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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"

2803 results found.

  1. GRB 080727A: Swift-XRT refined analysis
  2. Retraction of Swift Trigger 317393
  3. Trigger 317393: Swift detection of a possible GRB
  4. GRB 080710: TLS observations, steepening afterglow decay
  5. GRB 080707: possible break in the X-rays
  6. Trigger 315630: Swift detection of a possible burst
  7. GRB 080701: Swift detection of a burst
  8. Swift-BAT trigger 314975 possible burst
  9. GRB 070809: Putative host galaxy and redshift
  10. Swift observations of BAT Slew Survey event (Trigger=010)
  11. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  12. GRB 080604, Swift-BAT refined analysis
  13. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  14. GRB 080602: Swift detection of a burst
  15. GRB 080523, Swift-BAT refined analysis
  16. GRB 080523: Swift detection of a burst
  17. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  18. GRB 080515: Swift-XRT position and analysis
  19. GRB 080517, Swift-BAT refined analysis
  20. GRB 080517: Swift detection of a burst
  21. GRB 080514B: possible AGILE detection at E>50 MeV
  22. Swift detection of a possible galactic transient
  23. GRB 080507: E Pur Si Muove!
  24. GRB 080503: Hubble Space Telescope Imaging
  25. GRB 080507: Swift-XRT position of a possible afterglow
  26. GRB 080506: TLS 2nd Epoch - possible light curve break
  27. GRB 080506, Swift-BAT refined analysis
  28. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  29. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  30. GRB 080503: New candidate afterglow/host in Gemini imaging
  31. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  32. GRB 080430: Swift detection of a burst with optical afterglow
  33. GRB080426: Observations from CAHA
  34. Possible GRB 080315: XRT non-detection of afterglow
  35. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  36. GRB 080420?: Swift detection of a possible short burst
  37. GRB 080413A: Suzaku WAM observation of the prompt emission
  38. Swift-BAT spectral lag analysis of GRB 080413B
  39. GRB 080413: Swift detection of a burst with an optical afterglow
  40. GRB 080408: Swift-XRT position of a possible afterglow
  41. GRB 080409: Swift detection of a burst
  42. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  43. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  44. GRB 080330: REM optical observations
  45. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  46. GRB080319B: optical observations
  47. GRB 080325: Swift detection of a burst
  48. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  49. GRB 080320, Swift-BAT refined analysis
  50. GRB080319B: Time-Independent XRT Spectrum
  51. GRB 080319B: Swift-XRT Team Refined Analysis
  52. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  53. GRB080319B Liverpool Telescope optical afterglow candidate
  54. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  55. GRB 080319A: Swift detection of a burst
  56. Swift trigger 306323: Swift-BAT/XRT refined analysis
  57. GRB 080315: Swift detection of a possible burst
  58. GRB 080310, Swift-BAT refined analysis
  59. GRB 080310: Swift detection of a burst with optical afterglow
  60. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  61. GRB 080307, Swift-BAT refined analysis
  62. GRB 080307, Preliminary Swift-BAT refined analysis
  63. GRB 080307: Swift detection of a burst
  64. VLA possible radio detection of GRB 080229
  65. GRB080229: Possible optical afterglow
  66. GRB 080212: REM refined analysis
  67. GRB 080210: GOND detection in all bands and redshift upper limit
  68. GRB 080130: further Swift XRT observations confirm fading source
  69. Swift/UVOT observations of GRB080130
  70. GRB 080130(?): Swift XRT observation
  71. GRB 080130?: Detection of a possible burst by BATSS
  72. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  73. GRB 080129: Gemini-South photometry
  74. GRB 080129: Swift XRT position
  75. GRB 080129 (?): UVOT Upper Limits
  76. GRB 080129 (?): Swift detection of a possible burst
  77. IPN triangulation of GRB080122
  78. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  79. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  80. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  81. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  82. Further Swift-BAT analysis of GRB 071227
  83. GRB 071227: Swift-XRT refined analysis
  84. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  85. GRB 071208?: Swift detection of a possible burst
  86. GRB 071129, Swift-BAT refined analysis
  87. Disregard the "GRB 071126" position
  88. GRB 071118, Swift-BAT refined analysis
  89. GRB 071112: Swift detection of a possible burst
  90. Swift/UVOT initial analysis of GRB071109
  91. GRB 071109: further Swift-XRT analysis
  92. GRB 071109: Swift-XRT possible X-ray counterpart
  93. GRB 071104: Swift-XRT Team Refined Analysis
  94. GRB 071104: Possible Swift UVOT Afterglow Candidate
  95. GRB 071028: Swift detection of a burst
  96. GRB 071025: ROTSE-III Refined Analysis
  97. Possible radio detection of GRB 071021 with the VLA
  98. GRB 071021: possible high-z burst
  99. GRB071018: Correction to the title of the GCN 6936
  100. GRB 071018: Possible OT from Xinglong TNT observation

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