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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"

37770 results found.

  1. GRB 190220A: Swift-BAT refined analysis
  2. GRB 190219A: Swift-BAT refined analysis
  3. GRB 190220A: Enhanced Swift-XRT position
  4. GRB 190219A: NOT optical afterglow candidate
  5. GRB 190219A: NEXT-0.6m optical upper limit
  6. GRB 190219A: Swift-XRT refined Analysis
  7. GRB 190220A: Swift detection of a burst with an optical counterpart
  8. GRB 190219A: Enhanced Swift-XRT position
  9. GRB 190219A: CAHA 2.2m observations
  10. GRB 190219A: BOOTES-1 optical limits
  11. GRB 190219A: Prompt enhanced Swift-XRT position
  12. GRB 190219A: Swift detection of a burst
  13. GRB 190215A: AstroSat CZTI detection
  14. GRB 190215A: Insight-HXMT/HE detection
  15. GRB 190215A: Fermi GBM detection
  16. GRB 190212A: Insight-HXMT/HE detection
  17. GRB190211A: GROWTH-India detection of optical afterglow
  18. GRB 190211A: Tautenburg observations
  19. GRB 190211A: Swift/UVOT Detection
  20. GRB 190211A: DOAO optical observation
  21. GRB 190206A: AstroSat CZTI detection
  22. GRB190211A: MITSuME Akeno optical observation
  23. GRB 190211A: NOT optical observations
  24. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  25. GRB 190211A: Swift-XRT refined Analysis
  26. GRB 190211A: Swift-BAT refined analysis
  27. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  28. GRB 190211A: NEXT-0.6m optical afterglow detection
  29. GRB 190211A: Swift detection of a burst
  30. GRB 190202A: Terskol 2-m optical observations
  31. Konus-Wind observation of GRB 190206A
  32. IPN Triangulation of GRB 190206A (short/extremely bright)
  33. GRB 190203A: Mondy optical observations
  34. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 190202A: AstroSat CZTI detection
  36. GRB190202A: GROWTH-India detection of optical afterglow
  37. GRB 190203A: Swift-BAT refined analysis
  38. GRB 190204A: Swift-BAT refined analysis
  39. GRB 190202A: Xinglong-2.16m optical observations
  40. GRB 190202A: SAO RAS further optical observations
  41. Konus-Wind observation of GRB 190204A
  42. GRB 190204A: SAO RAS optical observations
  43. GRB 190204A: Mondy optical upper limit
  44. GRB 190203A: AstroSat CZTI detection
  45. GRB190203A: UVOT analysis
  46. GRB 190203A: COATLI Optical Observations
  47. GRB 190204A: Swift/UVOT Detection
  48. GRB 190204A: Enhanced Swift-XRT position
  49. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  50. GRB 190203A: Liverpool Telescope near-IR observations
  51. Konus-Wind observation of GRB 190203A
  52. GRB 190203A: Swift-XRT refined Analysis
  53. GRB 190204A: Swift-XRT refined Analysis
  54. GRB 190204A: AstroSat CZTI detection
  55. Swift Trigger 887541: MASTER inspect
  56. GRB 190204A: MAXI/GSC detection
  57. GRB 190202A: R and I band observation from HCT
  58. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  59. GRB 190203A: MASTER OT detection
  60. GRB 190203A: Enhanced Swift-XRT position
  61. GRB 190203A: SAO RAS optical observations, afterglow fading
  62. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  63. GRB 190203A: Swift detection of a burst with an optical counterpart
  64. GRB 190202A: SAO RAS optical observations
  65. GRB 190202A: TSHAO optical observations
  66. GRB 190202A: NOT optical observations
  67. GRB 190202A: McDonald 0.8-m telescope optical observation
  68. GRB 190202A: Swift-XRT refined Analysis
  69. GRB 190202A: LCO-CTIO optical observations
  70. GRB 190202A: Fermi GBM observation
  71. Fermi GBM trigger 570825115/190202772 is not a GRB
  72. GRB 190202A, Swift-BAT refined analysis
  73. GRB 190202A: AGILE ratemeters detection
  74. GRB 190202A: Swift/UVOT Detection
  75. GRB 190202A: GOTO optical observations
  76. GRB 190202A: Enhanced Swift-XRT position
  77. GRB 190202A: Koshka Zeiss-1000 optical observations
  78. GRB 190202A: Swift detection of a burst with an optical counterpart
  79. Fermi GBM trigger 570716645/190201517 is not a GRB
  80. GRB 190131A: Insight-HXMT/HE detection
  81. GRB 190131A: AstroSat CZTI detection
  82. GRB 190126A: AstroSat CZTI detection
  83. Fermi GBM trigger 570659556/190131856 is not a GRB
  84. GRB 190129B: Insight-HXMT/HE detection
  85. GRB 190114C: JCMT SCUBA-2 sub-mm observations
  86. Improved IPN error box for GRB 190129B
  87. GRB 190129B: GOTO optical observations
  88. GRB 190129B: DDOTI Detection of the Possible Afterglow and Suggestion of Fading
  89. GRB 190129B: Swift/UVOT Upper Limits
  90. GRB 190129B: ePESSTO NTT optical observations
  91. GRB 190129B: AstroSat CZTI detection
  92. GRB 190129B: MASTER Global Robotic Net optical observation
  93. GRB 190129A: CALET Gamma-Ray Burst Monitor detection
  94. GRB 190129B: GROND possible host candidate
  95. GRB 190129B: Swift-XRT candidate afterglow detection
  96. GRB 190129B: Tiled Swift observations
  97. Fermi GBM Observations of IceCube-190124A
  98. GRB 190129A: Fermi GBM detection
  99. Konus-Wind observation of extremely bright GRB 190129B
  100. IPN Triangulation of GRB 190129B (long/extremely bright)

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