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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19665 results found.

  1. GRB 120802A: MASTER optical observations
  2. GRB 120802A: Swift detection of a burst
  3. GRB 120729A: RTT150 optical observations
  4. GRB 120729A: EVLA Observations
  5. GRB 120729A: Early RAPTOR Observations
  6. GRB 120728A: GROND Afterglow discovery
  7. GRB 120729A: Swift-XRT refined Analysis
  8. Correction to Swift GCN Circular 13538
  9. GRB 120729A: Swift/UVOT Detection
  10. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  11. GRB 120729A, Swift-BAT refined analysis
  12. GRB 120728A, Swift-BAT refined analysis
  13. GRB 120729A: Enhanced Swift-XRT position
  14. GRB 120728A: Swift/UVOT Upper Limits
  15. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  16. GRB 120729A: Swift detection of a burst with an optical afterglow
  17. GRB 120728A: Swift-XRT refined Analysis
  18. GRB 120728A: Enhanced Swift-XRT position
  19. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  20. GRB 120728A: GROND observations
  21. GRB 120728A: Swift detection of a burst
  22. Swift Trigger 528925 is probably a noise fluctuation
  23. GRB 120722A: optical upper limit
  24. GRB 120724A: optical observation in Maidanak observatory
  25. GRB 120724A, Swift-BAT refined analysis
  26. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  27. GRB 120724A: Enhanced Swift-XRT position
  28. GRB 120724A: Swift-XRT refined Analysis
  29. GRB 120724A: Swift detection of a burst
  30. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  31. GRB 120722A: Swift/UVOT Upper Limits
  32. GRB 120722A: GROND detection of the afterglow
  33. GRB 120722A: Swift-XRT refined Analysis
  34. GRB 120722A: Swift-BAT refined analysis
  35. GRB 120722A: Enhanced Swift-XRT position
  36. GRB 120722A: Swift detection of a burst
  37. GRB 120716A: EVLA Detection
  38. GRB 120716A: Swift-XRT detection
  39. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  40. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  41. GRB 120714B: Swift/UVOT Detection
  42. GRB 120714B: Swift-XRT refined Analysis
  43. GRB120714A: Swift/UVOT upper limits
  44. GRB 120714B: Swift-BAT refined analysis
  45. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  46. GRB 120714A: GROND upper limits
  47. GRB 120714B: GROND confirmation of fading afterglow
  48. GRB 120714A: Swift-XRT refined Analysis
  49. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  50. GRB 120714B: Position Correction and Candidate Optical Afterglow
  51. GRB 120714A: Swift-BAT refined analysis
  52. GRB 120714B: Swift detection of a burst
  53. GRB 120714A: Enhanced Swift-XRT position
  54. GRB 120712A: Fermi GBM observation
  55. GRB120714A: UVOT non-detection
  56. GRB 120714A: Swift-XRT observations
  57. GRB 120714A: Swift detection of a burst
  58. IPN Triangulation of GRB 120709A
  59. GRB 120712A: Swift/UVOT Detection
  60. GRB 120712A: Swift-XRT refined Analysis
  61. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  62. GRB 120712A: Enhanced Swift-XRT position
  63. GRB 120712A: Swift-BAT refined analysis
  64. GRB 120712A: Swift detection of a burst with optical afterglow
  65. GRB 120711B: Swift-XRT refined Analysis
  66. GRB 120711B: Swift-BAT refined analysis
  67. GRB 120711B: Swift/UVOT Upper Limits
  68. GRB 120711A: Swift/UVOT Observations
  69. GRB 120709A: Swift/UVOT Observations
  70. GRB 120711A: Fermi LAT detection
  71. GRB 120711A: Swift-XRT observations
  72. Swift detection of GRB 120711B or a new Galactic transient
  73. GRB 120709A: Swift-XRT observations
  74. IPN Triangulation of GRB 120707A
  75. GRB 120709A: Fermi-LAT Detection
  76. GRB 120703A: Swift/UVOT Detection
  77. GRB 120703A: Fermi GBM detection
  78. GRB 120703A: Swift-XRT refined Analysis
  79. GRB 120703A: Enhanced Swift-XRT position
  80. GRB 120703A: Swift-BAT refined analysis
  81. GRB 120624B Suzaku WAM observation of the prompt emission
  82. Konus-Wind observation of GRB 120703A
  83. GRB 120701A: Swift/UVOT Detection
  84. GRB 120701A: GROND detection of the afterglow
  85. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  86. Swift Trigger 525554 is noise
  87. GRB 120701A: Swift-XRT afterglow detection and analysis
  88. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  89. GRB 120701A: Swift-BAT refined analysis
  90. GRB 120630A: NOT optical source within the XRT error circle
  91. Swift Trigger 525554 is probably not a GRB
  92. GRB120624B: Chandra observations and afterglow detection
  93. GRB 120624B Further Swift-XRT analysis
  94. GRB 120624B: Swift/UVOT Upper Limits
  95. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  96. GRB 120624B: Swift-XRT observations
  97. GRB 120624B: GROND upper limits
  98. GRB 120624B: NIR counterpart candidate from HAWKI
  99. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  100. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations

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