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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"

19604 results found.

  1. GRB 131024B: RATIR Optical and NIR Observations
  2. GRB 131024B: Swift/UVOT Upper Limits
  3. GRB 131024B: Swift-XRT refined Analysis
  4. GRB 131024A: Swift/UVOT Upper Limits
  5. GRB 131024B: Enhanced Swift-XRT position
  6. GRB 131024A: Swift-XRT refined Analysis
  7. GRB 131024B: Swift detection of a burst
  8. GRB 131024A, Swift-BAT refined analysis
  9. GRB 131024A: Skynet R-COP optical observations
  10. Konus-Wind observation of GRB 131011B
  11. GRB 131024A: Enhanced Swift-XRT position
  12. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  13. GRB 131024A: Swift detection of a burst
  14. IPN Triangulation of GRB 131014A
  15. GRB 131018B: Swift/UVOT Upper Limits
  16. GRB 131018B: Swift-XRT observations
  17. GRB 131018A: RATIR Optical and NIR Observations
  18. GRB 131018A: Swift/UVOT Upper Limits
  19. GRB 131018B: Fermi-LAT detection of a burst
  20. GRB 131018A: Swift-XRT refined Analysis
  21. GRB 131018A, Swift-BAT refined analysis
  22. GRB 131018A: P60 Observations
  23. GRB 131018A: Enhanced Swift-XRT position
  24. GRB 131014A: XRT position information
  25. GRB131018A, optical observations
  26. GRB 131018A: Swift detection of a burst
  27. GRB 131014A: Swift-XRT refined Analysis
  28. GRB 131011A: Swift/UVOT Upper Limits
  29. GRB 131014A: Swift/UVOT Upper Limits
  30. GRB 131014A: RATIR Optical and NIR Observations
  31. GRB 131014A: Enhanced XRT position
  32. GRB 131014A: Swift detection of a possible X-ray afterglow
  33. GRB 131014A Tiled Swift observations
  34. GRB 131014A: Fermi-LAT detection
  35. GRB 131011A: Fermi GBM detection
  36. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  37. Trigger 574266 is not a Swift detection of a known source
  38. GRB 130831A: Continued RATIR Optical and NIR Observations
  39. GRB 131004A: Correction to XRT refined analysis
  40. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  41. GRB 131004A, Swift-BAT refined analysis
  42. GRB 131004A: Fermi GBM observation
  43. GRB 131004A: CARMA 93 GHz upper limit
  44. GRB 131004A: Swift/UVOT Detection
  45. GRB 131004A: RATIR Optical and NIR Upper Limits
  46. GRB 131004A: Swift-XRT refined Analysis
  47. GRB 131004A: GROND observations of the afterglow
  48. GRB 131004A: Enhanced Swift-XRT position
  49. GRB 131004A: Swift detection of a burst (may be short)
  50. GRB 131002A, Swift-BAT refined analysis
  51. GRB 130925A: 3mm observations with CARMA
  52. GRB 131002A: Fermi GBM observation
  53. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  54. GRB 131002B, Swift-BAT refined analysis
  55. GRB 131002B: GROND upper limits
  56. GRB 131002B: Swift-XRT Refined Analysis
  57. GRB 131002B: Swift/UVOT Upper Limits
  58. GRB 131002A: Swift/UVOT Detection
  59. GRB 131001A, Swift-BAT refined analysis
  60. GRB 131002A: Swift-XRT refined Analysis
  61. GRB 131002B: Enhanced Swift-XRT position
  62. GRB 131002A: ISON-NM optical observations
  63. Swift J1242.9-3530, Swift-BAT refined analysis
  64. GRB 131001A: Swift UVOT and XRT Upper Limits
  65. GRB 131002A: Enhanced Swift-XRT position
  66. NuSTAR observations of GRB 130925A
  67. GRB 131002B: Swift detection of a burst
  68. GRB 131002A: Swift detection of a burst
  69. GRB 131001A detected in ground analysis of Swift-BAT data
  70. GRB 130925A: continuing Swift/XRT monitoring
  71. Swift Operations in the event of a US Government shutdown
  72. IPN Observations of GRB 130925A
  73. GRB 130930A: Swift detection of a burst
  74. GRB 130929A: Swift/UVOT Upper Limits
  75. GRB 130831A: Continued RATIR Optical and NIR Observations
  76. GRB 130929A: Swift-XRT refined Analysis
  77. GRB 130929A, Swift-BAT refined analysis
  78. GRB 130929A: Enhanced Swift-XRT position
  79. GRB 130929A: TAROT La Silla observatory optical observations
  80. GRB 130929A: Swift detection of a burst
  81. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  82. GRB 130925A: Swift/UVOT Upper Limits
  83. GRB 130925A: sub-mm non-detection with SMA
  84. GRB 130925A: Continued RATIR Optical and NIR Observations
  85. GRB 130925A: Fermi GBM Detection
  86. Konus-Wind observation of GRB 130925A
  87. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  88. GRB 130925A: RATIR Optical and NIR Observations
  89. GRB 130925A Swift-BAT refined analysis
  90. GRB 130925A: Historical non-detection from Rosat-HRI
  91. Fermi GBM detection of GRB 130925A and a possible precursor
  92. GRB 130925A: Swift-XRT refined Analysis
  93. GRB 130925A: Initial Similarities to Swift J1644+57
  94. GRB 130925A: TAROT La Silla observatory optical observations
  95. GRB 130925A: Enhanced Swift-XRT position
  96. GRB 130925A: VLT/X-shooter redshift
  97. GRB 130925A: VLT/UVES observations
  98. GRB 130925A: MAXI/GSC detection
  99. GRB 130925A: GROND afterglow candidate
  100. GRB 130925A: Swift detection of a burst

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