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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"

37708 results found.

  1. Virtual Telescope observations of GRB 120729A
  2. GRB 120729A: Early RAPTOR Observations
  3. GRB 120729A: UKIRT Observation
  4. T100 observations of GRB 120729A
  5. GRB 120728A: GROND Afterglow discovery
  6. GRB 120729A: Swift-XRT refined Analysis
  7. GRB 120729A: Swift/UVOT Detection
  8. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  9. GRB 120729A: Xinglong TNT optical upper limit
  10. GRB 120729A, Swift-BAT refined analysis
  11. GRB 120728A, Swift-BAT refined analysis
  12. GRB 120729A: Enhanced Swift-XRT position
  13. GRB 120728A: Swift/UVOT Upper Limits
  14. GRB 120729A Gemini-N redshift
  15. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  16. GRB 120729A: Swift detection of a burst with an optical afterglow
  17. GRB 120728A: Swift-XRT refined Analysis
  18. GRB 120728A: Enhanced Swift-XRT position
  19. GRB 120728A: GROND observations
  20. GRB 120728A: Swift detection of a burst
  21. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  22. GRB 120716A: optical observation in Maidanak observatory
  23. GRB 120722A: optical upper limit
  24. GRB 120724A: optical observation in Maidanak observatory
  25. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  26. GRB 120716A: optical observation in CrAO
  27. GRB 120724A, Swift-BAT refined analysis
  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: Gemini-N tentative redshift
  32. GRB 120724A: FTN optical afterglow candidate
  33. GRB 120724A: Swift detection of a burst
  34. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  35. GRB 120722A: Swift/UVOT Upper Limits
  36. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  37. GRB 120722A: GROND detection of the afterglow
  38. GRB 120722A: 1.5m OSN I-band observations
  39. GRB 120722A: Swift-XRT refined Analysis
  40. GRB 120722A: Swift-BAT refined analysis
  41. GRB 120722A: Enhanced Swift-XRT position
  42. GRB 120722A: Correction for GCN circ.13500
  43. GRB 120722A: Xinglong TNT optical afterglow candidate
  44. GRB 120722A: Swift detection of a burst
  45. GRB 120716A: Fermi GBM observation
  46. GRB 120716A: EVLA Detection
  47. GRB 120716A: Swift-XRT detection
  48. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  49. GRB 120716A: Redshift confirmation from VLT/X-shooter
  50. VLT/FORS2 redshift of GRB120716A
  51. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  52. GRB 120716A: Typo correction in GCN 13490
  53. GRB 120716A: Optical decay from NOT
  54. GRB 120716A: Candidate Optical Afterglow from PTF
  55. Konus-Wind observation of GRB 120716A
  56. IPN Triangulation of unusual GRB 120716A
  57. Fermi GBM trigger 120716.498 is not a GRB
  58. GRB 120711A: ATCA 34GHz final observations (upper limit)
  59. GRB 120714B: Swift/UVOT Detection
  60. GRB 120714B: Swift-XRT refined Analysis
  61. GRB120714A: Swift/UVOT upper limits
  62. GRB 120714B: Swift-BAT refined analysis
  63. GRB 120714A: GROND upper limits
  64. GRB 120714B: GROND confirmation of fading afterglow
  65. GRB 120714B: Redshift from VLT/X-shooter
  66. GRB 120714A: Swift-XRT refined Analysis
  67. GRB 120624B: VLA Observations
  68. GRB 120714B: Position Correction and Candidate Optical Afterglow
  69. GRB 120714A: Swift-BAT refined analysis
  70. GRB 120714B: Swift detection of a burst
  71. GRB 120714A: Enhanced Swift-XRT position
  72. GRB 120712A: Fermi GBM observation
  73. GRB 120711A: INTEGRAL/SPI observations
  74. GRB 120714A: Swift-XRT observations
  75. GRB120711B: MITSuME Ishigakijima upper limits
  76. GRB 120714A: Swift detection of a burst
  77. GRB 120711A: ATCA 34GHz further observations (upper limit)
  78. IPN Triangulation of GRB 120709A
  79. GRB 120712A: Swift/UVOT Detection
  80. GRB 120712A: VLT/Xshooter redshift
  81. GRB 120712A: Swift-XRT refined Analysis
  82. GRB 120712A Gemini-S redshift
  83. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  84. GRB 120712A: Enhanced Swift-XRT position
  85. GRB 120712A: Swift-BAT refined analysis
  86. GRB 120712A: Swift detection of a burst with optical afterglow
  87. GRB 120711B: Swift-XRT refined Analysis
  88. GRB 120711A: Fermi LAT Detection
  89. GRB 120711A: ATCA 34GHz upper limit
  90. GRB 120711B: Swift-BAT refined analysis
  91. GRB 120711B: Swift/UVOT Upper Limits
  92. GRB 120711A: Swift/UVOT Observations
  93. GRB 120709A: Swift/UVOT Observations
  94. Konus-Wind observation of GRB 120711A
  95. GRB 120711A: Fermi LAT detection
  96. GRB 120711A: MASTER early OT detection
  97. GRB 120711A: Swift-XRT observations
  98. GRB 120711A Gemini-S likely redshift
  99. Konus-Wind observation of GRB 120709A
  100. GRB 120711A: REM NIR early time detection

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