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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"

3060 results found.

  1. LIGO/Virgo G211117: LOFAR follow-up
  2. Konus-Wind observation of GRB 160325A
  3. GRB 160321A: Swift detection of a probable burst
  4. GRB 160313A: Mondy optical upper limit
  5. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  6. GRB 160310A: NOT optical observations
  7. GRB 160310A: LCOGT-SAAO optical upper limits
  8. GRB 160303A: MITSuME Okayama upper limits
  9. GRB 160227B: Fermi GBM detection
  10. GRB 160228A: Swift detection of a burst
  11. GRB 160227A, Swift-BAT refined analysis
  12. GRB 160225A: WHT LIRIS observations
  13. Konus-Wind observation of GRB 160220B
  14. GRB 160220B: Swift-BAT refined analysis
  15. LIGO/Virgo G211117: LOFAR follow-up
  16. GRB 160131A: AbAO optical observations
  17. GRB 160131A: Khureltogot optical observations
  18. GRB160131.35 MASTER-Net OT detection
  19. GRB 160127A: Swift-BAT refined analysis
  20. LIGO/Virgo G211117: Further Swift-XRT sources
  21. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  22. GRB 160107A: MAXI/GSC detection
  23. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  24. GRB 160104B: MAXI/GSC detection
  25. LIGO/Virgo G211117: LOFAR follow-up
  26. LIGO/Virgo G211117: PESSTO classification of Pan-STARRS transients
  27. GRB 160101A: MAXI/GSC detection
  28. LIGO/Virgo G211117: LBT follow-up imaging of iPTF15fhq
  29. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  30. GRB 151228B: Swift/UVOT Detection
  31. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  32. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  33. GRB 151228B: Swift-BAT refined analysis
  34. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  35. GRB 151228B: Swift detection of a burst with an optical detection
  36. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  37. GRB 151212A: GROND Optical Afterglow Candidate
  38. GRB 151212A: Swift-XRT afterglow detection
  39. GRB 151210A: Swift-BAT refined analysis
  40. GRB 130831A: MASTER early OT detection and LC
  41. GRB 151205A: Garching Telescope Upper Limit
  42. GRB 151111A: Swift-BAT refined analysis
  43. GRB 151031A: Swift detection of a burst
  44. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  45. GRB 151029A: Swift-BAT refined analysis
  46. GRB 151027A: SAO RAS optical observations
  47. LIGO/Virgo G194575: Near-infrared follow-up with OAO-WFC
  48. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  49. GRB 151021B: Fermi GBM detection
  50. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  51. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  52. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  53. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  54. IPN Triangulation of GRB 150922A (short/hard)
  55. LIGO/Virgo G184098: VST-ESO PARANAL observations
  56. GRB 150911A: Swift-BAT refined analysis
  57. GRB 150911A: MITSuME Okayama upper limits
  58. IPN Triangulation of GRB 150906B (short/intense)
  59. GRB 150907B: Swift-BAT refined analysis
  60. GRB 150831B: MASTER-IAC early optical observations
  61. GRB 150831A: Swift detection of a short burst
  62. IPN Triangulation of GRB 150824A
  63. GRB 150819A: Mondy and TSHAO optical upper limits
  64. GRB 150821A: Fermi GBM detection
  65. GRB 150821A: Swift detection of a burst with an optical afterglow
  66. Konus-Wind observation of GRB 150819B
  67. GBM Trigger 150813665 is not a GRB
  68. GRB 150728A: FTN observations
  69. GRB 150724B: MASTER upper limit
  70. GRB 150722A: Swift detection of a burst
  71. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  72. GRB 150710B refined analysis
  73. GRB 150710B detected in ground analysis of BAT data
  74. Swift-XRT observations of GRB 150710A
  75. GRB 150702A: MASTER-SAAO inspection
  76. GRB 150702A: Swift-XRT observations
  77. GRB 150627A: MASTER-SAAO OT Detection
  78. GRB 150616A: Swift-BAT refined analysis
  79. GRB 150608A: MAXI/GSC detection
  80. Konus-Wind observation of GRB 150607A
  81. GRB 150607A: Swift-BAT refined analysis
  82. GRB 150607A: Swift detection of a burst with an optical counterpart
  83. Konus-Wind observation of GRB 150530A
  84. GRB 150527A: MITSuME Okayama upper limits
  85. GRB 150430A: Fermi GBM Detection
  86. GRB 150428B: Swift-BAT refined analysis
  87. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  88. GRB 150428A: Danish1.56m optical observations
  89. GRB 150428A: Enhanced Swift-XRT position
  90. GRB 150428A: GROND Dark Burst Host Candidate
  91. GRB 150428B: Swift detection of a burst
  92. GRB 150428A: Swift detection of a burst
  93. Trigger 639199: Swift detection of IGRJ16418-4532
  94. GRB 150424A: NOT optical observations
  95. Konus-Wind observation of GRB 150424A
  96. GRB 150424A: Swift detection of a short burst
  97. GRB 150422A: Fermi GBM detection
  98. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  99. GRB 150413A: MASTER bright OT detection
  100. Konus-Wind observation of GRB 150403A

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