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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"

21525 results found.

  1. Swift GRB 220611A: Global MASTER-Net observations report
  2. GRB 220611A: Swift-XRT refined Analysis
  3. GRB 220611A: Enhanced Swift-XRT position
  4. GRB 220611A: Swift detection of a burst
  5. GRB 220606A: Fermi GBM observation
  6. GRB 220606B: Gemini South Optical Observations
  7. GRB 220606B: Fermi GBM Observation
  8. GRB 220606B: Swift follow-up observations
  9. GRB 220606A: Swift/BAT-GUANO detection
  10. GRB 220606B: GUANO coordinate correction to GCN 32167
  11. GRB 220527A: A BdHN I with a clear UPE phase
  12. GRB 220606B: Swift ToO observations
  13. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  14. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220527A: MITSuME Akeno continued optical observation
  16. Konus-Wind detection of GRB 220528A
  17. IPN triangulation of GRB 220528A (short)
  18. GRB 220528A: Fermi GBM Observation
  19. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  20. Swift trigger 1108515 is not an astrophysical event
  21. Correction to GCN 32148: Should be GRB 220528A
  22. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  23. GRB 220527A: AST3-3 Yaoan Optical Observation
  24. GRB 220527A: VLT/X-shooter spectroscopic redshift
  25. GRB 220527A: AstroSat CZTI detection
  26. GRB 220527A: MITSuME Akeno optical observation
  27. GRB 220527A: Swift/UVOT detection
  28. GRB 220527A: Swift-XRT afterglow detection
  29. Swift trigger 1108208 is not an interesting astrophysical event.
  30. GRB 220527A: Swift ToO observations
  31. Swift GRB220526.48: Global MASTER-Net observations report
  32. IPN triangulation of GRB 220524A
  33. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  34. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  35. GRB 220521A: MMT Afterglow Imaging
  36. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  37. GRB 220521A: Swift-BAT refined analysis
  38. GRB 220521A: Fermi GBM detection
  39. GRB 220521A: RATIR Optical and NIR Observations
  40. GRB 220521A: Swift-XRT refined Analysis
  41. GRB 220521A: Swift/UVOT Upper Limits
  42. GRB 220521A: Enhanced Swift-XRT position
  43. GRB 220521A: Prompt enhanced Swift-XRT position
  44. GRB 220521A: Swift detection of a burst
  45. Swift GRB220521.97: Global MASTER-Net observations report
  46. Swift BAT Trigger 1107209 is not an astrophysical event
  47. GRB 220518A: Swift-BAT refined analysis
  48. Swift GRB220519.84: Global MASTER-Net observations report
  49. GRB 220518A: Swift-XRT refined Analysis
  50. GRB 220518A: Swift/UVOT Detection
  51. GRB 220518A: Enhanced Swift-XRT position
  52. Swift GRB 220518A: Global MASTER-Net observations report
  53. GRB 220518A: Swift detection of a burst
  54. GRB 220514B: Swift-XRT observations
  55. GRB 220511A: Swift-XRT afterglow detection
  56. GRB 220514B: Tiled Swift observations
  57. GRB 220427A: MeerLICHT afterglow observations
  58. GRB 220511A: Fermi GBM observation
  59. GRB 220511A: Swift-XRT observations
  60. GRB 220511A: AstroSat CZTI detection
  61. GRB 220511A: BOOTES-2/TELMA optical upper limit
  62. GRB 220511A: Swift ToO observations
  63. GRB 220511A: Swift/BAT-GUANO arcminute localization
  64. GRB 220506A: MITSuME Akeno optical upper limits
  65. GRB 220506A: GIT optical upper limit.
  66. GRB 220506A: BOOTES-5/JGT optical upper limit
  67. GRB 220506A: Swift-XRT afterglow detection
  68. GRB 220506A: Tiled Swift observations
  69. Swift-BAT triggers 1105560-1 are not GRBs
  70. Swift GRB220506.51: Global MASTER-Net observations report
  71. GRB 220430A: Nanshan/NEXT optical upper limit
  72. GRB 220430A: Nanshan/HMT optical upper limit
  73. GRB 220430A: GIT optical upper limits
  74. IPN triangulation of GRB 220423A
  75. GRB 220427A: LCO Optical Observations
  76. GRB 220501A: Swift-BAT refined analysis
  77. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  78. GRB 220501A: BOOTES-1 optical upper limit
  79. GRB 220501A: Fermi GBM observation
  80. GRB 220430A: AstroSat CZTI detection
  81. GRB 220501A: Swift detection of a burst
  82. GRB 220430A: Swift-BAT refined analysis
  83. GRB 220430A: CAHA 2.2m telescope optical limit
  84. GRB 220430A: Swift-XRT refined Analysis
  85. Swift GRB 220430A: Global MASTER-Net observations report
  86. GRB 220430A: GRANDMA observations
  87. GRB 220430A: Mondy and AbAO optical upper limits
  88. GRB 220430A: AGILE detection
  89. GRB 220430A: MeerLICHT optical upper limits
  90. GRB 220430A: Enhanced Swift-XRT position
  91. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  92. GRB 220427A: Swift-BAT refined analysis
  93. GRB 220426A: Swift-XRT and UVOT observations
  94. GRB 220423A: Detection by VZLUSAT-2
  95. Konus-Wind detection of GRB 220427A
  96. GRB 220427A: Swift-XRT refined Analysis
  97. GRB 220427A: Enhanced Swift-XRT position
  98. GRB 220426A: Tiled Swift observations
  99. GRB 220427A: Swift detection of a burst with an optical counterpart
  100. Konus-Wind detection of GRB 220426A

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