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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"

20510 results found.

  1. GRB 120803B: Swift detection of a burst
  2. GRB 120803A: Swift detection of a possible burst
  3. GRB 120802A: GRT Optical Observation
  4. GRB 120802A: APEX/LABOCA submm observations
  5. GRB 120802A: Enhanced Swift-XRT position
  6. GRB 120802A: MASTER optical observations
  7. GRB 120802A: optical uper limit in ISON-NM observatory
  8. GRB 120802A: Swift detection of a burst
  9. GRB 120728B: Fermi GBM detection
  10. Konus-Wind observation of GRB 120728B
  11. GRB 120729A: RTT150 optical observations
  12. Virtual Telescope observations of GRB 120729A
  13. T100 observations of GRB 120729A
  14. GRB 120728A: GROND Afterglow discovery
  15. GRB 120729A: Swift/UVOT Detection
  16. GRB 120729A: Enhanced Swift-XRT position
  17. GRB 120728A: Swift/UVOT Upper Limits
  18. GRB 120729A: Swift detection of a burst with an optical afterglow
  19. GRB 120728A: Enhanced Swift-XRT position
  20. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  21. GRB 120728A: GROND observations
  22. GRB 120728A: Swift detection of a burst
  23. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  24. GRB 120716A: optical observation in Maidanak observatory
  25. Swift Trigger 528925 is probably a noise fluctuation
  26. GRB 120722A: optical upper limit
  27. GRB 120724A: optical observation in Maidanak observatory
  28. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  29. GRB 120724A: Enhanced Swift-XRT position
  30. GRB 120724A: Swift-XRT refined Analysis
  31. GRB 120724A: Swift detection of a burst
  32. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  33. GRB 120722A: Swift/UVOT Upper Limits
  34. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  35. GRB 120722A: GROND detection of the afterglow
  36. GRB 120722A: 1.5m OSN I-band observations
  37. GRB 120722A: Enhanced Swift-XRT position
  38. GRB 120722A: Swift detection of a burst
  39. GRB 120716A: Swift-XRT detection
  40. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  41. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  42. GRB 120716A: Optical decay from NOT
  43. GRB 120716A: Candidate Optical Afterglow from PTF
  44. GRB 120714B: Swift/UVOT Detection
  45. GRB120714A: Swift/UVOT upper limits
  46. GRB 120714A: GROND upper limits
  47. GRB 120714B: GROND confirmation of fading afterglow
  48. GRB 120714B: Redshift from VLT/X-shooter
  49. GRB 120624B: VLA Observations
  50. GRB 120714A: Swift-BAT refined analysis
  51. GRB 120714B: Swift detection of a burst
  52. GRB 120714A: Enhanced Swift-XRT position
  53. GRB 120711A: INTEGRAL/SPI observations
  54. GRB 120714A: Swift-XRT observations
  55. GRB120711B: MITSuME Ishigakijima upper limits
  56. GRB 120712A: Swift/UVOT Detection
  57. GRB 120712A: VLT/Xshooter redshift
  58. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  59. GRB 120712A: Enhanced Swift-XRT position
  60. GRB 120712A: Swift detection of a burst with optical afterglow
  61. GRB 120711B: Swift-XRT refined Analysis
  62. GRB 120711A: Fermi LAT Detection
  63. GRB 120711B: Swift/UVOT Upper Limits
  64. GRB 120711A: Swift/UVOT Observations
  65. Konus-Wind observation of GRB 120711A
  66. GRB 120711A: Fermi LAT detection
  67. GRB 120711A: MASTER early OT detection
  68. GRB 120711A: Swift-XRT observations
  69. GRB 120711A: REM NIR early time detection
  70. GRB 120711A: GROND photometric redshift
  71. Continued Skynet/PROMPT observations of GRB120711A
  72. Swift detection of GRB 120711B or a new Galactic transient
  73. Skynet/PROMPT Observations of GRB120711A
  74. GRB 120709A: Swift-XRT observations
  75. GRB 120709A: optical afterglow limits
  76. Konus-Wind observation of GRB 120707A
  77. IPN Triangulation of GRB 120707A
  78. GRB 120709A: Fermi-LAT Detection
  79. GRB 120707A: Fermi GBM Detection of a Bright Burst
  80. GRB 120703A: Swift/UVOT Detection
  81. GRB 120703A: Enhanced Swift-XRT position
  82. GRB 120624B Suzaku WAM observation of the prompt emission
  83. GRB 120703A: NOT optical observation
  84. GRB 120701A: Swift/UVOT Detection
  85. GRB 120701A: GROND detection of the afterglow
  86. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  87. Swift Trigger 525554 is noise
  88. GRB 120701A: Swift-XRT afterglow detection and analysis
  89. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  90. Swift Trigger 525554 is probably not a GRB
  91. GRB120624B: Chandra observations and afterglow detection
  92. GRB 120624B: Swift/UVOT Upper Limits
  93. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  94. GRB 120624B: Swift-XRT observations
  95. GRB 120624B: GROND upper limits
  96. XRF 120626B: MAXI/GSC detection
  97. GRB 120624B: NIR counterpart candidate from HAWKI
  98. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  99. Swift detection of Ginga 0834-430
  100. GRB 120624B: NOT optical upper limit

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