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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"

28263 results found.

  1. IPN Triangulation of GRB 160310A
  2. LIGO/Virgo G211117: EWE for NOWT follow-up of northern sky
  3. SGR 0755-2933, Swift-BAT refined analysis
  4. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  5. Swift detection of a likely new SGR: SGR 0755-2933
  6. GRB 160314A: Continued RATIR Optical and NIR Observations
  7. GRB 160313A: Mondy optical upper limit
  8. GRB 160314A: GROND optical/NIR observations
  9. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  10. GRB 160314B: Fermi GBM observation
  11. GRB 160314A: RATIR Optical and NIR Observations
  12. GRB 160314A: Mondy optical observations
  13. GRB 160313A: Swift/UVOT Upper Limits
  14. LIGO/Virgo G194575: EWE for NOWT follow-up of northern sky
  15. GRB 160314A: Swift-XRT refined Analysis
  16. GRB 160314A: Optical observations from OSN
  17. GRB 160314A: Swift-BAT refined analysis
  18. GRB 160314A: Swift/UVOT Detection
  19. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  20. GRB 160314A: Enhanced Swift-XRT position
  21. GRB 160314A: ISON-Ussuriysk optical upper limit
  22. GRB 160314A: Weihai optical upper limit
  23. GRB 160314A: Swift detection of a burst
  24. GRB 160313A, Swift-BAT refined analysis
  25. GRB 160313A: Chante-Perdrix Observatory optical observations
  26. GRB 160313A: Swift-XRT refined Analysis
  27. GRB 160313A: TAROT Calern observatory optical observations
  28. GRB 160313A: Enhanced Swift-XRT position
  29. GRB 160313A: RATIR Optical and NIR Observations
  30. GRB 160313A: SAO RAS observations
  31. GRB 160313A: Swift detection of a burst
  32. GRB 160310A: MASTER-Kislovods observations
  33. GRB 160310A: Further NOT observations
  34. GRB 160310A: Swift/UVOT Upper Limits
  35. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  36. GRB 160310A: RATIR Optical and NIR Observations
  37. GRB 160310A: NOT optical observations
  38. GRB 160310A: LCOGT-SAAO optical upper limits
  39. GRB 160310A: Swift-XRT observations
  40. GRB 160310A: Fermi GBM observation
  41. GRB 160303A: GTC imaging of possible host galaxy
  42. GRB 160310A: Fermi-LAT detection
  43. LIGO/Virgo G211117: HAWC follow-up of northern sky
  44. Swift trigger 677890 is noise
  45. GRB 160303A: Continued optical monitoring from NOT
  46. GRB160303A: further GROND observations
  47. GRB 160303A: 9.8 GHz VLA upper limit
  48. GRB 160303A, Swift-BAT refined analysis
  49. GRB 160303A: Continued RATIR Optical and NIR Observations
  50. GRB 160303A: GROND Optical Detection
  51. GRB 160303A: Observations from T150 OSN
  52. GRB 160303A: VLT/FORS2 afterglow obervations
  53. GRB 160303A: BOAO R-band Detection
  54. GRB 160303A: McDonald 2.1m CQUEAN Detection
  55. GRB 160303A iTelescope observation
  56. GRB 160303A: Swift-XRT refined Analysis
  57. GRB 160303A: Optical observations from the NOT
  58. GRB 160303A: Swift/UVOT Detection
  59. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  60. GRB 160303A: Enhanced Swift-XRT position
  61. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  62. GRB 160303A: MITSuME Akeno optical upper limits
  63. GRB 160303A: MITSuME Okayama upper limits
  64. GRB 160303A: ISON-NM early optical early limits
  65. GRB 160303A: Swift detection of a burst, possibly short
  66. GRB 160227A: LOAO 1.0m optical detection
  67. GRB 160227A: McDonald 0.8m Detection
  68. GRB 160228A: Swift/UVOT Upper Limits
  69. GRB 160227A: Swift/UVOT Detection
  70. GRB160228A: Further analyses on spectral lag and extended emission
  71. GRB 160228A: Mondy optcial observations
  72. GRB 160228A: RATIR Optical and NIR Observations
  73. GRB 160228A: Swift-XRT refined Analysis
  74. GRB 160227A: MASTER prompt OT Detection and LC
  75. GRB 160227A: AROMA-N Optical Observation
  76. GRB 160228A: GROND Afterglow Candidate
  77. GRB 160228A: Swift-BAT refined analysis
  78. GRB 160228A: optical observations
  79. GRB 160227B: Fermi GBM detection
  80. GRB 160228A: Enhanced Swift-XRT position
  81. GRB 160227A: NOT redshift
  82. GRB 160228A: Swift detection of a burst
  83. GRB 160227A, Swift-BAT refined analysis
  84. GRB 160227A: Swift-XRT refined Analysis
  85. GRB 160227A: Enhanced Swift-XRT position
  86. GRB 160227A: MAXI/GSC detection
  87. GRB 160225A: TSHAO optical afterglow detection
  88. GRB 160227A: ISON-Kislovodsk optical observation
  89. GRB 160227A: Mt. Terskol observatory optical observation
  90. GRB 160227A: MASTER OT Detection
  91. GRB 160227A: Swift detection of a burst with an optical counterpart
  92. GRB 160225A: LOAO optical upper limit
  93. GRB 160225B: Fermi GBM detection
  94. IPN Triangulation of GRB 160225B
  95. GRB 160225A: Continued RATIR Optical and NIR Observations
  96. GRB 160225A: Swift-BAT refined analysis
  97. GRB 160225A: RATIR Optical and NIR Observations
  98. GRB 160225A: Swift/UVOT Upper Limits
  99. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  100. GRB 160225A: Swift-XRT refined Analysis

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