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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"

21470 results found.

  1. GRB 220627A: Swift ToO observations
  2. GRB 220627A: Fermi-LAT detection
  3. GRB 220623A: GIT optical upper limits.
  4. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 220623A: T193-OHP optical upper limit
  6. GRB 220624A: Fermi GBM Detection
  7. IPN triangulation of GRB 220624A
  8. GRB 220623A: Swift-BAT refined analysis
  9. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  10. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  11. Konus-Wind detection of GRB 220623A
  12. GRB 220623A: AbAO optical upper limit
  13. GRB 220623A: Swift-XRT refined Analysis
  14. GRB 220623A: NOT optical observations
  15. GRB 220623A: Swift/UVOT Upper Limits
  16. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  17. GRB 220623A: Enhanced Swift-XRT position
  18. GRB 220623A: AGILE detection
  19. GRB 220623A: AstroSat CZTI detection
  20. GRB 220623A: iTelescope optical upper limit
  21. GRB 220623A: Swift-XRT observations
  22. GRB 220623A: Swift detection of a burst
  23. GRB 220618A: Fermi GBM detection
  24. Swift Detection of MAXI J0655-013
  25. GRB 220618A: Swift-BAT refined analysis
  26. GRB 220618A: iTelescope T-19 upper limit
  27. Swift GRB220620.02: Global MASTER-Net observations report
  28. GRB 220611A: Continued Gemini Infrared Observations
  29. GRB 220617A: TNG optical observations
  30. Swift Trigger 1110865 is probably not an astrophysical event
  31. GRB 220618A: Swift-XRT refined Analysis
  32. IPN triangulation of GRB 220617A (short)
  33. GRB 220618A: BOOTES-5/JGT early optical upper limit
  34. GRB 220618A: Swift/UVOT Upper Limits
  35. GRB 220618A: Enhanced Swift-XRT position
  36. GRB 220617A: Swift-XRT observations
  37. GRB 220618A: Swift detection of a burst
  38. Swift GRB220618.38: Global MASTER-Net observations report
  39. GRB 220617A: Fermi-LAT detection
  40. GRB 220617B: Swift ToO observations
  41. GRB 220611A: Gemini South Infrared Detection
  42. GRB 220611A: Swift/UVOT Upper Limits
  43. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  44. GRB 220612A: Swift/BAT-GUANO detection
  45. GRB 220611A: Swift-BAT refined analysis
  46. Swift GRB 220611A: Global MASTER-Net observations report
  47. GRB 220611A: Swift-XRT refined Analysis
  48. GRB 220611A: Enhanced Swift-XRT position
  49. GRB 220611A: Swift detection of a burst
  50. GRB 220606A: Fermi GBM observation
  51. GRB 220606B: Gemini South Optical Observations
  52. GRB 220606B: Fermi GBM Observation
  53. GRB 220606B: Swift follow-up observations
  54. GRB 220606A: Swift/BAT-GUANO detection
  55. GRB 220606B: GUANO coordinate correction to GCN 32167
  56. GRB 220527A: A BdHN I with a clear UPE phase
  57. GRB 220606B: Swift ToO observations
  58. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  59. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  60. GRB 220527A: MITSuME Akeno continued optical observation
  61. Konus-Wind detection of GRB 220528A
  62. IPN triangulation of GRB 220528A (short)
  63. GRB 220528A: Fermi GBM Observation
  64. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  65. Swift trigger 1108515 is not an astrophysical event
  66. Correction to GCN 32148: Should be GRB 220528A
  67. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  68. GRB 220527A: AST3-3 Yaoan Optical Observation
  69. GRB 220527A: VLT/X-shooter spectroscopic redshift
  70. GRB 220527A: AstroSat CZTI detection
  71. GRB 220527A: MITSuME Akeno optical observation
  72. GRB 220527A: Swift/UVOT detection
  73. GRB 220527A: Swift-XRT afterglow detection
  74. Swift trigger 1108208 is not an interesting astrophysical event.
  75. GRB 220527A: Swift ToO observations
  76. Swift GRB220526.48: Global MASTER-Net observations report
  77. IPN triangulation of GRB 220524A
  78. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  79. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  80. GRB 220521A: MMT Afterglow Imaging
  81. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  82. GRB 220521A: Swift-BAT refined analysis
  83. GRB 220521A: Fermi GBM detection
  84. GRB 220521A: RATIR Optical and NIR Observations
  85. GRB 220521A: Swift-XRT refined Analysis
  86. GRB 220521A: Swift/UVOT Upper Limits
  87. GRB 220521A: Enhanced Swift-XRT position
  88. GRB 220521A: Prompt enhanced Swift-XRT position
  89. GRB 220521A: Swift detection of a burst
  90. Swift GRB220521.97: Global MASTER-Net observations report
  91. Swift BAT Trigger 1107209 is not an astrophysical event
  92. GRB 220518A: Swift-BAT refined analysis
  93. Swift GRB220519.84: Global MASTER-Net observations report
  94. GRB 220518A: Swift-XRT refined Analysis
  95. GRB 220518A: Swift/UVOT Detection
  96. GRB 220518A: Enhanced Swift-XRT position
  97. Swift GRB 220518A: Global MASTER-Net observations report
  98. GRB 220518A: Swift detection of a burst
  99. GRB 220514B: Swift-XRT observations
  100. GRB 220511A: Swift-XRT afterglow detection

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