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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"

19662 results found.

  1. GRB 110625A: Swift/UVOT Upper Limits
  2. GRB 110625A: Fermi LAT detection
  3. GRB 110625A: GROND detection of a source inside the XRT error circle
  4. GRB 110625A: Konkoly observations
  5. Konus-Wind observation of GRB 110625A
  6. GRB 110625A: Swift-XRT refined Analysis
  7. GRB 110625A: Swift-BAT refined analysis
  8. Swift J185003.2-005627: NIR Observation
  9. GRB 110625A: ROTSE-III Optical Limits
  10. GRB 110625A: Swift detection of a burst
  11. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  12. Swift J185003.2-005627: Swift-BAT refined analysis
  13. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  14. Swift J185003.2-005627: TAROT Calern observatory optical observations
  15. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  16. SGR 1E 1841-045: Swift-BAT refined analysis
  17. GRB 110604A: final update on Swift-XRT observations
  18. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  19. IPN triangulation of GRB110618A (long duration, extremely intense)
  20. GRB 110604A: Suzaku WAM observation of the prompt emission
  21. GRB 110610A: Suzaku WAM observation of the prompt emission
  22. GRB 110610A: Fermi GBM detection
  23. GRB 110610A: 1.23m CAHA optical observations
  24. GRB 110610A: Swift-XRT refined Analysis
  25. GRB 110610A: Swift/UVOT Upper Limits
  26. GRB 110610A: Enhanced Swift-XRT position
  27. GRB 110610A: Swift-BAT refined analysis
  28. Swift detection of the X-ray afterglow of GRB 110604A
  29. GRB 110610A: MASTER-NET optical observations
  30. GRB 110610A: Swift detection of a burst
  31. Konus-Wind observation of GRB 110604A
  32. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  33. GRB 110530A: optical observations in Mondy observatory
  34. GRB 110530A: optical observations at Mt. Terskol, second epoch
  35. GRB 110530A: Swift-XRT refined Analysis
  36. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  37. GRB 110530A: Enhanced Swift-XRT position
  38. GRB 110530A: optical observations at Mt. Terskol
  39. GRB 110530A: MASTER OT observations
  40. GRB 110530A: Swift-BAT refined analysis
  41. GRB 110530A: Swift detection of a burst with an optical afterglow
  42. EVLA afterglow limits on the high z GRB090429B
  43. Swift J1644+57/GRB 110328A, Additional HST Observations
  44. GRB 110521A: MASTER prompt optical limit
  45. GRB 110521A: Swift/UVOT Upper Limits
  46. GRB 110521A: Swift-XRT refined analysis
  47. GRB 110521A: Swift-BAT refined analysis
  48. GRB 110521A: Enhanced Swift-XRT position
  49. GRB 110521A: MASTER synchronous and early optical observations limit
  50. Swift/UVOT observations of GRB110520A
  51. GRB 110521A: Swift detection of a burst
  52. GRB 110520A: Swift-BAT refined analysis
  53. GRB 110520A: Swift-XRT refined Analysis
  54. GRB 110520A: Enhanced Swift-XRT position
  55. GRB 110520A: Skynet/DAO optical observations
  56. GRB 110520A: Liverpool Telescope Observations
  57. GRB 110520A: TAROT Calern observatory optical observations
  58. GRB 110520A: MASTER-NET optical observations
  59. GRB 110520A: Swift detection of a burst
  60. IPN localization of bright GRB 110518A
  61. GRB 110519A, Swift-BAT refined analysis
  62. GRB 110519A: Swift detection of a burst
  63. GRB 110503A optical observation
  64. GRB 110428A: Fermi-GBM observation
  65. GRB 110503A: TAROT Calern observatory optical observations
  66. GRB 110503A optical observations
  67. Konus-Wind observation of GRB 110503A
  68. GRB 110503A: Centimeter observation from EVLA
  69. GRB 110503A: Swift/UVOT Observations
  70. GRB 110503A: Swift-XRT refined Analysis
  71. GRB 110503A: PAIRITEL NIR Detection
  72. GRB 110503A: Swift-BAT refined analysis
  73. GRB 110503A: Enhanced Swift-XRT position
  74. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  75. GRB 110426A: Swift/XRT non-detection
  76. GRB 110428A : X-ray afterglow confirmation
  77. GRB 110428A: Suzaku WAM observation of the prompt emission
  78. GRB 110422A: optical observations in CrAO
  79. GRB 110428A : Swift-XRT observations
  80. GRB 110422A: optical observations in CrAO, second epoch
  81. GRB 110422A: Suzaku WAM observation of the prompt emission
  82. GRB 110422A: optical observations in CrAO
  83. Konus-Wind observation of GRB 110422A
  84. GRB 110422A: Swift/UVOT Detection of optical afterglow
  85. GRB 110422A: Swift-XRT refined Analysis
  86. GRB 110422A: Enhanced Swift-XRT position
  87. GRB 110422A: MASTER earlier OT polarization observations
  88. GRB 110422A: Swift-BAT refined analysis
  89. GRB 110422A: Swift detection of a burst
  90. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  91. GRB 110420B: Swift/UVOT Upper Limits
  92. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  93. GRB 110420B: Swift-XRT afterglow candidate retraction
  94. GRB 110420B: Fermi GBM observation
  95. Konus-Wind observation of GRB 110420A
  96. GRB 110420B: Spectral lag indicates short hard burst
  97. GRB 110420B, GROND observations
  98. GRB 110420A Swift/UVOT Observations
  99. GRB 110420B: Swift-XRT afterglow candidate
  100. GRB 110420B: Swift-BAT refined analysis

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