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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"

43602 results found.

  1. GRB 130702A / Fermi394416326: Fermi GBM detection
  2. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  3. Fermi GBM trigger 394416326: MASTER early optical limit
  4. GRB 130628A: Fermi GBM detection
  5. Fermi394416326: FTN detection
  6. Fermi394416326: iPTF detection of a possible optical afterglow
  7. GRB 130627B: Swift afterglow confirmation
  8. Fermi GBM trigger 394325281 / 130630950 is not a GRB
  9. GRB 130623A: Second Swift-XRT observation
  10. GRB 130701B: Fermi GBM detection
  11. GRB 130701A: Swift-XRT refined Analysis
  12. GRB 130701A: P60 Observations
  13. GRB 130701A, Swift-BAT refined analysis
  14. Konus-Wind observation of GRB 130701A
  15. GRB 130701A: Swift/UVOT Detection
  16. GRB 130701A: VLT/X-shooter redshift
  17. GRB 130701A: Enhanced Swift-XRT position
  18. GRB 130701A: optical afterglow from the NOT
  19. GRB 130701A: Swift detection of a burst
  20. GRB 130627B, Swift-BAT refined analysis
  21. GRB 130627A, Swift-BAT refined analysis
  22. GRB 130627A: Swift-XRT refined Analysis
  23. GRB 130627B: Possible Swift-XRT afterglow detection
  24. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  25. GRB 130627A: Enhanced Swift-XRT position
  26. GRB 130626A: KAIT Optical Observations
  27. GRB 130626A: RATIR Optical Observations
  28. GRB 130626A, Swift-BAT refined analysis
  29. GRB 130627A: Fermi GBM detection
  30. GRB 130623A: Fermi GBM detection
  31. GRB130627B: Swift/UVOT Observations
  32. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  33. GRB 130627B: Swift detection of a burst
  34. GRB 130627A: Swift-XRT observations
  35. GRB 130627A: Swift/UVOT Observation
  36. GRB 130627A: Swift detection of a burst
  37. Swift Trigger 559108 is not astrophysical
  38. GRB 130626A: Swift detection of a short burst
  39. GRB 130625A: Swift-XRT refined Analysis
  40. GRB 130625A: MASTER afterglow limit
  41. GRB 130625A: Nanshan optical upper limit
  42. GRB 130623A: Swift-XRT and UVOT observations
  43. GRB 130625A: Swift-BAT refined analysis
  44. GRB 130625A: Enhanced Swift-XRT position
  45. GRB 130625A: Swift detection of a burst
  46. GRB 130603B: First epoch of XMM-Newton observations
  47. GRB 130623A detected in ground analysis of Swift-BAT data
  48. Swift Trigger 558828 is not an interesting event
  49. Swift Trigger 558631: AAO optical observations
  50. GRB 130614A: Suzaku WAM observation of the prompt emission
  51. Swift Trigger 558631 is not a real source
  52. GRB 130612A: Swift-BAT refined analysis
  53. GRB 130609B: Suzaku WAM observation of the prompt emission
  54. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  55. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  56. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  57. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  58. Swift Trigger 557910 is not astrophysical
  59. GRB 130615A: Continued Skynet/PROMPT Observations
  60. GRB 130610A: TAROT La Silla observatory optical observations
  61. GRB 130610A: CrAO optical observations
  62. GRB 130615A: Zadko observatory - Gingin optical observations
  63. GRB 130615A: TAROT La Silla observatory optical observations
  64. GRB 130615A: Swift-XRT refined Analysis
  65. GRB 130614A: Fermi GBM detection
  66. GRB 130615A: Skynet/PROMPT Observations
  67. GRB 130615A: Enhanced Swift-XRT position
  68. GRB 130615A: Swift-BAT refined analysis
  69. GRB 130615A: GROND afterglow candidate
  70. GRB 130615A: Swift detection of a burst
  71. GRB 130612A: Fermi GBM observation
  72. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  73. GRB 130612A: iTelescope T21 optical observations
  74. GRB 130603B: HST limits on an underlying supernova
  75. GRB 130606B: Suzaku WAM observation of the prompt emission
  76. GRB 130610A: iTelescope T21 optical observations
  77. GRB 130612A: ISON-NM optical observations
  78. GRB 130609B: Theoretical redshift estimation
  79. GRB 130612A: Swift/UVOT Detection
  80. GRB 130612A: Swift-XRT refined Analysis
  81. GRB 130612A: Zadko observatory - Gingin optical observations
  82. GRB 130612A: Enhanced Swift-XRT position
  83. GRB 130612A: TAROT La Silla observatory optical observations
  84. GRB 130612A: VLT/X-shooter redshift
  85. GRB130612A OSN I-band observations
  86. GRB 130612A: RATIR Optical Observations
  87. GRB 130612A: P60 Observations
  88. GRB 130612A: NOT optical observations
  89. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  90. GRB 130612A: PAIRITEL NIR Afterglow Observations
  91. GRB 130612A: Liverpool Telescope Afterglow detection
  92. GRB 130612A: Swift detection of a burst with an optical counterpart
  93. Konus-Wind observation of GRB 130610B
  94. GRB 130609B: Fermi GBM observation
  95. IPN Triangulation of GRB 130610B (long/multipeaked)
  96. GRB 130609B, Further Swift-BAT refined analysis
  97. GRB 130609B: GROND observations
  98. GRB 130606A: CrAO optical upper limit
  99. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  100. GRB 130609B, Swift-BAT refined analysis

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