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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"

16145 results found.

  1. GRB 140512A: Optical observations from the 2.5 m NOT
  2. GRB 140512A: Mondy optical detection
  3. GRB 140512A: Swift detection of a burst with an optical counterpart
  4. GRB 140512A: MASTER optical observations
  5. GRB 140423A: Mondy optical observations
  6. GRB 140508A: Continued RATIR Optical and NIR Observations
  7. GRB 140508A: ​HCT spectroscopy
  8. GRB 140508A: Swift/UVOT Detection
  9. GRB 140508A: RATIR Optical and NIR Observations
  10. GRB 140508A: Optical Observations via Virtual Telescope
  11. GRB 140508A: Swift-XRT observations
  12. GRB 140509A: Swift detection of a burst with an optical counterpart
  13. GRB 140508A: NOT photometry and spectroscopy
  14. GRB 140508A: SAO RAS and MASTER photometric and spectroscopic observations
  15. GRB 140508A: 1.23m CAHA BVRI-band observations
  16. GRB 140508A: iPTF optical transient candidate
  17. GRB 140430A: MITSuME Akeno upper limits
  18. GRB 140502A: ISON-NM early optical limit
  19. GRB 140506A: VLT/X-shooter spectroscopy
  20. GRB 140506A: Swift detection of a burst with an optical counterpart
  21. GRB 140430A: iTelescope.Net T16 Optical Observation
  22. GRB 140502A: MITSuME Okayama upper limits
  23. GRB 140430A: BVR-band IAC80 observations
  24. GRB 140430A: Further VATT Optical Observations
  25. GRB 140430A: VATT Optical Observations
  26. GRB 140430A: VLT/X-shooter redshift
  27. GRB 140430A: NOT optical observations
  28. GRB 140430A : Liverpool Telescope optical afterglow observations
  29. GRB140430A: Swift detection of a burst with an optical counterpart
  30. GRB 140428A: Swift/UVOT Upper Limits
  31. GRB 140423A: RTT150 optical observations
  32. Trigger 597570: Swift detection of SGR 1806-20
  33. GRB 140428A: 1.5m OSN I-band detection
  34. GRB 140428A: Keck detection of a red optical afterglow candidate
  35. GRB 140423A: MITSuME Akeno upper limits
  36. GRB 140423A Third epoch pODI photometry
  37. GRB 140423A: Continued RATIR Optical and NIR Observations
  38. GRB 140423A: MITSuME Akeno Optical observation
  39. DG CVn: optical observations
  40. GRB 140423A: RATIR Optical and NIR Observations
  41. GRB 140423A: NOT Afterglow Observations
  42. GRB 140419A: Continued Mondy optical observations
  43. GRB 140423A pODI/WIYN afterglow photometry
  44. GRB 140423A, Optical Observations
  45. GRB 140423A: Kanata/HONIR Optical and NIR Observations
  46. GRB 140423A: MITSuME Okayama Optical Observation
  47. GRB 140423A: KAIT Optical Detection
  48. GRB 140423A: Nanshan optical upper limit
  49. GRB 140423A: P60 Observations
  50. GRB 140423A: KWFC z-band photometry
  51. GRB 140419A, LOAO R-band observations
  52. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  53. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  54. GRB 140423A optical observations with pODI/WIYN at KPNO
  55. GRB 140423A: optical afterglow candidate
  56. GRB 140419A: Mondy optical observations
  57. GRB 140419A: Continued RATIR Optical and NIR Observations
  58. GRB140419A: NOT optical observations
  59. GRB 140419A: KAIT Refined Analysis
  60. GRB 140419A: Continued RATIR Optical and NIR Observations
  61. GRB 140419A, Optical Observations
  62. GRB 140419A: MITSuME Ishigakijima Optical Observation
  63. GRB 140419A: MITSuME Okayama Optical Observation
  64. GRB 140419A: Swift UVOT refined analysis
  65. GRB 140419A: P60 Observations
  66. GRB 140419A: T24 optical observations
  67. GRB 140419A: CARMA early 3mm detection
  68. GRB 140419A: RATIR Optical and NIR Observations
  69. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  70. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  71. GRB 140419A: Swift detection of a burst with optical afterglow
  72. GRB 140414A: Swift/UVOT Upper Limit
  73. GRB 140414A: TNG optical observations
  74. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  75. GRB 140413A: TAROT La Silla observatory optical observations
  76. GRB 140408A: 1.5m OSN optical upper limit
  77. GRB 140408A: MITSuME Akeno Optical observation
  78. Fermi418277210: iPTF optical observations
  79. GRB 140408A: RATIR Optical Upper Limits
  80. GRB 140408A: Swift/UVOT Upper Limits
  81. GRB 140408A: MITSuME Okayama upper limits
  82. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  83. GRB 140402A: Swift/UVOT Upper Limits
  84. GRB 140331A: Continued RATIR Optical and NIR Observations
  85. GRB 140402A: MASTER optical observations
  86. GRB 140301A: Zadko observatory - Gingin optical observations
  87. GRB 140331A: Swift/UVOT Upper Limits
  88. GRB 140302A: TAROT La Silla observatory optical observations
  89. GRB 140323A: Zadko observatory - Gingin optical observations
  90. GRB 140331A: Zadko observatory - Gingin optical observations
  91. GRB 140129B: AAO optical upper limit
  92. GRB 140129A: Mondy optical observations
  93. GRB 140331A: MITSuME Okayama upper limits
  94. GRB 140331A: RATIR Optical and NIR Observations
  95. GRB 140320D: MASTER optical observations
  96. GRB 140226A/iPTF14yb: Mondy optical observations
  97. GRB 140320C: Mondy optical observations and afterglow confirmation
  98. GRB 140323A: BOOTES-3 optical upper limit.
  99. GRB 140323A: Swift/UVOT Upper Limits
  100. GRB 140320A: RATIR Optical and NIR Observations

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