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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"

42885 results found.

  1. GRB 130131A - UKIRT confirmation of afterglow
  2. GRB 130131B: VLT/X-shooter acquisition camera limits
  3. GRB 130131B: GROND Upper limits
  4. GRB 130131A: CARMA 3mm Observations
  5. GRB 130131A: VLA 5.8 Ghz Detection
  6. GRB 130131B: IAC80 I-band observations
  7. GRB 130131A: Swift-XRT refined Analysis
  8. GRB 130131B: Enhanced Swift-XRT position
  9. GRB 130131B: Swift-BAT refined analysis
  10. GRB 130131A: Swift-BAT refined analysis
  11. GRB 130131B: TAROT Calern observatory optical observations
  12. GRB 130131B: Zadko observatory - Gingin optical observations
  13. GRB 130131A: Enhanced Swift-XRT position
  14. GRB 130131B: Swift detection of a burst
  15. GRB 130131A - Faulkes Telescope North Observations
  16. GRB 130131A - UKIRT afterglow candidate
  17. GRB 130131A: Swift detection of a burst
  18. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  19. GRB 130127A: Fermi GBM detection
  20. Swift Trigger 547142: MAXI/GSC upper limit
  21. GRB 130122A: RTT150 optical observations
  22. Swift Trigger 547142: a probable Galactic source
  23. GRB 130122A: CARMA 3mm Observations
  24. GRB 130122A: Swift/UVOT Detection
  25. GRB 130122A: optical observations
  26. GRB 130122A: RATIR Detection
  27. GRB 130122A: Swift-BAT refined analysis
  28. GRB 130122A: Swift-XRT refined Analysis
  29. GRB 130122A: Xinglong optical upper limit
  30. GRB 130122A: Enhanced Swift-XRT position
  31. GRB 130122A: MASTER-Net early marginal detection of the OT
  32. GRB 130122A: T100 observations
  33. GRB 130122A: Swift detection of a burst with an optical counterpart
  34. Short GRB 121226A: TNG observation of the host galaxy
  35. GRB 121225B: Suzaku WAM observation of the prompt emission
  36. GRB 130102B: MASTER synchronous observations
  37. GRB 130102A: Swift/UVOT Upper Limits
  38. Konus-Wind observation of GRB 130102B
  39. GRB 130102A: P60 Observations
  40. GRB 130102A: Swift-BAT refined analysis
  41. GRB 130102A: MASTER-Net optical observations
  42. GRB 130102A: Swift-XRT refined Analysis
  43. GRB 130102B: MAXI/GSC detection
  44. GRB 130102A: Enhanced Swift-XRT position
  45. GRB 130102A: IAC80 I-band observations
  46. GRB 130102A: Swift detection of a burst
  47. GRB 121226A: 5.8 GHz VLA observations
  48. Swift Trigger 544381 is a noise event
  49. GRB 121229A: Swift-XRT refined Analysis
  50. GRB 121229A, Swift-BAT refined analysis
  51. GRB 121229A: Enhanced Swift-XRT position
  52. GRB 121229A: VLT/X-shooter redshift
  53. Swift Trigger 544381 is unlikely to be a GRB
  54. GRB 121229A: MAXI/GSC detection
  55. GRB 121229A: GROND detection of the afterglow
  56. Skynet/PROMPT observations of GRB121229a
  57. GRB 121229A: Swift detection of a burst
  58. GRB 121226A: 10.4m GTC optical observations
  59. GRB 121226A: Swift/UVOT Upper Limits
  60. GRB 121226A: Swift-XRT refined Analysis
  61. GRB 121226A, Swift-BAT refined analysis
  62. GRB 121226A: NOT optical upper limit
  63. GRB 121226A: Zadko observatory - Gingin optical observations
  64. GRB 121226A: BOOTES-4/MET optical observations
  65. GRB 121226A: Swift detection of a burst
  66. Konus-Wind observation of GRB 121225B
  67. IPN Triangulation of GRB 121225B
  68. GRB 121225B: Fermi GBM observation
  69. GRB 121225B: Fermi LAT Detection
  70. GRB 121225A: MAXI/GSC detection
  71. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  72. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  73. GRB 121217A: ATCA 44GHz upper limit
  74. GRB 121217A: Swift-BAT refined analysis
  75. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  76. GRB 121217A: Fermi GBM observation
  77. GRB 121217A: Swift-XRT refined Analysis
  78. GRB 121217A: Swift/UVOT Detection
  79. GRB 121217A: GROND Detection of the Afterglow
  80. GRB 121217A: Enhanced Swift-XRT position
  81. GRB 121217A: Swift detection of a burst
  82. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  83. GRB 121209A: LOAO Observation
  84. GRB 121209A: Swift/UVOT Upper Limits
  85. GRB 121209A: MAXI/GSC detection
  86. GRB 121212A: PdBI mm observations
  87. GRB121212A: NOT optical imaging
  88. GRB 121209A: Early CARMA Observations
  89. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  90. GRB 121212A: Maidanak optical observations
  91. GRB 121211A: Fermi GBM observation
  92. GRB 121211A: RATIR Optical and NIR Observations
  93. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  94. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  95. GRB 121212A: PAIRITEL NIR Observations
  96. GRB 121212A: Swift-XRT refined Analysis
  97. GRB 121212A: P60 Observations
  98. GRB 121212A: optical observations in ISON-NM observatory
  99. GRB 121212A: Keck observations
  100. GRB121212A: Swift/UVOT Detection

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