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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"

28302 results found.

  1. GRB 120807A: Enhanced Swift-XRT position
  2. GRB 120807A: Swift detection of a burst
  3. Fermi/GBM detection of an SGR-like burst
  4. GRB 120805A: Swift/UVOT Upper Limits
  5. Swift trigger 530214: uncertain if real or not
  6. GRB 120728A: Fermi GBM observation
  7. GRB 120805A: Swift-BAT refined analysis
  8. GRB 120802A: Swift/UVOT Upper Limits
  9. GRB 120805A: Swift-XRT refined Analysis
  10. GRB 120805A: TAROT Calern observatory optical observations
  11. GRB 120805A: Swift detection of a burst
  12. GRB 120804A: MITSuME Okayama Optical upper limits
  13. GRB 120803B: Swift-XRT refined Analysis
  14. GRB 120804A: Swift/UVOT Upper Limits
  15. GRB 120804A: Swift-BAT refined analysis
  16. GRB 120804A: Swift-XRT refined Analysis
  17. GRB 120804A: GROND upper limits
  18. GRB 120804A: Enhanced Swift-XRT position
  19. GRB 120803B: MITSuME Okayama Optical upper limits
  20. GRB 120803A: MITSuME Okayama Optical upper limits
  21. GRB 120804A: Swift detection of a short burst
  22. GRB 120803B: Swift-BAT refined analysis
  23. GRB 120803B: Enhanced Swift-XRT position
  24. GRB 120803A: Swift-BAT refined analysis
  25. GRB 120803B: FTN possible afterglow candidate
  26. GRB 120803B: Swift detection of a burst
  27. GRB 120803A: Swift detection of a possible burst
  28. GRB 120802A: GRT Optical Observation
  29. GRB 120802A: Swift-XRT refined Analysis
  30. GRB 120802A: APEX/LABOCA submm observations
  31. GRB 120729A: Fermi GBM observation
  32. GRB 120802A: Swift-BAT refined analysis
  33. GRB 120802A: Enhanced Swift-XRT position
  34. GRB 120802A: MASTER optical observations
  35. GRB 120802A: optical uper limit in ISON-NM observatory
  36. GRB 120802A: Swift detection of a burst
  37. GRB 120728B: Fermi GBM detection
  38. GRB 120729A: RTT150 optical observations
  39. Virtual Telescope observations of GRB 120729A
  40. T100 observations of GRB 120729A
  41. GRB 120728A: GROND Afterglow discovery
  42. GRB 120729A: Swift-XRT refined Analysis
  43. GRB 120729A: Swift/UVOT Detection
  44. GRB 120729A, Swift-BAT refined analysis
  45. GRB 120728A, Swift-BAT refined analysis
  46. GRB 120729A: Enhanced Swift-XRT position
  47. GRB 120728A: Swift/UVOT Upper Limits
  48. GRB 120729A: Swift detection of a burst with an optical afterglow
  49. GRB 120728A: Swift-XRT refined Analysis
  50. GRB 120728A: Enhanced Swift-XRT position
  51. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  52. GRB 120728A: GROND observations
  53. GRB 120728A: Swift detection of a burst
  54. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  55. Swift Trigger 528925 is probably a noise fluctuation
  56. GRB 120722A: optical upper limit
  57. GRB 120724A: optical observation in Maidanak observatory
  58. GRB 120724A, Swift-BAT refined analysis
  59. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  60. GRB 120724A: Enhanced Swift-XRT position
  61. GRB 120724A: Swift-XRT refined Analysis
  62. GRB 120724A: FTN optical afterglow candidate
  63. GRB 120724A: Swift detection of a burst
  64. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  65. GRB 120722A: Swift/UVOT Upper Limits
  66. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  67. GRB 120722A: GROND detection of the afterglow
  68. GRB 120722A: 1.5m OSN I-band observations
  69. GRB 120722A: Swift-XRT refined Analysis
  70. GRB 120722A: Swift-BAT refined analysis
  71. GRB 120722A: Enhanced Swift-XRT position
  72. GRB 120722A: Swift detection of a burst
  73. GRB 120716A: Fermi GBM observation
  74. GRB 120716A: Swift-XRT detection
  75. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  76. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  77. GRB 120716A: Optical decay from NOT
  78. GRB 120716A: Candidate Optical Afterglow from PTF
  79. GRB 120714B: Swift/UVOT Detection
  80. GRB 120714B: Swift-XRT refined Analysis
  81. GRB120714A: Swift/UVOT upper limits
  82. GRB 120714B: Swift-BAT refined analysis
  83. GRB 120714A: GROND upper limits
  84. GRB 120714B: GROND confirmation of fading afterglow
  85. GRB 120714B: Redshift from VLT/X-shooter
  86. GRB 120714A: Swift-XRT refined Analysis
  87. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  88. GRB 120624B: VLA Observations
  89. GRB 120714A: Swift-BAT refined analysis
  90. GRB 120714B: Swift detection of a burst
  91. GRB 120714A: Enhanced Swift-XRT position
  92. GRB 120712A: Fermi GBM observation
  93. GRB 120711A: INTEGRAL/SPI observations
  94. GRB 120714A: Swift-XRT observations
  95. GRB120711B: MITSuME Ishigakijima upper limits
  96. GRB 120714A: Swift detection of a burst
  97. GRB 120712A: Swift/UVOT Detection
  98. GRB 120712A: VLT/Xshooter redshift
  99. GRB 120712A: Swift-XRT refined Analysis
  100. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z

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