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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"

19866 results found.

  1. Swift XRT and UVOT observations of GRB080414
  2. GRB 080413B: Faulkes Telescope South optical afterglow observations
  3. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  4. GRB 080414: RTT150 optical observations
  5. VLA radio observations of GRB 080413B
  6. VLA radio observations of GRB 080413A
  7. GRB080413B
  8. Swift-BAT spectral lag analysis of GRB 080413B
  9. GRB 080413a, SMARTS optical/IR afterglow observations
  10. GRB 080413B: Swift XRT refined analysis
  11. GRB080413A: Swift/UVOT observations
  12. GRB080413B: REM NIR & Optical Observation
  13. GRB 080413B: GROND detection of afterglow in all bands
  14. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  15. GRB 080413A: REM detection of the NIR Afterglow
  16. GRB 080413: Enhanced Swift-XRT position
  17. GRB 080413: TAROT Calern observatory optical observations
  18. GRB 080413: Swift detection of a burst with an optical afterglow
  19. GRB 080411: Swift/UVOT refined analysis
  20. GRB 080411: Swift-XRT Refined Analysis
  21. GRB 080411: Enhanced Swift-XRT position
  22. GRB 080411: GROND detection of optical afterglow candidate
  23. GRB 080411: Swift detection of a bright burst
  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 080319A: Early RAPTOR optical limits
  32. GRB 080319B: HST observations
  33. GRB 080405: Swift-BAT refined analysis
  34. GRB 080405: Swift-XRT position
  35. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  36. GRB 080325: optical upper limit
  37. GRB 080328: GAO 150cm telescope Optical Observation
  38. GRB080330: Improved Swift XRT Position
  39. GRB080328, RIMOTS optical upper limit
  40. GRB 080330: REM optical observations
  41. GRB 080330 Swift-UVOT refined analysis
  42. GRB080330: TNT optical observations
  43. GRB 080330: GROND Observations
  44. GRB 080330A: PAIRITEL Infrared Detections
  45. GRB 080330: error in reported XRT position
  46. GRB080330 - SDSS Pre-Burst Observations
  47. GRB 080330: Swift detection of a burst with an optical counterpart
  48. GRB 080330: TAROT Calern observatory optical detection
  49. Swift/UVOT observations of GRB080328
  50. GRB080319B, BVRcIc field calibration
  51. GRB 080328: Enhanced Swift-XRT position
  52. GRB 080328: Swift detection of a burst with an optical counterpart
  53. GRB 080325: Subaru detection of NIR afterglow candidate
  54. GRB 080325: GROND Observations
  55. GRB 080325: Swift/UVOT Upper Limits
  56. GRB 080319C: Gemini-North spectroscopic redshift
  57. GRB 080325: Early observations from OSN
  58. GRB 080325: NIR afterglow candidate
  59. GRB 080319D: GROND Detection of the Optical Counterpart
  60. GRB 080325: Enhanced Swift-XRT position
  61. GRB 080325: Swift detection of a burst
  62. GRB 080319B: Spitzer Mid-infrared Observations
  63. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  64. Radio Detection of GRB 080319B
  65. GRB 080319D: GROND Observations
  66. GRB 080319B: optical upper limit
  67. GRB 080319D: optical upper limit
  68. GRB 080319D, Swift-BAT refined analysis
  69. GRB 080319C: UVOT Observations
  70. GRB 080319B: UVOT Observations
  71. GRB 080319A: UVOT Observations
  72. GRB 080320: Swift XRT refined analysis
  73. GRB 080320: J detection with FLAMINGOS
  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. Konus-Wind observation of GRB 080319B
  79. GRB 080320: Enhanced Swift-XRT position
  80. GRB 080320 - SDSS Pre-Burst Observations
  81. GRB 080320: Swift detection of a burst
  82. GRB 080319C - SDSS Pre-Burst Observations
  83. GRB 080319A SDSS Pre-Burst Observations
  84. GRB080319B - SDSS Pre-Burst Observations
  85. GRB 080319C: Swift-XRT Team Refined Analysis
  86. GRB 080319B: Swift-XRT Team Refined Analysis
  87. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  88. GRB 080319C: AGILE-MCAL observation of the prompt emission
  89. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  90. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  91. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  92. GRB 080319B: TORTORA synchronous observation
  93. GRB 080319B: Enhanced Swift-XRT position
  94. GRB 080319A: Enhanced Swift-XRT position
  95. GRB 080319C: Swift detection of a burst with an optical afterglow
  96. GRB 080319A: REM observations
  97. GRB 080319B: Change in power law decay index
  98. GRB 080319A: optical observations at the NOT
  99. GRB 080319B: REM observations
  100. GRB080319A: P60 Optical Afterglow Observations

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