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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"

593 results found.

  1. GRB 081012: Fermi GBM detection
  2. Konus-Wind observation of GRB 081001
  3. GRB 080916C: Swift XRT refined analysis
  4. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  5. Swift trigger 324362 (LS I +61 303 ?): XRT
  6. Swift trigger 324362 (LS I +61 303 ?)
  7. GLAST Burst Monitor detection of GRB 080810
  8. GRB 080727B: REM prompt observations
  9. Konus-Wind observation of GRB 080605
  10. Konus-Wind observation of GRB 080513
  11. Konus-Wind observation of GRB 080507
  12. VLA radio observations of GRB 080413A
  13. GRB080330: MAGIC telescope GeV observation
  14. GRB 080330, Swift-BAT refined analysis
  15. Konus-Wind observation of GRB 080211
  16. GRB 071028: Swift-XRT Team refined analysis
  17. Konus-Wind observation of GRB 071020
  18. GRB 071020: Swift-XRT refined analysis
  19. GRB 071020: Swift detection of a bright burst
  20. GRB 071011: Confirmation of P60 optical afterglow
  21. GRB 071011: P60 Optical Afterglow Candidate
  22. GRB 071011, Swift-BAT refined analysis
  23. GRB 071011: Optical afterglow candidate
  24. Konus-Wind observation of GRB 071006
  25. GRB 070809: The Swift evidence for the SHB nature of this burst
  26. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  27. GRB 070714A: Swift/UVOT Upper limits
  28. GRB 070714: Swift detection of a bright burst, possibly short
  29. GRB 070621: Swift detection of a burst
  30. GRB 070610: Swift-UVOT Upper Limits
  31. GRB 070429B: Swift XRT refined analysis
  32. GRB 070412: Swift detection of a burst
  33. Konus-Wind and Konus-A observations of GRB 070220
  34. GRB070208 - SDSS Pre-Burst Observations
  35. GRB 070208: Early IR detection and afterglow astrometry
  36. GRB070208: Faulkes Telescope North Afterglow Identification
  37. Retractions of previous Swift-BAT triggers
  38. Konus-Wind observation of GRB 061222A
  39. GRB061126: Optical afterglow observations from MIRO
  40. GRB 061004: Swift/XRT Astrometry Correction
  41. GRB 060729: An update on the late-time Swift observations
  42. Konus-Wind observation of GRB 060904A
  43. Konus-Wind observation of GRB 060901
  44. GRB060729: analysis of XMM-Newton observation
  45. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  46. Swift-BAT trigger 215279 is not a GRB
  47. GRB 060526: Refined analysis of the Swift-BAT burst
  48. GRB 060522: Swift detection of a burst with possible optical afterglow
  49. GRB 060306: Swift-BAT refined analysis
  50. Konus-Wind observation of bright hard GRB 060213
  51. GRB 060211B: Swift/BAT refined analysis
  52. GRB 060210: Refined analysis of the Swift-BAT burst
  53. GRB 060202: Refined analysis of the Swift-BAT burst
  54. Konus-Wind observation of GRB 060124
  55. GRB 060117: PROMPT Observations
  56. GRB 060108: Refined XRT analysis
  57. GRB 051221B: Optical Observations with Kuiper 1.54m
  58. GRB 051221B: Refined analysis of the Swift-BAT burst
  59. Konus-Wind observation of GRB 051028
  60. Konus-Wind observation of GRB 051022
  61. GRB 050906, summary of radio observations
  62. GRB 051001: Swift Detection of a Burst
  63. GRB050922C: optical observation
  64. GRB 050827: Swift-BAT refined analysis
  65. GRB 050730: WSRT Radio Observations
  66. GRB050801: Swift-BAT detection of a burst
  67. GRB 050509b: Swift XRT Position
  68. IBAS GRB Alerts 1978-1980
  69. GRB040903 - A XRF?
  70. IPN Summary of SGR1806-20 Activity in 2004
  71. IPN triangulation of GRB030413 (small error box)
  72. IPN triangulation of GRB021211B (two large error boxes)
  73. IPN triangulation of GRB020904
  74. IPN triangulation of GRB020715 (=GRB150702)
  75. IPN triangulation of GRB150702
  76. GRB020124 optical observations with RIBOTS/RIMOTS
  77. GRB010220, Radio and Optical Observations
  78. GRB010213 (HETE) TAROT observations
  79. GRB 001109: deep JHK upper limits
  80. GRB 000301A, Radio Observations
  81. BEPPOSAX GRBM Localization of GRB991226
  82. IPN localization of GRB991226
  83. Optical Observations of GRB990627
  84. BeppoSAX NFI Observation of GRB980425
  85. GRB980425 Optical Follow-up
  86. GRB980425: X-ray revised positions
  87. GRB970519, optical follow-up at Schmidt Calern
  88. BSAX Observations of GRB980425 field
  89. GRB980425 BATSE observations
  90. GRB 980425 optical observations
  91. GRB980425: optical obs.
  92. GRB980425: Radio Observations
  93. GRB 980425 optical observations

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