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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"

5188 results found.

  1. GRB 151001A: Swift-XRT refined Analysis
  2. LIGO/Virgo G184098: Liverpool Telescope Spectroscopy of PS15ccx
  3. GRB 150925A: Swift-XRT refined Analysis
  4. LIGO/Virgo G184098: optical transient search with Kiso Schmidt telescope and KWFC on behalf of J-GEM collaboration
  5. Konus-Wind observation of GRB 150919A
  6. ANTARES neutrino detection: Fermi GBM Observations
  7. LIGO/Virgo G184098: TAROT network optical observations
  8. LIGO/Virgo G184098: MWA Followup
  9. LIGO/Virgo G184098: VST-ESO PARANAL observations
  10. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  11. GRB 150915A: Swift detection of a burst
  12. GRB 150911A: Swift-XRT refined Analysis
  13. GRB 150910A: Swift-XRT refined Analysis
  14. GRB 150907B: Swift-XRT refined Analysis
  15. Fermi GBM trigger 463339482/150907725 is too weak to be classified
  16. GRB 150906A: Fermi GBM detection
  17. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  18. GRB 150902A: MASTER-SAAO optical observations
  19. GRB 150831B: Swift-XRT refined Analysis
  20. GRB 150831B: MASTER-IAC early optical observations
  21. GRB 150831A: Swift-XRT refined Analysis
  22. INTEGRAL detection of GRB 150831A
  23. GRB 150824A: Fermi GBM detection
  24. GRB 150821A: Swift-XRT refined Analysis
  25. GRB 150819A: Swift-XRT refined Analysis
  26. GRB 150818A: Swift-XRT update, correction to GCN 18162
  27. GRB 150817A: AAO optical observations
  28. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  29. GRB 150817A: Swift-XRT refined Analysis
  30. GRB 150811A: Swift-XRT refined Analysis
  31. GRB 150801B: Swift-XRT refined Analysis
  32. GRB 150727A: Swift-XRT refined Analysis
  33. Konus-Wind observation of GRB 150725A
  34. GRB 150724B: Fermi GBM detection
  35. GRB 150724B: Fermi-LAT detection
  36. Swift IGR J00291+5934: MASTER Optical flare detection
  37. GRB 150724A: Swift-BAT refined analysis
  38. GRB 150722A: Swift-XRT refined Analysis
  39. GRB 150720A: Swift-XRT refined Analysis
  40. GRB 150716A: Swift-XRT refined Analysis
  41. GRB 150711A: Swift-XRT refined Analysis
  42. GRB 150711A: Swift detection of a burst
  43. GRB 150710A: host galaxy for Swift XRT second candidate
  44. IPN Triangulation of GRB 150702A
  45. GRB 150627A: Swift-XRT afterglow detection
  46. GRB 150626B: MASTER observations
  47. GRB 150626B: Swift detection of a burst
  48. GRB 150626A: Swift-XRT refined Analysis
  49. V404 Cyg: MASTER Swift, Integral alert observations
  50. GRB 150616A: Swift-BAT refined analysis
  51. GRB 150616A: Swift-XRT refined Analysis
  52. GRB 150607A: Swift-XRT refined Analysis
  53. GRB 150530A: Swift-XRT refined Analysis
  54. GRB 150523A: LCOGT FTS afterglow confirmation
  55. GRB 150523A: Fermi GBM detection
  56. GRB 150518A: MITSuME Akeno Optical observation
  57. GRB 150430A: Swift-XRT refined Analysis
  58. GRB 150428B: Swift-XRT refined Analysis
  59. GRB 150428B: MASTER-net prompt optical observation
  60. GRB 150428A: Swift-XRT refined Analysis
  61. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  62. GRB 150428A: GROND Dark Burst Host Candidate
  63. GRB 150428A: Swift detection of a burst
  64. GRB 150424A: Swift-XRT refined Analysis
  65. GRB 150424A: 10.4m GTC spectroscopy
  66. GRB 150424A: GROND detects strong fading
  67. GRB 150424B: Fermi GBM detection
  68. GRB 150423A: Swift-XRT refined Analysis
  69. GRB 150423A: GROND observation
  70. Konus-Wind observation of a bright burst from SGR 1935+2154
  71. IPN Triangulation of a bright burst from SGR 1935+2154
  72. GRB 150413A: MAXI/GSC detection
  73. Swift triggered on a source in Terzan 5 (trigger=637212)
  74. GRB 150404A: Fermi GBM detection
  75. GRB 150403A: Swift-XRT refined Analysis
  76. GRB 150323C: MITSuME Akeno Optical observation
  77. GRB 150323B; Konkoly optical observations
  78. GRB 150323C: Mondy optical observations
  79. GRB 150323B : Xinglong TNT upper limit
  80. GRB 150323C: Swift-XRT refined Analysis
  81. GRB 150323A: Swift-XRT refined Analysis
  82. GRB 150318A: Swift-XRT refined Analysis
  83. GRB 150318A: Skynet PROMPT-CTIO Observations
  84. GRB 150317A: Swift-XRT refined Analysis
  85. GRB 150317A: Swift detection of a burst
  86. GRB 150314A: Swift-XRT refined Analysis
  87. GRB 150313A: MAXI/GSC detection
  88. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  89. GRB 150309A: Swift-XRT refined Analysis
  90. GRB 150302A: MITSuME Okayama upper limits
  91. GRB 150302A: Swift-XRT refined Analysis
  92. GRB 150301B: Swift-XRT refined Analysis
  93. GRB 150301A: Swift-XRT refined Analysis
  94. GRB 150301A: Fermi GBM observation
  95. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  96. Fermi GBM Observations of Magnetar 4U 0142+61
  97. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  98. GRB 150222A: Further GROND Observations
  99. GRB 150222A: Swift-XRT refined Analysis
  100. GRB 150222B: MAXI/GSC detection

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