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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19415 results found.

  1. GRB 130816B, Swift-BAT refined analysis
  2. GRB 130816B: GROND afterglow candidate
  3. GRB 130816A: Swift-XRT refined Analysis
  4. GRB 130816A, Swift-BAT refined analysis
  5. GRB 130816A: Fermi GBM observation
  6. GRB 130816B: Swift-XRT refined Analysis
  7. GRB 130816B: Enhanced Swift-XRT position
  8. GRB 130816A: GROND confirmation of afterglow
  9. GRB 130816A: Enhanced Swift-XRT position
  10. GRB 130816B: Swift detection of a burst
  11. GRB 130816A: Swift detection of a burst
  12. Refined IPN Triangulation of GRB 130812B
  13. IPN Triangulation of GRB 130812B (long/soft)
  14. GRB 130812A: Swift/UVOT Upper Limits
  15. GRB 130812A, Swift-BAT refined analysis
  16. GRB 130812A: GROND upper limits
  17. GRB 130812A: Swift-XRT refined Analysis
  18. GRB 130812A: Enhanced Swift-XRT position
  19. GRB 130812A: Swift detection of a burst
  20. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  21. GRB130807A: Swift/UVOT observations
  22. GRB 130807A: Swift-XRT refined analysis
  23. GRB 130806A: Swift/UVOT Upper Limits
  24. GRB 130807A, Swift-BAT refined analysis
  25. GRB 130807A: Swift detection of a GRB or Galactic transient
  26. GRB 130623A: GROND detection of the optical/NIR afterglow
  27. GRB 130806A: Swift-XRT refined Analysis
  28. GRB 130806A, Swift-BAT refined analysis
  29. IPN localization of GRB 130804A
  30. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  31. GRB130803A: GROND observations
  32. GRB 130806A: Enhanced Swift-XRT position
  33. GRB 130806A: Swift detection of a burst
  34. Trigger 565443: Swift detection of a burst from SGR J1745-29
  35. GRB 130803A: Swift-XRT refined Analysis
  36. GRB 130803A: RATIR Optical and NIR Observations
  37. GRB130803A: GROND detection of possible host
  38. GRB 130803A: Swift/UVOT Upper Limits
  39. GRB 130803A; Fermi GBM observation
  40. GRB 130803A, Swift-BAT refined analysis
  41. GRB 130803A: Enhanced Swift-XRT position
  42. GRB 130803A: Faulkes Telescope South Observations
  43. GRB 130803A: Swift detection of a burst
  44. GRB 130727A: Watcher optical limit
  45. GRB 130727A: Swift/UVOT Detection
  46. Konus-Wind observation of GRB 130727A
  47. GRB 130727A: Swift-XRT refined Analysis
  48. GRB 130727A: Fermi GBM detection
  49. GRB 130727A: GROND observations
  50. GRB 130727A: Enhanced Swift-XRT position
  51. GRB 130727A: Swift-BAT refined analysis
  52. GRB 130727A: Swift-XRT observations
  53. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  54. GRB 130727A: Swift detection of a burst
  55. GRB 130725B: Swift/UVOT Observations
  56. GRB 130725B: Swift trigger time correction
  57. GRB 130725A: Swift-XRT refined Analysis
  58. GRB 130725B, Swift-BAT refined analysis
  59. GRB 130725B: Swift-XRT refined Analysis
  60. GRB 130725B - UVOT-enhanced XRT position
  61. GRB 130725A: Swift/UVOT Upper Limits
  62. GRB 130725A - Faulkes Telescope South Observations
  63. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  64. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  65. GRB 130725A, Swift-BAT refined analysis
  66. GRB 130719A: Skynet/PROMPT observations
  67. GRB 130725B: Swift detection of a burst
  68. Swift Trigger 563980 is GRB 130725A
  69. Swift Trigger 563980 cannot be identified at this time.
  70. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  71. Konus-Wind observation of GRB 130722A
  72. GRB 130722A: Swift/UVOT Detection
  73. GRB 130722C Tiled Swift observations
  74. GRB 130722A: Enhanced Swift-XRT position
  75. GRB 130722A: Swift-XRT refined Analysis
  76. GRB 130722A: Skynet/GORT observations
  77. GRB 130719A, Swift-BAT refined analysis
  78. GRB 130715A: Suzaku WAM observation of the prompt emission
  79. GRB 130722A: Swift detection of a burst
  80. GRB 130719A: Swift detection of a burst
  81. GRB 130716A: Fermi GBM observation
  82. GRB 130716A Swift-BAT Spectral lag analysis
  83. GRB 130716A: UVOT Upper Limits
  84. GRB 130716A: Probable short-hard burst with delayed Swift data
  85. GRB 130626A: Retraction of possible X-ray afterglow
  86. GRB 130708A: Swift XRT and UVOT Observations
  87. GRB 130708A: Fermi GBM observation
  88. GRB 130708A found in ground analysis of Swift-BAT data
  89. GRB 130628A: Suzaku WAM observation of the prompt emission
  90. GRB 130702A: Continued UVOT Observations
  91. GRB 130702A: further Swift-XRT observations
  92. Fermi GRB 130702A: Swift XRT and UVOT observations
  93. Fermi394416326: iPTF detection of a possible optical afterglow
  94. GRB 130627B: Swift afterglow confirmation
  95. GRB 130623A: Second Swift-XRT observation
  96. GRB 130701A: Swift-XRT refined Analysis
  97. GRB 130701A: P60 Observations
  98. GRB 130701A, Swift-BAT refined analysis
  99. Konus-Wind observation of GRB 130701A
  100. GRB 130701A: Swift/UVOT Detection

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