 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34585",
"subject": "GRB 230827B: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 230827B (Fermi/GBM detection: GCN 34584; GECAM-B detection: trigger no. 215; CALET/CGBM detection: trigger no. 1377151581; INTEGRAL/SPI-ACS detection at 2023-08-27 ~06:08:31 UT) was detected by the GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-08-27 06:08:33 UTC. The T90 duration is 21 s (17 s) and the significance during T90 reaches 10.2 sigma (7.3 sigma) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230827B_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjQyODEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.XsoKIWlHyLeLfs_VMB8BakU2LrNKdXUiGLapc3G4VeU\n\n",
"published": "2023-08-28T17:13:41.259731Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T17:13:41.259751Z",
"modified": "2023-08-28T17:13:41.263769Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2562,
"topic": "gcn.circular",
"uuid": "48a5282d-daef-49f6-8306-ec5a511204b3",
"title": "GRB 230826A: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/08/28 17:41:47 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34586",
"subject": "GRB 230826A: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 230826A (Fermi/GBM detection: GCN 34564; Swift/BAT detection: GCN 34565; GRBAlpha detection: GCN 34572) was detected by the GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-08-26 19:32:48 UTC. The T90 duration is 17 s (18 s) and the significance during T90 reaches 11 sigma (17 sigma) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230826A_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjQ0NTEyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.kHD_Jo-MI-XNQfE9vcIYjBV8VpGFCmlDTr3rp_qOAOc\n\n",
"published": "2023-08-28T17:41:58.339893Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T17:41:58.339912Z",
"modified": "2023-08-28T17:41:58.344142Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4059,
"topic": "gcn.circular",
"uuid": "70ad01b9-6ef2-4347-aad4-be57bd15b937",
"title": "GRB 231020B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/10/20 21:46:18 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34862"
},
"title": "GCN CIRCULAR",
"number": "34862",
"subject": "GRB 231020B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 21:35:52 UT on 20 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231020B (trigger 719530557.906538 / 231020900).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 221.4, Dec = 15.6 (J2000 degrees, equivalent to J2000 14h 45m, 15d 35'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 98.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020900/quicklook/glg_skymap_all_bn231020900.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/bn231020900/quicklook/glg_healpix_all_bn231020900.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020900/quicklook/glg_lc_medres34_bn231020900.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34862.",
"published": "2023-10-20T21:46:28.840500Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-20T21:46:28.840529Z",
"modified": "2023-10-20T21:46:28.850282Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2056,
"topic": "gcn.circular",
"uuid": "2ea0e756-903d-416b-90a7-60dc11fe2098",
"title": "GRB 230812B: Montarrenti Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini@iol.it>",
"data": {
"date": "23/08/14 00:58:33 GMT",
"from": "Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini@iol.it>",
"title": "GCN CIRCULAR",
"number": "34408",
"subject": "GRB 230812B: Montarrenti Observatory optical observations"
},
"message_text": "S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy) report:\n\nWe observed the field of GRB 230812B (Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN 34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406) with the automatic 0.53m Ritchey-Chretien telescope at Montarrenti Observatory (Siena, Italy, IAU code C88).\n\nThe observations were started under good weather conditions at 2023-08-13 19:20:53 UT (approximately 24 hours after burst) stacking 50x30s R and I-band CCD images.\n\nThe OT was clearly detected at the following position:\n\nRA (J2000.0) 16h 36m 31.47s +/-0.11 \nDecl. (J2000.0) +47° 51' 32.7\" +/-0.14\n\nPreliminary photometry is obtained using nearby PanSTARRS stars as follows: \n\nMJD Filter Mag. Err.\n60170.32784 R 20.48 +/-0.07\n60170.32827 I 19.78 +/-0.10\n\nMagnitudes are converted using Lupton (2005) equations and are not corrected for galactic dust extinction.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTc0NzE5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ooO6Q3a3WH5y4Bxp1igpuQ-pVySApNQj_rBXYGvdPOU\n\n",
"published": "2023-08-14T00:58:44.805377Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T00:58:44.805395Z",
"modified": "2023-08-14T00:58:44.812147Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2057,
"topic": "gcn.circular",
"uuid": "0e6060bd-7c99-4e47-bddb-d9e00e6bcd06",
"title": "GRB 230812B: Redshift from OSIRIS+/GTC",
"submitter": "Hop gcn.circular",
"authors": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"data": {
"date": "23/08/14 01:49:35 GMT",
"from": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"title": "GCN CIRCULAR",
"number": "34409",
"subject": "GRB 230812B: Redshift from OSIRIS+/GTC"
},
"message_text": "A. de Ugarte Postigo (OCA-CNRS), J.F. Agui Fernandez (IAA-CSIC), C. C Thoene (ASU-CAS) and L. Izzo (INAF-OACN and DARK/NBI) report:\n\nWe have observed the afterglow of GRB 230812B (Roberts et al. GCN34391, Scotton et al. GCN 34392, Zheng & Filippenko GCN 34395, Beardmore et al. GCN 34400) with OSIRIS+ mounted on the 10.4m GTC telescope at Roque de los Muchachos Observatory in La Palma (Spain). The observation consisted of spectroscopy with an exposure time of 3x900s and grism R1000B, with a wavelength coverage between 3600 and 7800 AA. The first spectrum started at 21:37 UT, 1.110 days after the burst.\n\nIn a preliminary reduction using old calibrations, the spectrum shows a strong trace with both emission and absorption lines which we identify as MgII, MgI, CaII, CaI in absorption, and [OII] and [OIII] in emission, at a common redshift of 0.360, which we interpret as the redshift of the GRB.\n\nAt this redshift, and assuming a fluence of 3.27e-4 erg/cm^2 as reported by Fermi/GBM (Roberts et al. GCN34391), the burst would have an Eiso = 8.3e52 erg. Together with a Ep = 273 keV (Roberts et al. GCN34391), GRB 230812B is consistent with the Amati relation for long GRBs.\n\nWe acknowledge excellent support from the GTC staff.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTc3NzgwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-dX3nDR6f4S6oZUNen7cFSy0zVvgtruLRy50W4t_Nj0\n\n",
"published": "2023-08-14T01:49:46.537152Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T01:49:46.537170Z",
"modified": "2023-08-14T01:49:46.543963Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2563,
"topic": "gcn.circular",
"uuid": "d3b4b689-baf9-49eb-bffb-96b0b3e64a2a",
"title": "GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at University of Alabama <delauj2@gmail.com>",
"data": {
"date": "23/08/28 19:25:30 GMT",
"from": "Jimmy DeLaunay at University of Alabama <delauj2@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34587",
"subject": "GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV"
},
"message_text": "James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 230827A onboard (T0: 2023-08-27T18:17:52.93 UTC, Fermi trig 714853077)\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 90 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), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 54.6 in a 8.192 s analysis time bin, starting at T0 + 18.432 s.\n\nNITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -61 and are consistent with Fermi GBM's localization (GCN 34575).\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjUwNzM2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.dmrDD2OuuXjuPveEjz8l5gcUwobSd3HslS_IBBIFASE\n\n",
"published": "2023-08-28T19:25:41.650362Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T19:25:41.650394Z",
"modified": "2023-08-28T19:25:41.656390Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2564,
"topic": "gcn.circular",
"uuid": "c4841848-22f2-474e-8037-f759c9d40e4d",
"title": "GRB 230827A: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/08/28 20:31:23 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34588",
"subject": "GRB 230827A: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 230827A (Fermi/GBM detection: GCN 34575; GRBAlpha detection: GCN 34583; Swift/BAT-GUANO detection: GCN 34587; INTEGRAL/SPI-ACS detection at 2023-08-27 ~18:17:53 UT) was detected by the GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-08-27 18:18:09 (18:18:18) UTC. The T90 duration is 82 s (77 s) and the significance during T90 reaches 10 sigma (24 sigma) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230827A_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjU0Njg4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.2hCuiq9NvEkaZhsJYsc6Sv1Y6woto6ykBDIThrt5XeE\n\n",
"published": "2023-08-28T20:31:34.141032Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-28T20:31:34.141055Z",
"modified": "2023-08-28T20:31:34.147387Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6294,
"topic": "gcn.circular",
"uuid": "c925a216-c9bd-4f47-a145-b036249e5aad",
"title": "IceCube-240327B: No candidates from the Zwicky Transient Facility",
