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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"

22207 results found.

  1. GRB 220315A: MASTER Global Robotic Net optical observations
  2. GRB 220306B: Swift/UVOT Upper Limits
  3. GRB 210722A: TAROT Reunion observatory optical light curve
  4. GRB 210222B: TAROT Reunion observatory optical light curve
  5. GRB 201021C: TAROT Reunion observatory optical light curve
  6. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  7. GRB 220310C: Swift-XRT observations
  8. Konus-Wind detection of GRB 220310A
  9. GRB 220310C: Swift ToO observations
  10. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  11. Integral GRB220311.69: Global MASTER-Net observations report
  12. Integral GRB220311.69: Global MASTER-Net observations report
  13. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  14. GRB 220310A: GIT confirmation of optical afterglow.
  15. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  16. GRB 220310A: MASTER optical counterpart detection
  17. GRB 220310A: Swift ToO observations
  18. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  19. Fermi GRB 220310B: Global MASTER-Net observations report
  20. MAXI GRB220310.02: Global MASTER-Net observations report
  21. Konus-Wind detection of GRB 220308A
  22. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  23. Fermi GRB 220309A: Global MASTER-Net observations report
  24. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  25. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  26. Fermi trigger No 668410535: Global MASTER-Net observations report
  27. GRB 220306B: Tautenburg observations
  28. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  29. GRB 220306B: AbAO optical observations, possible afterglow candidate
  30. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  31. Swift GRB 220306B: Global MASTER-Net observations report
  32. Fermi GRB 220306A: Global MASTER-Net observations report
  33. Fermi GRB 220305A: Global MASTER-Net observations report
  34. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  35. Swift GRB 220305A: Global MASTER-Net observations report
  36. GRB 220305A: Swift-XRT observations
  37. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  38. GRB 220302A: Swift/UVOT Upper Limits
  39. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  40. IceCube Alert 220304.74: Global MASTER-Net observations report
  41. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  42. Fermi GRB 220304A: Global MASTER-Net observations report
  43. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  44. IceCube Alert 220303.75: Global MASTER-Net observations report
  45. Swift resumes autonomous slewing
  46. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  47. ZTF22aaajecp/AT2022cmc: ATCA detection
  48. Swift GRB 220302A: Global MASTER-Net observations report
  49. GRB 220302A: Swift detection of a burst
  50. Fermi trigger No 667737010: Global MASTER-Net observations report
  51. ZTF22aaajecp/AT2022cmc: JCMT SCUBA-2 sub-mm observations
  52. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  53. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  54. IceCube Alert 220225.59: Global MASTER-Net observations report
  55. GRB 220101A: The first example of a Petanova
  56. ZTF22aaajecp/AT2022cmc: DECam Photometry
  57. GRB 220219B: Swift-XRT observations
  58. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  59. Fermi GRB 220223A: Global MASTER-Net observations report
  60. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  61. Fermi GRB 220222B: Global MASTER-Net observations report
  62. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  63. GRB 220219B: Swift ToO observations
  64. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  65. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  66. Fermi GRB 220222A: Global MASTER-Net observations report
  67. ZTF22aabjpxh/AT2022cva: Assy optical observations
  68. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  69. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  70. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  71. IceCube Alert 220221.03: Global MASTER-Net observations report
  72. Konus-Wind observation of GRB 220219A
  73. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  74. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  75. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  76. IceCube Alert 220220.60: Global MASTER-Net observations report
  77. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  78. Fermi trigger No 666962499: Global MASTER-Net observations report
  79. GRB 220218A: Swift detection of a burst
  80. Swift GRB220218.94: Global MASTER-Net observations report
  81. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  82. Konus-Wind detection of GRB 220209A
  83. Swift resumes pointed science observations
  84. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  85. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  86. ZTF22aaajecp: GIT optical follow-up observations
  87. GRB 211023A: evidence of supernova in LBT spectra
  88. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  89. ZTF22aaajecp/AT2022cmc: VLA radio detection
  90. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  91. Fermi trigger No 666489765: Global MASTER-Net observations report
  92. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  93. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  94. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  95. Fermi GRB 220211B: Global MASTER-Net observations report
  96. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  97. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  98. GRB 220210A: Swift/BAT-GUANO localization
  99. Fermi GRB 220211A: Global MASTER-Net observations report
  100. Fermi GRB 220210A: Global MASTER-Net observations report

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