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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"

25840 results found.

  1. VLA radio observations of GRB 080413B
  2. VLA radio observations of GRB 080413A
  3. GRB080413B
  4. Swift-BAT spectral lag analysis of GRB 080413B
  5. GRB 080413a, SMARTS optical/IR afterglow observations
  6. GRB 080413B: Swift XRT refined analysis
  7. GRB080413A: Swift/UVOT observations
  8. GRB 080413A: Swift-XRT refined analysis
  9. GRB080413B: REM NIR & Optical Observation
  10. GRB 080413B: GROND detection of afterglow in all bands
  11. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  12. GRB 080413A: REM detection of the NIR Afterglow
  13. GRB 080413: Enhanced Swift-XRT position
  14. GRB 080413: TAROT Calern observatory optical observations
  15. GRB 080413: Swift detection of a burst with an optical afterglow
  16. GRB 080411: Swift/UVOT refined analysis
  17. GRB 080411: Swift-XRT Refined Analysis
  18. Konus-Wind observation of GRB 080411
  19. GRB 080411: Enhanced Swift-XRT position
  20. GRB 080411: GROND detection of optical afterglow candidate
  21. GRB080330: MAGIC telescope GeV observation
  22. GRB 080411: Swift detection of a bright burst
  23. GRB 080409: Swift-BAT refined analysis
  24. GRB 080408: GROND detection of optical/NIR afterglow candidate
  25. GRB 080330 optical observations
  26. Swift/UVOT observations of GRB080409
  27. GRB 080409: Swift XRT refined analysis
  28. GRB 080409: Enhanced Swift-XRT position
  29. GRB 080409: REM optical/NIR observations
  30. GRB 080409: Swift detection of a burst
  31. GRB 080408: Analysis of AGILE Gamma-ray data
  32. GRB 080408: GRB Localization by SuperAGILE
  33. GRB 080319A: Early RAPTOR optical limits
  34. GRB 080319B: HST observations
  35. GRB 080405: Swift-BAT refined analysis
  36. GRB 080405: Swift-XRT position
  37. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  38. GRB 080325: optical upper limit
  39. GRB 080328: GAO 150cm telescope Optical Observation
  40. GRB080330: Improved Swift XRT Position
  41. GRB080328, RIMOTS optical upper limit
  42. GRB080330: Swift XRT refined analysis
  43. GRB 080330: REM optical observations
  44. GRB 080330 Swift-UVOT refined analysis
  45. GRB 080328: Suzaku WAM observation of the prompt emission
  46. GRB080330: TNT optical observations
  47. Konus-Wind observation of GRB 080328
  48. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  49. GRB080330: LOAO R-band Detection
  50. GRB 080330: GROND Observations
  51. GRB 080330A: PAIRITEL Infrared Detections
  52. GRB 080330: error in reported XRT position
  53. GRB080330 - SDSS Pre-Burst Observations
  54. GRB 080330: Liverpool Telescope Optical observations
  55. GRB 080330: Swift detection of a burst with an optical counterpart
  56. GRB 080330: TAROT Calern observatory optical detection
  57. GRB 080328: BTA optical imaging and spectroscopy
  58. GRB 080328: Swift XRT refined analysis
  59. Swift/UVOT observations of GRB080328
  60. GRB080319B, BVRcIc field calibration
  61. GRB 080328: Enhanced Swift-XRT position
  62. GRB080328: Faulkes Telescope North observations
  63. GRB 080328: Swift detection of a burst with an optical counterpart
  64. GRB 080325: Subaru detection of NIR afterglow candidate
  65. GRB080310, late-time photometry with LBT
  66. GRB080325: XRT Refined Analysis
  67. GRB 080325: GROND Observations
  68. GRB 080325: Swift/UVOT Upper Limits
  69. GRB 080325: Early observations from OSN
  70. GRB 080325: NIR afterglow candidate
  71. GRB 080319D: GROND Detection of the Optical Counterpart
  72. GRB 080325: Enhanced Swift-XRT position
  73. GRB 080325: Swift detection of a burst
  74. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  75. GRB 080319B: Spitzer Mid-infrared Observations
  76. GRB 080319C: Suzaku WAM observation of the prompt emission
  77. Radio Detection of GRB 080319B
  78. GRB 080320, Swift-BAT refined analysis
  79. GRB 080319D: GROND Observations
  80. GRB 080319B: optical upper limit
  81. GRB 080319D: optical upper limit
  82. GRB080319B: Time-Independent XRT Spectrum
  83. GRB 080319C: UVOT Observations
  84. GRB 080319B: UVOT Observations
  85. GRB 080319A: UVOT Observations
  86. GRB 080320: Swift XRT refined analysis
  87. GRB 080320: J detection with FLAMINGOS
  88. GRB 080319D: Swift XRT refined analysis
  89. GRB 080320: optical limit
  90. GRB 080320: Gemini-N optical afterglow
  91. Konus-Wind observation of GRB 080319C
  92. GRB 080319C, Swift-BAT refined analysis
  93. GRB 080320: Enhanced Swift-XRT position
  94. GRB 080320 - SDSS Pre-Burst Observations
  95. GRB 080320: Swift detection of a burst
  96. GRB 080319C - SDSS Pre-Burst Observations
  97. GRB 080319A SDSS Pre-Burst Observations
  98. GRB080319B - SDSS Pre-Burst Observations
  99. GRB 080319B: RAPTOR observations of a naked eye burst
  100. GRB 080319A: Swift-XRT Team Refined Analysis

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