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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"

19197 results found.

  1. GRB 080328: BTA optical imaging and spectroscopy
  2. GRB 080328, Swift-BAT refined analysis
  3. GRB 080328: Swift XRT refined analysis
  4. GRB 080325, Swift-BAT refined analysis
  5. Swift/UVOT observations of GRB080328
  6. GRB 080328: Enhanced Swift-XRT position
  7. GRB080328: Faulkes Telescope North observations
  8. GRB 080328: Swift detection of a burst with an optical counterpart
  9. GRB 080325: Subaru detection of NIR afterglow candidate
  10. GRB080325: XRT Refined Analysis
  11. GRB 080325: GROND Observations
  12. GRB 080325: Swift/UVOT Upper Limits
  13. GRB 080319D: GROND Detection of the Optical Counterpart
  14. GRB 080325: Enhanced Swift-XRT position
  15. GRB 080325: Swift detection of a burst
  16. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  17. GRB 080319C: Suzaku WAM observation of the prompt emission
  18. GRB 080320, Swift-BAT refined analysis
  19. GRB 080319D: GROND Observations
  20. GRB 080319D, Swift-BAT refined analysis
  21. GRB 080319C: UVOT Observations
  22. GRB 080319B: UVOT Observations
  23. GRB 080319A: UVOT Observations
  24. GRB 080320: Swift XRT refined analysis
  25. GRB 080320: Early Super-LOTIS Observations
  26. GRB 080319D: Swift XRT refined analysis
  27. Konus-Wind observation of GRB 080319C
  28. GRB 080319C, Swift-BAT refined analysis
  29. Konus-Wind observation of GRB 080319B
  30. GRB 080320: Enhanced Swift-XRT position
  31. GRB 080319C: Early RAPTOR Observations
  32. GRB 080319B: second epoch imaging from Canarias (correction to GCN7469)
  33. GRB 080320 - SDSS Pre-Burst Observations
  34. GRB 080320: Swift detection of a burst
  35. GRB 080320: ROTSE-III Optical Limits
  36. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  37. GRB 080319B: optical observations
  38. Swift-BAT trigger 306829 is IGR J16479-4514
  39. GRB 080319B: RAPTOR observations of a naked eye burst
  40. GRB 080319A: Swift-XRT Team Refined Analysis
  41. GRB 080319B, Swift-BAT refined analysis
  42. GRB 080319C: Swift-XRT Team Refined Analysis
  43. GRB 080319B: Swift-XRT Team Refined Analysis
  44. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  45. GRB 080319C: AGILE-MCAL observation of the prompt emission
  46. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  47. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  48. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  49. GRB 080319B: TORTORA synchronous observation
  50. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  51. GRB 080319B: Enhanced Swift-XRT position
  52. GRB 080319A: Enhanced Swift-XRT position
  53. GRB 080319A, Swift-BAT refined analysis
  54. GRB 080319C: Early Super-LOTIS Observations
  55. GRB 080319C: Swift detection of a burst with an optical afterglow
  56. GRB 080319C: KAIT OA candidate
  57. GRB 080319b prompt optical observation by Pi-of-the-Sky
  58. GRB 080319B: Gemini-South Spectroscopy
  59. GRB080319B Liverpool Telescope optical afterglow candidate
  60. GRB 080319B: Super-LOTIS Detection of a Bright OT
  61. GRB 080319B: KAIT OA
  62. GRB 080319B: UVOT Position
  63. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  64. GRB 080319A: Swift detection of a burst
  65. Swift Trigger 306745 is not a GRB
  66. Swift Trigger 306616 is not a GRB
  67. Swift/UVOT observations of GRB 080315
  68. Swift trigger 306323: Swift-BAT/XRT refined analysis
  69. SAX J1818.6-1703: Swift detection (trigger 306379)
  70. GRB 080315: TAROT Calern observatory optical observations
  71. GRB 080315: Swift detection of a possible burst
  72. GRB 080310: ROTSE-III Observations of Optical Counterpart
  73. GRB 080310, Swift-BAT refined analysis
  74. GRB 080310: Swift-XRT refined analysis
  75. GRB 080310: Swift/UVOT Refined Analysis
  76. GRB 080310 - SDSS Pre-Burst Observations
  77. GRB 080310: Enhanced Swift-XRT position
  78. GRB 080310: VLT/UVES spectroscopy
  79. GRB080310: Super-LOTIS suggestion of brightening
  80. GRB 080310: Swift detection of a burst with optical afterglow
  81. GRB080229, optical upper limit (Correction)
  82. GRB080307, optical upper limit
  83. GRB080229, optical upper limit
  84. GRB 080307: Swift-XRT Team refined analysis
  85. GRB 080307: Swift/UVOT Upper Limits
  86. GRB 080307: Early RAPTOR Limits
  87. GRB 080307, Swift-BAT refined analysis
  88. GRB080307 - SDSS Pre-Burst Observations
  89. GRB 080307: retraction of UVOT candidate
  90. GRB 080307: Enhanced Swift-XRT position
  91. GRB 080307, Preliminary Swift-BAT refined analysis
  92. GRB 080307: Swift detection of a burst
  93. VLA possible radio detection of GRB 080229
  94. GRB 080303: Swift/UVOT follow-up of afterglow detection
  95. GRB 080303, Swift-BAT refined analysis
  96. GRB080303: Swift XRT refined analysis
  97. GRB 080303: Enhanced Swift-XRT position
  98. Swift UVOT observations of GRB080229B
  99. GRB080229B: Swift XRT afterglow observation
  100. GRB 080303A: Faulkes Telescope South optical afterglow observations

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