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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

5556 results found.

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

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