"submitter": "Hop gcn.circular",
"authors": "Robert Stein at Caltech <rdstein@astro.caltech.edu>",
"data": {
"date": "24/03/29 03:10:13 GMT",
"from": "Robert Stein at Caltech <rdstein@astro.caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35989"
},
"title": "GCN CIRCULAR",
"number": "35989",
"subject": "IceCube-240327B: No candidates from the Zwicky Transient Facility"
},
"message_text": "Robert Stein (Caltech), Sven Weimann (Ruhr University Bochum), Jannis Necker (DESY), Simeon Reusch (DESY), Anna Franckowiak (DESY/Ruhr University Bochum) report:\n\nOn behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations:\n\nAs part of the ZTF neutrino follow up program (Stein et al. 2023), we observed the localization region of the neutrino event IceCube-240327B (Sommani et. al, GCN 35984) 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 2024-03-28 03:32 UTC, approximately 11.3 hours after event time. We covered 88.6% (5.7 sq deg) of the reported localization region. This estimate accounts for chip gaps. Each exposure was 300s with a typical depth of 21.0 mag.\n\nThe images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019, Stein et al. 2021) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019) . We are left with the following high-significance transient candidates by our pipeline, all lying within the 90.0% localization of the skymap.\n\nNo candidate counterparts were detected.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France.\n\nGROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.\nAlert distribution service provided by DIRAC@UW (Patterson et al. 2019).\nAlert database searches are done by AMPEL (Nordin et al. 2019).\nAlert filtering is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35989.",
"published": "2024-03-29T03:10:32.309133Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-29T03:10:32.309158Z",
"modified": "2024-03-29T03:10:32.317072Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2058,
"topic": "gcn.circular",
"uuid": "cff8103f-26cd-467e-a81a-059fc03f5a1d",
"title": "GRB 230812B: Spectroscopy from NOT",
"submitter": "Hop gcn.circular",
"authors": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"data": {
"date": "23/08/14 01:51:16 GMT",
"from": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"title": "GCN CIRCULAR",
"number": "34410",
"subject": "GRB 230812B: Spectroscopy from NOT"
},
"message_text": "A. de Ugarte Postigo (OCA-CNRS), L. Izzo (INAF-OACN and DARK/NBI), D.B. Malesani (Radboud and DAWN/NBI), K. Matilainen (NOT) report:\n\nWe have observed the afterglow of GRB 230812B (Roberts et al. GCN34391, Scotton et al. GCN 34392, Zheng & Filippenko GCN 34395, Beardmore et al. GCN 34400) with AlFOSC, mounted on the 2.5m NOT telescope at Roque de los Muchachos Observatory in La Palma (Spain). \nWe have performed spectroscopy with an exposure of 3x1200s and grism #4, with a spectral coverage between 3500 and 9600 AA. The observation started at 22:14 UT, 1.136 days after the trigger.\n\nThe spectrum shows a trace throughout the complete spectral range. In a preliminary reduction we donât identify clear absorption features, but we do see weak detections of [OII], [OIII] and H-alpha at a redshift of z=0.360, as reported by de Ugarte Postigo et al. (GCN34409).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTc3ODc4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SrnNE92vwRKhRbHAZclxqGYunh_aq7oBLOy4zXO0n2o\n\n",
"published": "2023-08-14T01:51:24.651379Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T01:51:24.651399Z",
"modified": "2023-08-14T01:51:24.657941Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2567,
"topic": "gcn.circular",
"uuid": "a8462415-7780-4a7b-8f66-39a61bb0275d",
"title": "Swift Trigger 1188089 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/29 06:38:32 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34589",
"subject": "Swift Trigger 1188089 is not a GRB"
},
"message_text": "\nS. Dichiara (PSU) and K. L. Page (U Leicester) report on behalf of the\nNeil Gehrels Swift Observatory Team:\n\nSwift Trigger 1188089 (2023-08-29 06:12:48 UT) is not an astrophysical event.\nIt is a spurious trigger due to a misidentification of the Crab during\na star tracker Loss-of-Lock event.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMjkxMTE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.y-ZfTKbodlV-Z5eZZukoh2IEzu79yPPKiEBz6t8JURU\n\n",
"published": "2023-08-29T06:38:48.167928Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T06:38:48.167949Z",
"modified": "2023-08-29T06:38:48.173213Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2067,
"topic": "gcn.circular",
"uuid": "6d2fe56b-c2c6-4090-b3dd-f2757fdefcc8",
"title": "GRB 230812B: AbAO optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/14 08:02:51 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34412",
"subject": "GRB 230812B: AbAO optical observations"
},
"message_text": "S. Belkin (IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N.\nPankov (HSE, IKI) report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 230812B (Fermi GBM Team, GCN 34386; Scotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al., GCN 34399; Casentini et al., GCN 34402) with AS-32 telescope of Abastumani observatory (AbAO) in R-filter starting on Aug. 13 (UT) 17:32:00. We detected the afterglow (Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406; Leonini et al., GCN 34408; de Ugarte Postigo et al., GCNs 24409, 34410) in the stacked image. Preliminary photometry of the object is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2023-08-13 17:32:00 0.97336 R 54*60 20.35 0.24 20.9\n\nThe photometry is based on nearby SDSS stars used in (Moskvitin et al, GCN 34406):\nRA DEC R (Lupton transformations)\n16:36:35.9365104 +47:52:54.574320 14.893 0.008\n16:36:32.6835360 +47:53:44.537784 16.531 0.009\n16:36:25.6055880 +47:53:20.456304 16.827 0.009\n16:36:25.1691816 +47:52:20.931816 16.068 0.008\n16:36:44.6580984 +47:50:56.806944 15.785 0.008\n16:36:40.1374488 +47:54:02.128752 15.698 0.008\n\nThe underlying extended source galaxy mentioned by GOTO (Ackley et al., GCN 34398) is visible in Legacy Survey DR10 Catalog with r~22.66 and classified as round exponential galaxy.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDAwMTc2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ijDXpdXZ-8baoj3LX-XQJjZsPPx0wjobUgyAyiDVgYs\n\n",
"published": "2023-08-14T08:03:01.677164Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T08:03:01.677182Z",
"modified": "2023-08-14T08:03:01.683836Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2068,
"topic": "gcn.circular",
"uuid": "e11e509f-ed7d-46bd-8272-789ff21bb909",
"title": "GRB 230812B: OASDG optical observations",
"submitter": "Hop gcn.circular",
"authors": "luca.izzo@inaf.it",
"data": {
"date": "23/08/14 10:47:40 GMT",
"from": "luca.izzo@inaf.it",
"title": "GCN CIRCULAR",
"number": "34413",
"subject": "GRB 230812B: OASDG optical observations"
},
"message_text": "N. Ruocco, A. Catapano (OASDG) and L. Izzo (INAF-OACN & DARK/NBI) report:\n\nWe observed the field of GRB 230812B (Lesage et al. GCN 34387, Roberts et al. GCN 34391, Scotton et al. GCN 34392, Beardmore et al. GCN 34400, Xiong et al. GCN 34401, Casentini et al. GCN 34402, Frederiks et al. GCN 34403) with the 0.5m telescope of the Osservatorio Astronomico S. Di Giacomo located in Agerola, Italy ( https://osservatorio.astrocampania.it/ - MPC L07). We obtained multiple 300s images in the Rc filter under good weather conditions, with the first observation starting at MJD 60169.818 (1.027 days after the GRB detection).\n\nIn the final stacked image, we detect a faint source at the enhanced position reported by Swift-XRT (Beardmore et al. GCN 34400) and by optical telescopes (Zheng & Filippenko, GCN 34395, Lipunov et al., GCN 34396, Salgundi et al., GCN 34397, Ackley et al., GCN 34398, Kuin et al. GCN 34399, Mao et al., GCN 34404, Odeh et al., GCN 34405, Moskvitin et al., GCN 34406, Leonini et al., GCN 34408, de Ugarte Postigo et al. GCN 34409 & 34410, Belkin et al., GCN 34412). We measure a magnitude for the GRB afterglow of Rc(AB) = 20.51 +/- 0.16 mag. The calibration was performed using nearby stars in the Pan-STARRS PS1 catalog, and using transformation equations to Rc magnitudes. Further analyses are ongoing.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDEwMDY1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nX-x7368HYl2WAKyOX5RMlG9qvumut0Gx-WySeYz_0E\n\n",
"published": "2023-08-14T10:47:51.247417Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T10:47:51.247441Z",
"modified": "2023-08-14T10:47:51.251812Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2069,
"topic": "gcn.circular",
"uuid": "c59642bd-da62-4419-aeaf-1cd6ce338b2e",
"title": "GRB 230812B: rest-frame energetics from Konus-Wind observation",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/08/14 13:26:42 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "34414",
