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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"

19596 results found.

  1. GRB 131024A: Skynet R-COP optical observations
  2. Konus-Wind observation of GRB 131011B
  3. GRB 131024A: Enhanced Swift-XRT position
  4. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  5. GRB 131024A: Swift detection of a burst
  6. IPN Triangulation of GRB 131014A
  7. GRB 131018B: Swift/UVOT Upper Limits
  8. GRB 131018B: Swift-XRT observations
  9. GRB 131018A: RATIR Optical and NIR Observations
  10. GRB 131018A: Swift/UVOT Upper Limits
  11. GRB 131018B: Fermi-LAT detection of a burst
  12. GRB 131018A: Swift-XRT refined Analysis
  13. GRB 131018A, Swift-BAT refined analysis
  14. GRB 131018A: P60 Observations
  15. GRB 131018A: Enhanced Swift-XRT position
  16. GRB 131014A: XRT position information
  17. GRB131018A, optical observations
  18. GRB 131018A: Swift detection of a burst
  19. GRB 131014A: Swift-XRT refined Analysis
  20. GRB 131011A: Swift/UVOT Upper Limits
  21. GRB 131014A: Swift/UVOT Upper Limits
  22. GRB 131014A: RATIR Optical and NIR Observations
  23. GRB 131014A: Enhanced XRT position
  24. GRB 131014A: Swift detection of a possible X-ray afterglow
  25. GRB 131014A Tiled Swift observations
  26. GRB 131014A: Fermi-LAT detection
  27. GRB 131011A: Fermi GBM detection
  28. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  29. Trigger 574266 is not a Swift detection of a known source
  30. GRB 130831A: Continued RATIR Optical and NIR Observations
  31. GRB 131004A: Correction to XRT refined analysis
  32. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  33. GRB 131004A, Swift-BAT refined analysis
  34. GRB 131004A: Fermi GBM observation
  35. GRB 131004A: CARMA 93 GHz upper limit
  36. GRB 131004A: Swift/UVOT Detection
  37. GRB 131004A: RATIR Optical and NIR Upper Limits
  38. GRB 131004A: Swift-XRT refined Analysis
  39. GRB 131004A: GROND observations of the afterglow
  40. GRB 131004A: Enhanced Swift-XRT position
  41. GRB 131004A: Swift detection of a burst (may be short)
  42. GRB 131002A, Swift-BAT refined analysis
  43. GRB 130925A: 3mm observations with CARMA
  44. GRB 131002A: Fermi GBM observation
  45. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  46. GRB 131002B, Swift-BAT refined analysis
  47. GRB 131002B: GROND upper limits
  48. GRB 131002B: Swift-XRT Refined Analysis
  49. GRB 131002B: Swift/UVOT Upper Limits
  50. GRB 131002A: Swift/UVOT Detection
  51. GRB 131001A, Swift-BAT refined analysis
  52. GRB 131002A: Swift-XRT refined Analysis
  53. GRB 131002B: Enhanced Swift-XRT position
  54. GRB 131002A: ISON-NM optical observations
  55. Swift J1242.9-3530, Swift-BAT refined analysis
  56. GRB 131001A: Swift UVOT and XRT Upper Limits
  57. GRB 131002A: Enhanced Swift-XRT position
  58. NuSTAR observations of GRB 130925A
  59. GRB 131002B: Swift detection of a burst
  60. GRB 131002A: Swift detection of a burst
  61. GRB 131001A detected in ground analysis of Swift-BAT data
  62. GRB 130925A: continuing Swift/XRT monitoring
  63. Swift Operations in the event of a US Government shutdown
  64. IPN Observations of GRB 130925A
  65. GRB 130930A: Swift detection of a burst
  66. GRB 130929A: Swift/UVOT Upper Limits
  67. GRB 130831A: Continued RATIR Optical and NIR Observations
  68. GRB 130929A: Swift-XRT refined Analysis
  69. GRB 130929A, Swift-BAT refined analysis
  70. GRB 130929A: Enhanced Swift-XRT position
  71. GRB 130929A: TAROT La Silla observatory optical observations
  72. GRB 130929A: Swift detection of a burst
  73. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  74. GRB 130925A: Swift/UVOT Upper Limits
  75. GRB 130925A: sub-mm non-detection with SMA
  76. GRB 130925A: Continued RATIR Optical and NIR Observations
  77. GRB 130925A: Fermi GBM Detection
  78. Konus-Wind observation of GRB 130925A
  79. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  80. GRB 130925A: RATIR Optical and NIR Observations
  81. GRB 130925A Swift-BAT refined analysis
  82. GRB 130925A: Historical non-detection from Rosat-HRI
  83. Fermi GBM detection of GRB 130925A and a possible precursor
  84. GRB 130925A: Swift-XRT refined Analysis
  85. GRB 130925A: Initial Similarities to Swift J1644+57
  86. GRB 130925A: TAROT La Silla observatory optical observations
  87. GRB 130925A: Enhanced Swift-XRT position
  88. GRB 130925A: VLT/X-shooter redshift
  89. GRB 130925A: VLT/UVES observations
  90. GRB 130925A: MAXI/GSC detection
  91. GRB 130925A: GROND afterglow candidate
  92. GRB 130925A: Swift detection of a burst
  93. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  94. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  95. GRB 130907A: Maidanak optical observations
  96. GRB 130912A: AAO optical upper limit
  97. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  98. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  99. GRB 130919A, Swift-BAT refined analysis
  100. GRB 130913A detected in ground analysis of Swift-BAT data

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