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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"

37645 results found.

  1. GRB 060923C: Swift detection of a burst
  2. GRB 060923B: Swift detection of a burst
  3. GRB 060923, Swift-BAT refined analysis
  4. GRB 060923: Early Super-LOTIS Observations
  5. GRB 060923: UKIRT nIR observations - candidate afterglow
  6. GRB060923 - SDSS Pre-Burst Observations
  7. GRB 060923: KAIT observations
  8. GRB 060923: Swift detection of a burst
  9. Swift detection of IGR J17497-2821 (trigger 230504)
  10. GRB 060919 : Faulkes South Telescope Observations
  11. GRB 060919, Swift-BAT refined analysis
  12. GRB060919: XRT refined analysis
  13. GRB 060919: TAROT optical observations
  14. GRB 060919: Swift detection of a burst
  15. GRB 060912A: VLA Observation
  16. GRB 060912A: Probable Host Galaxy
  17. IBAS Alert n.3470: not a GRB
  18. GRB060825: MAGIC telescope GeV observation
  19. Konus-Wind observation of GRB 060912
  20. IBAS Alert No.3468: not a GRB
  21. GRB 060912: Redshift of nearby 2MASS galaxy
  22. GRB060912: optical observations
  23. GRB 060912B: Watcher observations
  24. GRB060912: OPTIMA-Burst optical observations
  25. GRB 060912B: a long GRB detected with INTEGRAL
  26. GRB 060912: Swift XRT Team Refined Analysis
  27. GRB 060912, Swift-BAT refined analysis
  28. GRB 060912: Correction to GCN 5559
  29. GRB 060912: Xinglong TNT optical observations
  30. GRB 060912: Swift detection of a burst with an optical afterglow
  31. VLA observations of GRB 060908
  32. GRB 060908: redshift
  33. GRB 060908, Swift/XRT refined analysis
  34. GRB 060908: Swift/UVOT Observations
  35. GRB 060908: Danish/DFOSC optical observations
  36. GRB 060908, Swift-BAT refined analysis
  37. GRB 060908 - SDSS Pre-burst Observations
  38. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  39. GRB 060904B: Kiso Optical observation
  40. GRB 060904A : Optical limit
  41. GRB 060908: REM optical prompt observation
  42. GRB 060908: PROMPT Detection of a Bright Counterpart
  43. GRB 060908: Swift detection of a burst with a bright optical counterpart
  44. GRB 060904A: Suzaku/WAM observation of the prompt emission
  45. GRB 060906: optical observation
  46. GRB 060906: Early RAPTOR optical limits
  47. GRB 060906, Swift-BAT refined spectral analysis
  48. GRB 060906: Swift/XRT Refined Analysis
  49. GRB 060906: Swift-UVOT observations
  50. VLT redshift of GRB 060906
  51. GRB 060906, Swift-BAT refined analysis
  52. GRB 060906: FRAM observations - flash determination (airplane)
  53. GRB 060906: KAIT observations
  54. GRB 060906: Confirmation of P60 Optical Afterglow
  55. GRB 060906: observations with FRAM
  56. GRB 060906 (?): P60 Optical Afterglow Candidate
  57. GRB 060906: Swift detection of a probable burst
  58. GRB 060904A Milagro GeV/TeV Observations
  59. GRB060904b, optical observations
  60. GRB 060904b: SMARTS optical/IR afterglow observations
  61. GRB 060904B: RTT150 optical observations
  62. GRB060904A: Swift/UVOT optical observations
  63. GRB 060904A: Subaru NIR observation
  64. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  65. GRB 060904B: Swift-BAT refined analysis
  66. Konus-Wind observation of GRB 060904A
  67. GRB 060904B: Swift-XRT refined analysis
  68. GRB 060904A: Refined analysis of the Swift-BAT burst
  69. GRB 060904A: Swift-XRT refined analysis
  70. GRB 060904A: Suzaku-XIS and -HXD observation plan
  71. GRB 060904B: VLT redshift
  72. GRB 060904A: P60 Observations
  73. GRB 060904B: Optical observations at Crni Vrh
  74. GRB060904B: Watcher observations
  75. GRB 060904B BOOTES-IR and 1.5m OSN observations
  76. GRB 060904B: TAROT optical counterpart observations
  77. GRB060904B - SDSS Pre-Burst Observations
  78. GRB 060904: TAROT optical observations
  79. GRB 060904B: Swift detection of a burst with optical counterpart
  80. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  81. GRB060904 - SDSS Pre-Burst Observations
  82. GRB 060904: Swift detection of a bright burst
  83. GRB 060901: pseudo-z from spectral parameters of the prompt
  84. Konus-Wind observation of GRB 060901
  85. GRB 060901: SMARTS optical/IR observations update
  86. GRB 060901: Swift/XRT Refined Analysis
  87. GRB 060901: SMARTS optical/IR observations
  88. GRB 060901: Swift/XRT Position
  89. GRB 060901: further INTEGRAL results
  90. GRB 060901: Watcher observations
  91. GRB 060901: a long GRB detected by INTEGRAL
  92. GRB 060605, observations using an Integral Field Unit
  93. GRB 060604: VLA Observation
  94. GRB 060814: Suzaku/WAM observation of the prompt emission
  95. GRB 060605: VLA Observation
  96. GRB 060707: VLA observation
  97. GRB 060825: VLA observations
  98. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  99. Swift-BAT trigger 226614 is not a GRB
  100. GRB060826 - SDSS Pre-Burst Observations

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