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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"

41772 results found.

  1. GRB 140521A: Swift detection of a burst
  2. GRB 140512A: Redshift from NOT
  3. GRB 140518A: T100 observations
  4. GRB 140518A: Continued RATIR Optical and NIR Observations
  5. GRB 140512A: MASTER prompt and afterglow optical observations
  6. GRB 140518A, Swift-BAT refined analysis
  7. GRB 140518A: Swift-XRT refined Analysis
  8. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  9. GRB 140518A: Swift/UVOT Upper Limits
  10. GRB 140518A: RATIR Optical and NIR Observations
  11. GRB 140518A: Gemini-N redshift
  12. GRB 140518A: P60 i-/z-band detections
  13. GRB 140518A: KAIT optical candidate
  14. GRB 140518A: Swift detection of a burst
  15. GRB 140516A: RATIR Optical and NIR Observations
  16. GRB 140516A: Subaru NIR imaging observations
  17. GRB 140516A: 6 GHz upper limit
  18. GRB 140516A: Gemini-North limit on an optical afterglow
  19. GRB 140516A: Swift/UVOT Upper Limits
  20. GRB 140516A: Swift-BAT refined analysis
  21. GRB 140516A: Swift-XRT refined Analysis
  22. GRB 140516A: NOT optical observations
  23. GRB 140516A: MASTER early optical observations
  24. GRB 140516A: ISON-Kislovodsk optical observations
  25. GRB 140516A: TNG optical observations
  26. GRB 140516A: Swift detection of a short burst
  27. GRB 140515A: Swift-BAT refined analysis
  28. GRB 140515A: VLA Detection
  29. GRB 140515A : TNG near-infrared observations
  30. GRB 140419A: Continued Mondy optical observations
  31. GRB 140515A: GROND observation of the afterglow
  32. GRB 140515A: Spectroscopy from the 10.4m GTC
  33. GRB 140515A: Optical observations from the 2.5 m NOT
  34. GRB 140515A: Swift-XRT refined Analysis
  35. GRB 140515B: MAXI/GSC detection
  36. GRB 140515A: KAIT Optical Upper Limit
  37. GRB 140515A: Gemini-North imaging
  38. GRB 140515A: Swift/UVOT Upper Limits
  39. GRB 140423A: HCT optical observations
  40. GRB 140515A: MITSuME Akeno upper limits
  41. GRB 140515A: Gemini-N redshift
  42. Trigger 599041: Swift detection of SFXT IGR J16479-4514
  43. GRB 140515A: Swift detection of a burst
  44. GRB 140508A: VLA detection
  45. Konus-Wind observation of GRB 140512A
  46. GRB 140423A: AAO optical upper limits
  47. GRB 140512A: Continued UVOT Observations
  48. GRB 140512A: Fermi GBM detection
  49. GRB 140512A: Xinglong TNT optical observation
  50. GRB 140508A: Mondy upper limit
  51. GRB 140508A: MITSuME Akeno Optical observation
  52. GRB 140512A: Swift-BAT refined analysis
  53. GRB140512A : GROND observations
  54. GRB 140512A: Swift-XRT refined Analysis
  55. Swift Observations of GRB 140508A
  56. GRB 140512A: Optical observations from the 2.5 m NOT
  57. GRB 140428A: GROND afterglow confirmation
  58. GRB 140512A: Mondy optical detection
  59. GRB 140512A: MASTER OT decay and early light curve
  60. GRB 140512A: Swift detection of a burst with an optical counterpart
  61. GRB 140512A: MASTER optical observations
  62. GRB 140423A: Mondy optical observations
  63. GRB 140508A: Continued RATIR Optical and NIR Observations
  64. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  65. GRB 140508A: ​HCT spectroscopy
  66. GRB 140508A: Swift/UVOT Detection
  67. GRB 140509B: MAXI/GSC detection
  68. GRB 140509A: Swift/UVOT Detection and photo-z
  69. GRB 140509A: Swift-BAT refined analysis
  70. VHE gamma-ray observations by MAGIC of SWIFT Trigger 596958
  71. GRB 140509A: Swift-XRT refined Analysis
  72. GRB 140508A: RATIR Optical and NIR Observations
  73. GRB 140508A: Optical Observations via Virtual Telescope
  74. Konus-Wind observation of GRB 140508A
  75. GRB 140508A: Swift-XRT observations
  76. GRB 140508A: WHT spectroscopy
  77. GRB 140509A: Swift detection of a burst with an optical counterpart
  78. GRB 140508A: NOT photometry and spectroscopy
  79. GRB 140508A: SAO RAS and MASTER photometric and spectroscopic observations
  80. GRB 140508A: 1.23m CAHA BVRI-band observations
  81. GRB 140508A: iPTF optical transient candidate
  82. IPN triangulation of GRB 140508A
  83. GRB 140508A: Fermi GBM detection
  84. Konus-Wind observation of GRB 140506A
  85. GRB 140430A: MITSuME Akeno upper limits
  86. GRB 140502A: ISON-NM early optical limit
  87. GRB 140506A: Fermi GBM Detection
  88. GRB 140506A: Swift/UVOT Detection
  89. GRB 140506A: Swift-BAT refined analysis
  90. GRB 140506A: VLT/X-shooter spectroscopy
  91. GRB 140506A: Swift-XRT refined Analysis
  92. GRB 140506A: Swift detection of a burst with an optical counterpart
  93. Konus-Wind observation of GRB 140423A
  94. GRB 140430A: iTelescope.Net T16 Optical Observation
  95. GRB 140430A: r'-band STELLA-I observations
  96. GRB 140502A: Swift/UVOT Upper Limits
  97. GRB 140502A: MITSuME Okayama upper limits
  98. GRB 140502A: Swift-BAT refined analysis
  99. GRB 140502A: Swift-XRT refined Analysis
  100. GRB 140430A: BVR-band IAC80 observations

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