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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"

28287 results found.

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

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