"subject": "GRB 230812B: rest-frame energetics from Konus-Wind observation"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nAssuming the spectrum and the observer-frame energetics of the very bright\nGRB 230812B measured by KW (GCN 34403); the source redshift z=0.360\n(de Ugarte Postigo et al., GCNs 34409, 34410); and a standard cosmology\nwith H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014);\nwe estimate the burst isotropic energy release E_iso to (1.09 ± 0.02)x10^53 erg,\nthe isotropic peak luminosity L_iso to (1.25 ± 0.05)x10^53 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum Ep,i,z to (392 ± 16) keV,\nand the rest-frame peak energy at the peak of the emission Ep,p,z to (604 ± 41) keV.\n\nWith the obtained estimates, GRB 220627A fits perfectly both 'Amati' and 'Yonetoku'\nrelations derived for the sample of >300 long KW GRBs with known redshifts\n(Tsvetkova et al., 2017; Tsvetkova et al., 2021), see\nhttp://www.ioffe.ru/LEA/GRBs/GRB230812_T68292/GRB230812B_rest_frame.pdf\nThis suggests that an energy reservoir powering the burst and its emission mechanism\nare similar to that typical of long-duration GRBs.\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDE5NjA4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4bAPZnXf3M6HBb-Yn73jeIBWNKoehe5hWUPi3LPW_8w\n\n",
"published": "2023-08-14T13:26:53.404836Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T13:26:53.404854Z",
"modified": "2023-08-14T13:26:53.410823Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2070,
"topic": "gcn.circular",
"uuid": "315b1885-cc9e-4dcb-b1b3-70de77646155",
"title": "GRB 230812B: Osservatorio Astronomico \"Nastro Verde\" optical observation",
"submitter": "Hop gcn.circular",
"authors": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"data": {
"date": "23/08/14 13:45:40 GMT",
"from": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34415",
"subject": "GRB 230812B: Osservatorio Astronomico \"Nastro Verde\" optical observation"
},
"message_text": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport: \n\nWe observed the field of GRB 230812B (Lesage et al. GCN 34387, Roberts et al. GCN 34391, Scotton et al. GCN 34392, Beardmore et al. GCN 34400, Xiong et al. GCN 34401, Casentini et al. GCN 34402, Frederiks et al. GCN 34403)\nwith telescope of Nastro Verde Observatory - Sorrento (Naples), Italy.\nMember of: \nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione\n\nThe observations started at 19:40 UT of 2023/08/13, after about 24 hours after the GRB trigger, at the end of twilight with clear skies, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 22 image of 240 sec each. All images are unfiltered, calibrated with masterdark and masterflat, stacked with Tycho Tracker and Astrometrica software\nWe have detected a clearly visible source at the enhanced position reported by Swift-XRT (Beardmore et al. GCN 34400) and by optical telescopes (Zheng & Filippenko, GCN 34395, Lipunov et al., GCN 34396, Salgundi et al., GCN 34397, Ackley et al., GCN 34398, Kuin et al. GCN 34399, Mao et al., GCN 34404, Odeh et al., GCN 34405, Moskvitin et al., GCN 34406, Leonini et al., GCN 34408, de Ugarte Postigo et al. GCN 34409 & 34410, Belkin et al., GCN 34412, Ruocco et al. GCN 34413)\nat following position\n\nRA (J2000.0) 16h 36m 31.47s \nDecl. (J2000.0) +47° 51' 32.2\" \n\nPreliminary photometry summing three sets of 7 images of 240 sec each, using Astrometrica and the UCAC4 catalog is as follows\n\n2023 08 13.83014 16 36 31.46 +47 51 32.7 19.8 R \n2023 08 13.85209 16 36 31.52 +47 51 32.1 19.8 R \n2023 08 13.87403 16 36 31.47 +47 51 32.3 20.2 R \n\n\n\nMagnitudes were estimated with the UCAC4 cat. and \nare not corrected for galactic dust extinction.\n\n\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDIwNzQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.YrIhgmEE5OMDFBA-r1ums7lRXUJaf0Z7Z9bHIwOFynI\n\n",
"published": "2023-08-14T13:45:51.871494Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T13:45:51.871511Z",
"modified": "2023-08-14T13:45:51.875557Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2071,
"topic": "gcn.circular",
"uuid": "b93ac21e-fc94-4ba3-9215-32c9543c822c",
"title": "GRB 230812B: Faulkes Telescope North optical afterglow follow-up",
"submitter": "Hop gcn.circular",
"authors": "Manisha Shrestha at University of Arizona <mshrestha1@arizona.edu>",
"data": {
"date": "23/08/14 14:17:45 GMT",
"from": "Manisha Shrestha at University of Arizona <mshrestha1@arizona.edu>",
"title": "GCN CIRCULAR",
"number": "34416",
"subject": "GRB 230812B: Faulkes Telescope North optical afterglow follow-up"
},
"message_text": "M. Shrestha (Univ. of Arizona), D. Sand (Univ. of Arizona), K. D. Alexander (Univ. of Arizona), J. Andrews (Gemini), K. Bostroem (Univ. of Arizona), J. Pearson (Univ. of Arizona), G. Hosseinzadeh (Univ. of Arizona), N. Smith (Univ. of Arizona), D. A. Howell (LCO/UCSB), C. McCully (LCO/UCSB), M. Newsome (LCO/UCSB), E Padilla Gonzalez (LCO/UCSB), C. Pellegrino (LCO/UCSB), G. Terreran (LCO/UCSB), J. Farah (LCO/UCSB) report on behalf of a wider Global Supernova Project collaboration:\n\nWe observed the field of Swift GRB 230812B (Fermi GBM GCN 34386) with Faulkes Telescope North, on 2023-08-14 at 5:50:39 UT (60170.2435 MJD, ~1.45 days after the trigger) using the MuSCAT3 imager in the g,r, and i bands. Data were calibrated with respect to nearby SDSS sources.\n\nWe clearly detect the optical counterpart in the g,r, and i bands. The magnitudes are as follows:\ng = 21.38 +- 0.07\nr = 20.81 +- 0.04\ni = 20.71 +- 0.07\n\nThese values are not corrected for galactic extinction.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDIyNjcxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.F1mXPgfGjZ-OcpWexCWTyKDs9A1SDwI1iJW19b3VzoE\n\n",
"published": "2023-08-14T14:17:56.575563Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T14:17:56.575582Z",
"modified": "2023-08-14T14:17:56.581270Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2072,
"topic": "gcn.circular",
"uuid": "b20b89b6-80bb-43e0-a288-169c3c95a7a7",
"title": "GRB 230812B: Bassano Bresciano Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"data": {
"date": "23/08/14 14:26:48 GMT",
"from": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"title": "GCN CIRCULAR",
"number": "34417",
"subject": "GRB 230812B: Bassano Bresciano Observatory optical observations"
},
"message_text": "U.Quadri and L.Strabla (Bassano Bresciano Astronomical Observatory),\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport:\n\nWe imaged the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395;\nLipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398;\nXiong et al., GCN 34401; Casentini et al., GCN 34002; Frederiks et al., GCN 34403;\nMao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406)\ndetected by FERMI(trigger 713559497.049606 / 230812790)\nwith the robotic telescope of (IAU station 565) Bassano Bresciano\nObservatory, Italy. Member of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.\nGAC - Gruppo Astrofili Cremonesi.\n\nThe observations started 24.57 hour after the FERMI trigger, At the end of twilight\nwith our Newton telescope D%0 mm F/D=4.8\n\nWeather conditions were good.\n\nWe co-added 2 series of 70 exposures of 60 sec each.\n\nStart T0+ End T0+\n24.57 hour 27.09 hour\n\nWe detected a (fading) afterglow in the error box of the XRTcandidate.\nat the following position (+/- 2 arcsec):\n\nRA (J2000.0) = 16h 36m 31.51s\nDEC(J2000.0) = +47d 51p 32.2s\n\nThe results of our photometry are:\n\n-----------------------------------\n JD Mag Err Flt\n-----------------------------------\n2460170.36459 19.9 +/- 0.2 CR\n2460170.38708 20.1 +/- 0.2 CR\n\nCR is unfiltered with R zero point.\n\nMagnitudes were estimated with the PanSTARRS cat. and\nare not corrected for galactic dust extinction.\n\nReference:\nhttp://www.osservatoriobassano.org/GRB.asp\n\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDIzMjEzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Jv-sRDGlfBngATwfW2djG7RZLt8Qyryh3fZldxjhTtw\n\n",
"published": "2023-08-14T14:26:59.406428Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T14:26:59.406446Z",
"modified": "2023-08-14T14:26:59.412409Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2073,
"topic": "gcn.circular",
"uuid": "ac2340d0-fffa-4cb0-a5f2-16190a6d5176",
"title": "GRB 230812B : optical observations from Observatoire de Haute-Provence",
"submitter": "Hop gcn.circular",
"authors": "Emeric Le Floc'h at CEA-Saclay <emeric.lefloch@cea.fr>",
"data": {
"date": "23/08/14 15:16:09 GMT",
"from": "Emeric Le Floc'h at CEA-Saclay <emeric.lefloch@cea.fr>",
"title": "GCN CIRCULAR",
"number": "34418",
"subject": "GRB 230812B : optical observations from Observatoire de Haute-Provence"
},
"message_text": "C. Adami (LAM), T. Adami (ENS Paris-Saclay), B. Schneider (MIT), A. Saccardi (GEPI, Obs. de Paris), A. de Ugarte Postigo (OCA, CNRS), E. Le Flocâh, F. Schüssler, D. Turpin (CEA-Saclay), S. D. Vergani, J. P. Palmerio (GEPI, Obs. de Paris), S. Basa (LAM), D. Götz (CEA-Saclay), S. Antier (OCA) report, on behalf of a larger collaboration:\n\nWe observed the field of GRB 230812B (Fermi GBM Team GCN, 34386; Roberts et al., GCN 34391; Scotton et al., GCN 34392; Page et al., GCN 34394; Zheng & Filippenko, GCN 34395; Kuin et al., GCN 34399; Beardmore et al., GCN 34400; Casentini et al., GCN 34402; de Ugarte Postigo et al., GCN 24409, 34410) using the T120 telescope of Observatoire de Haute Provence (OHP) in imaging mode. We obtained 10x360s exposures in the V-band with a mid-epoch of 2023-08-13 22:00 UT (~1 day after trigger), 2x300s exposures in the R-band with a mid-epoch of 2023-08-14 00:00 UT, and 10x360s exposures in the I band with a mid-epoch of 2023-08-13 20:40 UT.\nWe derive the following photometry, calibrated against the Pan-STARRS catalog and not corrected for Galactic dust reddening:\n\nV = 20.87 +/- 0.08 mag\nR = 20.64 +/- 0.09 mag\nI = 19.77 +/- 0.04 mag\n\nWe also observed the field of GRB 230812B using the T193cm equipped with the MISTRAL spectro-imager. We obtained 4x300s + 1x60s exposures in the râ band at a mid-epoch of 2023-08-13 20:15 UT, leading to the following preliminary photometry estimate:\n\nrâ = 20.32 +/- 0.06 mag\n\nWe finally obtained 1h of exposure (2x15min + 1x30min) in spectroscopic mode, using the blue setting of MISTRAL. We clearly detect the continuum associated with the transient emission, leading to a redshift upper limit (z<2.5) consistent with the redshift determination obtained by the GTC and the NOT (de Ugarte Postigo et al., GCN 24409, 34410). The signal to noise in the final combined spectrum is however not sufficient to securely identify any absorption line.\n\nWe acknowledge Claire Moutou as well as the excellent support from Jean Balcaen and Yoann Degot-Longhi (Observatoire de Haute Provence).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDI2MTc0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.HOo3ULvzhrKoQ5BBrXBf0XJBIvv0yalWKKaJD_PO77c\n\n",
