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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"

27487 results found.

  1. GRB 151127A: Swift/UVOT Upper Limits
  2. GRB 151127A: Swift-XRT refined Analysis
  3. GRB 151127A: Swift-BAT refined analysis
  4. GRB 151127A: GROND K-band upper limit
  5. GRB 151127A: Swift detection of a short burst
  6. GRB 151118A iTelescope observation
  7. GRB 151122A: Swift/UVOT Observations
  8. GRB 151122A: Swift-XRT observations
  9. GRB 151122A: Fermi GBM detection
  10. GRB 151122A: Swift ToO observations
  11. GRB 151122A: Swift detection of a burst
  12. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  13. Swift Trigger 664610 is not astrophysical
  14. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  15. Swift Trigger 664610: is unlikely a GRB
  16. GRB 151120A: Fermi GBM observation
  17. GRB 151120A: GROND optical/NIR afterglow
  18. GRB 151118A, Swift-BAT refined analysis
  19. GRB 151118A: ISON-NM early optical limit
  20. GRB 151118A: Swift-XRT refined Analysis
  21. GRB 151118A: Swift/UVOT Upper Limits
  22. GRB GRB 151118A: MASTER-NET optical observations
  23. GRB 151118A: Swift detection of a burst
  24. Swift-BAT resumption of normal operations
  25. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  26. GRB 151114A: Swift-XRT refined Analysis
  27. GRB 151114A: Swift-BAT refined analysis
  28. GRB 151112A: GROND photometric redshift and i'-band prediction
  29. GRB 151114A: Swift/UVOT Detection
  30. GRB 151114A: LCOGT-FTS afterglow observations
  31. GRB 151114A: Swift detection of a burst with an optical counterpart
  32. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  33. GRB 151112A: Swift/UVOT Upper Limits
  34. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  35. GRB 151112A: Swift-XRT refined Analysis
  36. GRB 151112A: Swift-BAT refined analysis
  37. GRB 151112A: MASTER-NET optical limit
  38. GRB 151112A: initial UVOT observations
  39. GRB 151112A: Swift-XRT observations
  40. GRB 151112A: Swift detection of a burst
  41. GRB 151111A: Swift/UVOT upper limits
  42. Swift-BAT trigger 663164 is not a burst.
  43. GRB 151111A: GROND marginal detection of a afterglow candidate
  44. GRB 151111A: Swift-XRT refined Analysis
  45. GRB 151111A: Fermi GBM observation
  46. GRB 151111A: LCOGT-FTS afterglow observations
  47. GRB 151111A: Swift-BAT refined analysis
  48. GRB 151111A: Swift detection of a burst
  49. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  50. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  51. LIGO/Virgo G194575: La Silla QUEST, Pan-STARRS and PESSTO observations of iPTF15dld
  52. GRB 151107A: Further investigation of the source nature
  53. GRB 151107B
  54. LIGO/Virgo G194575: Swift observations if iPTF15dld
  55. GRB 151107A, Swift-BAT refined analysis
  56. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  57. GRB 151107A: MASTER-NET optical observations
  58. GRB 151107A: Swift detection of a possible burst
  59. Swift-BAT triggers are disabled
  60. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  61. LIGO/Virgo G194575: MAXI/GSC further analysis
  62. GRB 151029A: FRAM optical afterglow detection
  63. GRB 151031A: GROND observation
  64. GRB 151027B: ATCA radio detection
  65. GRB 151031A: Swift/UVOT Detection
  66. GRB 151030A: Fermi GBM observation
  67. GRB 151031A: Swift-XRT refined Analysis
  68. GRB 151027B: RATIR Late-Time Upper Limits
  69. GRB 151031A: Swift-BAT refined analysis
  70. GRB 151031A: Swift detection of a burst
  71. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  72. Correction to the Trigger Time for Swift GRB 151029A
  73. GRB 151029A: Swift-XRT refined Analysis
  74. GRB 151029A: Swift/UVOT Detection
  75. GRB 151029A: LCOGT-FTS afterglow observations
  76. GRB 151029A: Swift-BAT refined analysis
  77. GRB 151027A: MAXI/GSC detection
  78. GRB 151029A: GROND afterglow observations
  79. GRB 151029A: Swift detection of a burst with an optical counterpart
  80. GRB 151027A: SAO RAS optical observations
  81. GRB 151027B: LCOGT FTN afterglow observations
  82. GRB 151027A: T100 observations
  83. GRB 151027B: Swift/UVOT Upper Limits
  84. Konus-Wind observation of GRB 151027A
  85. GRB 151027B: Swift-BAT refined analysis
  86. GRB 151027A: continued GMG observation
  87. GRB 151027B: RATIR Observations
  88. GRB 151027B: MASTER-NET early OT detection
  89. GRB 151027A: LCOGT-McDonald afterglow observations
  90. GRB 151027B: Swift-XRT refined Analysis
  91. GRB 151027B: GROND Optical/NIR Afterglow Detection
  92. GRB 151027A: UVOT Observations
  93. GRB 151027B: NOT optical afterglow candidate
  94. GRB 151027B: Swift detection of its 1000-th burst
  95. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  96. GRB 151027A: Swift-BAT refined analysis
  97. GRB 151027A: Early RAPTOR Observations
  98. LIGO/Virgo G194575: MASTER Optical Inspection
  99. GRB 151027A: GMG observation
  100. GRB 151027A: Fermi GBM observation

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