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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"

37682 results found.

  1. GRB 161022A: Prompt enhanced Swift-XRT position
  2. GRB 161022A: Swift detection of a burst
  3. GRB 161020A: A long GRB detected by INTEGRAL
  4. GRB 161015A: further Swift-XRT follow-up observations
  5. GRB 161011A: 15 GHz upper limits from AMI
  6. GRB 161007A: 15 GHz upper limits from AMI
  7. Konus-Wind observation of GRB 161017A
  8. GRB161017A: NOEMA detection of the millimetre afterglow
  9. GRB 161017A: LT optical observations
  10. GRB 161017A: TNG spectroscopy and redshift confirmation
  11. GRB 161017A: GTC additional spectroscopy and refined redshift
  12. GRB 161017A: Swift-BAT refined analysis
  13. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  14. GRB 161017A: Swift/UVOT Detection
  15. GRB 161017A: Swift-XRT refined Analysis
  16. GRB161017A: optical observations with 1-m LCOGT McDonald
  17. GRB 161017A: TNG optical observations
  18. GRB 161017A: MITSuME Akeno Optical Observation
  19. GRB 161017A: Redshift from GTC
  20. GRB 161017A: Fermi GBM observation
  21. GRB 161017A: Enhanced Swift-XRT position
  22. GRB 161014A: Continued RATIR Optical and NIR Observations
  23. GRB 161015A: Swift/UVOT observations
  24. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  25. Konus-Wind observation of GRB 161015A
  26. GRB 161014A: VLT/X-shooter redshift confirmation
  27. GRB161015A: AstroSat CZTI detection
  28. Konus-Wind observation of GRB 161014A
  29. GRB 161014A: refined analysis of TSHAO optical observations
  30. GRB 161015A: Swift-XRT observations
  31. GRB 161015A: Fermi GBM detection
  32. GRB 161015A: Tiled Swift observations
  33. GRB 161015A: Fermi-LAT detection
  34. GRB161004A: Further analysis of the burst nature
  35. GRB 161014A: RATIR Optical and NIR Observations
  36. GRB 161014A: Fermi GBM observation
  37. GRB 161014A: Swift-XRT refined Analysis
  38. GRB 161014A: Swift-BAT refined analysis
  39. GRB 161014A: TNG optical observations
  40. GRB 161014A: AROMA-N Optical Observation
  41. GRB 161014A: Continued MITSuME Akeno Optical Observation
  42. GRB 161014A: Swift/UVOT Detection
  43. GRB161014A: NOT optical observations
  44. GRB 161014A: GTC spectroscopy
  45. GRB 161014A: TSHAO optical observations
  46. GRB 161011A: RATIR Optical and NIR Observations
  47. GRB 161014A: Swift-XRT and UVOT afterglow detection
  48. GRB 161014A: Kanata optical observation
  49. GRB 161014A : Xinglong TNT optical observation
  50. GRB 161014A: MITSuME-Akeno optical observation
  51. GRB 161014A: Swift detection of a burst
  52. GRB 161010A: Swift/UVOT Possible Detection
  53. GRB 161010A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 161011A, Swift-BAT refined analysis
  55. GRB 161011A: Swift burst of interest
  56. GRB 161011A: TSHAO afterglow candidate
  57. GRB 161011A: Swift/UVOT Upper Limits
  58. GRB 161011A: Swift-XRT refined Analysis
  59. Konus-Wind observation of GRB 161010A
  60. GRB 161011A: Enhanced Swift-XRT position
  61. GRB 161010A: Swift-XRT afterglow detection
  62. GRB 161011A: Prompt enhanced Swift-XRT position
  63. GRB 161011A: Swift detection of a burst
  64. GRB 161010A: Swift ToO observations
  65. GRB 161010A: a long GRB detected by INTEGRAL
  66. GRB 161007A: NOT optical observations
  67. GRB 161007A: AbAO optical observations
  68. GRB 161007A: Mondy optical observations
  69. GRB 161007A: Swift-BAT refined analysis
  70. GRB 161007A: Swift/UVOT Upper Limits
  71. GRB 161007A: Swift-XRT refined Analysis
  72. GRB 161007A: GTC observations
  73. GRB 161007A: Enhanced Swift-XRT position
  74. GRB 161004A: Maidanak optical observations
  75. GRB 161004A: refined analysis of TSHAO optical observations
  76. GRB 161007A: Prompt enhanced Swift-XRT position
  77. GRB 161007A: MASTER-net early optical observations
  78. GRB 161007A: Swift detection of a burst
  79. GRB 160821A: Maisoncelles observatory optical observations
  80. GRB 160925A: Kottamia R-band observation
  81. Konus-Wind observation of GRB 161004B
  82. GRB 160927A: GTC observations
  83. GRB 161004B: CALET Gamma-Ray Burst Monitor detection
  84. GRB 160927A: CALET Gamma-Ray Burst Monitor ground detection
  85. GRB 161004A: Swift-BAT refined analysis
  86. GRB 150302A: late-time imaging and optical afterglow confirmation
  87. GRB 161001A: IRSF upper limits
  88. GRB 161004B: Fermi GBM detection
  89. GRB 161004B: Swift/UVOT Upper Limits
  90. GRB161004B: AstroSat CZTI detection
  91. GRB 161004B: Swift-BAT refined analysis
  92. GRB 161004B: Swift-XRT refined Analysis
  93. GRB 161004A: RATIR Optical and NIR Observations
  94. GRB 160917B: Lomonosov BDRG gamma ray discovery
  95. GRB 161004B: Enhanced Swift-XRT position
  96. GRB 160917A: Lomonosov BDRG gamma ray detection
  97. GRB 160915A: Lomonosov BDRG gamma ray detection
  98. GRB 161004B: Prompt enhanced Swift-XRT position
  99. GRB 161004B: Swift detection of a burst
  100. GRB 161004A: SAO RAS optical upper limit

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