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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"

28039 results found.

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

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