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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"

26546 results found.

  1. GRB 110521A: Swift-XRT refined analysis
  2. GRB 110520A: NOT optical follow-ups
  3. GRB 110521A - NOT optical observation
  4. GRB 110521A: Enhanced Swift-XRT position
  5. GRB 110521A: MASTER synchronous and early optical observations limit
  6. Swift/UVOT observations of GRB110520A
  7. GRB 110521A: Swift detection of a burst
  8. GRB 110520A: Swift-BAT refined analysis
  9. GRB 110520A: IAC80 I-band observations
  10. GRB 110520A: Swift-XRT refined Analysis
  11. GRB 110520A: Enhanced Swift-XRT position
  12. GRB 110520A: WHT IR observations
  13. GRB 110520A - NOT optical observation
  14. GRB 110520A: Liverpool Telescope Observations
  15. GRB 110520A: TAROT Calern observatory optical observations
  16. GRB 110520A: Swift detection of a burst
  17. IPN localization of bright GRB 110518A
  18. Radio observations of GRB 110428A with the EVLA
  19. GRB 110519A, Swift-BAT refined analysis
  20. GRB 110426A: Fermi GBM detection
  21. GRB 110428A: Fermi-GBM observation
  22. GRB 110503A: TAROT Calern observatory optical observations
  23. GRB 110503A: optical observation in CrAO
  24. GRB 110503A: Centimeter observation from EVLA
  25. GRB 110503A: Millimeter observation from SMA
  26. GRB 110503A: SARA-N Observations and Photometric Calibration
  27. GRB 110503A: Swift/UVOT Observations
  28. GRB 110503A: Swift-XRT refined Analysis
  29. GRB 110503A: PAIRITEL NIR Detection
  30. GRB 110503A: Enhanced Swift-XRT position
  31. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  32. GRB 110426A: Swift/XRT non-detection
  33. GRB 110428A : X-ray afterglow confirmation
  34. GRB 110428A: Suzaku WAM observation of the prompt emission
  35. GRB 110422A: optical observations in CrAO
  36. GRB 110428A : Swift-XRT observations
  37. Konus-Wind observation of GRB 110428A
  38. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  39. GRB 110426A: MAXI/GSC detection of a GRB
  40. GRB 110422A: optical observations in CrAO, second epoch
  41. GRB 110422A: Herschel observation scheduled
  42. GRB110422A: NOT optical follow-ups
  43. GRB 110422A: optical observations in CrAO
  44. GRB110422A: MITSuME Ishigakijima Optical Observation
  45. Konus-Wind observation of GRB 110422A
  46. GRB 110422A: Further NOT observation
  47. GRB 110422A: Swift/UVOT Detection of optical afterglow
  48. GRB 110422A: Swift-XRT refined Analysis
  49. GRB 110422A: Enhanced Swift-XRT position
  50. GRB 110422A: TNG optical observations
  51. GRB 110422A: SAO RAS optical observations
  52. GRB 110422A: NOT optical observation
  53. GRB 110422A: Mondy optical observations
  54. GRB 110422A: Swift detection of a burst
  55. GRB 110420B: Swift/UVOT Upper Limits
  56. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  57. GRB 110420B: Swift-XRT afterglow candidate retraction
  58. GRB 110420B: Fermi GBM observation
  59. Konus-Wind observation of GRB 110420A
  60. GRB 110420B: Spectral lag indicates short hard burst
  61. GRB 110420B, GROND observations
  62. GRB 110420A Swift/UVOT Observations
  63. GRB 110420B: Swift-XRT afterglow candidate
  64. GRB 110420A: Swift-XRT refined Analysis
  65. GRB 110420A: Enhanced Swift-XRT position
  66. GRB 110420A: Swift detection of a burst with optical counterpart
  67. GRB110414A: MITSuME Ishigakijima Optical upper limits
  68. GRB 110414A: GROND upper limits
  69. GRB110414A: MITSuME Okayama Optical upper limits
  70. GRB 110414A: Swift/UVOT Upper limits
  71. GRB 110414A: Swift-XRT refined Analysis
  72. GRB 110414A: Enhanced Swift-XRT position
  73. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  74. GRB 110414A : Faulkes Telescope North observations
  75. GRB 110414A: Swift detection of a burst
  76. GRB 110411A: PAIRITEL NIR Upper Limits
  77. GRB 110411A: Swift-XRT refined Analysis
  78. GRB 110412A: Fermi GBM observation
  79. GRB 110411A: Swift/UVOT Upper Limits
  80. GRB 110411A: Enhanced Swift-XRT position
  81. GRB 110411A: Swift detection of a burst
  82. GRB 110407A: Swift-XRT refined Analysis
  83. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  84. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  85. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  86. GRB110407A: UVOT Upper Limits
  87. GRB 110407A: GROND Detection of the Optical Afterglow
  88. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  89. GRB 110407A: NOT optical observations
  90. GRB 110407A: Enhanced Swift-XRT position
  91. IPN triangulation of the bright GRB110406A
  92. GRB 110407A: Swift detection of a burst
  93. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  94. GRB 110402A: fading optical afterglow
  95. GRB 110402A: Suzaku WAM observation of the prompt emission
  96. GRB 110328/Swift J164449.3+573451: Chandra observations
  97. GRB 110402A: LOAO Optical Observation
  98. GRB 110328A / Swift J164449.3+573451, HST Observations
  99. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  100. GRB 110401A: Fermi GBM detection

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