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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20963 results found.

  1. GRB 120729A Gemini-N redshift
  2. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  3. GRB 120728A: GROND observations
  4. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  5. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  6. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  7. GRB 120724A: Gemini-N tentative redshift
  8. GRB 120722A: Swift/UVOT Upper Limits
  9. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  10. GRB 120722A: GROND detection of the afterglow
  11. GRB 120722A: 1.5m OSN I-band observations
  12. GRB 120722A: Xinglong TNT optical afterglow candidate
  13. GRB 120716A: EVLA Detection
  14. GRB 120716A: Swift-XRT detection
  15. GRB 120716A: Redshift confirmation from VLT/X-shooter
  16. VLT/FORS2 redshift of GRB120716A
  17. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  18. GRB 120716A: Optical decay from NOT
  19. GRB 120716A: Candidate Optical Afterglow from PTF
  20. GRB 120711A: ATCA 34GHz final observations (upper limit)
  21. GRB 120714B: Swift/UVOT Detection
  22. GRB120714A: Swift/UVOT upper limits
  23. GRB 120714A: GROND upper limits
  24. GRB 120714B: GROND confirmation of fading afterglow
  25. GRB 120714B: Redshift from VLT/X-shooter
  26. GRB 120624B: VLA Observations
  27. GRB 120711A: INTEGRAL/SPI observations
  28. GRB 120714A: Swift-XRT observations
  29. GRB 120711A: ATCA 34GHz further observations (upper limit)
  30. GRB 120712A: Swift/UVOT Detection
  31. GRB 120712A: VLT/Xshooter redshift
  32. GRB 120712A Gemini-S redshift
  33. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  34. GRB 120711A: ATCA 34GHz upper limit
  35. GRB 120711B: Swift/UVOT Upper Limits
  36. GRB 120711A: Swift/UVOT Observations
  37. GRB 120709A: Swift/UVOT Observations
  38. GRB 120711A: Swift-XRT observations
  39. GRB 120711A Gemini-S likely redshift
  40. GRB 120711A: GROND photometric redshift
  41. GRB 120711A: a possible X-ray transient
  42. Continued Skynet/PROMPT observations of GRB120711A
  43. GRB 120711A: ROTSE-III confirm of Optical Counterpart
  44. Skynet/PROMPT Observations of GRB120711A
  45. GRB 120709A: Swift-XRT observations
  46. GRB 120709A: optical afterglow limits
  47. GRB 120624B: mm detection at PdBI
  48. GRB 120703A: SMARTS optical/IR observations
  49. GRB 120703A: Swift/UVOT Detection
  50. GRB 120703A: NOT optical observation
  51. GRB 120701A: Swift/UVOT Detection
  52. GRB 120701A: GROND detection of the afterglow
  53. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  54. GRB 120630A: NOT optical source within the XRT error circle
  55. GRB120624B: Chandra observations and afterglow detection
  56. GRB 120624B Further Swift-XRT analysis
  57. GRB 120624B: Swift/UVOT Upper Limits
  58. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  59. GRB 120624B: Further analysis of the HAWKI observations
  60. GRB 120624B: Swift-XRT observations
  61. GRB 120624B: GROND upper limits
  62. GRB 120624B: NIR counterpart candidate from HAWKI
  63. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  64. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  65. GRB 120624B: NOT optical upper limit
  66. GRB 120624B: optical observations
  67. Swift Trigger 524949: Noise fluctuation near a galaxy
  68. GRB 120622A: MAXI/GSC detection
  69. GRB 120614A: MAXI/GSC detection of a burst
  70. GRB 120612A: optical observations
  71. GRB 120612A: Swift/UVOT observations
  72. GRB 120528C: MAXI/GSC detection
  73. GRB 120521C redshift estimate
  74. GRB 120528B: MAXI/GSC detection
  75. GRB 120521C: EVLA 22 GHz Detection
  76. GRB120521B: SSO 2.3m upper limits
  77. GRB 120521A: ATCA 34GHz upper limit
  78. GRB 120521C: Early Tautenburg limits
  79. GRB 120521A: GROND Upper limits
  80. GRB 120521C: Keck Observations
  81. GRB 120521C: Swift/UVOT Upper Limits
  82. GRB 120521B: Swift/UVOT Upper Limits
  83. GRB 120521B: GROND Upper limits
  84. GRB 120521C: PAIRITEL NIR Upper Limits
  85. GRB 120521C: BOOTES-1 optical observations
  86. GRB 120521C: WHT optical observations
  87. GRB120521C: Liverpool Telescope observations
  88. GRB 120521C: TAROT Calern observatory optical observations
  89. Swift starts a new program to find fainter transients
  90. GRB 120521A: Swift/UVOT Upper Limits
  91. Correction to GCN 13307 (GRB120521B)
  92. GRB120521B: Faulkes Telescope South observations
  93. GRB 120521B: TAROT La Silla observatory optical observations
  94. GRB 120521A: TAROT La Silla observatory optical observations
  95. GRB 120514A: Swift/UVOT Upper Limits
  96. GRB 120514A: UKIRT IR observations
  97. GRB 120514A: APEX observations of the submm counterpart
  98. GRB 120514A: TAROT Calern observatory optical observations
  99. GRB 120514A: Swift detection of a burst
  100. GRB 120422A: Konkoly optical observations

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