"published": "2023-08-14T15:16:23.971109Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T15:16:23.971126Z",
"modified": "2023-08-14T15:16:23.977156Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2074,
"topic": "gcn.circular",
"uuid": "05f78bed-1ff3-4066-a6db-9ebedc28da59",
"title": "GRB 230812B: Leavitt Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "leavittob@gmail.com",
"data": {
"date": "23/08/14 16:37:57 GMT",
"from": "leavittob@gmail.com",
"title": "GCN CIRCULAR",
"number": "34419",
"subject": "GRB 230812B: Leavitt Observatory optical observations"
},
"message_text": "L. Moretti and E. Pavoni (Leavitt Observatory), in a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Università degli Studi Di Salerno)\nreport: \n\nWe observed the field of GRB 230812B (Fermi GBM Team GCN, 34386; Roberts et al., GCN 34391; Scotton et al., GCN 34392; Page et al., GCN 34394; Zheng & Filippenko, GCN 34395; Kuin et al., GCN 34399; Beardmore et al., GCN 34400; Casentini et al., GCN 34402; de Ugarte Postigo et al., GCN 34409, 34410) with the telescope of Leavitt Observatory, Italy. Member of: \n\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nATA - Associazione Tuscolana di Astronomia.\n\nThe observations began at 20:35 UT on 2023/08/13 (~1 day after the FERMI trigger), at the end of twilight, with our RC telescope D=250 mm F/D=8.\n\nWeather conditions were good.\n\nWe took 9 images of 240 sec each. All images are unfiltered, calibrated with master dark and master flat, stacked with ASTAP software.\n\nWe detected the afterglow at the following position:\nRA(J2000) = 16h 36m 31.48s\nDec(J2000) = +47° 51' 32.1\"\n\nWe measured its brightness of 20.78 +/- 0.2 mag in our coadd image in clear band, at a mid-time of 25.913 hours after the FERMI trigger, JD 2460170.36944. \n\nMagnitudes were estimated with the Gaia (BP) DR3 cat. and are not corrected for galactic dust extinction.\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDMxMDgzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.HYAiRT1Z5CbKTeK_OKF3Eiyhh6GJDhBDUDL3ng3w-6g\n\n",
"published": "2023-08-14T16:38:08.801730Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T16:38:08.801748Z",
"modified": "2023-08-14T16:38:08.809138Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2572,
"topic": "gcn.circular",
"uuid": "bd98de09-4bf0-4138-98ae-f8dc82385f70",
"title": "GRB 230828A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/08/29 11:14:43 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34590",
"subject": "GRB 230828A: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 230828A (AstroSat trigger at 2023-08-28 16:29:43 UT, INTEGRAL/SPI-ACS detection at 2023-08-28 ~16:28:55 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-08-28 16:29:53 UTC. The T90 duration measured by GRBAlpha is 140 s and the overall significance during T90 reaches 27 sigma.\n\nThe light curve obtained by GRBAlpha is available here: \nhttps://grbalpha.konkoly.hu/static/share/GRB230828A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzA3Njg5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Wm8ifRFiaRseNROw5d8_WIG-kPYCHsQ9RIRCRxdbTfs\n\n",
"published": "2023-08-29T11:14:57.589201Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T11:14:57.589219Z",
"modified": "2023-08-29T11:14:57.594548Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 3408,
"topic": "gcn.circular",
"uuid": "547825f6-f715-4ce8-9c04-d45fe83fb872",
"title": "Swift Triggers 1192745 and 1192747 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/09/27 07:46:34 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34774"
},
"title": "GCN CIRCULAR",
"number": "34774",
"subject": "Swift Triggers 1192745 and 1192747 are not astrophysical events"
},
"message_text": "K. L. Page (U Leicester) reports on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nTo conclude the summary of false triggers caused by the Swift star tracker\nloss-of-lock event on 2023-09-26, triggers 1192745 and 1192747 (at 22:53\nand 23:00 UT respectively) were also not astrophysical events.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34774.",
"published": "2023-09-28T20:53:59.352157Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-28T20:53:59.352176Z",
"modified": "2023-09-28T20:53:59.357551Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2077,
"topic": "gcn.circular",
"uuid": "55c36d5b-14cd-4dbe-b0f0-8f5e20cbc3d0",
"title": "GRB 230814A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/14 19:05:27 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34422",
"subject": "GRB 230814A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 18:54:56 UT on 14 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230814A (trigger 713732101.037422 / 230814788).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 288.8, Dec = -14.2 (J2000 degrees, equivalent to J2000 19h 15m, -14d 11'), with a statistical uncertainty of 4.0 degrees.\n\nThe angle from the Fermi LAT boresight is 100.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230814788/quicklook/glg_skymap_all_bn230814788.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/bn230814788/quicklook/glg_healpix_all_bn230814788.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230814788/quicklook/glg_lc_medres34_bn230814788.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDM5OTMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.eD-nhBkR9i_juZKDiDtec6A2sctzeksfopg8BI_FYJA\n\n",
"published": "2023-08-14T19:05:38.234923Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T19:05:38.234942Z",
"modified": "2023-08-14T19:05:38.240263Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2078,
"topic": "gcn.circular",
"uuid": "1df7984b-8672-4db7-a08b-e87c5f6f9a2e",
"title": "GRB 230812B: CrAO ZTSh optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/14 19:08:13 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34423",
"subject": "GRB 230812B: CrAO ZTSh optical observations"
},
"message_text": "S. Belkin (IKI), V. Rumyantsev (CrAO), N. Pankov (HSE, IKI), A. Pozanenko (IKI) report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 230812B (Fermi GBM Team, GCN 34386; Scotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al., GCN 34399; Casentini et al., GCN 34402; Frederiks et al., GCN 34403) with ZTSH 2.6m telescope of CrAO observatory in R-filter. We detected the afterglow (e.g. Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Mao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406; Leonini et al., GCN 34408; de Ugarte Postigo et al., GCNs 24409, 34410; Belkin et al., GCN 34412, 34421) in a stacked image. Preliminary photometry of the object is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2023-08-13 19:24:53 1.03829 R 39*120 20.25 0.05 23.3\n\nThe photometry is based on nearby SDSS stars used in (Moskvitin et al, GCN 34406):\nRA DEC R (Lupton transformations)\n16:36:35.9365104 +47:52:54.574320 14.893 0.008\n16:36:32.6835360 +47:53:44.537784 16.531 0.009\n16:36:25.6055880 +47:53:20.456304 16.827 0.009\n16:36:25.1691816 +47:52:20.931816 16.068 0.008\n16:36:44.6580984 +47:50:56.806944 15.785 0.008\n16:36:40.1374488 +47:54:02.128752 15.698 0.008\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDQwMDk4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.X8Ldi-NMdKnQS0b89lkUR9bNGAY2XMOjQnDLjq0ugY8\n\n",
"published": "2023-08-14T19:08:22.727741Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T19:08:22.727759Z",
"modified": "2023-08-14T19:08:22.731285Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2108,
"topic": "gcn.circular",
"uuid": "460a8974-2d02-45d6-a63c-da874b9db338",
"title": "Fermi GRB 230814A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/15 18:01:46 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34438",
"subject": "Fermi GRB 230814A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 230814A ( Fermi GBM team, GCN 34422) errorbox 82226 sec after notice time and 82259 sec after trigger time at 2023-08-15 17:45:55 UT, with upper limit up to 16.4 mag. Observations started at twilight. The observations began at zenith distance = 61 deg. The sun altitude is -10.2 deg.\n\nThe galactic latitude b = -12 deg., longitude l = 23 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"54257\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 82290 | 2023-08-15 17:45:55 | MASTER-Tavrida | (19h 18m 54.47s , -11d 57m 39.1s) | C | 60 | 16.2 |\n 82364 | 2023-08-15 17:47:10 | MASTER-Tavrida | (19h 02m 19.60s , -17d 37m 39.4s) | C | 60 | 16.4 |\n 82438 | 2023-08-15 17:48:23 | MASTER-Tavrida | (19h 18m 19.74s , -17d 38m 18.6s) | C | 60 | 16.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTIyNTExLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.h7KiAyyQrBTiqSjIJpuKuTW4DJbHdX29L1rME2T1HM8\n\n",
