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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

5058 results found.

  1. GRB 220320A: AstroSat CZTI detection
  2. GRB 220319A: MITSuME Akeno optical upper limits
  3. GRB 220319A: Mondy optical uper limit
  4. GRB 220319A: MASTER Global Robotic Net optical observations
  5. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  6. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  7. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  8. GRB 220310A: MITSuME Akeno optical observation
  9. IceCube-220317A: MASTER Global Robotic Net optical observations
  10. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  11. GRB 220315A: MASTER Global Robotic Net optical observations
  12. GRB 220311A: MITSuME Akeno optical upper limits
  13. GRB 220310A: K-800 of Terskol observatory optical upper limit
  14. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  15. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  16. Integral GRB220311.69: Global MASTER-Net observations report
  17. Integral GRB220311.69: Global MASTER-Net observations report
  18. Integral GRB220311.69: Global MASTER-Net OT detection
  19. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  20. GRB 220306B: Nanshan/NEXT optical upper limit
  21. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  22. Fermi GBM Detection of GRB 220308A
  23. GRB 220308A: AGILE detection
  24. GRB 220310A: MASTER optical counterpart detection
  25. Fermi GRB 220310B: Global MASTER-Net observations report
  26. GRB 220310A: MAXI/GSC detection
  27. MAXI GRB220310.02: Global MASTER-Net observations report
  28. IceCube-220306A: No significant detection in HAWC
  29. IceCube-220303A: No significant detection in HAWC
  30. Fermi GRB 220309A: Global MASTER-Net observations report
  31. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  32. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  33. Fermi trigger No 668410535: Global MASTER-Net observations report
  34. GRB 220306B: Tautenburg observations
  35. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  36. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  37. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  38. GRB 220306B: AbAO optical observations, possible afterglow candidate
  39. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  40. Swift GRB 220306B: Global MASTER-Net observations report
  41. Fermi GRB 220306A: Global MASTER-Net observations report
  42. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  43. Fermi GRB 220305A: Global MASTER-Net observations report
  44. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  45. Swift GRB 220305A: Global MASTER-Net observations report
  46. GRB 220305A: Swift-XRT observations
  47. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  48. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  49. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  50. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  51. IceCube Alert 220304.74: Global MASTER-Net observations report
  52. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  53. Fermi GRB 220304A: Global MASTER-Net observations report
  54. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  55. IceCube Alert 220303.75: Global MASTER-Net observations report
  56. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  57. Swift GRB 220302A: Global MASTER-Net observations report
  58. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  59. ZTF22aaajecp/AT2022cmc: DECam Photometry
  60. GRB 220219B: Swift-XRT observations
  61. Fermi GRB 220223A: Global MASTER-Net observations report
  62. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  63. Fermi GRB 220222A: Global MASTER-Net observations report
  64. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  65. IceCube Alert 220220.60: Global MASTER-Net observations report
  66. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  67. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  68. Fermi trigger No 666489765: Global MASTER-Net observations report
  69. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  70. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  71. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  72. GRB 220128A: AstroSat CZTI detection
  73. Konus-Wind detection of GRB 220128A
  74. IPN triangulation of GRB 220128A (long)
  75. Konus-Wind detection of GRB 220124A
  76. IPN triangulation of GRB 220124A
  77. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  78. IPN triangulation of a bright burst from SGR 1935+2154
  79. IPN triangulation of GRB 211226A
  80. GRB 220118A: MITSuME Akeno optical observation
  81. IceCube-220115A: Upper limits from a search for additional neutrino events in IceCube
  82. Fermi trigger No 663966693: Global MASTER-Net observations report
  83. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  84. GECAM observations of a series of bursts from SGR J1935+2154
  85. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  86. Fermi trigger No 663658976: Global MASTER-Net observations report
  87. Fermi GRB 220111A: Global MASTER-Net observations report
  88. GRB 220107A: SAO RAS optical observations
  89. GRB 220101A: Additional Liverpool telescope photometry
  90. GRB 220107A: SAO RAS optical observations
  91. Fermi GRB 220107A: Global MASTER-Net observations report
  92. Fermi trigger No 663129379: Global MASTER-Net observations report
  93. GRB 220101A: LCO Continued Optical Observations
  94. Fermi GRB 220103A: Global MASTER-Net observations report
  95. GRB 220103A: Fermi GBM Final Real-time Localization
  96. Alert from the HAWC Burst Monitor HAWC-220103A
  97. GRB 220101A: LCO Optical Observations
  98. GRB 220101A: Asiago spectroscopic and photometric detection
  99. GRB 211229A: Fermi GBM observation
  100. Fermi GRB 211229A: Global MASTER-Net observations report

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