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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"

16141 results found.

  1. GRB140629A: VATT optical observations
  2. GRB 140629A: P60 observations
  3. GRB 140629A: BTA redshift
  4. GRB 140629A: MITSuME Ishigakijima Optical Observation
  5. GRB140629A: Kanata/HOWPol optical observation
  6. GRB 140629A: NOT optical observations
  7. GRB 140629A : Virtual Telescope optical observations
  8. GRB 140629A: RTT150 optical observations
  9. GRB 140629A : Xinglong TNT optical observation
  10. GRB 140629A: MASTER OT detection
  11. GRB 140629A: Swift detection of a burst with an optical counterpart
  12. GRB 140628A: Zadko observatory - Gingin optical observations
  13. GRB 140626A: TAROT La Silla observatory optical observations
  14. GRB 140622A: TAROT La Silla observatory optical observations
  15. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  16. GRB 140626A: Swift/UVOT Upper Limits
  17. GRB140606B/iPTF14bfu: Keck detection of an associated supernova
  18. GRB 140620A / iPTF14cva: TShAO optical observations
  19. GRB 140623A: Swift-XRT and UVOT observations
  20. GRB 140622A: iTelescope.Net T11 Optical Observation
  21. GRB 140622A: Swift/UVOT Upper Limits
  22. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  23. GRB 140622A: KAIT Optical Upper Limit
  24. GRB 140620A / iPTF14cva: Konkoly optical observations
  25. GRB 140622A: RATIR Optical and NIR Observations
  26. GRB 140620A: Swift/UVOT Detection
  27. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  28. Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
  29. GRB 140610A: TShAO optical upper limit
  30. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  31. GRB 140606A: BTA and OSN optical observations
  32. GRB 140614C: 1.23m CAHA (+EDIPO) observations
  33. GRB 140614B: MITSuME Akeno upper limits
  34. GRB 140614B: MITSuME Okayama upper limits
  35. GRB 140606B / iPTF 14bfu: Mondy optical observations
  36. GRB 140614A: X-shooter redshift
  37. GRB 140614B: Swift/UVOT Upper Limits
  38. GRB 140614B: RATIR Optical and NIR Observations
  39. GRB 140606B / iPTF 14bfu: AAO optical observations
  40. GRB 140614A: Swift/UVOT Upper Limits
  41. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  42. GRB 140610A: RATIR Optical and NIR Observations
  43. GRB 140610A: MASTER optical observations
  44. GRB 140610A: Swift/UVOT Upper Limits
  45. GRB140606B: DCT time of observation correction
  46. GRB 140606B: Swift XRT refined analysis
  47. GRB 140521A: AAO optical upper limit
  48. GRB 140606A: AAO optical upper limit
  49. IPN Triangulation of GRB 140606B
  50. GRB 140606B: Swift/UVOT Upper Limits
  51. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  52. GRB 140606B / Fermi 432717114 / iPTF 14bfu: Keck redshift
  53. GRB 140606B: Fermi GBM detection
  54. GRB 140606A: BOOTES-2 optical upper limit
  55. Fermi423717114: iPTF optical transient candidates
  56. GRB 140606A: Nanshan optical upper limit
  57. GRB 140606A: Swift/UVOT Upper Limits
  58. GRB 140529A: Swift/UVOT Upper Limits
  59. Chandra late-time observations of GRB140515A
  60. Swift Trigger 600114: Optical spectroscopy from GTC
  61. GRB 140523A: NOT observation
  62. GRB 140523A: Nanshan optical upper limit
  63. GRB 140521A : Xinglong TNT upper limit
  64. GRB 140423A: TShAO optical observations
  65. GRB 140521A: AAO optical observations
  66. GRB 140521A: AROMA-N Optical Observation
  67. GRB 140521A: MITSuME Okayama upper limits
  68. GRB 140521A: MASTER optical observations
  69. GRB 140518A: T100 observations
  70. GRB 140518A: Continued RATIR Optical and NIR Observations
  71. GRB 140512A: MASTER prompt and afterglow optical observations
  72. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  73. GRB 140518A: Swift/UVOT Upper Limits
  74. GRB 140518A: RATIR Optical and NIR Observations
  75. GRB 140518A: Gemini-N redshift
  76. GRB 140518A: KAIT optical candidate
  77. GRB 140516A: RATIR Optical and NIR Observations
  78. GRB 140516A: Gemini-North limit on an optical afterglow
  79. GRB 140516A: Swift/UVOT Upper Limits
  80. GRB 140516A: NOT optical observations
  81. GRB 140516A: MASTER early optical observations
  82. GRB 140516A: ISON-Kislovodsk optical observations
  83. GRB 140516A: TNG optical observations
  84. GRB 140515A: VLA Detection
  85. GRB 140419A: Continued Mondy optical observations
  86. GRB 140515A: Optical observations from the 2.5 m NOT
  87. GRB 140515A: KAIT Optical Upper Limit
  88. GRB 140515A: Gemini-North imaging
  89. GRB 140515A: Swift/UVOT Upper Limits
  90. GRB 140423A: HCT optical observations
  91. GRB 140515A: MITSuME Akeno upper limits
  92. GRB 140423A: AAO optical upper limits
  93. GRB 140512A: Xinglong TNT optical observation
  94. GRB 140508A: Mondy upper limit
  95. GRB 140508A: MITSuME Akeno Optical observation
  96. GRB140512A : GROND observations
  97. GRB 140512A: Optical observations from the 2.5 m NOT
  98. GRB 140512A: Mondy optical detection
  99. GRB 140512A: Swift detection of a burst with an optical counterpart
  100. GRB 140512A: MASTER optical observations

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