"published": "2023-08-15T18:01:56.889649Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T18:01:56.889668Z",
"modified": "2023-08-15T18:01:56.895616Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2109,
"topic": "gcn.circular",
"uuid": "f619dcfc-e6bf-49b6-80c9-05d9ecbf727b",
"title": "Swift GRB 230815A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/15 19:54:30 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34439",
"subject": "Swift GRB 230815A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 230815A ( N. J. Klingler et al., GCN 34434) errorbox 27081 sec after notice time and 28191 sec after trigger time at 2023-08-15 18:41:55 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 58 deg. The sun altitude is -32.4 deg.\n\nThe galactic latitude b = 4 deg., longitude l = 299 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"54590\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 28282 | MASTER-SAAO | C | 180 | 16.8 |\n 29125 | MASTER-SAAO | C | 180 | 17.4 |\n 29335 | MASTER-SAAO | C | 180 | 17.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTI5Mjc1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.X52TKX0n3OUBikD_BshW7aidhi1nIuS5d3P1gwLPQnw\n\n",
"published": "2023-08-15T19:54:41.270870Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T19:54:41.270917Z",
"modified": "2023-08-15T19:54:41.276612Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2079,
"topic": "gcn.circular",
"uuid": "754bce46-1238-486e-9974-adef27976558",
"title": "GRB 230814A: BALROG localization (Fermi Trigger 713732101 / GRB 230814788)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "23/08/14 19:28:45 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"title": "GCN CIRCULAR",
"number": "34424",
"subject": "GRB 230814A: BALROG localization (Fermi Trigger 713732101 / GRB 230814788)"
},
"message_text": "B. Biltzinger, T. Preis, J. Burgess & J. Greiner (all MPE Garching) report:\n\nThe public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger\n713732101 at 18:54:56 on 14 Aug. 2023 were automatically fitted for spectrum\nand sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;\nBerlato et al. 2019, ApJ 873, 60).\n\nThe best-fit position (1 sigma statistical errors) is:\nRA(2000.0) = 288.4+/-1.2 deg\nDecl.(2000.0) = -12.0+/-1.3 deg\nWe estimate an additional systematic error of 1 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB230814788/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB230814788/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB230814788/json\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDQxMzMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.aJss72jQkpuon3XT5pER328aNgLQeSO0r7rDQSFNApY\n\n",
"published": "2023-08-14T19:28:56.643624Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T19:28:56.643642Z",
"modified": "2023-08-14T19:28:56.648773Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2080,
"topic": "gcn.circular",
"uuid": "9e04f323-6ec6-4f7d-afa9-f0fcc441f5ac",
"title": "GRB 230812B: GRANDMA further observations of ZTF23aaxeacr candidate afterglow",
"submitter": "Hop gcn.circular",
"authors": "Aleksandra Pyshna at Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine <pyshnaya.sasha@gmail.com>",
"data": {
"date": "23/08/14 21:28:38 GMT",
"from": "Aleksandra Pyshna at Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine <pyshnaya.sasha@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34425",
"subject": "GRB 230812B: GRANDMA further observations of ZTF23aaxeacr candidate afterglow"
},
"message_text": "O. Pyshna (AO TSNU of Kyiv), Z. Vidadi (ShAO), S. Beradze (AbAO), Y.Rajabov (UBAI), D. Aql (American Uni. SHJ), S. Antier (OCA), M. Coughlin (UMN), J. Peloton, P. Hello (IJCLAB), S. Karpov, M. Prouza, M. Mašek, M. Blazek (FZU), A. Klotz (IRAP),T. Pradier (Univ. Strasbourg), I. Tosta e Melo (UNICT), D. Turpin (CEA), A. Takey, E. G. Elhosseiny, A. Abulwfa, M. A. El-Sadek, M. Molham (NRIAG), R. Inasaridze, R. Natsvlishvili, N. Kochiashvili, V. Aivazyan (AbAO), A. Baransky, Y. Romanyuk, O. Sokoliuk, A. Simon, V. Vasylenko (Lisnyky) report on behalf of the GRANDMA collaboration:\n\nGRANDMA observed the field of GRB 230812B (Lesage et al. GCN 34387; Scotton et al. GCN 34392; Page GCN 34394; Zheng\n& Filippenko GCN 34395; Lipunov et al. GCN 34396; Ackley et al. GCN 34398; Xiong et al. GCN 34401; Casentini et al. 34402; Frederiks et al. 34403; Mao et al. 34404; Odeh et al. 34405; Moskvitin & Spiridonova 34406; Leonini et al. 34408; de Ugarte Postigo et al. 34409; de Ugarte Postigo et al. 34410; Belkin et al. 34412; Ruocco et al. 34413; Frederiks et al. 34414; Ruocco et al. 34415; Shrestha et al. 34416; Quadri et al. 34417; Adami et al. 34418; Moretti et al. 34419; Kumar et al. 34420; Belkin et al. 34421) \nin particular ZTF23aaxeacr candidate afterglow (16:36:31.483 +47:51:32.26) (Salgundi et al. GCN 34397) \n\n\nThe first observation began about 22.56 hours from the trigger.\n\n\nAs time reference (T0), we choose: 2023-08-12T18:58:12 (60168.79041667 MJD) (Fermi GBM Team 34386)\n\nIn the following table we report a subset of the preliminary photometry\nof our observations. Magnitudes and upper limits are reported\nin the AB system.\n\nZTF23aaxeacr:\n\nT-T0 (day) |MJD |Obser. |Exposure| Filter | Mag +/- err |Upp.Lim. (AB)\n--------------------------------------------------------------------------\n0.940|60169.73055556 |Abastumani-T70|46X60s |sdssr|20.35+/-0.12|21.3 (5sig)\n0.959|60169.75012731 | KAO |10X180s|sdssg|20.53+/-0.05|21.7 (5sig)\n0.988|60169.77848380 | KAO |10X180s|sdssr|20.23+/-0.05|21.5 (5sig)\n1.021|60169.81137731 | KAO |20X150s|sdssi|20.17+/-0.03|22.3 (5sig)\n1.115|60169.90562500 | FRAM-CTA-N |50X60s | R | - |>19.1 (Vega)\n\n\nKAO data has been calibrated with respect to the PS1 catalog.\nAbastumani-T70 data has been calibrated with respect to the PS1 catalog, with the Johnson cousin conversion into sloan r.\nFRAM-CTA-N data has been calibrated with respect to the APASS catalog.\n\nGRANDMA is a worldwide coordinated telescope network\n(grandma.ijclab.in2p3.fr) devoted to the observation of transients\nin the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS\n497, 5518). Kilonova-Catcher (KNC) is the citizen science program of\nGRANDMA (http://kilonovacatcher.in2p3.fr/).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDQ4NTI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.UqyV-qfa0w_jmGfT62x30KpG9weA-YnPi8K_X_1QmYE\n\n",
"published": "2023-08-14T21:28:49.877039Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T21:28:49.877056Z",
"modified": "2023-08-14T21:28:49.881025Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2573,
"topic": "gcn.circular",
"uuid": "8215fc12-3b67-4f2e-8310-380a30064f9d",
"title": "GRB 230828A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/29 12:00:17 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34591",
"subject": "GRB 230828A: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), B. Pari (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 230828A which was also detected by GRBAlpha (Dafcikova et al., GCN Circ. 34590).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-28 16:28:57.50 UTC. The measured peak count rate associated with the burst is 152 (+47, -8) counts/s above the background in the combined data of all quadrants, with a total of 4190 (+848, -887) counts. The local mean background count rate was 434 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 142 (+18, -22) s.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-28 16:29:43.14 UTC. The measured peak count rate associated with the burst is 410 (+75, -17) counts/s above the background in the combined data of all quadrants, with a total of 10117 (+1492, -1750) counts. The local mean background count rate was 1341 (+3, -4) counts/s. We measure a T90 of 123 (+10, -6) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzEwNDIyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9._NMsB91EiGKBgd8c1tgIgSUD1rL1T5jXz2bJ7fDVEHg\n\n",
"published": "2023-08-29T12:00:27.475375Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T12:00:27.475393Z",
"modified": "2023-08-29T12:00:27.479377Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2082,
"topic": "gcn.circular",
"uuid": "42538506-902f-41e9-aee5-602bbaba0ad4",
"title": "LIGO/Virgo/KAGRA S230814r: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "charlie.hoy@port.ac.uk",
"data": {
"date": "23/08/14 22:26:38 GMT",
"from": "charlie.hoy@port.ac.uk",
"title": "GCN CIRCULAR",
"number": "34426",
"subject": "LIGO/Virgo/KAGRA S230814r: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further offline analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230814r (GCN Circular 34411). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230814r\n\nFor the Bilby.multiorder.fits sky map, the 90% credible region is 3389 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3788 +/- 1416 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDUyMDAzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ok1lNHQuSTMHdQTZ8WWpgjFz_F1FlbaydYGBnfwqKZE\n\n",
"published": "2023-08-14T22:26:49.558227Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T22:26:49.558248Z",
