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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"

15251 results found.

  1. GRB 141004A: RATIR Late Time Optical and NIR Observations
  2. Konus-Wind observation of GRB 141017A
  3. GRB 141017A: GROND Afterglow Confirmation
  4. Konus-Wind observation of GRB 141011A
  5. GRB 141011A: Fermi GBM detection
  6. GRB141004A: Host galaxy redshift form GTC
  7. GRB 141005A: Additional P60 imaging and afterglow confirmation
  8. GRB 141004A: Fermi GBM observation
  9. GRB 141004A: GROND observations
  10. GRB 141005A: GROND observations
  11. Konus-Wind observation of GRB 141005A
  12. GRB 141005A: Swift/UVOT Upper Limits
  13. GRB141004A: NOT imaging and spectroscopy
  14. GRB 141005A: Fermi GBM Detection
  15. GRB 141004A: RATIR Optical Observations
  16. GRB 141005A: RATIR Optical Observations
  17. GRB 141004A: TNG photometric and spectroscopic observations
  18. Swift observations of HD 305560
  19. GRB 140928A: Swift-XRT follow-up observations
  20. Swift possible detection of the Be star HD 305560
  21. GRB 140930B: GROND observations
  22. Konus-Wind observation of GRB 140930B
  23. GRB 140930B: Keck NIR imaging
  24. Konus-Wind observation of GRB 140928A
  25. GRB 140928A: Fermi GBM detection
  26. GRB 140928A: Fermi-LAT detection
  27. GRB 140919A: Fermi GBM observation
  28. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  29. GRB 140909A: Confirmation of the Swift-XRT afterglow
  30. GRB 140903A: Chandra detection of the afterglow
  31. Konus-Wind observation of GRB 140906C
  32. GRB 140907A: MASTER optical observations
  33. GRB 140907A: MITSuME Akeno Optical Observation
  34. GRB 140907A: Fermi GBM Detection
  35. GRB 140907A: MITSuME Ishigakijima Optical Observation
  36. GRB140907A: MITSuME Okayama Optical Observation
  37. GRB 140906B: Fermi GBM Detection of a Long GRB
  38. GRB 140907A : Optical observations from Nanshan
  39. GRB 140906A - Fermi GBM Detection
  40. GRB 140903A: Possible optical variability
  41. GRB 140903A: NOT optical and NIR observations
  42. GRB 140903A: FTN observations
  43. GRB 140903A: 6 GHz VLA detection
  44. GRB 140903A: Pan STARRS images of the field
  45. GRB 140901B: Fermi GBM detection
  46. GRB 140901B found in ground analysis of BAT data
  47. GRB 140903A: P60 Optical Observations
  48. GRB 140829A: Fermi GBM Detection
  49. Konus-Wind observation of GRB 140825A
  50. GRB 140828A: Fermi GBM observation
  51. IPN Triangulation of GRB 140824B
  52. GRB 140818B: TLS observations
  53. GRB 140824B: Swift observations
  54. GRB 140817A: NOT optical observations
  55. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  56. GRB 140818A: GROND confirmation of afterglow candidate
  57. GRB140819A: Deep GROND Upper Limits
  58. Fermi trigg_num 430148973: OSN I-band observations
  59. Konus-Wind observation of GRB 140818A
  60. GRB 140818B : Correction to GCN 16713
  61. GRB140818B : GROND afterglow candidate
  62. GRB 140818A - Fermi GBM Detection
  63. GRB 140818A: Correction to GCN 16702
  64. Konus-Wind observation of GRB 140817A
  65. GRB 140818A Tiled Swift observations
  66. GRB 140818A: MAXI/GSC detection
  67. GRB 140817A: Fermi GBM Detection
  68. GRB 140815A: A long GRB detected by INTEGRAL
  69. GRB 140814A: MAXI/GSC detection
  70. GRB 140808A: Confirmation of the Swift-XRT afterglow
  71. GRB140809A: Fermi GBM observation
  72. GRB 140810A: Fermi GBM observation
  73. Konus-Wind observation of GRB 140810A
  74. GRB140810A: Fermi-LAT detection
  75. Swift trigger 609139 is probably 4U 1850-03
  76. Swift observations of possible GRB 140809A candidate
  77. Konus-Wind observation of GRB 140808A
  78. GRB 140801A: GROND Afterglow detection, unbroken decay
  79. GRB140801A: Swift/XRT further observations
  80. GRB 140730A: GROND Upper limits
  81. Konus-Wind observation of GRB 140801A
  82. GRB 140801A: Fermi GBM observation
  83. GRB 140801A: NOT afterglow confirmation
  84. Konus-Wind observation of GRB 140729A
  85. GRB 140729A: Fermi-GBM detection
  86. Correction to Fermi-LAT GCN Circular 16633
  87. GRB 140729A Tiled Swift observations
  88. GRB 140729A: Fermi-LAT detection
  89. GRB 140723A: LCO-Sutherland optical candidate retraction
  90. GRB 140723A: MASTER optical observation
  91. Konus-Wind observation of GRB 140723A
  92. GRB 140723A: Fermi GBM detection
  93. GRB 140723A Tiled Swift observations
  94. GRB 140723A: Fermi-LAT detection
  95. Konus-Wind observation of GRB 140721A
  96. GRB 140716A: GROND confirmation of the afterglow
  97. Konus-Wind observation of GRB 140716A
  98. GRB 140713A: 10.4-m GTC deep optical observation
  99. Swift observations of a flare from UX Ari
  100. GRB 140716A found in ground analysis of Swift-BAT data

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