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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"

28244 results found.

  1. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  2. GRB 120724A: Enhanced Swift-XRT position
  3. GRB 120724A: Swift-XRT refined Analysis
  4. GRB 120724A: FTN optical afterglow candidate
  5. GRB 120724A: Swift detection of a burst
  6. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  7. GRB 120722A: Swift/UVOT Upper Limits
  8. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  9. GRB 120722A: GROND detection of the afterglow
  10. GRB 120722A: 1.5m OSN I-band observations
  11. GRB 120722A: Swift-XRT refined Analysis
  12. GRB 120722A: Swift-BAT refined analysis
  13. GRB 120722A: Enhanced Swift-XRT position
  14. GRB 120722A: Swift detection of a burst
  15. GRB 120716A: Fermi GBM observation
  16. GRB 120716A: Swift-XRT detection
  17. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  18. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  19. GRB 120716A: Optical decay from NOT
  20. GRB 120716A: Candidate Optical Afterglow from PTF
  21. GRB 120714B: Swift/UVOT Detection
  22. GRB 120714B: Swift-XRT refined Analysis
  23. GRB120714A: Swift/UVOT upper limits
  24. GRB 120714B: Swift-BAT refined analysis
  25. GRB 120714A: GROND upper limits
  26. GRB 120714B: GROND confirmation of fading afterglow
  27. GRB 120714B: Redshift from VLT/X-shooter
  28. GRB 120714A: Swift-XRT refined Analysis
  29. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  30. GRB 120624B: VLA Observations
  31. GRB 120714A: Swift-BAT refined analysis
  32. GRB 120714B: Swift detection of a burst
  33. GRB 120714A: Enhanced Swift-XRT position
  34. GRB 120712A: Fermi GBM observation
  35. GRB 120711A: INTEGRAL/SPI observations
  36. GRB 120714A: Swift-XRT observations
  37. GRB120711B: MITSuME Ishigakijima upper limits
  38. GRB 120714A: Swift detection of a burst
  39. GRB 120712A: Swift/UVOT Detection
  40. GRB 120712A: VLT/Xshooter redshift
  41. GRB 120712A: Swift-XRT refined Analysis
  42. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  43. GRB 120712A: Enhanced Swift-XRT position
  44. GRB 120712A: Swift-BAT refined analysis
  45. GRB 120712A: Swift detection of a burst with optical afterglow
  46. GRB 120711B: Swift-XRT refined Analysis
  47. GRB 120711A: Fermi LAT Detection
  48. GRB 120711B: Swift-BAT refined analysis
  49. GRB 120711B: Swift/UVOT Upper Limits
  50. GRB 120711A: Swift/UVOT Observations
  51. GRB 120711A: Fermi LAT detection
  52. GRB 120711A: MASTER early OT detection
  53. GRB 120711A: Swift-XRT observations
  54. GRB 120711A: REM NIR early time detection
  55. GRB 120711A: GROND photometric redshift
  56. GRB 120711A: Fermi GBM observation
  57. GRB 120711A: an bright long GRB detected with INTEGRAL
  58. Continued Skynet/PROMPT observations of GRB120711A
  59. Swift detection of GRB 120711B or a new Galactic transient
  60. Skynet/PROMPT Observations of GRB120711A
  61. GRB 120709A: Fermi GBM detection
  62. GRB 120709A: Swift-XRT observations
  63. GRB 120709A: optical afterglow limits
  64. IPN Triangulation of GRB 120707A
  65. GRB 120709A: Fermi-LAT Detection
  66. GRB 120707A: Fermi GBM Detection of a Bright Burst
  67. GRB 120624B: mm detection at PdBI
  68. GRB 120703A: Swift/UVOT Detection
  69. GRB 120703A: Swift-XRT refined Analysis
  70. GRB 120703A: Enhanced Swift-XRT position
  71. GRB 120703A: Swift-BAT refined analysis
  72. GRB 120624B Suzaku WAM observation of the prompt emission
  73. GRB 120703A: NOT optical observation
  74. GRB 120701A: Swift/UVOT Detection
  75. GRB 120701A: GROND detection of the afterglow
  76. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  77. GRB 120701A: Swift-XRT afterglow detection and analysis
  78. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  79. GRB 120701A: Swift-BAT refined analysis
  80. Swift Trigger 525554 is probably not a GRB
  81. GRB120624B: Chandra observations and afterglow detection
  82. GRB 120624B: Swift/UVOT Upper Limits
  83. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  84. GRB 120624B: Swift-XRT observations
  85. GRB 120624B: GROND upper limits
  86. GRB 120624B: NIR counterpart candidate from HAWKI
  87. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  88. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  89. Swift detection of Ginga 0834-430
  90. GRB 120624B: NOT optical upper limit
  91. Swift detection of IGR J17062-6143
  92. GRB 120624B: optical observations
  93. GRB 120624B, Swift-BAT refined analysis
  94. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  95. GRB 120624B: Fermi-LAT Detection
  96. GRB 120624B: Fermi GBM 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. GRB 120602A: Suzaku WAM observation of the prompt emission

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