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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"

32720 results found.

  1. Konus-Wind detection of GRB 220627A
  2. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  3. GRB 220627A: VLT MUSE redshift
  4. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  5. GRB 220627A: MeerLICHT candidate optical afterglow
  6. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  7. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  8. Konus-Wind detection of GRB 220624A
  9. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  10. GRB 220627A: Swift ToO observations
  11. GRB 220627A: Fermi-LAT detection
  12. GRB 220627A: MeerLICHT detection of two afterglow candidates
  13. Fermi GRB 220627A: Global MASTER-Net observations report
  14. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  15. IceCube-220624A: No significant detection in HAWC
  16. GRB 220623A: GIT optical upper limits.
  17. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  18. GRB 220623A: T193-OHP optical upper limit
  19. IceCube-220624A: No Candidate Counterparts from the Zwicky Transient Facility
  20. GRB 220624A: Fermi GBM Detection
  21. Fermi GRB 220623B: Global MASTER-Net observations report
  22. Fermi GRB 220624A: Global MASTER-Net observations report
  23. IPN triangulation of GRB 220624A
  24. GRB 220623A: Swift-BAT refined analysis
  25. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  27. GRB 220624A: AGILE/GRID analysis
  28. GRB 220624A: AGILE detection
  29. Konus-Wind detection of GRB 220623A
  30. GRB 220623A: AbAO optical upper limit
  31. GRB 220623A: Swift-XRT refined Analysis
  32. GRB 220623A: NOT optical observations
  33. GRB 220623A: Swift/UVOT Upper Limits
  34. Konus-Wind detection of GRB 220609B
  35. GRB 220623A: AGILE detection
  36. GRB 220623A: AstroSat CZTI detection
  37. GRB 220623A: iTelescope optical upper limit
  38. GRB 220618A: Fermi GBM detection
  39. Swift Detection of MAXI J0655-013
  40. GRB 220618A: Swift-BAT refined analysis
  41. GRB 220618A: iTelescope T-19 upper limit
  42. Konus-Wind detection of GRB 220617A
  43. Fermi GRB 220620B: Global MASTER-Net observations report
  44. Fermi GRB 220620A: Global MASTER-Net observations report
  45. GRB 220611A: Continued Gemini Infrared Observations
  46. GRB 220617A: TNG optical observations
  47. GRB 220617A: Fermi GBM observation
  48. GRB 220611A optical counterpart
  49. GRB 220618A: Swift-XRT refined Analysis
  50. IPN triangulation of GRB 220617A (short)
  51. GRB 220618A: Swift/UVOT Upper Limits
  52. GRB220611A: Gemini Optical Afterglow Confirmation
  53. GRB 220617A: Swift-XRT observations
  54. GRB 220617A: Fermi-LAT detection
  55. GRB 220617B: Swift ToO observations
  56. Fermi GRB 220617A: Global MASTER-Net observations report
  57. GRB 220611A: Gemini Ks counterpart detection
  58. Konus-Wind detection of GRB 220613A
  59. IPN triangulation of GRB 220613A
  60. GRB 220611A: Gemini South Infrared Detection
  61. IPN triangulation of GRB 220606C
  62. GRB 220611A: Swift/UVOT Upper Limits
  63. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 220611A: Swift-BAT refined analysis
  65. Swift GRB 220611A: Global MASTER-Net observations report
  66. GRB 220611A: Swift-XRT refined Analysis
  67. IPN triangulation of GRB 220609B
  68. Fermi GRB 220610A: Global MASTER-Net observations report
  69. GRB 220609B: AstroSat CZTI detection
  70. GRB 220608A: AstroSat CZTI detection
  71. GRB 220606A: Fermi GBM observation
  72. Fermi GRB 220608A: Global MASTER-Net observations report
  73. GRB 220606B: Gemini South Optical Observations
  74. GRB 220606B: Fermi GBM Observation
  75. GRB 220606B: Swift follow-up observations
  76. Konus-Wind detection of GRB 220601A
  77. GRB 220606A: Swift/BAT-GUANO detection
  78. GRB 220606B: GUANO coordinate correction to GCN 32167
  79. GRB 220527A: A BdHN I with a clear UPE phase
  80. GRB 220606B: Swift ToO observations
  81. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  82. Fermi GRB 220606B: Global MASTER-Net observations report
  83. IPN triangulation of GRB 220601A (long)
  84. Fermi-GBM will trial new SAA regions from Tuesday June 7th
  85. GRB 220527A: MITSuME Akeno continued optical observation
  86. GRB 220527A: Lick 3m Optical Observations
  87. Konus-Wind detection of GRB 220528A
  88. IPN triangulation of GRB 220528A (short)
  89. GRB 220528A: Fermi GBM Observation
  90. Fermi GRB 220530A: Global MASTER-Net observations report
  91. Konus-Wind observation of GRB 220527A
  92. Correction to GCN 32148: Should be GRB 220528A
  93. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  94. GRB 220527A: AST3-3 Yaoan Optical Observation
  95. GRB 220527A: REM optical/NIR observations
  96. GRB 220527A: VLT/X-shooter spectroscopic redshift
  97. GRB 220527A: MeerLICHT afterglow observations
  98. GRB 220527A: NOT optical photometry and spectroscopic redshift
  99. GRB 220527A: AstroSat CZTI detection
  100. GRB 220527A: CALET Gamma-Ray Burst Monitor detection

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