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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"

45740 results found.

  1. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  2. GRB 130427A in the Ep,i - Eiso plane
  3. GRB 130427A: Improved Swift-XRT analysis
  4. GRB 130425: MASTER-Net optical observations
  5. GRB 100728A: GROND host detection and X-shooter redshift
  6. GRB 130427B: MITSuME Ishigakijima upper limits
  7. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  8. GRB 130427A: Skynet/PROMPT Observations
  9. GRB 130427B: RATIR Optical and NIR Observations
  10. GRB 130427A: Nishi-Harima NIR Observations
  11. GRB 130427A: CARMA 3mm observations
  12. GRB 130427B: Tentative VLT/X-shooter redshift
  13. GRB 130427A : Xinglong TNT optical observation
  14. GRB 130427A: VLT/X-shooter redshift confirmation
  15. GRB 130427A optical time series
  16. GRB 130427A, Optical Observations
  17. Konus-Wind observation of GRB 130427A
  18. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  19. GRB 130427A: Swift-XRT refined Analysis
  20. GRB 130427A: SPI-ACS/INTEGRAL observations
  21. GRB 130427A: Continued RATIR Optical and NIR Observations
  22. GRB 130427A: CARMA 85 GHz detection
  23. GRB 130427A: SNUO/SOAO/BOAO Observation
  24. GRB 130427A: VLA 5 GHz detection
  25. GRB 130427B: Swift-XRT refined Analysis
  26. GRB 130427A: NOT optical photometry and redshift
  27. GRB 130427B: MITSuME Okayama upper limits
  28. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  29. GRB 130427A: T100 observations
  30. GRB 130427A: optical observations in CrAO
  31. GRB 130427A: Fermi GBM observation
  32. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  33. GRB 130427A: Fermi-LAT detection of a burst
  34. GRB 130427A: Swift-BAT refined analysis
  35. GRB 130427B: Swift-BAT refined analysis
  36. GRB 130427A: Zadko observatory - Gingin optical observations
  37. GRB 130427B: Enhanced Swift-XRT position
  38. GRB 130427A: GMG optical observation
  39. GRB 130427A: MITSuME Okayama Optical Observation
  40. GRB 130427A: Optical Observations
  41. GRB 130427A: MAXI/GSC detection
  42. GRB 130427B: Faulkes Telescope North afterglow detection
  43. GRB 130427B: Swift detection of a burst with optical counterpart
  44. GRB 130427A: RATIR Optical and NIR Observations
  45. GRB 130427A: Weihai optical observations
  46. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  47. GRB 130427A: Gemini-North redshift
  48. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  49. GRB 130427A: PAIRITEL NIR Detections
  50. GRB 130427A: Faulkes Telescope North detection
  51. GRB 130427A: P60 early detection
  52. GRB 130427A: early optical observations
  53. GRB 130427A: P60 early nondetection
  54. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  55. Konus-Wind observation of GRB 130425A
  56. IPN Triangulation of GRB 130425A
  57. GRB 130420A: Continued Skynet/GORT Observations/Detections
  58. GRB 130420B: CARMA and VLA radio observations
  59. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  60. GRB 130425A: Fermi GBM detection
  61. GRB 130420A: Continued RATIR Optical and NIR Observations
  62. GRB 130420A: ROTSE-III data analysis
  63. GRB 130420A: Continued RATIR Optical and NIR Observations
  64. GRB 130418A: Continued RATIR Optical and NIR Observations
  65. GRB 130420A: Redshift from 10.4m GTC
  66. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  67. GRB 130420B: Fermi GBM observation
  68. GRB 130418A: WSRT radio observation
  69. Swift Trigger 554135 is probably not a GRB or transient
  70. GRB 130420B: RATIR Optical and NIR Observations
  71. GRB 130420A: Continued RATIR Optical and NIR Observations
  72. GRB 130420B: Swift-XRT refined Analysis
  73. GRB 130420A: Fermi GBM observation
  74. GRB 130420A: ISON-NM optical observations
  75. Skynet/GORT observations of GRB130420A
  76. GRB 130420B: Weihai optical upper limit
  77. GRB 130420B: Swift/UVOT Upper Limits
  78. GRB 130420A: Swift/UVOT Detection
  79. GRB130420B: GMG optical upper limit
  80. GRB 130420A: Swift-XRT refined Analysis
  81. GRB 130420B: Enhanced Swift-XRT position
  82. GRB 130420B, Swift-BAT refined analysis
  83. GRB 130420A, Swift-BAT refined analysis
  84. GRB 130420A: GMG optical observation
  85. Konus-Wind observation of GRB 130418A
  86. GRB 130420A: Enhanced Swift-XRT position
  87. GRB130420A : Xinglong TNT optical upper limit
  88. GRB 130420B: Faulkes Telescope North observations
  89. GRB 130420A: Weihai Optical Observations
  90. GRB 130420B: MASTER-Net optical observations
  91. GRB 130420B: Swift detection of a burst
  92. GRB 130420A: RATIR Optical and NIR Observations
  93. GRB 130420A: PAIRITEL NIR detections
  94. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  95. GRB 130420A: Swift detection of a burst with an optical counterpart
  96. GRB 130420A: Faulkes Telescope North candidate
  97. GRB 130418A: Continued RATIR Optical and NIR Observations
  98. GRB 130418A: Swift-XRT refined Analysis
  99. Swift Trigger 553930 is not an astrophysical source
  100. GRB 130418A: SMARTS optical/IR afterglow observations

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