"modified": "2023-08-14T22:26:49.562213Z",
"nonlocalizedevents": [
{
"event_id": "S230814r"
}
],
"targets": []
},
{
"id": 2083,
"topic": "gcn.circular",
"uuid": "076e3a4b-3f15-412c-a780-e88d12bc26a5",
"title": "GRB 230812B: Upper limits from a neutrino search with IceCube",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/08/14 22:45:46 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "34427",
"subject": "GRB 230812B: Upper limits from a neutrino search with IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search for track-like muon neutrino events arriving from the direction of GRB 230812B (GCN Circular 34391 (Fermi-GBM), 34392 (Fermi-LAT)) at the position determined by Swift-XRT (GCN Circular 34394) in a time range of -1 hour/+2 hours from the initial trigger reported by Fermi-GBM (T0 23-08-12 18:58:12.05 UTC) during which IceCube was collecting good quality data.\n\nZero track-like events are found to coincide with the position of the GRB. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 5.1 x 10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies in the approximate energy range between 600 GeV and 300 TeV.\n\nA subsequent search was performed including 2 days of data centered on the Fermi-GBM trigger (2023-08-11 18:58:12.05 UTC to 2023-08-13 18:58:12.05 UTC). In this case, we report a p-value of 1.0, consistent with background expectation. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 5.4 x 10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law.\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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDUzMTUxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.m-6H7GFeq9TV8eA1Fh85Uw1ZyTb9HwIVuMrVIyrRj7w\n\n",
"published": "2023-08-14T22:45:56.518703Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T22:45:56.518723Z",
"modified": "2023-08-14T22:45:56.522508Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2087,
"topic": "gcn.circular",
"uuid": "7abb945a-e517-4416-8482-9ce8a57aa82c",
"title": "GRB 230812B: further SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/15 00:02:33 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34428",
"subject": "GRB 230812B: further SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS), report on behalf of\nthe GRB follow-up team.\n\nWe observed the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN\n34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley\net al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN\n34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et\nal., GCN 34405; Moskvitin & Spiridonova GCN 34406; Leonini et al. GCN\n34408; de Ugarte Postigo et al. GCN 34409; de Ugarte Postigo et al.\nGCN 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks\net al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416;\nQuadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN\n34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423;\nPyshna et al., GCN 34425) with the 1-m telescope of SAO RAS Zeiss-1000\nequipped with the CCD photometer. We obtained 5 x 300 sec. images in\nRc band on August 14, 19:51:04--20:21:03 UT\n\nThe OT is clearly detected in our stacked frame with the brightness of\nR = 21.20 +/- 0.09 (t_mid - t0 = 2.0471 days).\n\nThis preliminary photometry is based on the nearby SDSS stars;\nmagnitudes are converted using Lupton (2005) equations.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDU3NzU5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.hMJf-HjeB_l4Zbe-V8rS6-ZPW69uhDGbSJaQns2Pcwo\n\n",
"published": "2023-08-15T00:02:43.462059Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T00:02:43.462078Z",
"modified": "2023-08-15T00:02:43.465928Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2088,
"topic": "gcn.circular",
"uuid": "1853d6cf-72bd-4abd-9a91-26c9da31ea94",
"title": "LIGO/Virgo/KAGRA S230814ah: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "ìµìì° <choisy4044@gmail.com>",
"data": {
"date": "23/08/15 00:04:16 GMT",
"from": "ìµìì° <choisy4044@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34429",
"subject": "LIGO/Virgo/KAGRA S230814ah: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230814ah during\nreal-time processing of data from LIGO Livingston Observatory (L1) at\n2023-08-14 23:09:01.810 UTC (GPS time: 1376089759.810). The candidate\nwas found by the GstLAL [1] analysis pipeline.\n\nS230814ah is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.8e-21 Hz, or about one in 1e13\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230814ah\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [2] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 27 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n24222 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 405 +/- 124 Mpc (a posteriori mean +/-\nstandard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDU3ODU4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.vmSG-D3bO6khXVeZw6j0uWzVKMdSCVzl2zb7z4KA6Q8\n\n",
"published": "2023-08-15T00:04:22.832731Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T00:04:22.832752Z",
"modified": "2023-08-15T00:04:22.837590Z",
"nonlocalizedevents": [
{
"event_id": "S230814a"
}
],
"targets": []
},
{
"id": 2097,
"topic": "gcn.circular",
"uuid": "81b49559-2310-48e3-99de-079d7003d86d",
"title": "GRB 230812B: Further Bassano Bresciano Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"data": {
"date": "23/08/15 09:18:46 GMT",
"from": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"title": "GCN CIRCULAR",
"number": "34430",
"subject": "GRB 230812B: Further Bassano Bresciano Observatory optical observations"
},
"message_text": "U.Quadri and L.Strabla (Bassano Bresciano Astronomical Observatory),\n\nMembers of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.\nGAC - Gruppo Astrofili Cremonesi.\n\nIn a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport:\n\nWe re-observed the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN\n34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley\net al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN\n34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et\nal., GCN 34405; Moskvitin & Spiridonova GCN 34406; Leonini et al. GCN\n34408; de Ugarte Postigo et al. GCN 34409; de Ugarte Postigo et al.\nGCN 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks\net al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416;\nQuadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN\n34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423;\nPyshna et al., GCN 34425) with our 0.25-m Newton robotic telescope.\n\nWe coadded 155 x 60 sec. unfiltered images on August 14 2023,\nfrom 19:46:11 to 22:32:27 UT\n\nWe confirm a fading afterglow at the following coordinates +/- 0.2 arcsec:\n\nRA (J2000.0) = 16h 36m 31.51s\nDEC(J2000.0) = +47d 51p 32.2s\n\nThe results of OT photometry are:\n\n-----------------------------------\n JD mag Err Flt\n-----------------------------------\n2460171.43558 20.5 +/- 0.3 CR\n\n\nCR is unfiltered with Rc zero point.\n\nMagnitudes were estimated with the Pan-STARRS cat.\nand are converted using Lupton (2005) equations.\n\nNot corrected for galactic dust extinction.\n\nReference:\nhttp://www.osservatoriobassano.org/GRB.asp\n\nThe message may be cited.\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDkxMTMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.i72M8V-_er-_aqd2VFZS_N18PlX6vhPeaTi9h8QQwqY\n\n",
"published": "2023-08-15T09:19:02.682098Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T09:19:02.682117Z",
"modified": "2023-08-15T09:19:02.686067Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2099,
"topic": "gcn.circular",
"uuid": "0eba16e5-45c9-4639-b9e2-45d1dfc4759b",
"title": "GRB 230812B: Optical observaions from Rozhen Observatory",
"submitter": "Hop gcn.circular",
"authors": "Eslam Elhosseiny at NRIAG <eslam_elhosseiny@nriag.sci.eg>",
"data": {
"date": "23/08/15 09:34:23 GMT",
"from": "Eslam Elhosseiny at NRIAG <eslam_elhosseiny@nriag.sci.eg>",
"title": "GCN CIRCULAR",
"number": "34431",
"subject": "GRB 230812B: Optical observaions from Rozhen Observatory"
},
"message_text": "B. Mihov, L. Slavcheva-Mihova (Institute of Astronomy and NAO, Bulgaria),\nEslam G. Elhosseiny, Ali Takey (National Research Institute of Astronomy and Geophysics (NRIAG), Egypt)\nWe observed the field of GRB 230812B, detected by Fermi GBM team (GCN 34386; GCN 34387) with the 50/70 cm Schmidt telescope at Rozhen NAO, Bulgaria. The observations started at 19:43 UT of 2023-08-13, 24.75 hours after Fermi detection. We took 18 images with 180 sec in I-band. The stacked image was calibrated in Cousins I-band after transformation from the PS1 catalogue. The counterpart of GRB 230812B was detected with 19.82 +/- 0.15 mag at the position of RA and Dec as 16° 36' 31.5\" and 47° 51' 31.81\" respectively, which is within the uncertainty of the X-ray position (GCN 34400).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDkyMDY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.eZS_qEGGNPkhzrG8je5oCzdoQp9D3DsZz9XYAT97VrU\n\n",
"published": "2023-08-15T09:34:34.166613Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T09:34:34.166644Z",
"modified": "2023-08-15T09:34:34.171103Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2100,
"topic": "gcn.circular",
"uuid": "73ff4c8f-82ff-4603-abb0-ab9fe2721646",
"title": "GRB 230812B: continued AbAO optical afterglow observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/15 09:36:05 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34432",
