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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"

28046 results found.

  1. GRB 080426, Swift-BAT refined analysis
  2. GRB 080426: Swift detection of a possibly short burst
  3. Possible GRB 080315: XRT non-detection of afterglow
  4. GRB 080320 : Faulkes Telescope North Observations
  5. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  6. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  7. GRB080310, BVRcIc field calibration
  8. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  9. Swift XRT and UVOT observations of GRB080414
  10. GRB 080319B: Jet Break, Energetics, Supernova
  11. GRB 080413B: Faulkes Telescope South optical afterglow observations
  12. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  13. GRB 080413A: Suzaku WAM observation of the prompt emission
  14. GRB 080413B: Suzaku WAM observation of the prompt emission
  15. GRB 080414: RTT150 optical observations
  16. GRB 080414: A long GRB detected by INTEGRAL
  17. VLA radio observations of GRB 080413B
  18. VLA radio observations of GRB 080413A
  19. GRB 080413B: Ep,i-Eiso correlation
  20. GRB080413B
  21. Swift-BAT spectral lag analysis of GRB 080413B
  22. GRB 080413a, SMARTS optical/IR afterglow observations
  23. GRB080413A: Swift/UVOT observations
  24. GRB 080413B, Swift-BAT refined analysis
  25. GRB 080413A: Swift-XRT refined analysis
  26. GRB 080413A, Swift-BAT refined analysis
  27. GRB 080413A Bootes observation
  28. GRB080413B: REM NIR & Optical Observation
  29. GRB 080413B: GROND detection of afterglow in all bands
  30. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  31. GRB 080413A: REM detection of the NIR Afterglow
  32. GRB 080413: Enhanced Swift-XRT position
  33. GRB 080413: TAROT Calern observatory optical observations
  34. GRB 080413: Swift detection of a burst with an optical afterglow
  35. GRB 080413: ROTSE-III Detection of Optical Counterpart
  36. GRB 080411: Swift/UVOT refined analysis
  37. GRB 080411, Swift-BAT refined analysis
  38. GRB 080411: Swift-XRT Refined Analysis
  39. GRB 080411: Enhanced Swift-XRT position
  40. GRB 080411: GROND detection of optical afterglow candidate
  41. GRB 080411: Swift detection of a bright burst
  42. GRB 080409: Swift-BAT refined analysis
  43. GRB 080408: GROND detection of optical/NIR afterglow candidate
  44. GRB 080330 optical observations
  45. Swift/UVOT observations of GRB080409
  46. GRB 080409: Swift XRT refined analysis
  47. GRB 080408: Swift-XRT position of a possible afterglow
  48. GRB 080409: Enhanced Swift-XRT position
  49. GRB 080409: REM optical/NIR observations
  50. GRB 080409: Swift detection of a burst
  51. GRB 080408: Analysis of AGILE Gamma-ray data
  52. GRB 080408: GRB Localization by SuperAGILE
  53. GRB 080319A: Early RAPTOR optical limits
  54. GRB 080319B: HST observations
  55. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  56. GRB 080405: Swift-BAT refined analysis
  57. GRB 080405: Swift-XRT position
  58. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  59. GRB 080325: optical upper limit
  60. GRB 080328: GAO 150cm telescope Optical Observation
  61. GRB080330: Improved Swift XRT Position
  62. GRB080330: optical observations
  63. GRB080328, RIMOTS optical upper limit
  64. GRB080330: Swift XRT refined analysis
  65. GRB 080330: REM optical observations
  66. GRB 080330 Swift-UVOT refined analysis
  67. GRB 080328: Suzaku WAM observation of the prompt emission
  68. GRB080330: TNT optical observations
  69. GRB 080330, Swift-BAT refined analysis
  70. Konus-Wind observation of GRB 080328
  71. GRB 080330: GROND Observations
  72. GRB 080330: TAROT Calern observatory optical observations
  73. GRB 080330A: PAIRITEL Infrared Detections
  74. GRB 080330: error in reported XRT position
  75. GRB080330 - SDSS Pre-Burst Observations
  76. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  77. GRB 080330: Swift detection of a burst with an optical counterpart
  78. GRB 080330: TAROT Calern observatory optical detection
  79. GRB 080328, Swift-BAT refined analysis
  80. GRB 080325, Swift-BAT refined analysis
  81. Swift/UVOT observations of GRB080328
  82. GRB080319B, BVRcIc field calibration
  83. GRB 080328: Enhanced Swift-XRT position
  84. GRB 080328: Swift detection of a burst with an optical counterpart
  85. GRB 080325: Subaru detection of NIR afterglow candidate
  86. GRB 080325: GROND Observations
  87. GRB 080325: Swift/UVOT Upper Limits
  88. GRB 080325: Early observations from OSN
  89. GRB 080325: NIR afterglow candidate
  90. GRB 080319D: GROND Detection of the Optical Counterpart
  91. GRB 080325: Enhanced Swift-XRT position
  92. GRB 080325: Swift detection of a burst
  93. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  94. GRB 080319B: Spitzer Mid-infrared Observations
  95. GRB 080319C: Suzaku WAM observation of the prompt emission
  96. Radio Detection of GRB 080319B
  97. GRB 080320, Swift-BAT refined analysis
  98. GRB 080319D: GROND Observations
  99. GRB 080319B: optical upper limit
  100. GRB 080319D: optical upper limit

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