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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"

5859 results found.

  1. GRB160131.35 MASTER-Net OT detection
  2. GRB 160121A: GROND Afterglow observations
  3. LIGO/Virgo G184098: MASTER final result
  4. Konus-Wind observation of GRB 160113A
  5. GRB 160117B: Swift detection of a burst with optical counterpart
  6. IPN Triangulation of GRB 160113A
  7. GRB 151225A: Correction to the trigger time of GCN 18724
  8. GRB 160113A: Fermi GBM detection
  9. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  10. LIGO/Virgo G184098: Updated FAR estimate
  11. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  12. GRB 160107A: MAXI/GSC detection
  13. Konus-Wind observation of GRB 151225A
  14. IPN Triangulation of GRB 151225A (short/hard)
  15. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  16. LIGO/Virgo G211117: LOFAR follow-up
  17. LIGO/Virgo G211117: PESSTO classification of Pan-STARRS transients
  18. LIGO/Virgo G211117: MASTER OTs 26.XII.2015 - 01.I.2016
  19. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  20. LIGO/Virgo G211117: MAGIC very-high energy gamma-ray observations
  21. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  22. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  23. GRB 151229A: MITSuME Akeno optical upper limits
  24. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  25. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  26. GRB 151229A: MITSuME Okayama upper limits
  27. GRB 151228B: MITSuME Akeno optical upper limits
  28. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  29. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  30. GRB 151228B: Swift detection of a burst with an optical detection
  31. GRB 151225A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  32. V404Cyg Swift Trigger 668097:
  33. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  34. GRB 151215A: MITSuME Akeno optical upper limits
  35. LIGO/Virgo G184098: LOFAR follow-up
  36. GRB 151205C: Optical follow-up observations at Kiso
  37. Swift detection of 4U 1850-03
  38. GRB 130831A: MASTER early OT detection and LC
  39. GRB 151205A: Swift detection of a burst
  40. GRB 151127A iTelescope observation
  41. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  42. Fermi GBM trigger 470290196/151127174 is not a GRB
  43. GRB 151127A: GROND K-band upper limit
  44. GRB 151127A: Swift detection of a short burst
  45. GRB 151027A: Maidanak optical observations
  46. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  47. GRB 151118A: MITSuME Akeno optical upper limits
  48. GRB 151118A: AAO optical upper limit
  49. GRB 151114A: Swift detection of a burst with an optical counterpart
  50. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  51. GRB 151112A: MASTER-NET optical limit
  52. GRB 151111A: GROND marginal detection of a afterglow candidate
  53. LIGO/Virgo G194575: VLA follow-up
  54. GRB 151111A: LCOGT-FTS afterglow observations
  55. GRB 151111A: Swift-BAT refined analysis
  56. GRB 151111A: Enhanced Swift-XRT position
  57. GRB 151111A: Swift detection of a burst
  58. LIGO/Virgo G194575: La Silla QUEST, Pan-STARRS and PESSTO observations of iPTF15dld
  59. GRB 151027A: Mondy optical observations
  60. GRB 150910A: CrAO optical observations
  61. GRB 151027A: Optical counterpart detection
  62. GRB 151029A: LCOGT-FTS afterglow observations
  63. GRB 151027A: LCOGT-McDonald afterglow observations
  64. GRB 151027A: VLA detection
  65. GRB 151027A: THO optical observations
  66. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  67. GRB 151027A: MITSuME Akeno Optical observation
  68. LIGO/Virgo G194575: GROND multi-color observations
  69. GRB 151027A: Weihai optical observations
  70. GRB 151027A : ISON-NM early optical detection
  71. GRB 151027A: KAIT optical afterglow confirmation
  72. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  73. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  74. LIGO/Virgo G194575: Near-infrared follow-up with OAO-WFC
  75. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  76. GRB 151021A: MITSuME Okayama upper limits
  77. LIGO/Virgo G184098: LOFAR follow-up
  78. Konus-Wind observation of GRB 151006A
  79. GRB 151006A: Fermi-LAT detection
  80. GRB 151006A: Fermi GBM detection
  81. GRB 151006A: MITSuME Okayama upper limits
  82. GRB 151006A: Prompt enhanced Swift-XRT position
  83. GRB 151006A: Swift detection of a burst
  84. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  85. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  86. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  87. Swift Trigger 657564: XRT prompt analysis
  88. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  89. Swift Trigger 657564: a probable GRB
  90. LIGO/Virgo G184098: Ongoing gravitational-wave analysis
  91. GRB 151001B: Swift detection of a burst
  92. LIGO/Virgo G184098: spectral classification of PS15cci
  93. LIGO/Virgo G184098: Liverpool Telescope Spectroscopy of PS15ccx
  94. GRB 150925A: Swift detection of a burst
  95. LIGO/Virgo G184098: LOFAR follow-up
  96. LIGO/Virgo G184098: ASKAP followup
  97. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  98. LIGO/Virgo G184098: optical transient search with Kiso Schmidt telescope and KWFC on behalf of J-GEM collaboration
  99. LIGO/VIRGO G184098 : classifications of transients from the LSQ observations
  100. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission

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