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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"

28275 results found.

  1. GRB160325A: REM NIR observations
  2. GRB 160325A: Swift detection of a burst
  3. Swift detects GX 301-2 in very high state
  4. GRB 160321A: AbAO optical observations
  5. GRB 160321A: Possible RATIR Optical and NIR Detections
  6. GRB 160321A: Swift/UVOT Upper Limits
  7. GRB 160321A: Swift-BAT refined analysis
  8. GRB 160321A: Swift-XRT refined Analysis
  9. GRB 160316A: CALET Gamma-Ray Burst Monitor detection
  10. GRB 160321A: Enhanced Swift-XRT position
  11. GRB 160321A: Swift detection of a probable burst
  12. GRB 160310A: Terskol 2-m observations
  13. IPN Triangulation of GRB 160310A
  14. LIGO/Virgo G211117: EWE for NOWT follow-up of northern sky
  15. SGR 0755-2933, Swift-BAT refined analysis
  16. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  17. Swift detection of a likely new SGR: SGR 0755-2933
  18. GRB 160314A: Continued RATIR Optical and NIR Observations
  19. GRB 160313A: Mondy optical upper limit
  20. GRB 160314A: GROND optical/NIR observations
  21. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  22. GRB 160314B: Fermi GBM observation
  23. GRB 160314A: RATIR Optical and NIR Observations
  24. GRB 160314A: Mondy optical observations
  25. GRB 160313A: Swift/UVOT Upper Limits
  26. LIGO/Virgo G194575: EWE for NOWT follow-up of northern sky
  27. GRB 160314A: Swift-XRT refined Analysis
  28. GRB 160314A: Optical observations from OSN
  29. GRB 160314A: Swift-BAT refined analysis
  30. GRB 160314A: Swift/UVOT Detection
  31. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  32. GRB 160314A: Enhanced Swift-XRT position
  33. GRB 160314A: ISON-Ussuriysk optical upper limit
  34. GRB 160314A: Weihai optical upper limit
  35. GRB 160314A: Swift detection of a burst
  36. GRB 160313A, Swift-BAT refined analysis
  37. GRB 160313A: Chante-Perdrix Observatory optical observations
  38. GRB 160313A: Swift-XRT refined Analysis
  39. GRB 160313A: TAROT Calern observatory optical observations
  40. GRB 160313A: Enhanced Swift-XRT position
  41. GRB 160313A: RATIR Optical and NIR Observations
  42. GRB 160313A: SAO RAS observations
  43. GRB 160313A: Swift detection of a burst
  44. GRB 160310A: MASTER-Kislovods observations
  45. GRB 160310A: Further NOT observations
  46. GRB 160310A: Swift/UVOT Upper Limits
  47. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  48. GRB 160310A: RATIR Optical and NIR Observations
  49. GRB 160310A: NOT optical observations
  50. GRB 160310A: LCOGT-SAAO optical upper limits
  51. GRB 160310A: Swift-XRT observations
  52. GRB 160310A: Fermi GBM observation
  53. GRB 160303A: GTC imaging of possible host galaxy
  54. GRB 160310A: Fermi-LAT detection
  55. LIGO/Virgo G211117: HAWC follow-up of northern sky
  56. Swift trigger 677890 is noise
  57. GRB 160303A: Continued optical monitoring from NOT
  58. GRB160303A: further GROND observations
  59. GRB 160303A: 9.8 GHz VLA upper limit
  60. GRB 160303A, Swift-BAT refined analysis
  61. GRB 160303A: Continued RATIR Optical and NIR Observations
  62. GRB 160303A: GROND Optical Detection
  63. GRB 160303A: Observations from T150 OSN
  64. GRB 160303A: VLT/FORS2 afterglow obervations
  65. GRB 160303A: BOAO R-band Detection
  66. GRB 160303A: McDonald 2.1m CQUEAN Detection
  67. GRB 160303A iTelescope observation
  68. GRB 160303A: Swift-XRT refined Analysis
  69. GRB 160303A: Optical observations from the NOT
  70. GRB 160303A: Swift/UVOT Detection
  71. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  72. GRB 160303A: Enhanced Swift-XRT position
  73. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  74. GRB 160303A: MITSuME Akeno optical upper limits
  75. GRB 160303A: MITSuME Okayama upper limits
  76. GRB 160303A: ISON-NM early optical early limits
  77. GRB 160303A: Swift detection of a burst, possibly short
  78. GRB 160227A: LOAO 1.0m optical detection
  79. GRB 160227A: McDonald 0.8m Detection
  80. GRB 160228A: Swift/UVOT Upper Limits
  81. GRB 160227A: Swift/UVOT Detection
  82. GRB160228A: Further analyses on spectral lag and extended emission
  83. GRB 160228A: Mondy optcial observations
  84. GRB 160228A: RATIR Optical and NIR Observations
  85. GRB 160228A: Swift-XRT refined Analysis
  86. GRB 160227A: MASTER prompt OT Detection and LC
  87. GRB 160227A: AROMA-N Optical Observation
  88. GRB 160228A: GROND Afterglow Candidate
  89. GRB 160228A: Swift-BAT refined analysis
  90. GRB 160228A: optical observations
  91. GRB 160227B: Fermi GBM detection
  92. GRB 160228A: Enhanced Swift-XRT position
  93. GRB 160227A: NOT redshift
  94. GRB 160228A: Swift detection of a burst
  95. GRB 160227A, Swift-BAT refined analysis
  96. GRB 160227A: Swift-XRT refined Analysis
  97. GRB 160227A: Enhanced Swift-XRT position
  98. GRB 160227A: MAXI/GSC detection
  99. GRB 160225A: TSHAO optical afterglow detection
  100. GRB 160227A: ISON-Kislovodsk optical observation

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