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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"

28101 results found.

  1. GRB 080409: Swift XRT refined analysis
  2. GRB 080408: Swift-XRT position of a possible afterglow
  3. GRB 080409: Enhanced Swift-XRT position
  4. GRB 080409: REM optical/NIR observations
  5. GRB 080409: Swift detection of a burst
  6. GRB 080408: Analysis of AGILE Gamma-ray data
  7. GRB 080408: GRB Localization by SuperAGILE
  8. GRB 080319A: Early RAPTOR optical limits
  9. GRB 080319B: HST observations
  10. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  11. GRB 080405: Swift-BAT refined analysis
  12. GRB 080405: Swift-XRT position
  13. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  14. GRB 080325: optical upper limit
  15. GRB 080328: GAO 150cm telescope Optical Observation
  16. GRB080330: Improved Swift XRT Position
  17. GRB080330: optical observations
  18. GRB080328, RIMOTS optical upper limit
  19. GRB080330: Swift XRT refined analysis
  20. GRB 080330: REM optical observations
  21. GRB 080330 Swift-UVOT refined analysis
  22. GRB 080328: Suzaku WAM observation of the prompt emission
  23. GRB080330: TNT optical observations
  24. GRB 080330, Swift-BAT refined analysis
  25. Konus-Wind observation of GRB 080328
  26. GRB 080330: GROND Observations
  27. GRB 080330: TAROT Calern observatory optical observations
  28. GRB 080330A: PAIRITEL Infrared Detections
  29. GRB 080330: error in reported XRT position
  30. GRB080330 - SDSS Pre-Burst Observations
  31. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  32. GRB 080330: Swift detection of a burst with an optical counterpart
  33. GRB 080330: TAROT Calern observatory optical detection
  34. GRB 080328, Swift-BAT refined analysis
  35. GRB 080325, Swift-BAT refined analysis
  36. Swift/UVOT observations of GRB080328
  37. GRB080319B, BVRcIc field calibration
  38. GRB 080328: Enhanced Swift-XRT position
  39. GRB 080328: Swift detection of a burst with an optical counterpart
  40. GRB 080325: Subaru detection of NIR afterglow candidate
  41. GRB 080325: GROND Observations
  42. GRB 080325: Swift/UVOT Upper Limits
  43. GRB 080325: Early observations from OSN
  44. GRB 080325: NIR afterglow candidate
  45. GRB 080319D: GROND Detection of the Optical Counterpart
  46. GRB 080325: Enhanced Swift-XRT position
  47. GRB 080325: Swift detection of a burst
  48. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  49. GRB 080319B: Spitzer Mid-infrared Observations
  50. GRB 080319C: Suzaku WAM observation of the prompt emission
  51. Radio Detection of GRB 080319B
  52. GRB 080320, Swift-BAT refined analysis
  53. GRB 080319D: GROND Observations
  54. GRB 080319B: optical upper limit
  55. GRB 080319D: optical upper limit
  56. GRB 080319D, Swift-BAT refined analysis
  57. GRB 080319C: UVOT Observations
  58. GRB 080319B: UVOT Observations
  59. GRB 080319A: UVOT Observations
  60. GRB 080320: Swift XRT refined analysis
  61. GRB 080320: J detection with FLAMINGOS
  62. GRB 080319D: Swift XRT refined analysis
  63. GRB 080320: optical limit
  64. GRB 080320: Gemini-N optical afterglow
  65. GRB 080319C, Swift-BAT refined analysis
  66. GRB 080320: Enhanced Swift-XRT position
  67. GRB 080320 - SDSS Pre-Burst Observations
  68. GRB 080320: Swift detection of a burst
  69. GRB 080319B : Lulin observation of temporal break at 0.2 days
  70. GRB 080319C - SDSS Pre-Burst Observations
  71. GRB 080319A SDSS Pre-Burst Observations
  72. GRB080319B - SDSS Pre-Burst Observations
  73. GRB 080319A: Swift-XRT Team Refined Analysis
  74. GRB 080319B, Swift-BAT refined analysis
  75. GRB 080319C: Swift-XRT Team Refined Analysis
  76. GRB 080319B: Swift-XRT Team Refined Analysis
  77. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  78. GRB 080319C: AGILE-MCAL observation of the prompt emission
  79. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  80. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  81. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  82. GRB 080319B: TORTORA synchronous observation
  83. GRB 080319B: Enhanced Swift-XRT position
  84. GRB 080319A: Enhanced Swift-XRT position
  85. GRB 080319A, Swift-BAT refined analysis
  86. GRB 080319B: REM early data
  87. GRB 080319C: Swift detection of a burst with an optical afterglow
  88. GRB 080319A: REM observations
  89. GRB 080319B: Change in power law decay index
  90. GRB 080319B: Gemini-South Spectroscopy
  91. GRB 080319A: optical observations at the NOT
  92. GRB 080319B: REM observations
  93. GRB080319A: P60 Optical Afterglow Observations
  94. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  95. GRB 080319A: Swift detection of a burst
  96. Swift Trigger 306745 is not a GRB
  97. Swift Trigger 306616 is not a GRB
  98. GRB080315: Bok Optical Observations
  99. Swift/UVOT observations of GRB 080315
  100. Swift trigger 306323: Swift-BAT/XRT refined analysis

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