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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"

22212 results found.

  1. GRB220319A: Optical observations from NOT
  2. GRB 220319A: MASTER Global Robotic Net optical observations
  3. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  4. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  5. IceCube-220317A: MASTER Global Robotic Net optical observations
  6. GRB 220315A: MASTER Global Robotic Net optical observations
  7. GRB 220306B: Swift/UVOT Upper Limits
  8. GRB 210722A: TAROT Reunion observatory optical light curve
  9. GRB 210222B: TAROT Reunion observatory optical light curve
  10. GRB 201021C: TAROT Reunion observatory optical light curve
  11. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  12. GRB 220310C: Swift-XRT observations
  13. Konus-Wind detection of GRB 220310A
  14. GRB 220310C: Swift ToO observations
  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. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  19. GRB 220310A: GIT confirmation of optical afterglow.
  20. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  21. GRB 220310A: MASTER optical counterpart detection
  22. GRB 220310A: Swift ToO observations
  23. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  24. Fermi GRB 220310B: Global MASTER-Net observations report
  25. MAXI GRB220310.02: Global MASTER-Net observations report
  26. Konus-Wind detection of GRB 220308A
  27. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  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. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  34. GRB 220306B: AbAO optical observations, possible afterglow candidate
  35. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  36. Swift GRB 220306B: Global MASTER-Net observations report
  37. Fermi GRB 220306A: Global MASTER-Net observations report
  38. Fermi GRB 220305A: Global MASTER-Net observations report
  39. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  40. Swift GRB 220305A: Global MASTER-Net observations report
  41. GRB 220305A: Swift-XRT observations
  42. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  43. GRB 220302A: Swift/UVOT Upper Limits
  44. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  45. IceCube Alert 220304.74: Global MASTER-Net observations report
  46. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  47. Fermi GRB 220304A: Global MASTER-Net observations report
  48. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  49. IceCube Alert 220303.75: Global MASTER-Net observations report
  50. Swift resumes autonomous slewing
  51. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  52. ZTF22aaajecp/AT2022cmc: ATCA detection
  53. Swift GRB 220302A: Global MASTER-Net observations report
  54. GRB 220302A: Swift detection of a burst
  55. Fermi trigger No 667737010: Global MASTER-Net observations report
  56. ZTF22aaajecp/AT2022cmc: JCMT SCUBA-2 sub-mm observations
  57. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  58. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  59. IceCube Alert 220225.59: Global MASTER-Net observations report
  60. GRB 220101A: The first example of a Petanova
  61. ZTF22aaajecp/AT2022cmc: DECam Photometry
  62. GRB 220219B: Swift-XRT observations
  63. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  64. Fermi GRB 220223A: Global MASTER-Net observations report
  65. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  66. Fermi GRB 220222B: Global MASTER-Net observations report
  67. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  68. GRB 220219B: Swift ToO observations
  69. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  70. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  71. Fermi GRB 220222A: Global MASTER-Net observations report
  72. ZTF22aabjpxh/AT2022cva: Assy optical observations
  73. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  74. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  75. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  76. IceCube Alert 220221.03: Global MASTER-Net observations report
  77. Konus-Wind observation of GRB 220219A
  78. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  79. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  80. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  81. IceCube Alert 220220.60: Global MASTER-Net observations report
  82. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  83. Fermi trigger No 666962499: Global MASTER-Net observations report
  84. GRB 220218A: Swift detection of a burst
  85. Swift GRB220218.94: Global MASTER-Net observations report
  86. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  87. Konus-Wind detection of GRB 220209A
  88. Swift resumes pointed science observations
  89. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  90. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  91. ZTF22aaajecp: GIT optical follow-up observations
  92. GRB 211023A: evidence of supernova in LBT spectra
  93. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  94. ZTF22aaajecp/AT2022cmc: VLA radio detection
  95. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  96. Fermi trigger No 666489765: Global MASTER-Net observations report
  97. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  98. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  99. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  100. Fermi GRB 220211B: Global MASTER-Net observations report

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