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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"

19663 results found.

  1. GRB 220618A: Swift-XRT refined Analysis
  2. IPN triangulation of GRB 220617A (short)
  3. GRB 220618A: BOOTES-5/JGT early optical upper limit
  4. GRB 220618A: Swift/UVOT Upper Limits
  5. GRB 220618A: Enhanced Swift-XRT position
  6. GRB 220617A: Swift-XRT observations
  7. GRB 220618A: Swift detection of a burst
  8. Swift GRB220618.38: Global MASTER-Net observations report
  9. GRB 220617A: Fermi-LAT detection
  10. GRB 220617B: Swift ToO observations
  11. GRB 220611A: Swift/UVOT Upper Limits
  12. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  13. GRB 220612A: Swift/BAT-GUANO detection
  14. GRB 220611A: Swift-BAT refined analysis
  15. Swift GRB 220611A: Global MASTER-Net observations report
  16. GRB 220611A: Swift-XRT refined Analysis
  17. GRB 220611A: Enhanced Swift-XRT position
  18. GRB 220611A: Swift detection of a burst
  19. GRB 220606A: Fermi GBM observation
  20. GRB 220606B: Gemini South Optical Observations
  21. GRB 220606B: Fermi GBM Observation
  22. GRB 220606B: Swift follow-up observations
  23. GRB 220606A: Swift/BAT-GUANO detection
  24. GRB 220606B: GUANO coordinate correction to GCN 32167
  25. GRB 220527A: A BdHN I with a clear UPE phase
  26. GRB 220606B: Swift ToO observations
  27. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  28. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  29. GRB 220527A: MITSuME Akeno continued optical observation
  30. Konus-Wind detection of GRB 220528A
  31. IPN triangulation of GRB 220528A (short)
  32. GRB 220528A: Fermi GBM Observation
  33. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  34. Swift trigger 1108515 is not an astrophysical event
  35. Correction to GCN 32148: Should be GRB 220528A
  36. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  37. GRB 220527A: AST3-3 Yaoan Optical Observation
  38. GRB 220527A: VLT/X-shooter spectroscopic redshift
  39. GRB 220527A: AstroSat CZTI detection
  40. GRB 220527A: MITSuME Akeno optical observation
  41. GRB 220527A: Swift/UVOT detection
  42. GRB 220527A: Swift-XRT afterglow detection
  43. Swift trigger 1108208 is not an interesting astrophysical event.
  44. GRB 220527A: Swift ToO observations
  45. Swift GRB220526.48: Global MASTER-Net observations report
  46. IPN triangulation of GRB 220524A
  47. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  48. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  49. GRB 220521A: MMT Afterglow Imaging
  50. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  51. GRB 220521A: Swift-BAT refined analysis
  52. GRB 220521A: Fermi GBM detection
  53. GRB 220521A: RATIR Optical and NIR Observations
  54. GRB 220521A: Swift-XRT refined Analysis
  55. GRB 220521A: Swift/UVOT Upper Limits
  56. GRB 220521A: Enhanced Swift-XRT position
  57. GRB 220521A: Prompt enhanced Swift-XRT position
  58. GRB 220521A: Swift detection of a burst
  59. Swift GRB220521.97: Global MASTER-Net observations report
  60. Swift BAT Trigger 1107209 is not an astrophysical event
  61. GRB 220518A: Swift-BAT refined analysis
  62. Swift GRB220519.84: Global MASTER-Net observations report
  63. GRB 220518A: Swift-XRT refined Analysis
  64. GRB 220518A: Swift/UVOT Detection
  65. GRB 220518A: Enhanced Swift-XRT position
  66. Swift GRB 220518A: Global MASTER-Net observations report
  67. GRB 220518A: Swift detection of a burst
  68. GRB 220514B: Swift-XRT observations
  69. GRB 220511A: Swift-XRT afterglow detection
  70. GRB 220514B: Tiled Swift observations
  71. GRB 220427A: MeerLICHT afterglow observations
  72. GRB 220511A: Fermi GBM observation
  73. GRB 220511A: Swift-XRT observations
  74. GRB 220511A: AstroSat CZTI detection
  75. GRB 220511A: BOOTES-2/TELMA optical upper limit
  76. GRB 220511A: Swift ToO observations
  77. GRB 220511A: Swift/BAT-GUANO arcminute localization
  78. GRB 220506A: GIT optical upper limit.
  79. GRB 220506A: BOOTES-5/JGT optical upper limit
  80. GRB 220506A: Swift-XRT afterglow detection
  81. GRB 220506A: Tiled Swift observations
  82. Swift-BAT triggers 1105560-1 are not GRBs
  83. Swift GRB220506.51: Global MASTER-Net observations report
  84. GRB 220430A: Nanshan/NEXT optical upper limit
  85. GRB 220430A: Nanshan/HMT optical upper limit
  86. GRB 220430A: GIT optical upper limits
  87. IPN triangulation of GRB 220423A
  88. GRB 220427A: LCO Optical Observations
  89. GRB 220501A: Swift-BAT refined analysis
  90. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  91. GRB 220501A: BOOTES-1 optical upper limit
  92. GRB 220501A: Fermi GBM observation
  93. GRB 220430A: AstroSat CZTI detection
  94. GRB 220501A: Swift detection of a burst
  95. GRB 220430A: Swift-BAT refined analysis
  96. GRB 220430A: CAHA 2.2m telescope optical limit
  97. GRB 220430A: Swift-XRT refined Analysis
  98. Swift GRB 220430A: Global MASTER-Net observations report
  99. GRB 220430A: GRANDMA observations
  100. GRB 220430A: Mondy and AbAO optical upper limits

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