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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"

19721 results found.

  1. GRB 120802A: APEX/LABOCA submm observations
  2. GRB 120802A: Swift-BAT refined analysis
  3. GRB 120802A: Enhanced Swift-XRT position
  4. GRB 120802A: MASTER optical observations
  5. GRB 120802A: optical uper limit in ISON-NM observatory
  6. GRB 120802A: Swift detection of a burst
  7. GRB 120729A: RTT150 optical observations
  8. Virtual Telescope observations of GRB 120729A
  9. T100 observations of GRB 120729A
  10. GRB 120728A: GROND Afterglow discovery
  11. GRB 120729A: Swift/UVOT Detection
  12. GRB 120729A: Enhanced Swift-XRT position
  13. GRB 120728A: Swift/UVOT Upper Limits
  14. GRB 120729A: Swift detection of a burst with an optical afterglow
  15. GRB 120728A: Enhanced Swift-XRT position
  16. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  17. GRB 120728A: GROND observations
  18. GRB 120728A: Swift detection of a burst
  19. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  20. GRB 120716A: optical observation in Maidanak observatory
  21. Swift Trigger 528925 is probably a noise fluctuation
  22. GRB 120722A: optical upper limit
  23. GRB 120724A: optical observation in Maidanak observatory
  24. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  25. GRB 120724A: Enhanced Swift-XRT position
  26. GRB 120724A: Swift-XRT refined Analysis
  27. GRB 120724A: Swift detection of a burst
  28. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  29. GRB 120722A: Swift/UVOT Upper Limits
  30. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  31. GRB 120722A: GROND detection of the afterglow
  32. GRB 120722A: 1.5m OSN I-band observations
  33. GRB 120722A: Enhanced Swift-XRT position
  34. GRB 120722A: Swift detection of a burst
  35. GRB 120716A: Swift-XRT detection
  36. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  37. GRB 120716A: Redshift confirmation from VLT/X-shooter
  38. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  39. GRB 120716A: Optical decay from NOT
  40. GRB 120716A: Candidate Optical Afterglow from PTF
  41. GRB 120714B: Swift/UVOT Detection
  42. GRB120714A: Swift/UVOT upper limits
  43. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  44. GRB 120714A: GROND upper limits
  45. GRB 120714B: GROND confirmation of fading afterglow
  46. GRB 120714B: Redshift from VLT/X-shooter
  47. GRB 120624B: VLA Observations
  48. GRB 120714B: Swift detection of a burst
  49. GRB 120714A: Enhanced Swift-XRT position
  50. GRB 120711A: INTEGRAL/SPI observations
  51. GRB 120714A: Swift-XRT observations
  52. GRB120711B: MITSuME Ishigakijima upper limits
  53. GRB 120712A: Swift/UVOT Detection
  54. GRB 120712A: VLT/Xshooter redshift
  55. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  56. GRB 120712A: Enhanced Swift-XRT position
  57. GRB 120712A: Swift-BAT refined analysis
  58. GRB 120712A: Swift detection of a burst with optical afterglow
  59. GRB 120711B: Swift-XRT refined Analysis
  60. GRB 120711A: Fermi LAT Detection
  61. GRB 120711B: Swift/UVOT Upper Limits
  62. GRB 120711A: Swift/UVOT Observations
  63. GRB 120711A: Fermi LAT detection
  64. GRB 120711A: MASTER early OT detection
  65. GRB 120711A: Swift-XRT observations
  66. GRB 120711A: REM NIR early time detection
  67. GRB 120711A: GROND photometric redshift
  68. Continued Skynet/PROMPT observations of GRB120711A
  69. Swift detection of GRB 120711B or a new Galactic transient
  70. Skynet/PROMPT Observations of GRB120711A
  71. GRB 120709A: Swift-XRT observations
  72. GRB 120709A: optical afterglow limits
  73. IPN Triangulation of GRB 120707A
  74. GRB 120709A: Fermi-LAT Detection
  75. GRB 120703A: Swift/UVOT Detection
  76. GRB 120703A: Enhanced Swift-XRT position
  77. GRB 120703A: NOT optical observation
  78. GRB 120701A: Swift/UVOT Detection
  79. GRB 120701A: GROND detection of the afterglow
  80. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  81. GRB 120701A: Swift-XRT afterglow detection and analysis
  82. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  83. Swift Trigger 525554 is probably not a GRB
  84. GRB120624B: Chandra observations and afterglow detection
  85. GRB 120624B: Swift/UVOT Upper Limits
  86. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  87. GRB 120624B: Swift-XRT observations
  88. GRB 120624B: GROND upper limits
  89. GRB 120624B: NIR counterpart candidate from HAWKI
  90. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  91. Swift detection of Ginga 0834-430
  92. GRB 120624B: NOT optical upper limit
  93. Swift detection of IGR J17062-6143
  94. GRB 120624B: optical observations
  95. GRB 120624B, Swift-BAT refined analysis
  96. GRB 120624B: Fermi-LAT Detection
  97. IPN Triangulation of GRB 120624A (short/intense)
  98. Swift Trigger 524949: Noise fluctuation near a galaxy
  99. Swift trigger 524642 / SwJ1910.2-0546
  100. Swift triggers (#524542) on a Galactic source

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