"subject": "GRB 230812B: continued AbAO optical afterglow observations"
},
"message_text": "S. Belkin (IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N. Pankov (HSE, IKI) report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 230812B (Fermi GBM Team, GCN 34386; Scotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al., GCN 34399; Casentini et al., GCN 34402) with AS-32 telescope of Abastumani observatory (AbAO) in R-filter starting on Aug. 14 (UT) 17:47:21. We detected the afterglow (Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406; Leonini et al., GCN 34408; de Ugarte Postigo et al., GCNs 24409, 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks et al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416; Quadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN 34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423; Pyshna et al!\n ., GCN 34425) in the stacked image. Preliminary photometry of the object is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2023-08-14 17:47:21 1.99199 R 94*60 21.16 0.21 22.0\n\nThe photometry is based on nearby SDSS stars used in (Moskvitin et al, GCN 34406):\nRA DEC R (Lupton)\n16:36:35.9365104 +47:52:54.574320 14.893 0.008\n16:36:32.6835360 +47:53:44.537784 16.531 0.009\n16:36:25.6055880 +47:53:20.456304 16.827 0.009\n16:36:25.1691816 +47:52:20.931816 16.068 0.008\n16:36:44.6580984 +47:50:56.806944 15.785 0.008\n16:36:40.1374488 +47:54:02.128752 15.698 0.008\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDkyMTY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.xPgkpiSfCoUHGYpge9FKYP0L3oOe1DRvGeEFlUkw_YI\n\n",
"published": "2023-08-15T09:36:12.515605Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T09:36:12.515623Z",
"modified": "2023-08-15T09:36:12.520579Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2574,
"topic": "gcn.circular",
"uuid": "e45f9518-112c-47c5-bd65-682235aa10d5",
"title": "GRB 230826A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "23/08/29 15:27:50 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34592",
"subject": "GRB 230826A: Swift-BAT refined analysis"
},
"message_text": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\n\nUsing the data set from T-61 to T+1091 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230826A (trigger #1187463)\n(Eyles-Ferris, et al., GCN Circ. 34565). The BAT ground-calculated position is\nRA, Dec = 83.048, 66.129 deg which is\nRA(J2000) = 05h 32m 11.5s\nDec(J2000) = +66d 07' 43.9\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 87%.\n\n\nThe mask weighted light curve shows two main emission episodes where the first has\nenhanced structure. T90 (15-350 keV) is 41.07 +- 2.36 sec (estimated error including systematics).\n\n\nThe time-averaged spectrum from T-4.26 to T+56.79 sec is best fit by a power law\nwith an exponential cutoff. This fit gives a photon index 1.20 +- 0.22,\nand Epeak of 122.3 +- 70.2 keV (chi squared 44.78 for 56 d.o.f.). For this\nmodel the total fluence in the 15-150 keV band is 3.6 +- 0.1 x 10^-06 erg/cm2\nand the 1-sec peak flux measured from T+2.44 sec in the 15-150 keV band is\n3.0 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index\nof 1.55 +- 0.05 (chi squared 52.29 for 57 d.o.f.). All the quoted errors\nare at the 90% confidence level.\n\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1187463/BA/ <http://gcn.gsfc.nasa.gov/notices_s/1187463/BA/>\n\n\n\n\n\n\n\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzIyODc1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.bXSY9FGj5pwWDNOjBlgoPAWGqnkOTicxbu7LvGiys6E\n\n",
"published": "2023-08-29T15:28:05.111352Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T15:28:05.111369Z",
"modified": "2023-08-29T15:28:05.116529Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2992,
"topic": "gcn.circular",
"uuid": "41b405ee-e9f5-4419-8842-c25560f53b8b",
"title": "GRB 230913A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "matthew.kerr@gmail.com",
"data": {
"date": "23/09/14 21:40:12 GMT",
"from": "matthew.kerr@gmail.com",
"title": "GCN CIRCULAR",
"number": "34696",
"subject": "GRB 230913A: Glowbug gamma-ray detection"
},
"message_text": "M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report:\n\nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 230913A, which was also detected by Fermi/GBM, CALET, and Swift/BAT-GUANO (GCN 34680, 34683)\n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-09-13 07:56:06.008 with a duration of 12.3 s and a total significance of about 22.2 sigma.\n \nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=2.0 and a cutoff energy (\"Epeak\") of 152 keV. The modeled 10-10000 keV fluence is 7.7e-07 erg/cm^2.\n \nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34696.\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjk0NzI3NjE2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SYieXfOE4GgZXlDA8H6Ybpa_jeeHwnYKv3rlrC8wk98\n\n",
"published": "2023-09-14T21:40:30.545053Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-14T21:40:30.545072Z",
"modified": "2023-09-14T21:40:30.551552Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2103,
"topic": "gcn.circular",
"uuid": "9bd00172-1acb-4c79-8755-dcef984f8569",
"title": "GRB 230812B: AMI-LA radio detection of afterglow candidate",
"submitter": "Hop gcn.circular",
"authors": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"data": {
"date": "23/08/15 10:57:05 GMT",
"from": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34433",
"subject": "GRB 230812B: AMI-LA radio detection of afterglow candidate"
},
"message_text": "Lauren Rhodes, Joe Bright, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:\n\nWe observed the field of the gamma-ray burst GRB 230812B (GCN 34286) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 18:13:51.9 on 14-Aug-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 J1658+4737 was used as an interleaved complex gain calibrator.\nWe detect a unresolved source at a position consistent with the one reported in GCN 34394 with a (preliminary) peak flux density of 280uJy/beam. The rms noise in the field is 40uJy/beam. Further observations are planned.\n\nWe thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDk3MDMwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.P15Jm4McvKFWDrztAz4SrbKOUuEvBoM8zaAO4Ws4y04\n\n",
"published": "2023-08-15T10:57:15.709226Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T10:57:15.709264Z",
"modified": "2023-08-15T10:57:15.718340Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2104,
"topic": "gcn.circular",
"uuid": "f1989f9f-e9c4-4d1b-a4dc-6a876375616e",
"title": "GRB 230815A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/15 11:25:59 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34434",
"subject": "GRB 230815A: Swift detection of a burst"
},
"message_text": "\nN. J. Klingler (GSFC/UMBC/CRESSTII), C. Gronwall (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL) and\nT. M. Parsotan (GSFC/UMBC/CRESSTII) report on behalf of the Neil\nGehrels Swift Observatory Team:\n\nAt 10:49:55 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230815A (trigger\u001185505). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 184.772, -58.065 which is\n RA(J2000) = 12h 19m 05s\n Dec(J2000) = -58d 03' 53\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a single-peaked\nstructure with a duration of about 2 sec. The peak count rate\nwas ~6000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 10:52:04.0 UT, 128.1 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source located at RA, Dec 184.72347, -58.05386 which\nis equivalent to:\n RA(J2000) = 12h 18m 53.63s\n Dec(J2000) = -58d 03' 13.9\"\nwith an uncertainty of 3.5 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 (4.94 x\n10^21 cm^-2, Willingale et al. 2013), with an excess column of 7.8\n(+3.75/-3.24) x 10^21 cm^-2 (90% confidence).\n\nThe initial flux in the 2.5 s image was 2.07e-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 155 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. Because of the density of catalogued stars, further\nanalysis is required to report an upper limit for any afterglow in the\nsub-image. Data from the list of sources generated on-board are not available\nat this time. No correction has been made for the large, but uncertain,\nextinction expected.\n\nBurst Advocate for this burst is N. J. Klingler (noelklin AT umbc.edu).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDk4NzY1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ANtaHSYMcV-ateNjJY04InqXz89A9227fqU1JRS-I3A\n\n",
"published": "2023-08-15T11:26:10.886652Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T11:26:10.886685Z",
"modified": "2023-08-15T11:26:10.898163Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2105,
"topic": "gcn.circular",
"uuid": "6e6d26fa-ebcb-4190-aab0-f799509a2b73",
"title": "GRB 230812B: Tautenburg observations",
"submitter": "Hop gcn.circular",
"authors": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"data": {
"date": "23/08/15 13:55:41 GMT",
"from": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"title": "GCN CIRCULAR",
"number": "34435",
"subject": "GRB 230812B: Tautenburg observations"
},
