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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20456 results found.

  1. GRB 130216A: possible early detection at 15 GHz
  2. GRB 130216B: P200 NIR Observations
  3. GRB 130216A: P200 NIR Observations
  4. GRB 130216A: TAROT La Silla observatory optical observations
  5. GRB 130215A: Additional P200 NIR observations
  6. GRB 120118B: host observations and redshift determination
  7. GRB 130216A: OSN I-band observations
  8. GRB 130215A: P200 NIR observations
  9. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  10. GRB 130215A: RAPTOR Measurements
  11. GRB 130215A: GMG optical observation
  12. GRB 130215A: iTelescope T11 observations
  13. GRB 130215A: Xinglong optical observations
  14. GRB 130215A: TAROT La Silla observatory optical observations
  15. GRB 130215A: RATIR Optical and NIR Observations
  16. GRB 130215A: REM NIR observations
  17. GRB 130215A: CARMA 3mm detection
  18. GRB 130215A: P60 Observations
  19. Skynet Observations of GRB130215
  20. GRB 130215: ROTSE-III Detection of Optical Counterpart
  21. Swift GRB130206A: late XRT observations.
  22. GRB 121128A: optical observations
  23. GRB 121123A: optical observations
  24. GRB 130211A: Swift/UVOT Upper Limits
  25. GRB 130211A: GROND detection of the afterglow
  26. GRB 130206A: GROND Observations
  27. GRB 130206A: Fermi LAT Observations
  28. GRB 130206A: XRT and UVOT follow-up observations.
  29. GRB 130206A: Zadko observatory - Gingin optical observations
  30. GRB 130206A: Swift-XRT observations
  31. GRB 130131A: Swift/UVOT Upper Limits
  32. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  33. GRB 130131B: VLT/X-shooter acquisition camera limits
  34. GRB 130131B: GROND Upper limits
  35. GRB 130131A: CARMA 3mm Observations
  36. GRB 130131A: VLA 5.8 Ghz Detection
  37. GRB 130131B: IAC80 I-band observations
  38. GRB 130131B: Swift/UVOT Upper Limits
  39. GRB 130131B: TAROT Calern observatory optical observations
  40. GRB 130131B: Zadko observatory - Gingin optical observations
  41. GRB 130131A - Faulkes Telescope North Observations
  42. GRB 130131A - UKIRT afterglow candidate
  43. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  44. GRB 130122A: RTT150 optical observations
  45. GRB 130122A: CARMA 3mm Observations
  46. GRB 130122A: Swift/UVOT Detection
  47. GRB 130122A: optical observations
  48. GRB 130122A: RATIR Detection
  49. GRB 130122A: Xinglong optical upper limit
  50. GRB 130122A: T100 observations
  51. GRB 130102B: MASTER synchronous observations
  52. GRB 130102A: Swift/UVOT Upper Limits
  53. GRB 130102A: P60 Observations
  54. GRB 130102A: MASTER-Net optical observations
  55. GRB 130102A: IAC80 I-band observations
  56. GRB 121226A: 5.8 GHz VLA observations
  57. GRB 121229A: Swift/UVOT Upper Limits
  58. GRB 121229A: VLT/X-shooter redshift
  59. GRB 121229A: GROND detection of the afterglow
  60. Skynet/PROMPT observations of GRB121229a
  61. GRB 121226A: 10.4m GTC optical observations
  62. GRB 121226A: Swift/UVOT Upper Limits
  63. GRB 121226A: Optical Observations
  64. GRB 121226A: Zadko observatory - Gingin optical observations
  65. GRB 121226A: BOOTES-4/MET optical observations
  66. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  67. GRB 121217A: ATCA 44GHz upper limit
  68. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  69. GRB 121217A: Swift/UVOT Detection
  70. GRB 121217A: GROND Detection of the Afterglow
  71. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  72. GRB 121209A: Swift/UVOT Upper Limits
  73. GRB 121212A: PdBI mm observations
  74. GRB121212A: NOT optical imaging
  75. GRB 121209A: Early CARMA Observations
  76. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  77. GRB 121212A: Maidanak optical observations
  78. GRB 121211A: RATIR Optical and NIR Observations
  79. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  80. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  81. GRB 121212A: PAIRITEL NIR Observations
  82. GRB 121212A: P60 Observations
  83. GRB 121212A: optical observations in ISON-NM observatory
  84. GRB 121212A: Keck observations
  85. GRB121212A: Swift/UVOT Detection
  86. GRB 121211A: Swift/UVOT Detection
  87. GRB 121209A: Keck observations
  88. GRB 121209A: CARMA 3mm Observations
  89. GRB 121209A: EVLA Observations
  90. GRB 121209A: GROND optical afterglow candidate
  91. GRB 121209A: Gemini-South imaging
  92. GRB 121209A: PAIRITEL NIR Observations
  93. GRB 121128A: Optical Observations
  94. GRB 121202A: Swift/UVOT Upper Limits
  95. GRB 121202A: Swift-XRT observations
  96. GRB 121201A: X-shooter redshift
  97. GRB121202A: Swift/UVOT Observations
  98. GRB 121202A: TAROT Calern observatory optical observations
  99. GRB 121201A: GROND afterglow observations and photometric redshift
  100. GRB 121201A: Swift/UVOT Detection

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