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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

18338 results found.

  1. Radio observation of GRB 080130 with ATCA
  2. GRB 081102: MASTER prompt optical limit
  3. GRB 081102: Swift-XRT refined analysis
  4. GRB 081102: Enhanced Swift-XRT position
  5. Radio observation of GRB 080218b with ATCA
  6. Radio observation of GRB 080229a with ATCA
  7. GRB 081102: MASTER VWF promt observation
  8. GRB 081102: Swift detection of a burst
  9. SGR 0501+4516: optical observations in August
  10. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  11. GRB 081024B: BTA deep optical observations
  12. GRB 081024B: new Swift-XRT observations
  13. Radio observation of GRB 080229b with ATCA
  14. GRB 081024B: VLA radio observation
  15. GRB 081029: UVOT Detection of the Optical Afterglow
  16. GRB 081029: PROMPT Detections
  17. GRB 081025: Suzaku WAM observation of the prompt emission
  18. GRB 081029: Enhanced Swift-XRT position
  19. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  20. GRB 081029: REM observations
  21. Radio observation of GRB 080303 with ATCA
  22. Radio observation of GRB 080411 with ATCA
  23. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  24. Swift UVOT observations of GRB081028
  25. GRB 081028: Swift-XRT refined analysis
  26. GRB 081028: Enhanced Swift-XRT position
  27. GRB 081028: TAROT Calern observatory optical observations
  28. GRB 081028: optical observations at the NOT
  29. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  30. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  31. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  32. GRB 081028: Swift detection of a burst
  33. GRB 081024: No radio detection with the VLA
  34. GRB081025: RTT150 optical observations
  35. GRB081024B: P200 Observations
  36. GRB 081024B: Swift-XRT further observations
  37. GRB 081025 BAT refined analysis
  38. Swift UVOT observations of GRB081024B
  39. GRB 081025: Swift-XRT position
  40. GRB 081024B: Swift-XRT observations
  41. GRB 081025: Burst detection from Swift-BAT slew data
  42. GRB 081024: Enhanced Swift-XRT position
  43. GRB 081024: Faulkes Telescope North optical observations
  44. GRB 081024A: ROTSE-III Optical Limits
  45. GRB 081024: Swift detection of a burst
  46. GRB 081016A: Swift-XRT refined analysis
  47. Swift detection of a possible burst (trigger 332287)
  48. GRB 081017: REM early observations
  49. GRB 081011: Swift XRT refined analysis
  50. GRB 081016B: Enhanced Swift-XRT position
  51. GRB 081016B: ROTSE-III Optical Limits
  52. GRB 081016B: Swift detection of a burst
  53. GRB 081011: Enhanced Swift-XRT position
  54. Swift detection of flare on CC Eri
  55. Trigger 331721 Due to Swift startracker loss-of-lock
  56. Detection of flare star Algol in Swift-BAT slew data
  57. GRB 081009: Fermi GBM detection
  58. GRB 081012: GROND upper limits
  59. Swift-BAT triggered on the flare star Algol
  60. GRB 081012: Observations from NOT
  61. GRB 081012: Swift/XRT detection
  62. GRB081011: UVOT detection of an optical afterglow
  63. GRB 081011: Swift/XRT detection
  64. GRB 081011, Swift-BAT refined analysis
  65. GRB 081008, SMARTS optical/IR afterglow observations
  66. GRB 081011: Swift detection of a burst
  67. GRB 081007: Radio Detection
  68. GRB 081008: Swift-XRT Refined Analysis
  69. GRB081008: Swift/UVOT observations
  70. GRB 081008: Enhanced Swift-XRT position
  71. GRB 081008: Gemini-South Absorption Redshiftt
  72. GRB 081008: Swift detection of a burst with optical afterglow
  73. GRB081006B: Fermi GBM detection
  74. GRB081007: Swift/UVOT Observations
  75. GRB 081007, SMARTS optical afterglow observations
  76. GRB 081007, Swift-BAT refined analysis
  77. GRB 081007: Early RAPTOR measurements of optical counterpart
  78. GRB 081007: Swift-XRT Team refined analysis
  79. GRB 081007: Enhanced Swift-XRT position
  80. GRB 081007, Faulkes Telescope North optical observations
  81. GRB 081007: REM NIR and optical counterpart
  82. GRB 081007: Swift detection of a burst with optical afterglow
  83. GRB 081003B: TAROT Calern observatory optical observations
  84. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  85. GRB 081003A: OSN optical observations
  86. GRB 081001: Further observations from OSN
  87. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  88. GRB 081003A: Swift-XRT Team position and analysis
  89. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  90. Trigger 330353: Swift detection of a Galactic short soft burst
  91. GRB 081001: Observations from OSN
  92. GRB 081001: Swift UVOT Observations
  93. GRB 081001: Swift-XRT position
  94. GRB 080928: Watcher observations
  95. GRB 080928: GROND DETECTION
  96. GRB 080928: Enhanced Swift-XRT position
  97. GRB 080928: Swift detection of a burst with an optical counterpart
  98. GRB 080925: Fermi GBM Detection
  99. GRB080922, optical upper limit
  100. Swift trigger 325707: Swift/UVOT Upper Limits

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