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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"

42000 results found.

  1. GRB 161020A: Fermi GBM observation
  2. Fermi GBM trigger 499467682/161029876 is not a GRB
  3. GRB 161015A: 15 GHz upper limits from AMI
  4. GRB 161014A: 15 GHz upper limits from AMI
  5. GRB161023A: AstroSat CZTI detection
  6. GRB 161023A: GROND Observations
  7. GRB 161023A: Swift-XRT afterglow detection
  8. Konus-Wind observation of GRB 161023A
  9. GRB 161023A: TAROT La Silla observatory optical observations
  10. GRB 161023A: Zadko observatory - Gingin optical observations
  11. GRB 161023A: Watcher optical observations
  12. GRB 161023A: LCOGT-FTS optical observations
  13. GRB 161023A: Swift ToO observations
  14. Radio upper limit on the GRB 161011A with the GMRT
  15. GRB 161023A VLT/X-shooter redshift
  16. GRB 161023A: A long GRB detected by INTEGRAL
  17. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  18. Swift Trigger 718919 is not an astrophysical event.
  19. GRB 161022A: Swift-BAT refined analysis
  20. Swift Trigger 718766 is not an astrophysical event.
  21. GRB 161022A: RATIR Optical and NIR Observations
  22. GRB 161022A: Swift/UVOT Upper Limits
  23. GRB 161022A: Fermi GBM observation
  24. GRB 161022A: NOT optical observations
  25. Konus-Wind observation of GRB 161020B
  26. GRB 161022A: Swift-XRT refined Analysis
  27. IPN Triangulation of GRB 161020B
  28. GRB 161022A: LT observations
  29. GRB 161022A: TAROT Calern observatory optical observations
  30. GRB 161022A: Swift detection of a burst
  31. GRB 161020A: A long GRB detected by INTEGRAL
  32. GRB 161015A: further Swift-XRT follow-up observations
  33. GRB 161011A: 15 GHz upper limits from AMI
  34. GRB 161007A: 15 GHz upper limits from AMI
  35. Konus-Wind observation of GRB 161017A
  36. GRB161017A: NOEMA detection of the millimetre afterglow
  37. GRB 161017A: LT optical observations
  38. GRB161017A optical R band observations with SARA-RM
  39. GRB 161017A: TNG spectroscopy and redshift confirmation
  40. GRB 161017A: GTC additional spectroscopy and refined redshift
  41. GRB 161017A: Swift-BAT refined analysis
  42. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  43. GRB 161017A: Swift/UVOT Detection
  44. GRB 161017A: Swift-XRT refined Analysis
  45. GRB161017A: optical observations with 1-m LCOGT McDonald
  46. GRB 161017A: TNG optical observations
  47. GRB 161017A: MITSuME Akeno Optical Observation
  48. GRB 161017A: Redshift from GTC
  49. GRB 161017A: Fermi GBM observation
  50. GRB 161014A: Continued RATIR Optical and NIR Observations
  51. GRB 161015A: Swift/UVOT observations
  52. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  53. GRB161017.74 MASTER-Net OT detection
  54. Konus-Wind observation of GRB 161015A
  55. GRB 161014A: VLT/X-shooter redshift confirmation
  56. GRB161015A: AstroSat CZTI detection
  57. Konus-Wind observation of GRB 161014A
  58. GRB 161014A: refined analysis of TSHAO optical observations
  59. GRB 161015A: Swift-XRT observations
  60. GRB 161015A: Fermi GBM detection
  61. GRB 161015A: Tiled Swift observations
  62. GRB 161015A: Fermi-LAT detection
  63. GRB161004A: Further analysis of the burst nature
  64. GRB 161014A: RATIR Optical and NIR Observations
  65. GRB 161014A: Fermi GBM observation
  66. GRB 161014A: Swift-XRT refined Analysis
  67. GRB 161014A: Swift-BAT refined analysis
  68. GRB 161014A: TNG optical observations
  69. GRB 161014A: AROMA-N Optical Observation
  70. GRB 161014A: Continued MITSuME Akeno Optical Observation
  71. GRB 161014A: Swift/UVOT Detection
  72. GRB161014A: NOT optical observations
  73. GRB 161014A: GTC spectroscopy
  74. GRB 161014A: TSHAO optical observations
  75. GRB 161011A: RATIR Optical and NIR Observations
  76. GRB 161014A: Swift-XRT and UVOT afterglow detection
  77. GRB 161014A: Kanata optical observation
  78. GRB 161014A : Xinglong TNT optical observation
  79. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  80. GRB 161014A: MITSuME-Akeno optical observation
  81. GRB 161014A: Swift detection of a burst
  82. GRB 161010A: Swift/UVOT Possible Detection
  83. GRB 161010A: CALET Gamma-Ray Burst Monitor detection
  84. GRB 161011A, Swift-BAT refined analysis
  85. GRB 161011A: TSHAO afterglow candidate
  86. GRB 161011A: Swift/UVOT Upper Limits
  87. GRB 161011A: Swift-XRT refined Analysis
  88. Konus-Wind observation of GRB 161010A
  89. GRB 161010A: Swift-XRT afterglow detection
  90. GRB 161011A: Swift detection of a burst
  91. GRB 161010A: Swift ToO observations
  92. GRB 161010A: a long GRB detected by INTEGRAL
  93. GRB 161007A: NOT optical observations
  94. GRB 161007A: AbAO optical observations
  95. GRB 161007A: Mondy optical observations
  96. GRB 161007A: Swift-BAT refined analysis
  97. GRB 161007A: Swift/UVOT Upper Limits
  98. GRB 161007A: Swift-XRT refined Analysis
  99. GRB 161007A: GTC observations
  100. GRB 161004A: Maidanak optical observations

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