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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"

37304 results found.

  1. GRB 080330: Swift-XRT refined position retraction
  2. GRB 080408: GROND detection of optical/NIR afterglow candidate
  3. GRB 080330 optical observations
  4. Swift/UVOT observations of GRB080409
  5. GRB 080409: Swift XRT refined analysis
  6. UVOT/Swift Observations of GRB080408
  7. GRB 080408: Swift-XRT position of a possible afterglow
  8. GRB 080409: Enhanced Swift-XRT position
  9. GRB 080409: REM optical/NIR observations
  10. GRB 080409: Swift detection of a burst
  11. GRB 080408: Analysis of AGILE Gamma-ray data
  12. GRB 080408: GRB Localization by SuperAGILE
  13. GRB 080319B: HST observations
  14. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  15. GRB 080405: Swift-BAT refined analysis
  16. GRB 080405: Swift-XRT position
  17. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  18. GRB 080325: optical upper limit
  19. GRB080330: Improved Swift XRT Position
  20. GRB080330: optical observations
  21. GRB 080319B: TORTORA light curve (Correction)
  22. GRB080328, RIMOTS optical upper limit
  23. GRB080330: optical observations
  24. GRB080330: Swift XRT refined analysis
  25. GRB 080330: REM optical observations
  26. GRB 080330, SMARTS optical/IR afterglow observations
  27. GRB 080330 Swift-UVOT refined analysis
  28. GRB 080328: Suzaku WAM observation of the prompt emission
  29. GRB080330: TNT optical observations
  30. Konus-Wind observation of GRB 080328
  31. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  32. GRB080330: LOAO R-band Detection
  33. GRB 080330: GROND Observations
  34. GRB 080330: NOT redshift
  35. GRB 080330: error in reported XRT position
  36. GRB080330 - SDSS Pre-Burst Observations
  37. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  38. GRB 080330: Swift detection of a burst with an optical counterpart
  39. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  40. GRB 080328: BTA optical imaging and spectroscopy
  41. GRB 080328: Swift XRT refined analysis
  42. Swift/UVOT observations of GRB080328
  43. GRB080325 - I and z-band Imaging
  44. GRB080319B, BVRcIc field calibration
  45. GRB 080328: Enhanced Swift-XRT position
  46. GRB080328: Faulkes Telescope North observations
  47. GRB 080328: Swift detection of a burst with an optical counterpart
  48. GRB 080325: Subaru detection of NIR afterglow candidate
  49. GRB080310, late-time photometry with LBT
  50. GRB 080325: MITSuME Akeno optical upper limits
  51. GRB080325: XRT Refined Analysis
  52. GRB 080325: GROND Observations
  53. GRB080319B: optical observations
  54. GRB 080325: Swift/UVOT Upper Limits
  55. GRB 080319C: Gemini-North spectroscopic redshift
  56. GRB 080319D: GROND Detection of the Optical Counterpart
  57. GRB 080325: Enhanced Swift-XRT position
  58. GRB 080325: Swift detection of a burst
  59. IBAS Alert n. 5245: NOT a GRB
  60. GRB 080319B: Spitzer Mid-infrared Observations
  61. GRB 080319C: Suzaku WAM observation of the prompt emission
  62. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  63. Radio Detection of GRB 080319B
  64. GRB 080319D: GROND Observations
  65. GRB 080319B: TORTORA light curve
  66. GRB 080319B: optical upper limit
  67. GRB 080319D: optical upper limit
  68. GRB 080319C: UVOT Observations
  69. GRB 080319B: UVOT Observations
  70. GRB 080319A: UVOT Observations
  71. GRB 080320: Swift XRT refined analysis
  72. GRB 080319B - CARMA mm Observations
  73. GRB 080320: Early Super-LOTIS Observations
  74. GRB 080319D: Swift XRT refined analysis
  75. GRB 080320: optical limit
  76. GRB 080320: Gemini-N optical afterglow
  77. Konus-Wind observation of GRB 080319C
  78. GRB 080319B: Gemini-South photometry
  79. GRB 080319B: Allen Telescope Array Observations
  80. GRB 080319B optical observations
  81. GRB 080319C, Swift-BAT refined analysis
  82. Konus-Wind observation of GRB 080319B
  83. GRB 080319B: WSRT Radio Observations
  84. GRB 080320: Enhanced Swift-XRT position
  85. GRB 080320: optical limit from IAC80
  86. GRB 080319B: second epoch imaging from Canarias (correction to GCN7469)
  87. GRB 080319C: KAIT OA observations
  88. GRB 080320 - SDSS Pre-Burst Observations
  89. GRB 080320: Swift detection of a burst
  90. GRB 080320: ROTSE-III Optical Limits
  91. GRB 080319B : Lulin observation of temporal break at 0.2 days
  92. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  93. GRB 080319B: optical observations
  94. GRB 080319C - SDSS Pre-Burst Observations
  95. GRB 080319A SDSS Pre-Burst Observations
  96. Swift-BAT trigger 306829 is IGR J16479-4514
  97. GRB080319B - SDSS Pre-Burst Observations
  98. GRB 080319A: Swift-XRT Team Refined Analysis
  99. GRB 080319B, Swift-BAT refined analysis
  100. GRB 080319C: Swift-XRT Team Refined Analysis

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