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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"

21907 results found.

  1. GRB 081024B: new Swift-XRT observations
  2. Radio observation of GRB 080229b with ATCA
  3. GRB 081024B: VLA radio observation
  4. GRB 081029: UVOT Detection of the Optical Afterglow
  5. GRB 081025: Suzaku WAM observation of the prompt emission
  6. GRB 081024B: Suzaku WAM observation of the prompt emission
  7. GRB 081029: Enhanced Swift-XRT position
  8. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  9. GRB 081029: REM observations
  10. Radio observation of GRB 080303 with ATCA
  11. Radio observation of GRB 080411 with ATCA
  12. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  13. Swift UVOT observations of GRB081028
  14. GRB 081028: Enhanced Swift-XRT position
  15. GRB 081028: TAROT Calern observatory optical observations
  16. GRB 081028: optical observations at the NOT
  17. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  18. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  19. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  20. GRB 081028: Swift detection of a burst
  21. GRB 081024: No radio detection with the VLA
  22. GRB081025: RTT150 optical observations
  23. GRB081024B: P200 Observations
  24. GRB 081024B: Swift-XRT further observations
  25. Swift UVOT observations of GRB081024B
  26. GRB 081025: Swift-XRT position
  27. GRB 081024B: Swift-XRT observations
  28. GRB 081025: Burst detection from Swift-BAT slew data
  29. Fermi-LAT observation of GRB 081024B
  30. GRB 081024: Enhanced Swift-XRT position
  31. GRB 081024: Faulkes Telescope North optical observations
  32. GRB 081024: Early Super-LOTIS Observations
  33. GRB 081024A: ROTSE-III Optical Limits
  34. GRB 081024: Swift detection of a burst
  35. GRB 081016A: Swift-XRT refined analysis
  36. Swift detection of a possible burst (trigger 332287)
  37. GRB 081017: REM early observations
  38. GRB 081011: Swift XRT refined analysis
  39. GRB 081016B: Enhanced Swift-XRT position
  40. GRB 081016B: ROTSE-III Optical Limits
  41. GRB 081016B: Swift detection of a burst
  42. GRB 081011: Enhanced Swift-XRT position
  43. Swift detection of flare on CC Eri
  44. Trigger 331721 Due to Swift startracker loss-of-lock
  45. Detection of flare star Algol in Swift-BAT slew data
  46. GRB 081012: GROND upper limits
  47. Swift-BAT triggered on the flare star Algol
  48. GRB 081012: Observations from NOT
  49. GRB 081012: Swift/XRT detection
  50. GRB081011: UVOT detection of an optical afterglow
  51. GRB 081011: Swift/XRT detection
  52. GRB 081008, SMARTS optical/IR afterglow observations
  53. GRB 081011: Swift detection of a burst
  54. GRB 081007: Radio Detection
  55. GRB081008: Swift/UVOT observations
  56. GRB 081008: Enhanced Swift-XRT position
  57. GRB 081008: Swift detection of a burst with optical afterglow
  58. GRB081007: Swift/UVOT Observations
  59. GRB 081007, SMARTS optical afterglow observations
  60. GRB 081007: Early RAPTOR measurements of optical counterpart
  61. GRB 081007: Enhanced Swift-XRT position
  62. GRB 081007, Faulkes Telescope North optical observations
  63. GRB 081007: REM NIR and optical counterpart
  64. GRB 081007: Swift detection of a burst with optical afterglow
  65. GRB 081003B: TAROT Calern observatory optical observations
  66. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  67. GRB 081003A: OSN optical observations
  68. GRB 081001: Further observations from OSN
  69. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  70. GRB 081003A: Swift-XRT Team position and analysis
  71. GRB 080928: Fermi GBM detection
  72. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  73. Trigger 330353: Swift detection of a Galactic short soft burst
  74. GRB 081001: Observations from OSN
  75. GRB 080925: Suzaku WAM observation of the prompt emission
  76. GRB 081001: Swift UVOT Observations
  77. GRB 081001: Swift-XRT position
  78. GRB 080928: Watcher observations
  79. GRB 080928: Swift-XRT refined analysis
  80. GRB 080928: GROND DETECTION
  81. GRB 080928: Enhanced Swift-XRT position
  82. GRB 080928: Swift detection of a burst with an optical counterpart
  83. GRB 080925: Fermi GBM Detection
  84. GRB080922, optical upper limit
  85. Swift trigger 325707: Swift/UVOT Upper Limits
  86. Swift trigger 325707: Swift-XRT upper limit
  87. Swift detection of a possible GRB (trigger 325707)
  88. GRB080916A: Suzaku WAM observation of the prompt emission
  89. GRB 080922: Swift/UVOT Upper Limits
  90. Trigger 324561: IGR J08408-4503 detected by Swift
  91. GRB 080919: Swift-XRT refined analysis
  92. GRB 080916C: IRSF/SIRUS NIR Observation
  93. GRB 080916C: GROND Confirmation of the Optical Afterglow
  94. GRB 080916C: GROND Confirmation of the Optical Afterglow
  95. GRB 080919: REM NIR observations
  96. GRB 080919: Swift detection of a short burst
  97. GRB 080915A: GROND upper limits
  98. GRB 080916A: GROND lightcurve
  99. GRB 080916A: Rapid PROMPT Observations
  100. GRB 080916C: Swift UVOT Refined Analysis

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