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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"

27600 results found.

  1. GRB 151205A, Swift-BAT refined analysis
  2. GRB 151205B: MASTER-NET early optical observations
  3. GRB 151205A: Fermi GBM detection
  4. GRB 151205A: Garching Telescope Upper Limit
  5. GRB151205B: Initial UVOT observations
  6. GRB 151205B: Swift-XRT observations
  7. GRB 151205A: Swift/UVOT Upper Limits
  8. GRB 151205B: Swift detection of a burst
  9. GRB 151205A: Swift detection of a burst
  10. GRB 151127A iTelescope observation
  11. Fermi GBM trigger 470712580/151202062 is not a GRB
  12. Fermi GBM trigger 470290196/151127174 is not a GRB
  13. Fermi GBM trigger 470375959/151128166 is not a GRB
  14. GRB 151127A: Swift/UVOT Upper Limits
  15. GRB 151127A: Swift-XRT refined Analysis
  16. GRB 151127A: Swift-BAT refined analysis
  17. GRB 151127A: GROND K-band upper limit
  18. GRB 151127A: Swift detection of a short burst
  19. GRB 151118A iTelescope observation
  20. GRB 151122A: Swift/UVOT Observations
  21. GRB 151122A: Swift-XRT observations
  22. GRB 151122A: Fermi GBM detection
  23. GRB 151122A: Swift ToO observations
  24. GRB 151122A: Swift detection of a burst
  25. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  26. Swift Trigger 664610 is not astrophysical
  27. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  28. Swift Trigger 664610: is unlikely a GRB
  29. GRB 151120A: Fermi GBM observation
  30. GRB 151120A: GROND optical/NIR afterglow
  31. GRB 151118A, Swift-BAT refined analysis
  32. GRB 151118A: ISON-NM early optical limit
  33. GRB 151118A: Swift-XRT refined Analysis
  34. GRB 151118A: Swift/UVOT Upper Limits
  35. GRB GRB 151118A: MASTER-NET optical observations
  36. GRB 151118A: Swift detection of a burst
  37. Swift-BAT resumption of normal operations
  38. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  39. GRB 151114A: Swift-XRT refined Analysis
  40. GRB 151114A: Swift-BAT refined analysis
  41. GRB 151112A: GROND photometric redshift and i'-band prediction
  42. GRB 151114A: Swift/UVOT Detection
  43. GRB 151114A: LCOGT-FTS afterglow observations
  44. GRB 151114A: Swift detection of a burst with an optical counterpart
  45. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  46. GRB 151112A: Swift/UVOT Upper Limits
  47. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  48. GRB 151112A: Swift-XRT refined Analysis
  49. GRB 151112A: Swift-BAT refined analysis
  50. GRB 151112A: MASTER-NET optical limit
  51. GRB 151112A: initial UVOT observations
  52. GRB 151112A: Swift-XRT observations
  53. GRB 151112A: Swift detection of a burst
  54. GRB 151111A: Swift/UVOT upper limits
  55. Swift-BAT trigger 663164 is not a burst.
  56. GRB 151111A: GROND marginal detection of a afterglow candidate
  57. GRB 151111A: Swift-XRT refined Analysis
  58. GRB 151111A: Fermi GBM observation
  59. GRB 151111A: LCOGT-FTS afterglow observations
  60. GRB 151111A: Swift-BAT refined analysis
  61. GRB 151111A: Swift detection of a burst
  62. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  63. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  64. LIGO/Virgo G194575: La Silla QUEST, Pan-STARRS and PESSTO observations of iPTF15dld
  65. GRB 151107A: Further investigation of the source nature
  66. GRB 151107B
  67. LIGO/Virgo G194575: Swift observations if iPTF15dld
  68. GRB 151107A, Swift-BAT refined analysis
  69. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  70. GRB 151107A: MASTER-NET optical observations
  71. GRB 151107A: Swift detection of a possible burst
  72. Swift-BAT triggers are disabled
  73. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  74. LIGO/Virgo G194575: MAXI/GSC further analysis
  75. GRB 151029A: FRAM optical afterglow detection
  76. GRB 151031A: GROND observation
  77. GRB 151027B: ATCA radio detection
  78. GRB 151031A: Swift/UVOT Detection
  79. GRB 151030A: Fermi GBM observation
  80. GRB 151031A: Swift-XRT refined Analysis
  81. GRB 151027B: RATIR Late-Time Upper Limits
  82. GRB 151031A: Swift-BAT refined analysis
  83. GRB 151031A: Swift detection of a burst
  84. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  85. Correction to the Trigger Time for Swift GRB 151029A
  86. GRB 151029A: Swift-XRT refined Analysis
  87. GRB 151029A: Swift/UVOT Detection
  88. GRB 151029A: LCOGT-FTS afterglow observations
  89. GRB 151029A: Swift-BAT refined analysis
  90. GRB 151027A: MAXI/GSC detection
  91. GRB 151029A: GROND afterglow observations
  92. GRB 151029A: Swift detection of a burst with an optical counterpart
  93. GRB 151027A: SAO RAS optical observations
  94. GRB 151027B: LCOGT FTN afterglow observations
  95. GRB 151027A: T100 observations
  96. GRB 151027B: Swift/UVOT Upper Limits
  97. Konus-Wind observation of GRB 151027A
  98. GRB 151027B: Swift-BAT refined analysis
  99. GRB 151027A: continued GMG observation
  100. GRB 151027B: RATIR Observations

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