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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"
  1. GRB 140606A: Nanshan optical upper limit
  2. GRB 140606A: Swift/UVOT Upper Limits
  3. GRB 140606A: Swift-XRT upper limits
  4. Swift XRT status update
  5. Swift Trigger 600914 is noise
  6. GRB 140606A: Swift-BAT refined analysis
  7. GRB 140606A: Swift detection of a short hard burst
  8. Swift Trigger 600914 is probably a noise fluctuation
  9. Konus-Wind observation of GRB 140604A
  10. IPN Triangulation of GRB 140604A (short/hard)
  11. Swift XRT is off-line
  12. GRB 140523A: further Swift-XRT observations
  13. GRB 140528A: Fermi GBM Detection
  14. GRB 140529A BAT refined analysis
  15. Konus-Wind observation of GRB 140529A
  16. Konus-Wind observation of GRB 140528A
  17. GRB 140529A: Swift/UVOT Upper Limits
  18. GRB 140529A: Swift-XRT afterglow detection.
  19. GRB 140408A: Withdrawal of afterglow candidate
  20. GRB 140529A found in ground analysis of BAT slew data
  21. IPN Triangulation of GRB 140528A
  22. Chandra late-time observations of GRB140515A
  23. Swift Trigger 600114 in M31: UVOT Observations
  24. Swift trigger 600114 is not an outbursting X-ray source
  25. Swift Trigger 600114: Optical spectroscopy from GTC
  26. Swift Trigger 600114: Preliminary BAT analysis
  27. Swift Trigger 600114 in M31: Archival and Prompt UVOT Imaging
  28. Swift detection of a bright X-ray source in M31
  29. Fermi GBM trigger 422752719/ 140525971 is not a GRB
  30. Swift detection of SFXT IGR J17544-2619
  31. GRB 140523A: NOT observation
  32. Konus-Wind observation of GRB 140523A
  33. IPN Triangulation of GRB 140523A
  34. GRB 140523A: Nanshan optical upper limit
  35. Swift trigger 599860 probably not real
  36. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  37. GRB 140523A Tiled Swift observations
  38. GRB 140523A: Fermi-LAT detection
  39. GRB 140523A: Fermi GBM detection
  40. GRB 140521A : Xinglong TNT upper limit
  41. GRB 140521A: Fermi GBM Detection
  42. GRB 140423A: TShAO optical observations
  43. GRB 140521A: AAO optical observations
  44. GRB 140521A: Swift-BAT refined analysis
  45. GRB 140521A: AROMA-N Optical Observation
  46. GRB 140521A: MITSuME Okayama upper limits
  47. GRB 140516A: further Swift-XRT analysis
  48. GRB 140521A: MASTER optical observations
  49. GRB 140521A: Swift detection of a burst
  50. GRB 140512A: Redshift from NOT
  51. GRB 140518A: T100 observations
  52. GRB 140518A: Continued RATIR Optical and NIR Observations
  53. GRB 140512A: MASTER prompt and afterglow optical observations
  54. GRB 140518A, Swift-BAT refined analysis
  55. GRB 140518A: Swift-XRT refined Analysis
  56. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  57. GRB 140518A: Swift/UVOT Upper Limits
  58. GRB 140518A: RATIR Optical and NIR Observations
  59. GRB 140518A: Gemini-N redshift
  60. GRB 140518A: P60 i-/z-band detections
  61. GRB 140518A: KAIT optical candidate
  62. GRB 140518A: Swift detection of a burst
  63. GRB 140516A: RATIR Optical and NIR Observations
  64. GRB 140516A: Subaru NIR imaging observations
  65. GRB 140516A: 6 GHz upper limit
  66. GRB 140516A: Gemini-North limit on an optical afterglow
  67. GRB 140516A: Swift/UVOT Upper Limits
  68. GRB 140516A: Swift-BAT refined analysis
  69. GRB 140516A: Swift-XRT refined Analysis
  70. GRB 140516A: NOT optical observations
  71. GRB 140516A: Enhanced Swift-XRT position
  72. GRB 140516A: MASTER early optical observations
  73. GRB 140516A: ISON-Kislovodsk optical observations
  74. GRB 140516A: TNG optical observations
  75. GRB 140516A: Swift detection of a short burst
  76. GRB 140515A: Swift-BAT refined analysis
  77. GRB 140515A: VLA Detection
  78. GRB 140515A : TNG near-infrared observations
  79. GRB 140419A: Continued Mondy optical observations
  80. GRB 140515A: GROND observation of the afterglow
  81. GRB 140515A: Spectroscopy from the 10.4m GTC
  82. GRB 140515A: Optical observations from the 2.5 m NOT
  83. GRB 140515A: Swift-XRT refined Analysis
  84. GRB 140515B: MAXI/GSC detection
  85. GRB 140515A: KAIT Optical Upper Limit
  86. GRB 140515A: Gemini-North imaging
  87. GRB 140515A: Swift/UVOT Upper Limits
  88. GRB 140423A: HCT optical observations
  89. GRB 140515A: MITSuME Akeno upper limits
  90. GRB 140515A: Enhanced Swift-XRT position
  91. GRB 140515A: Gemini-N redshift
  92. Trigger 599041: Swift detection of SFXT IGR J16479-4514
  93. GRB 140515A: Swift detection of a burst
  94. GRB 140508A: VLA detection
  95. Konus-Wind observation of GRB 140512A
  96. GRB 140423A: AAO optical upper limits
  97. GRB 140512A: Continued UVOT Observations
  98. GRB 140512A: Fermi GBM detection
  99. GRB 140512A: Xinglong TNT optical observation
  100. GRB 140508A: Mondy upper limit

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