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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"

27921 results found.

  1. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  2. Konus-Wind detection of GRB 220609B
  3. GRB 220623B: Fermi GBM Final Real-time Localization
  4. GRB 220623A: Enhanced Swift-XRT position
  5. GRB 220623A: AGILE detection
  6. GRB 220623A: AstroSat CZTI detection
  7. GRB 220623A: Swift-XRT observations
  8. GRB 220623A: Swift detection of a burst
  9. GRB 220618A: Fermi GBM detection
  10. Swift Detection of MAXI J0655-013
  11. GRB 220618A: Swift-BAT refined analysis
  12. GRB 220618A: iTelescope T-19 upper limit
  13. Konus-Wind detection of GRB 220617A
  14. GRB 220620B: Fermi GBM Final Real-time Localization
  15. GRB 220619A: AstroSat CZTI detection
  16. Swift GRB220620.02: Global MASTER-Net observations report
  17. GRB 220620A: Fermi GBM Final Real-time Localization
  18. GRB 220611A: Continued Gemini Infrared Observations
  19. GRB 220617A: TNG optical observations
  20. Swift Trigger 1110865 is probably not an astrophysical event
  21. GRB 220611A optical counterpart
  22. GRB 220618A: Swift-XRT refined Analysis
  23. IPN triangulation of GRB 220617A (short)
  24. GRB 220618A: BOOTES-5/JGT early optical upper limit
  25. GRB 220618A: Swift/UVOT Upper Limits
  26. GRB 220618A: Enhanced Swift-XRT position
  27. GRB 220617A: Swift-XRT observations
  28. GRB 220618A: Swift detection of a burst
  29. Swift GRB220618.38: Global MASTER-Net observations report
  30. GRB 220617A: Fermi-LAT detection
  31. GRB 220617B: Swift ToO observations
  32. GRB 220617A: Fermi GBM Final Real-time Localization
  33. GRB 220611A: Gemini Ks counterpart detection
  34. Konus-Wind detection of GRB 220613A
  35. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  36. GRB 220611A: Gemini South Infrared Detection
  37. IPN triangulation of GRB 220606C
  38. GRB 220611A: Swift/UVOT Upper Limits
  39. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  40. GRB 220612A: Swift/BAT-GUANO detection
  41. GRB 220611A: Swift-BAT refined analysis
  42. GRB 220608B: Detection by VZLUSAT-2
  43. Swift GRB 220611A: Global MASTER-Net observations report
  44. GRB 220611A: Swift-XRT refined Analysis
  45. GRB 220610B: AstroSat CZTI detection
  46. GRB 220611A: Enhanced Swift-XRT position
  47. GRB 220611A: Swift detection of a burst
  48. IPN triangulation of GRB 220609B
  49. GRB 220610A: Fermi GBM Final Real-time Localization
  50. GRB 220609B: AstroSat CZTI detection
  51. GRB 220609B: CALET Gamma-Ray Burst Monitor detection
  52. GRB 220608A: AstroSat CZTI detection
  53. GRB 220609A: Fermi GBM Final Real-time Localization
  54. GRB 220606A: Fermi GBM observation
  55. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  56. GRB 220608A: Fermi GBM Final Real-time Localization
  57. GRB 220606B: Gemini South Optical Observations
  58. GRB 220606B: Fermi GBM Observation
  59. GRB 220606B: Swift follow-up observations
  60. Konus-Wind detection of GRB 220601A
  61. GRB 220606A: Swift/BAT-GUANO detection
  62. GRB 220606B: GUANO coordinate correction to GCN 32167
  63. GRB 220527A: A BdHN I with a clear UPE phase
  64. GRB 220606B: Swift ToO observations
  65. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  66. GRB 220606B: Fermi GBM Final Real-time Localization
  67. GRB 220606A: Fermi GBM Final Real-time Localization
  68. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  69. GRB 220527A: MITSuME Akeno continued optical observation
  70. GRB 220527A: Lick 3m Optical Observations
  71. Konus-Wind detection of GRB 220528A
  72. IPN triangulation of GRB 220528A (short)
  73. GRB 220528A: Fermi GBM Observation
  74. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  75. Konus-Wind observation of GRB 220527A
  76. Swift trigger 1108515 is not an astrophysical event
  77. GRB 220530A: Fermi GBM Final Real-time Localization
  78. Correction to GCN 32148: Should be GRB 220528A
  79. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  80. GRB 220528A: Fermi GBM Final Localization
  81. GRB 220527A: AST3-3 Yaoan Optical Observation
  82. GRB 220527A: REM optical/NIR observations
  83. GRB 220527A: VLT/X-shooter spectroscopic redshift
  84. GRB 220527A: MeerLICHT afterglow observations
  85. GRB 220527A: AstroSat CZTI detection
  86. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  87. GRB 220527A: MITSuME Akeno optical observation
  88. GRB 220527A: Swift/UVOT detection
  89. GRB 220527A: Swift-XRT afterglow detection
  90. Swift trigger 1108208 is not an interesting astrophysical event.
  91. GRB 220527A: Swift ToO observations
  92. GRB 220527A: Fermi-LAT detection
  93. GRB 220527A: Fermi GBM Final Localization
  94. GRB 220527A: AGILE detection
  95. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  96. GRB 220525A: Fermi GBM Detection
  97. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  98. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  100. Konus-Wind detection of GRB 220524B

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