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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

21269 results found.

  1. GRB 110426A: Fermi GBM detection
  2. GRB 110503A: TAROT Calern observatory optical observations
  3. Konus-Wind observation of GRB 110503A
  4. GRB 110503A: optical observation in CrAO
  5. GRB 110503A: Centimeter observation from EVLA
  6. GRB 110503A: Millimeter observation from SMA
  7. GRB 110503A: SARA-N Observations and Photometric Calibration
  8. GRB 110503A: Swift/UVOT Observations
  9. GRB 110503A: PAIRITEL NIR Detection
  10. GRB 110503A: Swift-BAT refined analysis
  11. GRB 110503A: Enhanced Swift-XRT position
  12. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  13. GRB 110426A: Swift/XRT non-detection
  14. GRB 110428A : X-ray afterglow confirmation
  15. GRB 110428A: Suzaku WAM observation of the prompt emission
  16. GRB 110422A: optical observations in CrAO
  17. GRB 110428A : Swift-XRT observations
  18. Konus-Wind observation of GRB 110428A
  19. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  20. GRB 110422A: optical observations in CrAO, second epoch
  21. GRB 110422A: Suzaku WAM observation of the prompt emission
  22. GRB110422A: NOT optical follow-ups
  23. GRB 110422A: optical observations in CrAO
  24. GRB110422A: MITSuME Ishigakijima Optical Observation
  25. Konus-Wind observation of GRB 110422A
  26. GRB 110422A: Further NOT observation
  27. GRB 110422A: Swift/UVOT Detection of optical afterglow
  28. GRB 110422A: THO optical observations
  29. GRB 110422A: Enhanced Swift-XRT position
  30. GRB 110422A: TNG optical observations
  31. GRB 110422A: SAO RAS optical observations
  32. GRB 110422A: NOT optical observation
  33. GRB 110422A: Swift-BAT refined analysis
  34. GRB 110422A: Mondy optical observations
  35. GRB 110422A: Swift detection of a burst
  36. GRB 110420B: Swift/UVOT Upper Limits
  37. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  38. GRB 110420B: Swift-XRT afterglow candidate retraction
  39. GRB 110420B, GROND observations
  40. GRB 110420A Swift/UVOT Observations
  41. GRB 110420A: Enhanced Swift-XRT position
  42. GRB 110420A: Swift detection of a burst with optical counterpart
  43. GRB110414A: MITSuME Ishigakijima Optical upper limits
  44. GRB 110414A: GROND upper limits
  45. GRB110414A: MITSuME Okayama Optical upper limits
  46. GRB 110414A: Swift/UVOT Upper limits
  47. GRB 110414A: Enhanced Swift-XRT position
  48. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  49. GRB 110414A: Swift detection of a burst
  50. GRB 110411A: PAIRITEL NIR Upper Limits
  51. GRB 110412A: Fermi GBM observation
  52. GRB 110411A: Swift/UVOT Upper Limits
  53. GRB 110411A: MASTER prompt and follow-up optical limits
  54. GRB 110411A, Swift-BAT refined analysis
  55. GRB 110411A: Enhanced Swift-XRT position
  56. GRB 110411A: MASTER optical observations
  57. GRB 110411A: Swift detection of a burst
  58. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  59. GRB 110328A / Swift J164449.3+573451: optical observations
  60. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  61. GRB 110407A: MASTER optical observations
  62. GRB110407A: UVOT Upper Limits
  63. GRB 110407A: GROND Detection of the Optical Afterglow
  64. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  65. GRB 110407A: NOT optical observations
  66. GRB 110407A: Enhanced Swift-XRT position
  67. IPN triangulation of the bright GRB110406A
  68. GRB 110407A: MASTER early optical observations
  69. GRB 110407A: Swift detection of a burst
  70. Konus-Wind observation of GRB 110406A
  71. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  72. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  73. GRB 110402A: fading optical afterglow
  74. GRB 110402A: Suzaku WAM observation of the prompt emission
  75. GRB 110328A / Swift J164449.3+573451, HST Observations
  76. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  77. GRB 110402A: optical observations in Mondy
  78. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  79. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  80. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  81. GRB 110402A: Swift/UVOT detection of afterglow candidate
  82. GRB 110402A: Spectral lag indicates short hard burst
  83. Konus-Wind observation of GRB 110402A
  84. GRB 110402A: Konkoly observations
  85. GRB 110328A: Konkoly observations.
  86. GRB 110402A: Swift-BAT refined analysis
  87. GRB 110402A: early optical limit by "Pi of the Sky"
  88. GRB 110402A: further NOT observations
  89. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  90. GRB 110402A: PAIRITEL NIR Upper Limits
  91. GRB 110402A: Enhanced Swift-XRT position
  92. GRB 110402A: NOT afterglow confirmation
  93. GRB 110402A: Swift detection of a burst
  94. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  95. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  96. GRB 110328/Swift J164449.3+573451: Fermi observations
  97. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  98. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  99. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  100. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart

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