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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"

24507 results found.

  1. GRB 130131B: CTIO 0.9-m optical upper-limits
  2. GRB 130211A: Swift-BAT refined analysis
  3. GRB 130211A: GROND detection of the afterglow
  4. GRB 130211A: Swift detection of a burst
  5. GRB 130131A: MITSuME Akeno Optical upper limits
  6. GRB 130131B: MITSuME Akeno Optical upper limits
  7. GRB 130206A: Fermi LAT Observations
  8. GRB 130206A: Fermi GBM observation
  9. GRB 130206A: XRT and UVOT follow-up observations.
  10. GRB 130206A, Swift-BAT refined analysis
  11. GRB 130206A: Swift detection of a burst
  12. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  13. GRB 130131B: IAC80 I-band observations
  14. GRB 130131A: Swift-XRT refined Analysis
  15. GRB 130131B: MITSuME Okayama optical upper limits
  16. GRB 130131A: MITSuME Okayama optical upper limits
  17. GRB 130131B: Swift-BAT refined analysis
  18. GRB 130131A: Swift-BAT refined analysis
  19. GRB 130131A - Faulkes Telescope North Observations
  20. GRB 130131A: Swift detection of a burst
  21. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  22. GRB 130127A: Fermi GBM detection
  23. Swift Trigger 547142: a probable Galactic source
  24. GRB 130122A: Swift-BAT refined analysis
  25. GRB 130122A: Xinglong optical upper limit
  26. GRB 130122A: MASTER-Net early marginal detection of the OT
  27. Short GRB 121226A: TNG observation of the host galaxy
  28. GRB 121225B: Suzaku WAM observation of the prompt emission
  29. GRB 130102B: MASTER synchronous observations
  30. Konus-Wind observation of GRB 130102B
  31. GRB 130102A: P60 Observations
  32. GRB 130102A: Swift-BAT refined analysis
  33. GRB 130102A: MASTER-Net optical observations
  34. GRB 121229A: Swift-XRT refined Analysis
  35. GRB 121229A, Swift-BAT refined analysis
  36. GRB 121229A: VLT/X-shooter redshift
  37. Swift Trigger 544381 is unlikely to be a GRB
  38. GRB 121229A: MAXI/GSC detection
  39. GRB 121229A: GROND detection of the afterglow
  40. Skynet/PROMPT observations of GRB121229a
  41. GRB 121229A: Swift detection of a burst
  42. GRB 121226A, Swift-BAT refined analysis
  43. GRB 121226A: NOT optical upper limit
  44. GRB 121226A: Optical Observations
  45. GRB 121226A: MITSuME Okayama Optical upper limits
  46. GRB 121226A: BOOTES-4/MET optical observations
  47. GRB 121226A: Swift detection of a burst
  48. Konus-Wind observation of GRB 121225B
  49. GRB 121225B: Fermi GBM observation
  50. GRB 121225B: Fermi LAT Detection
  51. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  52. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  53. GRB 121217A: Swift-BAT refined analysis
  54. GRB 121217A: Fermi GBM observation
  55. GRB 121217A: Swift-XRT refined Analysis
  56. GRB 121217A: GROND Detection of the Afterglow
  57. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  58. GRB 121209A: MAXI/GSC detection
  59. GRB121212A: NOT optical imaging
  60. GRB 121209A: Early CARMA Observations
  61. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  62. GRB 121211A: Fermi GBM observation
  63. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  64. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  65. GRB 121212A: PAIRITEL NIR Observations
  66. GRB 121212A: Swift-XRT refined Analysis
  67. GRB 121212A: P60 Observations
  68. GRB 121212A: optical observations in ISON-NM observatory
  69. GRB 121212A: Keck observations
  70. GRB 121212A: Swift-BAT refined analysis
  71. GRB 121211A: Swift-BAT refined analysis
  72. GRB 121212A: A long GRB detected by INTEGRAL
  73. GRB 121211A: MITSuME Okayama Optical Observation
  74. GRB 121211A: Swift-XRT refined Analysis
  75. GRB 121209A: Keck observations
  76. GRB 121209A: Swift-XRT refined Analysis
  77. GRB 121209A: Swift-BAT refined analysis
  78. GRB 121209A: GROND optical afterglow candidate
  79. GRB 121209A: PAIRITEL NIR Observations
  80. GRB 121209A: Swift detection of a burst
  81. GRB 121127A: Suzaku WAM observation of the prompt emission
  82. GRB 121128A: Optical Observations
  83. GRB 121122A: Suzaku WAM observation of the prompt emission
  84. GRB 121202A: Fermi GBM observation
  85. GRB 121202A: Swift-BAT refined analysis
  86. GRB 121202A: Swift detection of a burst
  87. GRB 121201A: GROND afterglow observations and photometric redshift
  88. GRB 121201A: Swift-BAT refined analysis
  89. GRB 121201A: a GRB with an optical counterpart
  90. GRB 121128A: MITSuME Akeno Optical upper limits
  91. Konus-Wind observation of GRB 121127A
  92. IPN Triangulation of GRB 121127A (short/hard)
  93. GRB 121128A: Swift-XRT refined Analysis
  94. GRB 121122A: Fermi GBM observation
  95. GRB 121128A: Fermi GBM observation
  96. GRB 121128A, Swift-BAT refined analysis
  97. Konus-Wind observation of GRB 121128A
  98. GRB 121123A: Suzaku WAM observation of the prompt emission
  99. Konus-Wind observation of GRB 121122A
  100. GRB 121117A: Terskol obseravtions

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