"message_text": "\nS. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, and F. Ludwig (all TLS Tautenburg) report:\n\nWe observed the field of GRB 230812B (Lesage et al., GCN 34387; Roberts et al., GCN 34391; Scotton et al., GCN 34392; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k CCD camera. Observations consisted of 3 x 90 sec exposures using the Sloan g, r, and i-band filter.\n\nFor the optical transient (first reported by Zheng et al., GCN 34395, and Lipunov et al, GCN 34396) we measure the following preliminary AB magnitudes (2.19 days post burst):\n\ng = 21.85 +/- 0.25 (midtime: August 14, 2023, 23:23:33 UT),\n\nr = 21.28 +/- 0.13 (midtime: August 14, 2023, 23:30:37 UT),\n\ni = 21.29 +/- 0.14 (midtime: August 14, 2023, 23:37:44 UT),\n\ncalibrated against SDSS stars in the field.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTA3NzQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Pu4B4nuDqMIoIsbuOQf8Ld575KrvHrPqiigzIIOlwts\n\n",
"published": "2023-08-15T13:55:51.488293Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T13:55:51.488311Z",
"modified": "2023-08-15T13:55:51.492327Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2106,
"topic": "gcn.circular",
"uuid": "cd609855-08ee-4165-952d-1d9bd8ccda37",
"title": "GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy",
"submitter": "Hop gcn.circular",
"authors": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
"data": {
"date": "23/08/15 14:09:22 GMT",
"from": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34436",
"subject": "GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy"
},
"message_text": "Giulio Scarfì (Iota Scorpii Observatory, La Spezia,Italy)\nmail terziaria@gmail.com\n\nIn a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\n\nMembers of:\n\nGAD - Gruppo Astronomia Digitale.\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.\n\nreport:\n\nI have observed the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN\n34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley\net al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN\n34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et\nal., GCN 34405; Moskvitin & Spiridonova GCN 34406; Leonini et al. GCN\n34408; de Ugarte Postigo et al. GCN 34409; de Ugarte Postigo et al.\nGCN 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks\net al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416;\nQuadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN\n34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423;\nPyshna et al., GCN 34425) with my 0.40-m Ritchey-Cretien telescope.\n\nThe observations started 1660 min after the GRB trigger, at the end of\ntwilight,\nwith a Ritchey Cretien D=406 mm with reducer F/D=6,15.\nWeather conditions were good.\n\n\nAdd 12 x 300 sec. unfiltered images on August 13 2023,\nfrom 20:26:35 to 21:21:42 UT\n\n\nStart T0+     End T0+      R lim\n1660 min       1735 min        20\n\n\nI confirm a fading afterglow\n\n\nThe results of photometry are:\n\n\n     JD        mag     Err  Flt\n\n2460170.36555307  19.85 +/- 0.2  CLEAR\n\n\nMagnitudes were estimated with the Atlas catalog and\nare not corrected for galactic dust extinction.\n\n\n\nReference:\nhttp://www.iotascorpiiobservatory.it\n\n\n\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTA4NTY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.R3WXyANGEKOSoTO7XEoqZ1yCw8yIBEcWu_eFIG1ITHc\n\n",
"published": "2023-08-15T14:09:33.651718Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T14:09:33.651735Z",
"modified": "2023-08-15T14:09:33.655941Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2107,
"topic": "gcn.circular",
"uuid": "6e8768e9-af5a-4168-a40a-7ed11ce9740c",
"title": "GRB 230815A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/15 16:44:53 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34437",
"subject": "GRB 230815A: 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 927 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 230815A, 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 = 184.72225, -58.05290 which is equivalent\nto:\n\nRA (J2000): 12h 18m 53.34s\nDec (J2000): -58d 03' 10.4\"\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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTE3ODk5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.qkzmvftMtJGL1qvp0elIVJ7rOcJftfj3ZWCvakobMgs\n\n",
"published": "2023-08-15T16:45:08.485052Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T16:45:08.485072Z",
"modified": "2023-08-15T16:45:08.490345Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2110,
"topic": "gcn.circular",
"uuid": "89f3b6a7-485f-4431-9200-6b0cbbc8e779",
"title": "GRB 230815A: Fermi GBM detection",
"submitter": "Hop gcn.circular",
"authors": "Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>",
"data": {
"date": "23/08/15 20:38:44 GMT",
"from": "Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34440",
"subject": "GRB 230815A: Fermi GBM detection"
},
"message_text": "B. Mailyan (Florida tech), A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 10:49:54.66 UT on 15 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230815A (trigger 713789399/230815451).\nwhich was also detected by Swift BAT (N. J. Klingler et al. 2023, GCN 34434).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 159 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 5.2 s (50-300 keV). The time-averaged spectrum\nfrom T0+0.002 to T0+3.264 s is best fit by\na Band function with Epeak = 235 +/- 25 keV,\nalpha = -0.6 +/- 0.1, and beta = -2.22 +/- 0.09.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.20 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.1 s in the 10-1000 keV band is 27 +/- 2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTMxOTMwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ie9B6VBVXiZZ8ZVdzCuOSMX-rbtZuL-uCq3slRFCDSg\n\n",
"published": "2023-08-15T20:38:54.850566Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T20:38:54.850584Z",
"modified": "2023-08-15T20:38:54.854648Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2111,
"topic": "gcn.circular",
"uuid": "0fe71dba-8d18-4c67-a789-a3ab6203a5cd",
"title": "GRB230815A: BOOTES-6/DPRT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/08/15 21:30:53 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34441",
"subject": "GRB230815A: BOOTES-6/DPRT optical upper limit"
},
"message_text": "E. Fernandez-Garcia, Y.-D. Hu, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, SouthAfrica), 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 230815A by Swift (Klingler et al. GCNC 34434) and Fermi (Mayland et al. GCNC 34440), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) automatically observed the GRB location starting on Aug. 15, 19:21 UT (~ 8.5 h after trigger). No new optical source is detected on the co-added image (5 x 60 s, clear filter) within the enhanced Swift/XRT error region (Beardmore et al. GCNC 34437) down to 19.5 mag.\n\nWe thank the staff at Boyden Observatory for their excellent support.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTM1MDU5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ik_0Q-5voO3uoZZEQdh8ToGm5LKoZR-j_JKF5JawJIE\n\n",
"published": "2023-08-15T21:31:04.815274Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T21:31:04.815307Z",
"modified": "2023-08-15T21:31:04.819474Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2112,
"topic": "gcn.circular",
"uuid": "68895683-4d3e-4448-84f8-f48ca8cecd08",
"title": "GRB 230812B: continued SAO RAS optical observation",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/16 01:28:09 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34442",
"subject": "GRB 230812B: continued SAO RAS optical observation"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS),\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 230812B (Fermi GBM Team, GCN 34386;\nScotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al.,\nGCN 34399; Casentini et al., GCN 34402) with the 1-m telescope\nof SAO RAS Zeiss-1000 equipped with the CCD photometer. We obtained\n8 x 300 sec. images in Rc band on 19:02:23--20:57:14 UT and\n8 x 300 sec. images in B band on 19:45:22--21:08:27 UT (August 15).\n\nThe OT (Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page,\nGCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396;\nSalgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al.,\nGCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403;\nMao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin & Spiridonova,\nGCN 34406; Leonini et al., GCN 34408; de Ugarte Postigo et al.,\nGCNs 24409, 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413;\nFrederiks et al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al.\nGCN 34416; Quadri et al. GCN 34417; Adami et al. GCN 34418;\nMoretti et al. GCN 34419; Kumar et al. GCN 34420; Belkin et al. GCNs\n34421, GCN 34423; Pyshna et al., GCN 34425; Moskvitin & Spiridonova,\nGCN 34428; Quadri & Strabla, GCN 34430; Mihov et al., GCN 34431;\nBelkin et al. GCN 34432; Klose et al., GCN 34435; Scarfi, GCN 34436)\nis clearly detected in our stacked frames with the brightness of\nR = 21.40 +/- 0.06 (t_mid - t0 = 3.0428 days),\nB = 22.23 +/- 0.09 (t_mid - t0 = 3.0616 days).\n\nThis preliminary photometry is based on the nearby SDSS stars;\nmagnitudes are converted using Lupton (2005) equations.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTQ5Mjk1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JDExFEQ5pSyWwQkJ7gYafQAIb73B9GYreSp82vW2NvU\n\n",
"published": "2023-08-16T01:28:19.842281Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T01:28:19.842299Z",
"modified": "2023-08-16T01:28:19.847109Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
