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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"

39449 results found.

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

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