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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. LIGO/Virgo G184098: DESGW followup program
  2. LIGO/Virgo G184098: SkyMapper observations
  3. LIGO/Virgo G184098: TAROT network optical observations
  4. LIGO/Virgo G184098: MWA Followup
  5. LIGO/Virgo G184098: DESGW followup program
  6. LIGO/Virgo observing run 1 (O1) starts 2015-09-18 15:00 UTC
  7. LIGO/Virgo G184098: Keck II DEIMOS Spectra of iPTF Optical Candidates
  8. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  9. LIGO/Virgo G184098: iPTF Optical Transient Candidates
  10. LIGO/Virgo G184098: VST-ESO PARANAL observations
  11. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  12. LIGO/Virgo G184098: observations by MASTER
  13. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  14. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  15. GRB 150910A: AAO optical observations
  16. GRB150915A : IRSF NIR upper limits
  17. GRB 150910A: Mt. Terskol observatory optical observations
  18. GRB 150910A: TSHAO optical observations
  19. GRB 150915A: GROND detection of an optical counterpart candidate
  20. GRB 150915A: MASTER-NET optical observations
  21. GRB 150915A: Swift detection of a burst
  22. GRB 150910A: Continued RATIR Observations
  23. GRB 150911A: Chuguev observatory upper limit
  24. GRB 150911A: Mt. Terskol observatory upper limit
  25. GRB 150911A: Khureltogot upper limit
  26. GRB 150910A: Mt. Terskol observatory optical observation
  27. GRB 150912A: MITSuME Ishigakijima upper limits
  28. GRB 150910A: RATIR Observations
  29. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  30. GRB 150912A: MASTER-IAC optical observations
  31. GRB150910A: P60 Observations
  32. GRB150911A: P60 Observations
  33. GRB 150910A: AAO optical observations
  34. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  35. GRB 150910A: Chuguev observatory optical observations
  36. GRB 150911A: MITSuME Okayama upper limits
  37. GRB 150910A: TSHAO optical observations
  38. GRB 150910A: MITSuME Ishigakijima Optical Observation
  39. GRB 150910A: SAO RAS optical photometry
  40. GRB 150910A: MITSuME Okayama Optical Observation
  41. GRB 150910A: LCOGT FTN afterglow observations
  42. GRB 150910A: KAIT Optical Afterglow Detection
  43. GRB 150910A: Swift detection of a burst with an optical afterglow
  44. IPN Triangulation of GRB 150906B (short/intense)
  45. GRB 150907B: MASTER-SAAO early optical observations
  46. GRB 150907B: GROND Upper Limits
  47. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  48. GRB 150902A: MASTER-SAAO optical observations
  49. GRB 150902A: Fermi-LAT detection
  50. GRB 150831B: MASTER-IAC early optical observations
  51. IPN Triangulation of GRB 150824A
  52. Konus-Wind observation of GRB 150821A
  53. GRB 150819A: Mondy and TSHAO optical upper limits
  54. GRB 150821A: Fermi GBM detection
  55. GRB 150821A: Swift detection of a burst with an optical afterglow
  56. GRB 150818A: MITSuME Ishigakijima upper limits
  57. GRB 150819A: Prompt enhanced Swift-XRT position
  58. GRB 150817A: Swift detection of a burst
  59. GRB 150811A: KAIT Refined Analysis
  60. GRB 150811A: Swift detection of a burst
  61. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  62. GRB 150801A: MAXI/GSC detection
  63. GRB 150727A: Swift detection of a burst with an optical counterpart
  64. GRB 150724A: Enhanced Swift-XRT position
  65. GRB 150724A: Prompt enhanced Swift-XRT position
  66. GRB 150724A: Swift detection of a burst
  67. GRB 150722A: Swift detection of a burst
  68. Swift Trigger 649706: a possible GRB or bright Galactic transient
  69. GRB 150716A: Swift detection of a burst
  70. GRB 150711A: Swift detection of a burst
  71. IPN Triangulation of GRB 150702A
  72. GRB 150626A: Swift detection of a burst
  73. V404 Cyg: MASTER Swift, Integral alert observations
  74. GRB 150616A: Watcher optical upper limit
  75. Swift triggers again on V404 Cyg
  76. Swift Trigger 644520 is V404 Cyg
  77. GRB 150616A: Swift detection of a burst
  78. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  79. Optical follow-up of Swift trigger on V404 Cyg
  80. GRB 150608A: MITSuME Akeno optical upper limits
  81. GRB 150607A: Swift/UVOT Detection
  82. GRB 150607A: Swift detection of a burst with an optical counterpart
  83. GRB 150523A: Suzaku WAM observation of the prompt emission
  84. Konus-Wind observation of GRB 150523A
  85. GRB 150523A: Fermi-LAT detection
  86. GRB 150523A: Fermi GBM detection
  87. GRB 150518A: Correction
  88. GRB 150424A: 9.8 GHz VLA detection
  89. GRB 150430A: GROND Upper Limits
  90. GRB 150413A: CrAO optical observations
  91. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  92. GRB 150428B: Swift detection of a burst
  93. GRB 150424A: GROND detects strong fading
  94. GRB 150424A: NOT optical observations
  95. GRB 150424B: Fermi GBM detection
  96. GRB 150424A: Swift/UVOT Observations
  97. GRB 150424B: MAXI/GSC detection
  98. GRB 150424A: Keck detection of optical afterglow
  99. GRB 150424A: Swift detection of a short burst
  100. Swift trigger 638589 is probably not an astrophysical source

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