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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"

39438 results found.

  1. GRB 220620B: Fermi GBM Final Real-time Localization
  2. Integral GRB220619.53: Global MASTER-Net observations report
  3. GRB 220619A: AstroSat CZTI detection
  4. Swift GRB220620.02: Global MASTER-Net observations report
  5. GRB 220620A: Fermi GBM Final Real-time Localization
  6. GRB 220611A: Continued Gemini Infrared Observations
  7. GRB 220617A: TNG optical observations
  8. Fermi trigger No 677307509: Global MASTER-Net observations report
  9. Fermi trigger No 677236224: Global MASTER-Net observations report
  10. GRB 220617A: Fermi GBM observation
  11. GRB 220611A optical counterpart
  12. GRB 220618A: Swift-XRT refined Analysis
  13. IPN triangulation of GRB 220617A (short)
  14. GRB 220618A: BOOTES-5/JGT early optical upper limit
  15. GRB 220618A: Swift/UVOT Upper Limits
  16. GRB220611A: Gemini Optical Afterglow Confirmation
  17. GRB 220618A: Enhanced Swift-XRT position
  18. GRB 220617A: Swift-XRT observations
  19. GRB 220618A: Swift detection of a burst
  20. Swift GRB220618.38: Global MASTER-Net observations report
  21. GRB 220617A: Fermi-LAT detection
  22. GRB 220617B: Swift ToO observations
  23. Fermi GRB 220617A: Global MASTER-Net observations report
  24. GRB 220617A: Fermi GBM Final Real-time Localization
  25. GRB 220611A: Gemini Ks counterpart detection
  26. Fermi trigger No 677174940: Global MASTER-Net observations report
  27. Konus-Wind detection of GRB 220613A
  28. IPN triangulation of GRB 220613A
  29. GRB 220611A: Gemini South Infrared Detection
  30. IPN triangulation of GRB 220606C
  31. GRB 220611A: Swift/UVOT Upper Limits
  32. Fermi trigger No 676909037: Global MASTER-Net observations report
  33. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  34. GRB 220612A: Swift/BAT-GUANO detection
  35. GRB 220611A: Swift-BAT refined analysis
  36. GRB 220608B: Detection by VZLUSAT-2
  37. Swift GRB 220611A: Global MASTER-Net observations report
  38. GRB 220611A: Swift-XRT refined Analysis
  39. GRB 220610B: AstroSat CZTI detection
  40. GRB 220611A: Enhanced Swift-XRT position
  41. GRB 220611A: Swift detection of a burst
  42. IPN triangulation of GRB 220609B
  43. Fermi GRB 220610A: Global MASTER-Net observations report
  44. GRB 220610A: Fermi GBM Final Real-time Localization
  45. Fermi trigger No 676537486: Global MASTER-Net observations report
  46. GRB 220609B: AstroSat CZTI detection
  47. GRB 220609B: CALET Gamma-Ray Burst Monitor detection
  48. Fermi trigger No 676366592: Global MASTER-Net observations report
  49. GRB 220608A: AstroSat CZTI detection
  50. GRB 220609A: Fermi GBM Final Real-time Localization
  51. GRB 220606A: Fermi GBM observation
  52. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  53. Fermi GRB 220608A: Global MASTER-Net observations report
  54. GRB 220608A: Fermi GBM Final Real-time Localization
  55. GRB 220606B: Gemini South Optical Observations
  56. MAXI GRB220607.31: Global MASTER-Net observations report
  57. MAXI GRB220607.41: Global MASTER-Net observations report
  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. Fermi GRB 220606B: Global MASTER-Net observations report
  67. GRB 220606B: Fermi GBM Final Real-time Localization
  68. GRB 220606A: Fermi GBM Final Real-time Localization
  69. IPN triangulation of GRB 220601A (long)
  70. Fermi trigger No 675992935: Global MASTER-Net observations report
  71. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  72. GRB 220527A: MITSuME Akeno continued optical observation
  73. GRB 220527A: Lick 3m Optical Observations
  74. Konus-Wind detection of GRB 220528A
  75. IPN triangulation of GRB 220528A (short)
  76. GRB 220528A: Fermi GBM Observation
  77. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  78. Fermi GRB 220530A: Global MASTER-Net observations report
  79. Konus-Wind observation of GRB 220527A
  80. GRB 220530A: Fermi GBM Final Real-time Localization
  81. Correction to GCN 32148: Should be GRB 220528A
  82. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  83. GRB 220528A: Fermi GBM Final Localization
  84. GRB 220527A: AST3-3 Yaoan Optical Observation
  85. GRB 220527A: REM optical/NIR observations
  86. GRB 220527A: VLT/X-shooter spectroscopic redshift
  87. GRB 220527A: MeerLICHT afterglow observations
  88. Fermi trigger No 675411172: Global MASTER-Net observations report
  89. GRB 220527A: NOT optical photometry and spectroscopic redshift
  90. GRB 220527A: AstroSat CZTI detection
  91. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  92. GRB 220527A: MITSuME Akeno optical observation
  93. LAT GRB220527.39: Global MASTER-Net observations report
  94. GRB 220527A: Swift/UVOT detection
  95. GRB 220527A: Swift-XRT afterglow detection
  96. GRB 220527A: Fermi GBM Observation
  97. GRB 220527A: Swift ToO observations
  98. GRB 220527A: Fermi-LAT detection
  99. GRB 220527A: Fermi GBM Final Localization
  100. GRB 220527A: AGILE detection

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