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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"

26719 results found.

  1. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  2. GRB 120722A: Swift/UVOT Upper Limits
  3. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  4. GRB 120722A: GROND detection of the afterglow
  5. GRB 120722A: 1.5m OSN I-band observations
  6. GRB 120722A: Swift-XRT refined Analysis
  7. GRB 120722A: Enhanced Swift-XRT position
  8. GRB 120722A: Swift detection of a burst
  9. GRB 120716A: Fermi GBM observation
  10. GRB 120716A: Swift-XRT detection
  11. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  12. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  13. GRB 120716A: Optical decay from NOT
  14. GRB 120716A: Candidate Optical Afterglow from PTF
  15. GRB 120714B: Swift/UVOT Detection
  16. GRB 120714B: Swift-XRT refined Analysis
  17. GRB120714A: Swift/UVOT upper limits
  18. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  19. GRB 120714A: GROND upper limits
  20. GRB 120714B: GROND confirmation of fading afterglow
  21. GRB 120714B: Redshift from VLT/X-shooter
  22. GRB 120714A: Swift-XRT refined Analysis
  23. GRB 120624B: VLA Observations
  24. GRB 120714B: Swift detection of a burst
  25. GRB 120714A: Enhanced Swift-XRT position
  26. GRB 120712A: Fermi GBM observation
  27. GRB 120711A: INTEGRAL/SPI observations
  28. GRB 120714A: Swift-XRT observations
  29. GRB120711B: MITSuME Ishigakijima upper limits
  30. GRB 120712A: Swift/UVOT Detection
  31. GRB 120712A: VLT/Xshooter redshift
  32. GRB 120712A: Swift-XRT refined Analysis
  33. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  34. GRB 120712A: Enhanced Swift-XRT position
  35. GRB 120712A: Swift detection of a burst with optical afterglow
  36. GRB 120711B: Swift-XRT refined Analysis
  37. GRB 120711A: Fermi LAT Detection
  38. GRB 120711B: Swift/UVOT Upper Limits
  39. GRB 120711A: Swift/UVOT Observations
  40. GRB 120711A: Fermi LAT detection
  41. GRB 120711A: MASTER early OT detection
  42. GRB 120711A: Swift-XRT observations
  43. GRB 120711A: REM NIR early time detection
  44. GRB 120711A: GROND photometric redshift
  45. GRB 120711A: Fermi GBM observation
  46. GRB 120711A: MAXI/GSC detection
  47. Continued Skynet/PROMPT observations of GRB120711A
  48. Swift detection of GRB 120711B or a new Galactic transient
  49. Skynet/PROMPT Observations of GRB120711A
  50. GRB 120709A: Fermi GBM detection
  51. GRB 120709A: Swift-XRT observations
  52. GRB 120709A: optical afterglow limits
  53. IPN Triangulation of GRB 120707A
  54. GRB 120709A: Fermi-LAT Detection
  55. GRB 120707A: Fermi GBM Detection of a Bright Burst
  56. GRB 120624B: mm detection at PdBI
  57. GRB 120703A: Swift/UVOT Detection
  58. GRB 120703A: Fermi GBM detection
  59. GRB 120703A: Swift-XRT refined Analysis
  60. GRB 120703A: Enhanced Swift-XRT position
  61. GRB 120624B Suzaku WAM observation of the prompt emission
  62. GRB 120703A: NOT optical observation
  63. GRB 120701A: Swift/UVOT Detection
  64. GRB 120701A: GROND detection of the afterglow
  65. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  66. GRB 120701A: Swift-XRT afterglow detection and analysis
  67. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  68. GRB 120701A: Swift-BAT refined analysis
  69. Swift Trigger 525554 is probably not a GRB
  70. GRB120624B: Chandra observations and afterglow detection
  71. GRB 120624B: Swift/UVOT Upper Limits
  72. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  73. GRB 120624B: Further analysis of the HAWKI observations
  74. GRB 120624B: Swift-XRT observations
  75. GRB 120624B: GROND upper limits
  76. XRF 120626B: MAXI/GSC detection
  77. GRB 120624B: NIR counterpart candidate from HAWKI
  78. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  79. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  80. Swift detection of Ginga 0834-430
  81. GRB 120624B: NOT optical upper limit
  82. Swift detection of IGR J17062-6143
  83. GRB 120624B: optical observations
  84. GRB 120624B, Swift-BAT refined analysis
  85. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  86. GRB 120624A: Fermi GBM observation
  87. GRB 120624B: Fermi-LAT Detection
  88. GRB 120624B: Fermi GBM detection
  89. IPN Triangulation of GRB 120624A (short/intense)
  90. Swift Trigger 524949: Noise fluctuation near a galaxy
  91. GRB 120622A: MAXI/GSC detection
  92. Swift trigger 524642 / SwJ1910.2-0546
  93. GRB 120602A: Suzaku WAM observation of the prompt emission
  94. Swift triggers (#524542) on a Galactic source
  95. IPN Triangulation of GRB 120602A (long/very bright)
  96. GRB 120612A: optical observations
  97. GRB 120612A: Swift/UVOT observations
  98. GRB 120612A: Swift-XRT refined Analysis
  99. GRB 120612A: Enhanced Swift-XRT position
  100. GRB 120612A: BOOTES-3 optical upper limit

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