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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"

12396 results found.

  1. GRB 160119A: Swift/UVOT Upper Limits
  2. LIGO/Virgo G184098: MASTER final result
  3. GRB 160119A: GROND optical/NIR afterglow observations
  4. GRB 160119A: RATIR Optical and NIR Observations
  5. GRB 160117B: RATIR Optical and NIR Observations
  6. GRB 160119A: Swift detection of a burst
  7. GRB 160117A: Swift/UVOT Upper Limits
  8. GRB 151228B: AbAO optical upper limit
  9. GRB 160117A: Swift-XRT observations
  10. GRB 160117B: MASTER-Amur OT observations
  11. LIGO/Virgo G211117: Further Swift-XRT sources
  12. Konus-Wind observation of GRB 160111A
  13. GRB 160113A: Swift-XRT observations
  14. Konus-Wind observation of GRB 160107A
  15. GRB 160104A: Swift/UVOT Detection
  16. LIGO/Virgo G211117: Swift observations of PS15dpn
  17. GRB 160107A: MAXI/GSC detection
  18. Konus-Wind observation of GRB 160101A
  19. Konus-Wind observation of GRB 151225A
  20. LIGO/Virgo G211117: Further Swift-XRT sources
  21. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  22. GRB 160104A: GWAC upper limit during prompt emission phase
  23. GRB 160104A: MITSuME Okayama upper limits
  24. GRB 160104A: MASTER early OT detection
  25. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  26. GRB 160104B: MAXI/GSC detection
  27. GRB 160102A: Swift-XRT observations
  28. GRB 160101A: MITSuME Akeno optical upper limits
  29. GRB 160102A: MAXI/GSC detection
  30. GRB 160101A: Swift/UVOT Detection
  31. GRB 160101A: MAXI/GSC detection
  32. LIGO/Virgo G211117: MAXI/GSC observations
  33. LIGO/Virgo G211117: INAF TNG follow-up of MASTER OT J020906.21+013800.1
  34. GRB 151228A: Correction to GCN 18770
  35. GRB 151228B: Swift/UVOT Detection
  36. GRB 151229A: MITSuME Akeno optical upper limits
  37. GRB 151229A: MITSuME Okayama upper limits
  38. GRB 151228B: MITSuME Akeno optical upper limits
  39. GRB 151229A: Swift/UVOT observations
  40. LIGO/Virgo G211117: Further Swift-XRT sources
  41. GRB 151228A: MITSuME Akeno optical upper limits
  42. GRB 151229A: Swift detection of a short burst
  43. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  44. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  45. LIGO/Virgo G211117: Further Swift-XRT sources
  46. GRB 151212A iTelescope observation
  47. GRB151215A: Continued P60 Observations
  48. GRB 151216A: MAXI/GSC detection
  49. GRB 151215A: MITSuME Akeno optical upper limits
  50. GRB151215A: Swift/UVOT detection
  51. GRB 151215A: Swift detection of a burst
  52. GRB151212A: Swift/UVOT observations
  53. GRB 151212A: GROND Optical Afterglow Candidate
  54. GRB 151212A: MAXI/GSC detection
  55. GRB 151210A: Swift/UVOT Upper Limits
  56. GRB 151205A: Khureltogot upper limit
  57. GRB 151205B: Deep GROND Upper limits
  58. GRB 130831A: MASTER early OT detection and LC
  59. GRB 151205B: further Swift-XRT observations
  60. GRB 151205C: Swift-XRT observations
  61. GRB 151205C: MAXI/GSC detection
  62. GRB 151205B: MASTER-NET early optical observations
  63. GRB 151205A: Garching Telescope Upper Limit
  64. GRB151205B: Initial UVOT observations
  65. GRB 151205A: Swift/UVOT Upper Limits
  66. GRB 151205A: Swift detection of a burst
  67. GRB 151127A iTelescope observation
  68. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  69. GRB 151127A: Swift/UVOT Upper Limits
  70. GRB 151127A: GROND K-band upper limit
  71. GRB 151127A: LCOGT-SSO optical upper limits
  72. GRB 151118A iTelescope observation
  73. GRB 151122A: Swift/UVOT Observations
  74. GRB 151122A: Swift-XRT observations
  75. Swift Trigger 664610 is not astrophysical
  76. Swift Trigger 664610: is unlikely a GRB
  77. GRB 151118A: MITSuME Akeno optical upper limits
  78. GRB 151118A: AAO optical upper limit
  79. GRB 151118A: Swift/UVOT Upper Limits
  80. GRB GRB 151118A: MASTER-NET optical observations
  81. GRB 151114A: Swift/UVOT Detection
  82. GRB 151112A: Swift/UVOT Upper Limits
  83. GRB 151112A: MAXI/GSC detection
  84. GRB 151111A: Swift/UVOT upper limits
  85. GRB 151111A: Swift detection of a burst
  86. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  87. GRB 151107A: Further investigation of the source nature
  88. LIGO/Virgo G194575: Swift observations if iPTF15dld
  89. GRB 151107A: MASTER-NET optical observations
  90. LIGO/Virgo G194575: MAXI/GSC further analysis
  91. GRB 151031A: MITSuME Akeno optical upper limits
  92. GRB 151031A: GROND observation
  93. GRB 151031A
  94. GRB 151031A: Swift/UVOT Detection
  95. GRB 151027B: RATIR Late-Time Upper Limits
  96. GRB 151029A: MITSuME Ishigakijima upper limits
  97. GRB 151029A: Swift/UVOT Detection
  98. GRB 151027A: MAXI/GSC detection
  99. GRB 151029A VLT/X-shooter redshift
  100. GRB 151029A: GROND afterglow observations

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