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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"

37737 results found.

  1. GRB 180120A: Fermi GBM Detection
  2. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  3. Fermi GBM trigger 538316685/180122517 is not a GRB
  4. GRB 180113B: AstroSat CZTI detection
  5. GRB 180113A: AstroSat CZTI detection
  6. GRB 180115A: SEDM Observations
  7. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  8. Konus-Wind observation of GRB 171209A
  9. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  10. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  11. GRB 180115A: Swift/UVOT Detection
  12. GRB 180116A: Fermi GBM Detection
  13. Konus-Wind observation of GRB 180113B
  14. IPN Triangulation of GRB 180113B
  15. GRB 180112A: Insight-HXMT/HE detection/observation
  16. GRB 180111A AROMA-N optical observation
  17. Konus-Wind observation of GRB 180113C
  18. e-MERLIN detection of GRB 171205A
  19. IPN Triangulation of GRB 180113C
  20. GRB 180115A: Swift-BAT refined analysis
  21. GRB 180116A: MAXI/GSC detection
  22. GRB 180115A: Redshift from OSIRIS/GTC
  23. GRB 180115A: NOT detection of optical counterpart
  24. Konus-Wind observation of GRB 180113A
  25. GRB 180113C: Insight-HXMT/HE observation
  26. GRB 180113B: Insight-HXMT/HE observation
  27. GRB 180111A: Insight-HXMT/HE observation
  28. GRB 180115A: MITSuME Akeno optical upper limits
  29. GRB 180113A: Swift ToO observations
  30. GRB 180115A: Swift-XRT refined Analysis
  31. GRB 180115A: Enhanced Swift-XRT position
  32. Konus-Wind observation of GRB 180111A
  33. GRB 180115A: Swift detection of a burst with an optical counterpart.
  34. GRB 180113C: Fermi GBM detection
  35. GRB 180111A CALET Gamma-Ray Burst Monitor detection
  36. GRB 180113A: Swift-BAT refined analysis
  37. GRB 180111A: AbAO optical observations
  38. GRB 180113A: KAIT Optical Observations
  39. GRB 180113B: Fermi GBM detection
  40. GRB 180113A: Fermi GBM observation
  41. GRB 180111A: Swift/UVOT Detection
  42. GRB 180103A: Swift-XRT afterglow detection
  43. GRB 180113A: Swift detection of a burst
  44. GRB 180111A: Swift-BAT refined analysis
  45. GRB 180111A: RATIR Optical and NIR Observations
  46. GRB 180111A: Swift-XRT refined Analysis
  47. GRB 180111A: AGILE/MCAL detection
  48. GRB180111A: Xinglong TNT possible optical detection
  49. GRB 180111A: Enhanced Swift-XRT position
  50. GRB 180111A: Swift detection of a burst with an optical counterpart
  51. Correction to GCN Circular 22316: GRB 171230B: Insight-HXMT detection
  52. GRB 171230B: Insight-HXMT/HE detection
  53. GRB 180103A: LCO Sutherland 1-m telescope observations
  54. Konus-Wind observation of GRB 180103A
  55. GRB 171227A: AstroSat CZTI detection
  56. GRB 171223A; AstroSat CZTI detection
  57. Fermi GBM Trigger 537135776/180108849 is not a GRB
  58. GRB 180103A: AstroSat CZTI detection
  59. GRB 180103A: Swift/UVOT Upper Limits
  60. GRB 180103A: Swift-XRT observations
  61. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  62. GRB 180103A: Swift ToO observations
  63. GRB 180103A: Swift detection of a burst
  64. GRB 171229A CALET Gamma-Ray Burst Monitor detection
  65. GRB 180102A AROMA-N optical observation
  66. VLBA detection of GRB 171205A
  67. GRB 180102A: TSHAO optical upper limit
  68. GRB 180102A: Swift-BAT refined analysis
  69. GRB 180102A: Swift/UVOT Upper Limits
  70. GRB 180102A: NOT optical observations
  71. GRB 180102A: MASTER-Net robotic report
  72. GRB 180102A: Swift-XRT refined Analysis
  73. GRB 180102A: Fermi GBM detection
  74. GRB 180102A: Enhanced Swift-XRT position
  75. GRB 180102A: Prompt enhanced Swift-XRT position
  76. GRB 180102A: Swift detection of a burst
  77. Konus-Wind observation of GRB 171227A
  78. IPN Triangulation of GRB 171227A
  79. GRB 171227A: Fermi GBM detection
  80. GRB 171227A: AGILE/MCAL detection
  81. GRB 171215A: Insight-HXMT/HE detection
  82. GRB 171223A: Insight-HXMT/HE detection
  83. GRB 171212C CALET Gamma-Ray Burst Monitor detection
  84. Konus-Wind observation of GRB 171216B
  85. IceCube-171106A: Konus-Wind upper limits
  86. IceCube-171015A: Konus-Wind upper limits
  87. IceCube-170922A: Konus-Wind upper limits
  88. GRB 171222A: Swift-BAT refined analysis
  89. GRB 171222A: AROMA-N optical observation
  90. GRB 171223A: Fermi GBM detection
  91. GRB 171222A: Fermi GBM detection
  92. GRB 171222A: Nanshan-0.36m optical upper limit
  93. GRB 171222A: Swift/UVOT Upper Limits
  94. GRB 171222A: Nanshan-1m optical afterglow detection
  95. GRB 171222A: MASTER-Net OT observations
  96. GRB 171222A: Redshift from 10.4m GTC/OSIRIS
  97. GRB 171222A: Swift-XRT refined Analysis
  98. GRB 171205A: SMARTS optical/IR supernova monitoring
  99. GRB 171222A: NOT Optical Afterglow
  100. GRB 171216B CALET Gamma-Ray Burst Monitor detection

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