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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"

24550 results found.

  1. GRB 160325A: Fermi GBM detection
  2. GRB 160321A: Swift-BAT refined analysis
  3. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  4. LIGO/Virgo G211117: EWE for NOWT follow-up of northern sky
  5. SGR 0755-2933, Swift-BAT refined analysis
  6. GRB 160314A: GROND optical/NIR observations
  7. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  8. GRB 160314B: Fermi GBM observation
  9. GRB 160314B: Fermi-LAT detection
  10. LIGO/Virgo G194575: EWE for NOWT follow-up of northern sky
  11. GRB 160314A: Swift-BAT refined analysis
  12. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  13. GRB 160313A, Swift-BAT refined analysis
  14. GRB 160313A: MASTER-Net optical observations
  15. GRB 160313A: LT observations
  16. GRB 160310A: MASTER-Kislovods observations
  17. GRB 160310A: Further NOT observations
  18. GRB 160310A: RATIR Optical and NIR Observations
  19. GRB 160310A: NOT optical observations
  20. GRB 160310A: Swift-XRT observations
  21. GRB 160310A: Fermi GBM observation
  22. GRB 160310A: Fermi-LAT detection
  23. Swift Trigger 678197 is a noise fluctuation
  24. LIGO/Virgo G211117: HAWC follow-up of northern sky
  25. Trigger 677981: Swift detection of IGRJ17091-3624
  26. Swift trigger 677890 is noise
  27. GRB160303A: further GROND observations
  28. GRB 160303A, Swift-BAT refined analysis
  29. GRB 160303A: MMT Optical Detection
  30. GRB 160303A: GROND Optical Detection
  31. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  32. GRB 160303A: MITSuME Akeno optical upper limits
  33. GRB 160303A: LCOGT-FTN optical observations
  34. GRB 160303A: MITSuME Okayama upper limits
  35. GRB 160227A: LOAO 1.0m optical detection
  36. GRB160228A: Further analyses on spectral lag and extended emission
  37. GRB 160228A: MASTER-Amur prompt observations
  38. GRB 160227A: MASTER prompt OT Detection and LC
  39. GRB 160227A: AROMA-N Optical Observation
  40. GRB 160228A: GROND Afterglow Candidate
  41. GRB 160228A: Swift-BAT refined analysis
  42. GRB 160227B: Fermi GBM detection
  43. GRB 160227A: NOT redshift
  44. GRB 160228A: Swift detection of a burst
  45. GRB 160227A, Swift-BAT refined analysis
  46. GRB 160227A: Swift-XRT refined Analysis
  47. GRB 160227A: MAXI/GSC detection
  48. GRB 160227A: MASTER OT Detection
  49. GRB 160225A: LOAO optical upper limit
  50. GRB 160225B: Fermi GBM detection
  51. IPN Triangulation of GRB 160225B
  52. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  53. GRB 160225A: Swift-BAT refined analysis
  54. GRB 160225A: MASTER-Amur observations
  55. GRB 160225A: Xinglong TNT optical observation
  56. GRB 160225A: MITSuME Okayama Optical Observation
  57. GRB 160225A: MITSuME Akeno Optical Observation
  58. GRB 160223A: RATIR Optical and NIR Observations
  59. GRB 160225A: MASTER-Amur early observations
  60. GRB 160225A: Swift detection of a burst
  61. GRB 160223A: Swift-XRT afterglow detection
  62. GRB 160223B: MASTER-Amur early observations
  63. GRB 160223A: Swift-BAT refined analysis
  64. GRB 160223B: Khureltogot optical observations
  65. GRB 160223A: Fermi GBM observation
  66. GRB 160223B: LCOGT-FTN optical observations
  67. GRB 160223B: Fermi GBM observation
  68. GRB 160223B: A long GRB detected by INTEGRAL
  69. GRB 160223A: GROND optical/NIR afterglow
  70. GRB 160221A: Fermi GBM observation
  71. GRB 160221A: GROND upper limits
  72. GRB 160220B: Further GROND Observations
  73. GRB 160221A: Swift-XRT observations
  74. GRB 160221A: MASTER-SAAO early observations
  75. GRB 160221A: A long GRB detected by INTEGRAL
  76. Konus-Wind observation of GRB 160220B
  77. GRB 160220B: Swift-BAT refined analysis
  78. GRB 160220B: GROND Observations
  79. GRB 160219A: Fermi GBM detection
  80. GRB 160220A: Swift-BAT refined analysis
  81. IPN Triangulation of GRB 160219A (short/hard)
  82. Swift Trigger 674752 is likely a noise fluctuation in the direction of IGR17488-3253
  83. GRB 160220B: Swift detection of a burst
  84. GRB 160220A: MASTER-Amur observations
  85. GRB 160220A: GROND Optical/NIR Upper Limits
  86. GRB 160220A: Fermi GBM observation
  87. GRB 160220A: Swift-XRT observations
  88. GRB 160220A: Swift detection of a burst
  89. LIGO/Virgo G184098: MASTER arhival results
  90. GRB 160216A: Swift-BAT refined analysis
  91. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  92. LIGO/Virgo G184098: MAXI/GSC search for an X-ray counterpart of GW150914
  93. GRB160131A: detection of polarisation by Astrosat CZTI
  94. GRB 160206A: Kiso/KWFC optical observations
  95. GRB 160206B: Fermi GBM detection
  96. LIGO/Virgo G211117: LOFAR follow-up
  97. GRB 160203A: MITSuME Akeno optical upper limits
  98. GRB 151215A: TAROT Calern observatory very early optical detection
  99. GRB 160203A: Swift-BAT refined analysis
  100. GRB 160206A: Swift-XRT observations

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