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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"

19595 results found.

  1. GRB 131024A: Swift detection of a burst
  2. IPN Triangulation of GRB 131014A
  3. GRB 131018B: Swift/UVOT Upper Limits
  4. GRB 131018B: Swift-XRT observations
  5. GRB 131018A: RATIR Optical and NIR Observations
  6. GRB 131018A: Swift/UVOT Upper Limits
  7. GRB 131018B: Fermi-LAT detection of a burst
  8. GRB 131018A: Swift-XRT refined Analysis
  9. GRB 131018A, Swift-BAT refined analysis
  10. GRB 131018A: P60 Observations
  11. GRB 131018A: Enhanced Swift-XRT position
  12. GRB 131014A: XRT position information
  13. GRB131018A, optical observations
  14. GRB 131018A: Swift detection of a burst
  15. GRB 131014A: Swift-XRT refined Analysis
  16. GRB 131011A: Swift/UVOT Upper Limits
  17. GRB 131014A: Swift/UVOT Upper Limits
  18. GRB 131014A: RATIR Optical and NIR Observations
  19. GRB 131014A: Enhanced XRT position
  20. GRB 131014A: Swift detection of a possible X-ray afterglow
  21. GRB 131014A Tiled Swift observations
  22. GRB 131014A: Fermi-LAT detection
  23. GRB 131011A: Fermi GBM detection
  24. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  25. Trigger 574266 is not a Swift detection of a known source
  26. GRB 130831A: Continued RATIR Optical and NIR Observations
  27. GRB 131004A: Correction to XRT refined analysis
  28. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  29. GRB 131004A, Swift-BAT refined analysis
  30. GRB 131004A: Fermi GBM observation
  31. GRB 131004A: CARMA 93 GHz upper limit
  32. GRB 131004A: Swift/UVOT Detection
  33. GRB 131004A: RATIR Optical and NIR Upper Limits
  34. GRB 131004A: Swift-XRT refined Analysis
  35. GRB 131004A: GROND observations of the afterglow
  36. GRB 131004A: Enhanced Swift-XRT position
  37. GRB 131004A: Swift detection of a burst (may be short)
  38. GRB 131002A, Swift-BAT refined analysis
  39. GRB 130925A: 3mm observations with CARMA
  40. GRB 131002A: Fermi GBM observation
  41. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  42. GRB 131002B, Swift-BAT refined analysis
  43. GRB 131002B: GROND upper limits
  44. GRB 131002B: Swift-XRT Refined Analysis
  45. GRB 131002B: Swift/UVOT Upper Limits
  46. GRB 131002A: Swift/UVOT Detection
  47. GRB 131001A, Swift-BAT refined analysis
  48. GRB 131002A: Swift-XRT refined Analysis
  49. GRB 131002B: Enhanced Swift-XRT position
  50. GRB 131002A: ISON-NM optical observations
  51. Swift J1242.9-3530, Swift-BAT refined analysis
  52. GRB 131001A: Swift UVOT and XRT Upper Limits
  53. GRB 131002A: Enhanced Swift-XRT position
  54. NuSTAR observations of GRB 130925A
  55. GRB 131002B: Swift detection of a burst
  56. GRB 131002A: Swift detection of a burst
  57. GRB 131001A detected in ground analysis of Swift-BAT data
  58. GRB 130925A: continuing Swift/XRT monitoring
  59. Swift Operations in the event of a US Government shutdown
  60. IPN Observations of GRB 130925A
  61. GRB 130930A: Swift detection of a burst
  62. GRB 130929A: Swift/UVOT Upper Limits
  63. GRB 130831A: Continued RATIR Optical and NIR Observations
  64. GRB 130929A: Swift-XRT refined Analysis
  65. GRB 130929A, Swift-BAT refined analysis
  66. GRB 130929A: Enhanced Swift-XRT position
  67. GRB 130929A: TAROT La Silla observatory optical observations
  68. GRB 130929A: Swift detection of a burst
  69. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  70. GRB 130925A: Swift/UVOT Upper Limits
  71. GRB 130925A: sub-mm non-detection with SMA
  72. GRB 130925A: Continued RATIR Optical and NIR Observations
  73. GRB 130925A: Fermi GBM Detection
  74. Konus-Wind observation of GRB 130925A
  75. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  76. GRB 130925A: RATIR Optical and NIR Observations
  77. GRB 130925A Swift-BAT refined analysis
  78. GRB 130925A: Historical non-detection from Rosat-HRI
  79. Fermi GBM detection of GRB 130925A and a possible precursor
  80. GRB 130925A: Swift-XRT refined Analysis
  81. GRB 130925A: Initial Similarities to Swift J1644+57
  82. GRB 130925A: TAROT La Silla observatory optical observations
  83. GRB 130925A: Enhanced Swift-XRT position
  84. GRB 130925A: VLT/X-shooter redshift
  85. GRB 130925A: VLT/UVES observations
  86. GRB 130925A: MAXI/GSC detection
  87. GRB 130925A: GROND afterglow candidate
  88. GRB 130925A: Swift detection of a burst
  89. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  90. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  91. GRB 130907A: Maidanak optical observations
  92. GRB 130912A: AAO optical upper limit
  93. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  94. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  95. GRB 130919A, Swift-BAT refined analysis
  96. GRB 130913A detected in ground analysis of Swift-BAT data
  97. GRB 130919A: Swift detection of a burst
  98. GRB 130903A: Further Swift XRT observations.
  99. GRB 130606A: Chandra observation
  100. GRB 130912A: Swift/UVOT Upper Limits

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