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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"

19599 results found.

  1. GRB 130812A: Swift/UVOT Upper Limits
  2. GRB 130812A, Swift-BAT refined analysis
  3. GRB 130812A: GROND upper limits
  4. GRB 130812A: Swift-XRT refined Analysis
  5. GRB 130812A: Enhanced Swift-XRT position
  6. GRB 130812A: Swift detection of a burst
  7. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  8. GRB130807A: Swift/UVOT observations
  9. GRB 130807A: Swift-XRT refined analysis
  10. GRB 130806A: Swift/UVOT Upper Limits
  11. GRB 130807A, Swift-BAT refined analysis
  12. GRB 130807A: Swift detection of a GRB or Galactic transient
  13. GRB 130623A: GROND detection of the optical/NIR afterglow
  14. GRB 130806A: Swift-XRT refined Analysis
  15. GRB 130806A, Swift-BAT refined analysis
  16. IPN localization of GRB 130804A
  17. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  18. GRB130803A: GROND observations
  19. GRB 130806A: Enhanced Swift-XRT position
  20. GRB 130806A: Swift detection of a burst
  21. Trigger 565443: Swift detection of a burst from SGR J1745-29
  22. GRB 130803A: Swift-XRT refined Analysis
  23. GRB 130803A: RATIR Optical and NIR Observations
  24. GRB130803A: GROND detection of possible host
  25. GRB 130803A: Swift/UVOT Upper Limits
  26. GRB 130803A; Fermi GBM observation
  27. GRB 130803A, Swift-BAT refined analysis
  28. GRB 130803A: Enhanced Swift-XRT position
  29. GRB 130803A: Faulkes Telescope South Observations
  30. GRB 130803A: Swift detection of a burst
  31. GRB 130727A: Watcher optical limit
  32. GRB 130727A: Swift/UVOT Detection
  33. Konus-Wind observation of GRB 130727A
  34. GRB 130727A: Swift-XRT refined Analysis
  35. GRB 130727A: Fermi GBM detection
  36. GRB 130727A: GROND observations
  37. GRB 130727A: Enhanced Swift-XRT position
  38. GRB 130727A: Swift-BAT refined analysis
  39. GRB 130727A: Swift-XRT observations
  40. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  41. GRB 130727A: Swift detection of a burst
  42. GRB 130725B: Swift/UVOT Observations
  43. GRB 130725B: Swift trigger time correction
  44. GRB 130725A: Swift-XRT refined Analysis
  45. GRB 130725B, Swift-BAT refined analysis
  46. GRB 130725B: Swift-XRT refined Analysis
  47. GRB 130725B - UVOT-enhanced XRT position
  48. GRB 130725A: Swift/UVOT Upper Limits
  49. GRB 130725A - Faulkes Telescope South Observations
  50. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  51. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  52. GRB 130725A, Swift-BAT refined analysis
  53. GRB 130719A: Skynet/PROMPT observations
  54. GRB 130725B: Swift detection of a burst
  55. Swift Trigger 563980 is GRB 130725A
  56. Swift Trigger 563980 cannot be identified at this time.
  57. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  58. Konus-Wind observation of GRB 130722A
  59. GRB 130722A: Swift/UVOT Detection
  60. GRB 130722C Tiled Swift observations
  61. GRB 130722A: Enhanced Swift-XRT position
  62. GRB 130722A: Swift-XRT refined Analysis
  63. GRB 130722A: Skynet/GORT observations
  64. GRB 130719A, Swift-BAT refined analysis
  65. GRB 130715A: Suzaku WAM observation of the prompt emission
  66. GRB 130722A: Swift detection of a burst
  67. GRB 130719A: Swift detection of a burst
  68. GRB 130716A: Fermi GBM observation
  69. GRB 130716A Swift-BAT Spectral lag analysis
  70. GRB 130716A: UVOT Upper Limits
  71. GRB 130716A: Probable short-hard burst with delayed Swift data
  72. GRB 130626A: Retraction of possible X-ray afterglow
  73. GRB 130708A: Swift XRT and UVOT Observations
  74. GRB 130708A: Fermi GBM observation
  75. GRB 130708A found in ground analysis of Swift-BAT data
  76. GRB 130628A: Suzaku WAM observation of the prompt emission
  77. GRB 130702A: Continued UVOT Observations
  78. GRB 130702A: further Swift-XRT observations
  79. Fermi GRB 130702A: Swift XRT and UVOT observations
  80. Fermi394416326: iPTF detection of a possible optical afterglow
  81. GRB 130627B: Swift afterglow confirmation
  82. GRB 130623A: Second Swift-XRT observation
  83. GRB 130701A: Swift-XRT refined Analysis
  84. GRB 130701A: P60 Observations
  85. GRB 130701A, Swift-BAT refined analysis
  86. Konus-Wind observation of GRB 130701A
  87. GRB 130701A: Swift/UVOT Detection
  88. GRB 130701A: Enhanced Swift-XRT position
  89. GRB 130701A: Swift detection of a burst
  90. GRB 130627B, Swift-BAT refined analysis
  91. GRB 130627A, Swift-BAT refined analysis
  92. GRB 130627B: Swift/UVOT Upper Limits
  93. GRB 130627A: Swift/UVOT Upper Limits
  94. GRB 130627A: Swift-XRT refined Analysis
  95. GRB 130627B: Possible Swift-XRT afterglow detection
  96. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  97. GRB 130627A: Enhanced Swift-XRT position
  98. GRB 130626A: RATIR Optical Observations
  99. GRB 130626A, Swift-BAT refined analysis
  100. GRB 130627A: Fermi GBM detection

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