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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"

37767 results found.

  1. GRB 190219A: NOT optical afterglow candidate
  2. GRB 190219A: NEXT-0.6m optical upper limit
  3. GRB 190219A: Swift-XRT refined Analysis
  4. GRB 190220A: Swift detection of a burst with an optical counterpart
  5. GRB 190219A: Enhanced Swift-XRT position
  6. GRB 190219A: CAHA 2.2m observations
  7. GRB 190219A: BOOTES-1 optical limits
  8. GRB 190219A: Prompt enhanced Swift-XRT position
  9. GRB 190219A: Swift detection of a burst
  10. GRB 190215A: AstroSat CZTI detection
  11. GRB 190215A: Insight-HXMT/HE detection
  12. GRB 190215A: Fermi GBM detection
  13. GRB 190212A: Insight-HXMT/HE detection
  14. GRB190211A: GROWTH-India detection of optical afterglow
  15. GRB 190211A: Tautenburg observations
  16. GRB 190211A: Swift/UVOT Detection
  17. GRB 190211A: DOAO optical observation
  18. GRB 190206A: AstroSat CZTI detection
  19. GRB190211A: MITSuME Akeno optical observation
  20. GRB 190211A: NOT optical observations
  21. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  22. GRB 190211A: Swift-XRT refined Analysis
  23. GRB 190211A: Swift-BAT refined analysis
  24. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  25. GRB 190211A: NEXT-0.6m optical afterglow detection
  26. GRB 190211A: Swift detection of a burst
  27. GRB 190202A: Terskol 2-m optical observations
  28. Konus-Wind observation of GRB 190206A
  29. IPN Triangulation of GRB 190206A (short/extremely bright)
  30. GRB 190203A: Mondy optical observations
  31. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  32. GRB 190202A: AstroSat CZTI detection
  33. GRB190202A: GROWTH-India detection of optical afterglow
  34. GRB 190203A: Swift-BAT refined analysis
  35. GRB 190204A: Swift-BAT refined analysis
  36. GRB 190202A: Xinglong-2.16m optical observations
  37. GRB 190202A: SAO RAS further optical observations
  38. Konus-Wind observation of GRB 190204A
  39. GRB 190204A: SAO RAS optical observations
  40. GRB 190204A: Mondy optical upper limit
  41. GRB 190203A: AstroSat CZTI detection
  42. GRB190203A: UVOT analysis
  43. GRB 190203A: COATLI Optical Observations
  44. GRB 190204A: Swift/UVOT Detection
  45. GRB 190204A: Enhanced Swift-XRT position
  46. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  47. GRB 190203A: Liverpool Telescope near-IR observations
  48. Konus-Wind observation of GRB 190203A
  49. GRB 190203A: Swift-XRT refined Analysis
  50. GRB 190204A: Swift-XRT refined Analysis
  51. GRB 190204A: AstroSat CZTI detection
  52. Swift Trigger 887541: MASTER inspect
  53. GRB 190204A: MAXI/GSC detection
  54. GRB 190202A: R and I band observation from HCT
  55. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  56. GRB 190203A: MASTER OT detection
  57. GRB 190203A: Enhanced Swift-XRT position
  58. GRB 190203A: SAO RAS optical observations, afterglow fading
  59. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  60. GRB 190203A: Swift detection of a burst with an optical counterpart
  61. GRB 190202A: SAO RAS optical observations
  62. GRB 190202A: TSHAO optical observations
  63. GRB 190202A: NOT optical observations
  64. GRB 190202A: McDonald 0.8-m telescope optical observation
  65. GRB 190202A: Swift-XRT refined Analysis
  66. GRB 190202A: LCO-CTIO optical observations
  67. GRB 190202A: Fermi GBM observation
  68. Fermi GBM trigger 570825115/190202772 is not a GRB
  69. GRB 190202A, Swift-BAT refined analysis
  70. GRB 190202A: AGILE ratemeters detection
  71. GRB 190202A: Swift/UVOT Detection
  72. GRB 190202A: GOTO optical observations
  73. GRB 190202A: Enhanced Swift-XRT position
  74. GRB 190202A: Koshka Zeiss-1000 optical observations
  75. GRB 190202A: Swift detection of a burst with an optical counterpart
  76. Fermi GBM trigger 570716645/190201517 is not a GRB
  77. GRB 190131A: Insight-HXMT/HE detection
  78. GRB 190131A: AstroSat CZTI detection
  79. GRB 190126A: AstroSat CZTI detection
  80. Fermi GBM trigger 570659556/190131856 is not a GRB
  81. GRB 190129B: Insight-HXMT/HE detection
  82. GRB 190114C: JCMT SCUBA-2 sub-mm observations
  83. Improved IPN error box for GRB 190129B
  84. GRB 190129B: GOTO optical observations
  85. GRB 190129B: DDOTI Detection of the Possible Afterglow and Suggestion of Fading
  86. GRB 190129B: Swift/UVOT Upper Limits
  87. GRB 190129B: ePESSTO NTT optical observations
  88. GRB 190129B: AstroSat CZTI detection
  89. GRB 190129B: MASTER Global Robotic Net optical observation
  90. GRB 190129A: CALET Gamma-Ray Burst Monitor detection
  91. GRB 190129B: GROND possible host candidate
  92. GRB 190129B: Swift-XRT candidate afterglow detection
  93. GRB 190129B: Tiled Swift observations
  94. Fermi GBM Observations of IceCube-190124A
  95. GRB 190129A: Fermi GBM detection
  96. Konus-Wind observation of extremely bright GRB 190129B
  97. IPN Triangulation of GRB 190129B (long/extremely bright)
  98. INTEGRAL observation of IceCube-190124A
  99. GRB 190129A: MAXI/GSC detection
  100. Swift Trigger 886157: MASTER optical observation

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