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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"

6409 results found.

  1. GRB 130806A: Swift-XRT refined Analysis
  2. GRB 130804A; Fermi GBM observation
  3. GRB 130803A: Swift-XRT refined Analysis
  4. GRB 130803A; Fermi GBM observation
  5. GRB 130727A: Swift-XRT refined Analysis
  6. GRB 130727A: Fermi GBM detection
  7. GRB 130725A: Swift-XRT refined Analysis
  8. GRB 130725B: Swift-XRT refined Analysis
  9. Swift Trigger 563980 is GRB 130725A
  10. GRB 130722A: Swift-XRT refined Analysis
  11. GRB 130716A: Fermi GBM observation
  12. GRB 130702A : Xinglong TNT continue optical observation
  13. GRB 130715A: Fermi GBM detection
  14. GRB 130708A: Fermi GBM observation
  15. GRB 130702A: Xinglong TNT optical observation
  16. GRB 130702A: further Swift-XRT observations
  17. GRB 130702A: TNG optical observations
  18. Fermi GRB 130702A: Swift XRT and UVOT observations
  19. GRB 130702A / Fermi394416326: Fermi GBM detection
  20. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  21. GRB 130628A: Fermi GBM detection
  22. Fermi394416326: iPTF detection of a possible optical afterglow
  23. GRB 130627B: Swift afterglow confirmation
  24. GRB 130623A: Second Swift-XRT observation
  25. GRB 130701B: Fermi GBM detection
  26. GRB 130701A: Swift-XRT refined Analysis
  27. GRB 130627A: Swift-XRT refined Analysis
  28. GRB 130627B: Possible Swift-XRT afterglow detection
  29. GRB 130627A: Fermi GBM detection
  30. GRB 130623A: Fermi GBM detection
  31. GRB 130627B: Swift-XRT observations
  32. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  33. GRB 130625A: Swift-XRT refined Analysis
  34. GRB 130623A: Swift-XRT and UVOT observations
  35. GRB 130615A: Continued Skynet/PROMPT Observations
  36. GRB 130615A: Swift-XRT refined Analysis
  37. GRB 130614A: Fermi GBM detection
  38. GRB 130612A: Fermi GBM observation
  39. GRB 130612A: iTelescope T21 optical observations
  40. GRB 130610A: iTelescope T21 optical observations
  41. GRB 130612A: Swift-XRT refined Analysis
  42. GRB 130612A: PAIRITEL NIR Afterglow Observations
  43. GRB 130609B: Fermi GBM observation
  44. GRB 130610A: Fermi GBM Observation
  45. GRB 130606B: Swift/UVOT Upper Limit
  46. GRB 130610A: Swift-XRT refined Analysis
  47. GRB 130609B: Swift-XRT refined Analysis
  48. GRB 130610A: PAIRITEL NIR Afterglow Observations
  49. GRB 130609A: Fermi GBM observation
  50. GRB 130608A: Swift-XRT refined Analysis
  51. GRB 130609A: Swift-XRT refined Analysis
  52. GRB 130606B: Swift-XRT observations
  53. GRB 130603A: AAO optical observations
  54. GRB 130606A: Swift-XRT refined Analysis
  55. GRB 130606A: PAIRITEL NIR Afterglow Observations
  56. GRB 130606B; Fermi GBM observation
  57. GRB 130606A:T100 observations
  58. GRB 130606B: Fermi-LAT detection of a bright hard burst
  59. GRB 130606A: Errata Ks magnutide in GCN 14792
  60. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  61. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  62. Virtual Telescope observations of GRB 130606A
  63. GRB 130605A: Swift-XRT refined Analysis
  64. Swift Trigger 557466 is not astrophysical
  65. GRB 130606A: IRSF NIR Observation
  66. GRB 130604A: Swift-XRT refined Analysis
  67. GRB 130604B: Fermi GBM detection
  68. GRB 130603B: VLT/X-shooter redshift confirmation
  69. GRB 130603B: Swift-XRT refined Analysis
  70. GRB 130603A: Swift-XRT refined Analysis
  71. GRB 130528A: Fermi GBM detection
  72. GRB 130529A: Swift-XRT refined Analysis
  73. GRB 130528A: Swift-XRT refined Analysis
  74. GRB 130527A: Swift-XRT refined Analysis
  75. GRB 130514B: Further Swift-XRT Observations
  76. Swift XRT observation of GRB 130518B
  77. GRB 130518A: Confirmation of the X-ray afterglow.
  78. GRB 130518A: Swift XRT and UVOT possible afterglow
  79. GRB 130518A: Fermi LAT detection
  80. GRB 130518A: Fermi GBM detection
  81. GRB 130515A: IRSF NIR Observation
  82. GRB 130515A: Fermi GBM detection
  83. GRB 130515A: Swift-XRT refined Analysis
  84. GRB 130514B: Swift-XRT Observations
  85. GRB 130514A: Swift-XRT refined Analysis
  86. GRB 130513A: Swift-XRT detection of the afterglow.
  87. GRB 130511A: Swift-XRT refined Analysis
  88. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  89. GRB 130505B: Further Swift observations
  90. GRB 130504C: Swift-XRT afterglow confirmation
  91. GRB 130505B: Swift Candidate Afterglow
  92. GRB 130505A: Tautenburg afterglow observations
  93. GRB 130504C: further Swift-XRT observations
  94. GRB 130504C: Swift-XRT observations
  95. GRB 130504C: Fermi GBM detection
  96. GRB 130505A: Swift-XRT refined Analysis
  97. GRB 130504C: Fermi-LAT detection of a burst
  98. GRB 130505A: iTelescope T12 optical observations
  99. GRB 130504B: Fermi GBM detection
  100. GRB 130502B: Swift-XRT refined Analysis

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