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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"

28292 results found.

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

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