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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"

36349 results found.

  1. VLA Radio upper limit on GRB 081118
  2. GRB 081118: VLT redshift
  3. GRB 081118: Swift-XRT refined analysis
  4. GRB 081118: GROND detection of afterglow
  5. GRB 081118: optical afterglow candidate
  6. GRB 081118: Swift UVOT Upper Limits
  7. GRB 081118: Swift-BAT refined analysis
  8. GRB 081118: Enhanced Swift-XRT position
  9. GRB 081118: Swift detection of a burst
  10. GRB 081109A: confirmation of possible detection host galaxy
  11. Further Swift-XRT observations of the probable GRB 081105.
  12. GRB 081113: Fermi GBM detection
  13. GRB 081102: RTT150 Optical observations
  14. GRB 081110: Fermi GBM detection
  15. GRB 081110: MASTER: first optical observations Fermi GRB
  16. GRB 081109: TAROT La Silla observatory optical observations
  17. GRB 081102: MASTER refind and final results
  18. GRB 081109: GROND redshift limit and host extinction
  19. GRB 081025: Swift-XRT further analysis
  20. GRB 081024B: Swift-XRT late-time observations
  21. Swift-BAT refined analysis of trigger 334129
  22. GRB 081109B: Swift/UVOT refined analysis
  23. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  24. GRB 081109A: Possible Swift-UVOT detection
  25. GRB 081109A: Faulkes Telescope South observations
  26. GRB 081109A, Swift-BAT refined analysis
  27. GRB 081109A: Swift-XRT refined analysis
  28. GRB 081109: Fermi GBM detection
  29. GRB 081109: Swift/UVOT upper limits
  30. GRB 081109A optical upper limit
  31. GRB 081109: REM NIR afterglow detection
  32. GRB 081109: Swift detection of a burst
  33. GRB 081028 - PAIRITEL NIR detection
  34. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  35. GRB 081102B: Fermi GBM detection
  36. GRB 081105B: Fermi GBM detection
  37. GRB 081107: Fermi GBM detection
  38. GRB 081104: GROND found no Optical/NIR Afterglow
  39. GRB 081105: GROND Upper Limits
  40. Radio observation of GRB 080523 with ATCA
  41. Radio observation of GRB 080520 with ATCA
  42. GRB 081105: Observations from OSN
  43. UVOT/Swift observations of GRB081105
  44. Swift-XRT observations of GRB 081105
  45. GRB 081101B: Fermi GBM detection
  46. Radio observation of GRB 080516 with ATCA
  47. GRB 081105 Swift/BAT and IPN Localization
  48. GRB 081025: Fermi GBM observation
  49. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  50. GRB 081104: refined XRT analysis
  51. GRB 081104: Enhanced Swift-XRT position
  52. GRB 081104: Swift-BAT refined analysis
  53. GRB081104: Swift/UVOT Upper Limits
  54. Fermi Detection of GRB 081102
  55. GRB 081104 : Faulkes Telescope South observations
  56. GRB 081104: Swift-XRT position
  57. GRB 081104: Swift detection of a burst
  58. Radio observation of GRB 080130 with ATCA
  59. GRB 081102: MASTER prompt optical limit
  60. GRB 081102: Swift-XRT refined analysis
  61. GRB 081102: Swift/UVOT refined analysis
  62. GRB 081102: Swift-BAT refined analysis
  63. GRB 081102: Enhanced Swift-XRT position
  64. Radio observation of GRB 080218b with ATCA
  65. Radio observation of GRB 080229a with ATCA
  66. GRB 081102: MASTER VWF promt observation
  67. GRB 081102: OPTIMA-Burst optical upper limit
  68. GRB 081102: Swift detection of a burst
  69. SGR 0501+4516: optical observations in August
  70. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  71. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  72. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  73. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  74. GRB 081024B: BTA deep optical observations
  75. GRB 081028: CrAO optical observations
  76. GRB 081024B: new Swift-XRT observations
  77. Radio observation of GRB 080229b with ATCA
  78. GRB 081029, SMARTS optical/IR afterglow observations
  79. GRB 081024B: VLA radio observation
  80. GRB 081029: UVOT Detection of the Optical Afterglow
  81. GRB 081029: PROMPT Detections
  82. GRB 081029: Redshift Confirmation from Gemini-South
  83. GRB 081029: Swift-BAT refined analysis
  84. GRB081029: Swift XRT refined analysis
  85. GRB 081025: Suzaku WAM observation of the prompt emission
  86. GRB 081024B: Suzaku WAM observation of the prompt emission
  87. GRB 081029: Enhanced Swift-XRT position
  88. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  89. GRB 081029: REM observations
  90. Radio observation of GRB 080303 with ATCA
  91. Radio observation of GRB 080411 with ATCA
  92. GRB 081029: UVES/VLT Absorption Redshift
  93. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  94. GRB 081029: ROTSE-III Detection of Optical Counterpart
  95. GRB 081029: Swift detection of a burst
  96. GRB 081028: Magellan redshift
  97. GRB 081028B: Fermi GBM detection
  98. GRB 081021: Fermi GBM detection
  99. GRB081028: UVOT detection of a brightening afterglow
  100. Swift UVOT observations of GRB081028

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