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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"

2707 results found.

  1. GRB 080822 (SGR 0501+4516): archival optical observations
  2. GRB 080810: KANATA optical-NIR observation, update
  3. GRB080804: Gemini South redshift confirmation
  4. GRB 080805: GROND detection of possible afterglow
  5. GRB 080727A: Swift-XRT refined analysis
  6. Retraction of Swift Trigger 317393
  7. Trigger 317393: Swift detection of a possible GRB
  8. GRB 080710: TLS observations, steepening afterglow decay
  9. GRB 080707: possible break in the X-rays
  10. Trigger 315630: Swift detection of a possible burst
  11. GRB 080701: Swift detection of a burst
  12. Swift-BAT trigger 314975 possible burst
  13. GRB 070809: Putative host galaxy and redshift
  14. Swift observations of BAT Slew Survey event (Trigger=010)
  15. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  16. GRB 080604, Swift-BAT refined analysis
  17. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  18. GRB 080602: Swift detection of a burst
  19. GRB 080523, Swift-BAT refined analysis
  20. GRB 080523: Swift detection of a burst
  21. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  22. GRB 080515: Swift-XRT position and analysis
  23. GRB 080517, Swift-BAT refined analysis
  24. GRB 080517: Swift detection of a burst
  25. GRB 080514B: possible AGILE detection at E>50 MeV
  26. Swift detection of a possible galactic transient
  27. GRB 080507: E Pur Si Muove!
  28. GRB 080503: Hubble Space Telescope Imaging
  29. GRB 080507: Swift-XRT position of a possible afterglow
  30. GRB 080506: TLS 2nd Epoch - possible light curve break
  31. GRB 080506, Swift-BAT refined analysis
  32. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  33. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  34. GRB 080503: New candidate afterglow/host in Gemini imaging
  35. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  36. GRB 080430: Swift detection of a burst with optical afterglow
  37. GRB080426: Observations from CAHA
  38. Possible GRB 080315: XRT non-detection of afterglow
  39. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  40. GRB 080420?: Swift detection of a possible short burst
  41. GRB 080413A: Suzaku WAM observation of the prompt emission
  42. Swift-BAT spectral lag analysis of GRB 080413B
  43. GRB 080413: Swift detection of a burst with an optical afterglow
  44. GRB 080408: Swift-XRT position of a possible afterglow
  45. GRB 080409: Swift detection of a burst
  46. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  47. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  48. GRB 080330: REM optical observations
  49. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  50. GRB080319B: optical observations
  51. GRB 080325: Swift detection of a burst
  52. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  53. GRB 080320, Swift-BAT refined analysis
  54. GRB080319B: Time-Independent XRT Spectrum
  55. GRB 080319B: Swift-XRT Team Refined Analysis
  56. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  57. GRB080319B Liverpool Telescope optical afterglow candidate
  58. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  59. GRB 080319A: Swift detection of a burst
  60. Swift trigger 306323: Swift-BAT/XRT refined analysis
  61. GRB 080315: Swift detection of a possible burst
  62. GRB 080310, Swift-BAT refined analysis
  63. GRB 080310: Swift detection of a burst with optical afterglow
  64. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  65. GRB 080307, Swift-BAT refined analysis
  66. GRB 080307, Preliminary Swift-BAT refined analysis
  67. GRB 080307: Swift detection of a burst
  68. VLA possible radio detection of GRB 080229
  69. GRB080229: Possible optical afterglow
  70. GRB 080212: REM refined analysis
  71. GRB 080210: GOND detection in all bands and redshift upper limit
  72. GRB 080130: further Swift XRT observations confirm fading source
  73. Swift/UVOT observations of GRB080130
  74. GRB 080130(?): Swift XRT observation
  75. GRB 080130?: Detection of a possible burst by BATSS
  76. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  77. GRB 080129: Gemini-South photometry
  78. GRB 080129: Swift XRT position
  79. GRB 080129 (?): UVOT Upper Limits
  80. GRB 080129 (?): Swift detection of a possible burst
  81. IPN triangulation of GRB080122
  82. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  83. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  84. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  85. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  86. Further Swift-BAT analysis of GRB 071227
  87. GRB 071227: Swift-XRT refined analysis
  88. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  89. GRB 071208?: Swift detection of a possible burst
  90. GRB 071129, Swift-BAT refined analysis
  91. Disregard the "GRB 071126" position
  92. GRB 071118, Swift-BAT refined analysis
  93. GRB 071112: Swift detection of a possible burst
  94. Swift/UVOT initial analysis of GRB071109
  95. GRB 071109: further Swift-XRT analysis
  96. GRB 071109: Swift-XRT possible X-ray counterpart
  97. GRB 071104: Swift-XRT Team Refined Analysis
  98. GRB 071104: Possible Swift UVOT Afterglow Candidate
  99. GRB 071028: Swift detection of a burst
  100. GRB 071025: ROTSE-III Refined Analysis

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