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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"

20532 results found.

  1. GRB 130427A: Skynet/PROMPT Observations
  2. GRB 130427B: RATIR Optical and NIR Observations
  3. GRB 130427A: Nishi-Harima NIR Observations
  4. GRB 130427A : Xinglong TNT optical observation
  5. GRB 130427A optical time series
  6. GRB 130427A, Optical Observations
  7. Konus-Wind observation of GRB 130427A
  8. GRB 130427A: Continued RATIR Optical and NIR Observations
  9. GRB 130427A: CARMA 85 GHz detection
  10. GRB 130427A: SNUO/SOAO/BOAO Observation
  11. GRB 130427B: Swift-XRT refined Analysis
  12. GRB 130427A: NOT optical photometry and redshift
  13. GRB 130427B: MITSuME Okayama upper limits
  14. GRB 130427A: T100 observations
  15. GRB 130427A: optical observations in CrAO
  16. GRB 130427A: Fermi-LAT detection of a burst
  17. GRB 130427A: Swift-BAT refined analysis
  18. GRB 130427A: Zadko observatory - Gingin optical observations
  19. GRB 130427B: Enhanced Swift-XRT position
  20. GRB 130427A: GMG optical observation
  21. GRB 130427A: MITSuME Okayama Optical Observation
  22. GRB 130427A: Optical Observations
  23. GRB 130427B: Swift detection of a burst with optical counterpart
  24. GRB 130427A: RATIR Optical and NIR Observations
  25. GRB 130427A: Weihai optical observations
  26. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  27. GRB 130427A: PAIRITEL NIR Detections
  28. GRB 130427A: early optical observations
  29. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  30. GRB 130420A: Continued Skynet/GORT Observations/Detections
  31. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  32. GRB 130420A: Continued RATIR Optical and NIR Observations
  33. GRB 130420A: Continued RATIR Optical and NIR Observations
  34. GRB 130418A: Continued RATIR Optical and NIR Observations
  35. GRB 130420B: Fermi GBM observation
  36. Swift Trigger 554135 is probably not a GRB or transient
  37. GRB 130420B: RATIR Optical and NIR Observations
  38. GRB 130420A: Continued RATIR Optical and NIR Observations
  39. GRB 130420B: Swift-XRT refined Analysis
  40. GRB 130420A: ISON-NM optical observations
  41. Skynet/GORT observations of GRB130420A
  42. GRB 130420B: Weihai optical upper limit
  43. GRB 130420B: Swift/UVOT Upper Limits
  44. GRB 130420A: Swift/UVOT Detection
  45. GRB130420B: GMG optical upper limit
  46. GRB 130420B: Enhanced Swift-XRT position
  47. GRB 130420A: GMG optical observation
  48. GRB 130420A: Enhanced Swift-XRT position
  49. GRB130420A : Xinglong TNT optical upper limit
  50. GRB 130420A: Weihai Optical Observations
  51. GRB 130420B: Swift detection of a burst
  52. GRB 130420A: RATIR Optical and NIR Observations
  53. GRB 130420A: PAIRITEL NIR detections
  54. GRB 130420A: Swift detection of a burst with an optical counterpart
  55. GRB 130418A: Continued RATIR Optical and NIR Observations
  56. GRB 130418A: SMARTS optical/IR afterglow observations
  57. GRB 130418A: Submm observations from SMA
  58. GRB 130419A, Swift-BAT refined analysis
  59. GRB 130327B: Swift/XRT source is not the afterglow
  60. Trigger 553930: Swift detection of a possible flare from HR 5110
  61. GRB 130418A: LOAO Observation
  62. GRB 130418A, Swift-BAT refined analysis
  63. GRB 130418A: REM NIR observations
  64. GRB 130418A: RATIR Optical and NIR Observations
  65. GRB 130418A: GROND detection of the optical-NIR afterglow
  66. GRB130418A: OSN 1.5m fading afterglow detection
  67. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  68. GRB 130418A: Enhanced Swift-XRT position
  69. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  70. GRB 130418A: TNG optical observations
  71. GRB 130418A: Bassano Bresciano Observatory optical observations
  72. GRB 130418A: 1.23m I-band observations
  73. GRB 130418A: Swift detection of a burst with an optical counterpart
  74. GRB 130408a: Skynet Optical Observations
  75. GRB 130408A: SMARTS optical/IR afterglow observations
  76. GRB 130408A: Zadko observatory - Gingin optical observations
  77. GRB 130407A: Swift-XRT observations
  78. GRB130408A: Swift/UVOT followup observations
  79. GRB 130408A: Enhanced Swift-XRT position
  80. GRB 130408A: GROND detection of the afterglow
  81. GRB 130408A: Swift detection of a burst
  82. GRB 130407A: MAXI/GSC detection
  83. GRB 130211A: Retraction of afterglow candidate
  84. Swift detection of IGR J18245-2452
  85. IPN Triangulation of GRB 130320B (very long/bright)
  86. Swift/XRT observation of GRB 130327B
  87. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  88. GRB 130310A: RATIR Observations
  89. Swift Trigger 552142 is a noise event
  90. Swift Trigger 552142: a possible GRB
  91. GRB 130327B: gamma-ray detection by AGILE
  92. GRB 130327A: Gemini Observations
  93. GRB 130327A: Weihai optical obsevations
  94. GRB 130327A: Swift/UVOT Upper Limits
  95. GRB 130327A: ISON-NM optical upper limit
  96. GRB 130327A: Enhanced Swift-XRT position
  97. GRB 130327A: RATIR Optical and NIR Observations
  98. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  99. GRB 130325A: Fermi LAT detection
  100. GRB 130327A: Swift detection of a burst

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