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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"

21805 results found.

  1. GRB 130504C: Fermi GBM detection
  2. GRB 130502A: optical upper limit
  3. Konus-Wind observation of GRB 130505A
  4. GRB 130504C: Fermi-LAT detection of a burst
  5. Swift/UVOT observations of GRB130505A
  6. GRB 130505A: Xinglong TNT optical observations
  7. GRB 130505A; Weihai optical observations
  8. GRB 130505A: Enhanced Swift-XRT position
  9. GRB 130505A: MITSuME Okayama Optical Observation
  10. Konus-Wind observation of GRB 130504B
  11. GRB 130504A: IAC80 optical candidate
  12. GRB 130505A: Swift detection of a burst with optical afterglow
  13. GRB 130504A: MITSuME Okayama upper limits
  14. IPN Triangulation of GRB 130504B
  15. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  16. GRB 130504A: Enhanced XRT position
  17. GRB 130502B: Suzaku WAM observation of the prompt emission
  18. GRB 130504A: Swift/UVOT Upper Limits
  19. GRB 130502B: possible TNG counterpart
  20. Trigger 555096: Swift detection of a possible burst
  21. GRB 130427A: Non-observation of VHE emission with HAWC
  22. GRB130502A: MASTER-Net optical observations
  23. IPN Triangulation of GRB 130502B
  24. GRB 130502B: Swift/UVOT Upper Limits
  25. GRB 130502A: Swift/UVOT Upper Limits
  26. Konus-Wind observation of GRB 130502B
  27. GRB 130502B: P60 Observations
  28. GRB 130502B Swift-XRT observations
  29. GRB 130502A: RATIR Optical and NIR Observations
  30. GRB 130418A: TNG NIR observations
  31. GRB 130502A: Enhanced Swift-XRT position
  32. GRB 130427A: MITSuME Ishigakijima Optical Observation after 5 days
  33. GRB 130502A: TNG candidate counterpart
  34. GRB 130502A: T100 Observations
  35. GRB 130502A: Swift detection of a burst
  36. GRB 130425A: Suzaku WAM observation of the prompt emission
  37. GRB 130427A: Nishi-Harima Optical Spectroscopic Observations
  38. GRB 130427A: Continued RATIR Optical and NIR Observations
  39. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  40. GRB 130427A: Challis Observatory optical observations
  41. GRB 130427A: Continued Skynet/PROMPT Observations
  42. GRB 130427A: SARA-N detection
  43. GRB 130427A: Continued RATIR Optical and NIR Observations
  44. GRB 130427A: CrAO RT-22 36 GHz observation
  45. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  46. GRB 130425: MASTER-Net optical observations
  47. GRB 100728A: GROND host detection and X-shooter redshift
  48. GRB 130427B: MITSuME Ishigakijima upper limits
  49. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  50. GRB 130427A: Skynet/PROMPT Observations
  51. GRB 130427B: RATIR Optical and NIR Observations
  52. GRB 130427A: Nishi-Harima NIR Observations
  53. GRB 130427A : Xinglong TNT optical observation
  54. GRB 130427A optical time series
  55. GRB 130427A, Optical Observations
  56. Konus-Wind observation of GRB 130427A
  57. GRB 130427A: Continued RATIR Optical and NIR Observations
  58. GRB 130427A: CARMA 85 GHz detection
  59. GRB 130427A: VLA 5 GHz detection
  60. GRB 130427A: NOT optical photometry and redshift
  61. GRB 130427B: MITSuME Okayama upper limits
  62. GRB 130427A: T100 observations
  63. GRB 130427A: optical observations in CrAO
  64. GRB 130427A: Fermi GBM observation
  65. GRB 130427A: Fermi-LAT detection of a burst
  66. GRB 130427A: Zadko observatory - Gingin optical observations
  67. GRB 130427B: Enhanced Swift-XRT position
  68. GRB 130427A: GMG optical observation
  69. GRB 130427A: MITSuME Okayama Optical Observation
  70. GRB 130427B: Swift detection of a burst with optical counterpart
  71. GRB 130427A: RATIR Optical and NIR Observations
  72. GRB 130427A: Weihai optical observations
  73. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  74. GRB 130427A: PAIRITEL NIR Detections
  75. GRB 130427A: early optical observations
  76. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  77. Konus-Wind observation of GRB 130425A
  78. GRB 130420A: Continued Skynet/GORT Observations/Detections
  79. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  80. GRB 130420A: Continued RATIR Optical and NIR Observations
  81. GRB 130420A: Continued RATIR Optical and NIR Observations
  82. GRB 130418A: Continued RATIR Optical and NIR Observations
  83. Swift Trigger 554135 is probably not a GRB or transient
  84. GRB 130420B: RATIR Optical and NIR Observations
  85. GRB 130420A: Continued RATIR Optical and NIR Observations
  86. GRB 130420B: Swift-XRT refined Analysis
  87. GRB 130420A: Fermi GBM observation
  88. GRB 130420A: ISON-NM optical observations
  89. Skynet/GORT observations of GRB130420A
  90. GRB 130420B: Weihai optical upper limit
  91. GRB 130420B: Swift/UVOT Upper Limits
  92. GRB 130420A: Swift/UVOT Detection
  93. GRB130420B: GMG optical upper limit
  94. GRB 130420B: Enhanced Swift-XRT position
  95. GRB 130420B, Swift-BAT refined analysis
  96. GRB 130420A: GMG optical observation
  97. Konus-Wind observation of GRB 130418A
  98. GRB 130420A: Enhanced Swift-XRT position
  99. GRB130420A : Xinglong TNT optical upper limit
  100. GRB 130420A: Weihai Optical Observations

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