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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

3403 results found.

  1. IPN Triangulation of GRB 150922A (short/hard)
  2. LIGO/Virgo G184098: VST-ESO PARANAL observations
  3. GRB 150907A: Swift-XRT afterglow detection
  4. GRB 150911A: Swift-BAT refined analysis
  5. GRB 150911A: MITSuME Okayama upper limits
  6. IPN Triangulation of GRB 150906B (short/intense)
  7. GRB 150907B: Swift-BAT refined analysis
  8. GRB150907A: Swift/UVOT observations
  9. GRB 150907A: Swift-XRT observations
  10. GRB 150907A: Tiled Swift observations
  11. GRB 150907A: MAXI/GSC detection
  12. GRB 150831B: MASTER-IAC early optical observations
  13. GRB 150831A: Swift detection of a short burst
  14. IPN Triangulation of GRB 150824A
  15. GRB 150819A: Mondy and TSHAO optical upper limits
  16. GRB 150821A: Fermi GBM detection
  17. GRB 150821A: Swift detection of a burst with an optical afterglow
  18. Konus-Wind observation of GRB 150819B
  19. GBM Trigger 150813665 is not a GRB
  20. GRB 150801A: Swift-XRT observations
  21. GRB 150801A: Tiled Swift observations
  22. GRB 150801A: MAXI/GSC detection
  23. GRB 150728A: FTN observations
  24. GRB 150724B: MASTER upper limit
  25. Konus-Wind observation of GRB 150725A
  26. GRB 150725A: MAXI/GSC detection
  27. GRB 150722A: Swift detection of a burst
  28. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  29. GRB 150710B refined analysis
  30. GRB 150710B detected in ground analysis of BAT data
  31. Swift-XRT observations of GRB 150710A
  32. GRB 150702A: MASTER-SAAO inspection
  33. GRB 150702A: Swift-XRT observations
  34. GRB 150622A: Swift-XRT afterglow detection
  35. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  36. GRB 150627A: MASTER-SAAO OT Detection
  37. GRB 150622A: Swift-XRT observations
  38. GRB 150622A: Tiled Swift observations
  39. GRB 150622A: MAXI/GSC detection
  40. GRB 150616A: Swift-BAT refined analysis
  41. GRB 150608A: Swift-XRT follow-up observations
  42. Konus-Wind observation of GRB 150608A
  43. GRB 150608A: Swift-XRT afterglow detection
  44. GRB 150608A: Tiled Swift observations
  45. GRB 150608A: MAXI/GSC detection
  46. Konus-Wind observation of GRB 150607A
  47. GRB 150607A: Swift-BAT refined analysis
  48. GRB 150607A: Swift detection of a burst with an optical counterpart
  49. GRB 150518A: possible SN observations
  50. Konus-Wind observation of GRB 150530A
  51. GRB 150527A: MITSuME Okayama upper limits
  52. GRB 150518A: MAXI-GSC further analysis
  53. GRB 150518A: Mondy optical observations
  54. GRB 150518A: AMI 15 GHz detection of possible radio counterpart
  55. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  56. Konus-Wind observation of GRB 150518A
  57. GRB 150518A: Swift-XRT follow-up observations
  58. GRB 150518A: Correction
  59. GRB 150518A: VLT/X-shooter redshift of the likely host galaxy
  60. Swift/UVOT observations of GRB150518A
  61. GRB 150518A: Swift-XRT afterglow detection
  62. GRB 150518A: Tiled Swift observations
  63. GRB 150518A: MAXI/GSC detection
  64. Konus-Wind observation of GRB 150430A
  65. GRB 150430A: Fermi GBM Detection
  66. GRB 150430A: MAXI/GSC detection
  67. GRB 150428C: Swift-XRT observations
  68. GRB 150428B: Swift-BAT refined analysis
  69. GRB 150428C: Tiled Swift observations
  70. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  71. GRB 150428A: Danish1.56m optical observations
  72. GRB 150428A: Enhanced Swift-XRT position
  73. GRB 150428A: GROND Dark Burst Host Candidate
  74. GRB 150428B: Swift detection of a burst
  75. GRB 150428A: Swift detection of a burst
  76. Trigger 639199: Swift detection of IGRJ16418-4532
  77. GRB 150424A: NOT optical observations
  78. GRB 150424B: Fermi GBM detection
  79. Konus-Wind observation of GRB 150424A
  80. GRB 150424B: Tiled Swift observations
  81. GRB 150424B: MAXI/GSC detection
  82. GRB 150424A: Swift detection of a short burst
  83. GRB 150422A: Fermi GBM detection
  84. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  85. Konus-Wind observation of GRB 150418A
  86. GRB150418A: Swift/UVOT did not detect a new source
  87. GRB 150418A: Swift-XRT observations
  88. GRB 150418A: Tiled Swift observations
  89. GRB 150418A: MAXI/GSC detection
  90. GRB 150413A: MAXI/GSC detection
  91. GRB 150413A: MASTER bright OT detection
  92. Konus-Wind observation of GRB 150403A
  93. GRB 150323C: Khureltogot optical observations
  94. IPN Triangulation of GRB 150330A (long/very intense)
  95. GRB 141121A: GMG observation
  96. GRB 150323A: P60 Optical Afterglow Candidate
  97. GRB 150314A: KAIT Optical Observations
  98. GRB 150314A: KAIT Optical Candidate
  99. GRB 150313A: MAXI/GSC detection
  100. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB

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