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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"

15247 results found.

  1. GRB 141011A: Fermi GBM detection
  2. GRB141004A: Host galaxy redshift form GTC
  3. GRB 141005A: Additional P60 imaging and afterglow confirmation
  4. GRB 141004A: Fermi GBM observation
  5. GRB 141004A: GROND observations
  6. GRB 141005A: GROND observations
  7. Konus-Wind observation of GRB 141005A
  8. GRB 141005A: Swift/UVOT Upper Limits
  9. GRB141004A: NOT imaging and spectroscopy
  10. GRB 141005A: Fermi GBM Detection
  11. GRB 141004A: RATIR Optical Observations
  12. GRB 141005A: RATIR Optical Observations
  13. GRB 141004A: TNG photometric and spectroscopic observations
  14. Swift observations of HD 305560
  15. GRB 140928A: Swift-XRT follow-up observations
  16. Swift possible detection of the Be star HD 305560
  17. GRB 140930B: GROND observations
  18. Konus-Wind observation of GRB 140930B
  19. GRB 140930B: Keck NIR imaging
  20. Konus-Wind observation of GRB 140928A
  21. GRB 140928A: Fermi GBM detection
  22. GRB 140928A: Fermi-LAT detection
  23. GRB 140919A: Fermi GBM observation
  24. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  25. GRB 140909A: Confirmation of the Swift-XRT afterglow
  26. GRB 140903A: Chandra detection of the afterglow
  27. Konus-Wind observation of GRB 140906C
  28. GRB 140907A: MASTER optical observations
  29. GRB 140907A: MITSuME Akeno Optical Observation
  30. GRB 140907A: Fermi GBM Detection
  31. GRB 140907A: MITSuME Ishigakijima Optical Observation
  32. GRB140907A: MITSuME Okayama Optical Observation
  33. GRB 140906B: Fermi GBM Detection of a Long GRB
  34. GRB 140907A : Optical observations from Nanshan
  35. GRB 140906A - Fermi GBM Detection
  36. GRB 140903A: Possible optical variability
  37. GRB 140903A: NOT optical and NIR observations
  38. GRB 140903A: FTN observations
  39. GRB 140903A: 6 GHz VLA detection
  40. GRB 140903A: Pan STARRS images of the field
  41. GRB 140901B: Fermi GBM detection
  42. GRB 140901B found in ground analysis of BAT data
  43. GRB 140903A: P60 Optical Observations
  44. GRB 140829A: Fermi GBM Detection
  45. Konus-Wind observation of GRB 140825A
  46. GRB 140828A: Fermi GBM observation
  47. IPN Triangulation of GRB 140824B
  48. GRB 140818B: TLS observations
  49. GRB 140824B: Swift observations
  50. GRB 140817A: NOT optical observations
  51. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  52. GRB 140818A: GROND confirmation of afterglow candidate
  53. GRB140819A: Deep GROND Upper Limits
  54. Fermi trigg_num 430148973: OSN I-band observations
  55. Konus-Wind observation of GRB 140818A
  56. GRB 140818B : Correction to GCN 16713
  57. GRB140818B : GROND afterglow candidate
  58. GRB 140818A - Fermi GBM Detection
  59. GRB 140818A: Correction to GCN 16702
  60. Konus-Wind observation of GRB 140817A
  61. GRB 140818A Tiled Swift observations
  62. GRB 140818A: MAXI/GSC detection
  63. GRB 140817A: Fermi GBM Detection
  64. GRB 140815A: A long GRB detected by INTEGRAL
  65. GRB 140814A: MAXI/GSC detection
  66. GRB 140808A: Confirmation of the Swift-XRT afterglow
  67. GRB140809A: Fermi GBM observation
  68. GRB 140810A: Fermi GBM observation
  69. Konus-Wind observation of GRB 140810A
  70. GRB140810A: Fermi-LAT detection
  71. Swift trigger 609139 is probably 4U 1850-03
  72. Swift observations of possible GRB 140809A candidate
  73. Konus-Wind observation of GRB 140808A
  74. GRB 140801A: GROND Afterglow detection, unbroken decay
  75. GRB140801A: Swift/XRT further observations
  76. GRB 140730A: GROND Upper limits
  77. Konus-Wind observation of GRB 140801A
  78. GRB 140801A: Fermi GBM observation
  79. GRB 140801A: NOT afterglow confirmation
  80. Konus-Wind observation of GRB 140729A
  81. GRB 140729A: Fermi-GBM detection
  82. Correction to Fermi-LAT GCN Circular 16633
  83. GRB 140729A Tiled Swift observations
  84. GRB 140729A: Fermi-LAT detection
  85. GRB 140723A: LCO-Sutherland optical candidate retraction
  86. GRB 140723A: MASTER optical observation
  87. Konus-Wind observation of GRB 140723A
  88. GRB 140723A: Fermi GBM detection
  89. GRB 140723A Tiled Swift observations
  90. GRB 140723A: Fermi-LAT detection
  91. Konus-Wind observation of GRB 140721A
  92. GRB 140716A: GROND confirmation of the afterglow
  93. Konus-Wind observation of GRB 140716A
  94. GRB 140713A: 10.4-m GTC deep optical observation
  95. Swift observations of a flare from UX Ari
  96. GRB 140716A found in ground analysis of Swift-BAT data
  97. GRB 140713A: Fermi GBM detection
  98. GRB 140713A: T100 observations
  99. GRB 140710B: a long GRB detected with INTEGRAL
  100. GRB 140709A: Continued RATIR Optical and NIR Observations

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