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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"

39462 results found.

  1. GRB 131029A: Fermi GBM observation
  2. GRB 131029A Tiled Swift observations
  3. GRB 131029A: Fermi-LAT detection of a burst
  4. Konus-Wind observation of GRB 131028A
  5. IPN Triangulation of GRB 131028A (long/bright)
  6. GRB 131028A: Fermi GBM detection
  7. GRB 131011A: ATCA 34GHz upper limit
  8. Swift 575905/GRB 131026A: optical observations
  9. GRB 131024B: AAO optical upper limit
  10. GRB 131024B: Mondy optical upper limits
  11. GRB 131024B: MASTER prompt optical observation
  12. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  13. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  14. Swift Trigger 575905: ROTSE-III Optical Limits
  15. Swift Trigger 575905: KAIT Optical Upper Limit
  16. GRB 131026A: TAROT La Silla observatory optical observations
  17. Swift Trigger 575905: a possible GRB
  18. GRB 131024B, Swift-BAT refined analysis
  19. GRB 131024B: Fermi GBM observation
  20. GRB 131024B: RATIR Optical and NIR Observations
  21. GRB 131024B: Swift/UVOT Upper Limits
  22. GRB 131024B : Xinglong TNT upper limit
  23. GRB 131024B: Swift-XRT refined Analysis
  24. Fermi GBM trigger 13121024.436 is not a GRB
  25. GRB 131024B: Nanshan optical upper limit
  26. GRB 131024A: Swift/UVOT Upper Limits
  27. GRB 131024B: Enhanced Swift-XRT position
  28. GRB 131024A: GROND upper limits
  29. GRB 131024A: Swift-XRT refined Analysis
  30. GRB 131024B: Swift detection of a burst
  31. GRB 131024A, Swift-BAT refined analysis
  32. GRB 131024A: Skynet R-COP optical observations
  33. Konus-Wind observation of GRB 131011B
  34. GRB 131024A: Enhanced Swift-XRT position
  35. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  36. GRB 131024A: Swift detection of a burst
  37. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  38. IPN Triangulation of GRB 131014A
  39. GRB 131018B: Swift/UVOT Upper Limits
  40. GRB 131018B: Swift-XRT observations
  41. GRB 131018B: Fermi GBM observation
  42. GRB 131018A: RATIR Optical and NIR Observations
  43. GRB 131018A: Swift/UVOT Upper Limits
  44. GRB 131018B: Fermi-LAT detection of a burst
  45. GRB 131018A: Swift-XRT refined Analysis
  46. GRB 131018A: KAIT Optical Upper Limit
  47. GRB 131018A, Swift-BAT refined analysis
  48. GRB 131018A: P60 Observations
  49. GRB 131018A: Enhanced Swift-XRT position
  50. GRB 131014A: XRT position information
  51. GRB131018A, optical observations
  52. GRB 131018A: Swift detection of a burst
  53. GRB 131014A: Suzaku WAM observation of the prompt emission
  54. GRB 131014A: GROND observations
  55. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  56. Fermi GBM data availability during U.S. government shutdown
  57. GRB 131014A: Swift-XRT refined Analysis
  58. GRB 131011A: Swift/UVOT Upper Limits
  59. GRB 131014A: Swift/UVOT Upper Limits
  60. Fermi 403206457 / GRB 131011A: AAO optical observations
  61. GRB 131014A: RATIR Optical and NIR Observations
  62. GRB 131014A: Enhanced XRT position
  63. Konus-Wind observation of GRB 131014A
  64. GRB 131014A: NOT afterglow candidate
  65. GRB 131014A: Nanshan optical observations
  66. GRB 131014A: Swift detection of a possible X-ray afterglow
  67. GRB 131014A Tiled Swift observations
  68. GRB 131014A: Fermi-LAT detection
  69. GRB 131014A: Fermi GBM detection
  70. GRB 131011A: Fermi GBM detection
  71. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  72. GRB 131011A: GROND afterglow observations
  73. Fermi403206457: continued P60 observations and fading behavior
  74. Fermi403206457: Weihai optical upper limit
  75. Fermi403206457: NOT optical observations
  76. Trigger 574266 is not a Swift detection of a known source
  77. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  78. GRB 130831A: Continued RATIR Optical and NIR Observations
  79. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  80. GRB 131004A: MOSFIRE NIR imaging
  81. GRB 131004A: Correction to XRT refined analysis
  82. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  83. GRB 131004A, Swift-BAT refined analysis
  84. GRB 131004A: Fermi GBM observation
  85. GRB 131004A: CARMA 93 GHz upper limit
  86. GRB 131004A: Swift/UVOT Detection
  87. GRB 131004A: RATIR Optical and NIR Upper Limits
  88. GRB 131004A: Swift-XRT refined Analysis
  89. GRB131004A: TNG Redshift confirmation
  90. GRB 131004A: GROND observations of the afterglow
  91. GRB 131004A: Enhanced Swift-XRT position
  92. GRB131004A: Magellan Redshift
  93. GRB 131004A: Liverpool Telescope optical afterglow observations
  94. GRB 131004A: TNG optical afterglow confirmation
  95. GRB 131004A: optical afterglow from the NOT
  96. GRB 131004A: Swift detection of a burst (may be short)
  97. GRB 131002A, Swift-BAT refined analysis
  98. GRB 130925A: 3mm observations with CARMA
  99. GRB 131002A: Fermi GBM observation
  100. GRB 130925A/Sw J0244-2609: mm observations at PdBI

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