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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"

39409 results found.

  1. GRB 220724A: Fermi GBM Final Real-time Localization
  2. GRB 220715B: VIRT Optical Upper Limit
  3. Fermi GRB 220721A: Global MASTER-Net observations report
  4. GRB 220721A: Fermi GBM Final Real-time Localization
  5. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  6. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 220719A: Fermi GBM Final Real-time Localization
  9. GRB 220715B: Swift-BAT refined analysis
  10. GRB220714B: UVOT detections
  11. GRB 220715B: Fermi GBM detection
  12. GRB 220715B: Swift-XRT refined Analysis
  13. GRB 220715B: Swift/UVOT Upper Limits
  14. GRB 220715B: Enhanced Swift-XRT position
  15. GRB 220715B: BOOTES-network optical upper limits
  16. Swift GRB 220715B: Global MASTER-Net observations report
  17. GRB 220715B: Prompt enhanced Swift-XRT position
  18. GRB 220715B: Swift detection of a burst
  19. GRB 220715B: Fermi GBM Final Real-time Localization
  20. GRB 220714B: Swift-BAT refined analysis
  21. GRB 220714B: Fermi GBM observation
  22. GRB 220715A: AGILE/MCAL detection
  23. GRB 220714B: LCO Optical Observations
  24. GRB 220715A: Fermi GBM Final Real-time Localization
  25. GRB 220714B: Swift-XRT refined Analysis
  26. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  27. GRB 220714B: UVOT afterglow discovery
  28. GRB 220714B: Enhanced Swift-XRT position
  29. GRB 220713A: Fermi GBM Final Localization
  30. GRB 220714B: Swift detection of a burst
  31. GRB 220714B: Fermi GBM Final Real-time Localization
  32. GRB 220714A: Possible Swift detection of a burst
  33. GRB 220710A: Swift/UVOT Upper Limits
  34. GRB 220711C: Fermi GBM Observation
  35. Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
  36. GRB 220711B: 10.4 m GTC(+EMIR) observations
  37. GRB 220711B: 10.4 m GTC(+EMIR) observations
  38. GRB 220710A: Swift-XRT afterglow detection
  39. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  40. GRB 220711B, GROND observations
  41. Konus-Wind detection of GRB 220711C
  42. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  43. GRB 220711B: GIT optical upper limits
  44. Fermi trigger No 679248723: Global MASTER-Net observations report
  45. Fermi GRB 220711B: Global MASTER-Net observations report
  46. GRB 220712B: NOT optical afterglow confirmation
  47. GRB 220710A: Swift ToO observations
  48. GRB 220710A: Swift/BAT-GUANO arcminute localization
  49. GRB 220711B: Swift-BAT refined analysis
  50. IPN triangulation of GRB 220711C (short)
  51. GRB 220711B: Swift-XRT refined Analysis
  52. GRB 220711B: Swift/UVOT Upper Limits
  53. GRB 220711B: Enhanced Swift-XRT position
  54. GRB 220711B: Fermi GBM Detection
  55. GRB 220711B: NOT optical observations
  56. GRB 220711B: LCO Optical Upper Limits
  57. GRB 220711B: Swift detection of a burst
  58. GRB 220711B: Fermi GBM Final Real-time Localization
  59. GRB 220707A: AstroSat CZTI detection
  60. GRB 220708B: GIT optical upper limits
  61. GRB 220711A: Fermi GBM Final Real-time Localization
  62. GRB 220708A: Swift-BAT refined analysis
  63. GRB 220708B: T193-OHP optical upper limit
  64. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  65. Konus-Wind detection of GRB 220708B
  66. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  67. GRB 220708B: Nanshan/NEXT optical upper limits
  68. GRB 220708A: Swift/UVOT Upper Limits
  69. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  70. GRB 220708A: Swift-XRT refined Analysis
  71. GRB 220706A: Swift/UVOT Upper Limits
  72. GRB 220708B: Swift-XRT afterglow detection
  73. GRB 220708A: BOOTES-5/JGT early optical upper limit
  74. GRB 220706A: Swift-BAT refined analysis
  75. GRB 220708A: Enhanced Swift-XRT position
  76. GRB 220708B: Swift ToO observations
  77. GRB 220708B: Swift/BAT-GUANO arcminute localization
  78. GRB 220708A: Swift-XRT observations
  79. GRB 220708A: Swift detection of a burst
  80. GRB 220706A: LCO Optical Upper Limits
  81. GRB 220627A: ATCA detection of radio counterpart
  82. GRB 220706A: Swift-XRT refined Analysis
  83. GRB 220706A, GROND observations
  84. GRB 220706A: Optical observations from NOT
  85. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  86. GRB 220702B: AstroSat CZTI detection
  87. GRB 220706A: Nanshan/NEXT optical upper limits
  88. MAXI GRB220706.73: Global MASTER-Net observations report
  89. GRB 220706A: Enhanced Swift-XRT position
  90. Swift GRB 220706A: Global MASTER-Net observations report
  91. GRB 220706A: Zadko observatory - Gingin optical observations
  92. GRB 220706A: Prompt enhanced Swift-XRT position
  93. GRB 220706A: Swift detection of a burst
  94. GRB 220701A: Swift-BAT refined analysis
  95. GRB 220702B: Fermi GBM Final Localization
  96. GRB 220702A: Fermi GBM Final Localization
  97. GRB 220705A: Fermi GBM Final Localization
  98. Fermi trigger No 678635286: Global MASTER-Net observations report
  99. GRB 220701A: MITSuME Akeno optical upper limits
  100. GRB 220701A: COATLI Optical Upper Limit

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