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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"

5862 results found.

  1. GRB 140423A: NOT Afterglow Observations
  2. GRB 140423A pODI/WIYN afterglow photometry
  3. Swift Trigger 596958 is probably the flare star: DG CVn
  4. GRB 140423A: Further Observations with Swift/UVOT
  5. GRB 140423A: KWFC z-band photometry
  6. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  7. GRB 140423A: Swift/UVOT detection of a possible counterpart
  8. GRB 140423A: Swift-XRT observations
  9. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  10. GRB 140423A optical observations with pODI/WIYN at KPNO
  11. GRB 140423A: optical afterglow candidate
  12. GRB 140419A: MITSuME Okayama Optical Observation
  13. GRB 140419A: Swift detection of a burst with optical afterglow
  14. Konus-Wind observation of GRB 140413A
  15. Swift Trigger 595616: a possible GRB
  16. IPN Triangulation of GRB 140329A
  17. GRB 140320B: P60 detection of a very red afterglow
  18. GRB 140320B: Swift-XRT detection of the afterglow
  19. GRB 140320B: ISON-NM optical observations
  20. GRB 140320B: A long GRB detected by INTEGRAL
  21. GRB 140320B: FTN optical afterglow candidate
  22. GRB 140318A: Swift detection of a burst
  23. IPN Triangulation of GRB 140306A
  24. GRB 140302A: Swift detection of a burst
  25. GRB 140301A: Swift detection of a burst
  26. PTF14yb: GROND Transient Detection
  27. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  28. GRB 140221A: MAXI/GSC detection
  29. GRB 140215A: P60 observations
  30. GRB 140215A: KAIT Optical Detection
  31. GRB140215A: Prompt Observations with Discovery Channel Telescope
  32. GRB 140215A: Swift detection of a burst with optical counterpart
  33. Trigger 586482: Swift detection of GROJ1744-28
  34. GRB 140209A: Fermi GBM observation
  35. GRB 140206A: Optical Observations via Virtual Telescope
  36. GRB 140206A: Swift/UVOT Detection
  37. GRB 140206A: ISON-Ussuriysk optical observations
  38. GRB 140206A: MASTER OT detection
  39. GRB140206A - Optical afterglow candidate
  40. GRB 140206A: Swift detection of a burst
  41. GRB 140129B: MASTER OT early light curve
  42. GRB 140129A: MITSuME Okayama upper limits
  43. GRB 140129B: Swift detection of a burst with an optical afterglow
  44. Konus-Wind observation of GRB 131215A
  45. GRB 140103A: MASTER-Net early OT detection
  46. GRB 140104B: Further Swift XRT observations
  47. GRB 140108A: Mondy optical upper limit
  48. GRB 140108A: Swift detection of a burst
  49. GRB 140102A: Swift detection of a burst with optical counterpart
  50. GRB 131229A: Swift detection of a burst
  51. GRB 131225A: MAXI/GSC detection
  52. GRB 131215A: MAXI/GSC detection
  53. GRB 131209A: Swift XRT and UVOT observations
  54. GRB 131209A: Fermi GBM observation
  55. IPN Triangulation of GRB 131209A
  56. GRB131205A : GROND Observations
  57. GRB 131205A: Enhanced Swift-XRT position
  58. GRB 131205A: Swift detection of a burst
  59. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  60. GRB 131202A: Swift detection of a burst
  61. GRB 131127A: Swift detection of a burst
  62. GRB 131030A, Optical Observations
  63. GRB 131117A: Swift/UVOT Detection
  64. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  65. GRB 131030A: MITSuME Akeno Optical observation
  66. GRB 131108A: CARMA 3mm detection
  67. GRB 131108A: Swift/UVOT Detection
  68. GRB 131108A: TAROT-Calern optical observation
  69. GRB 131108A: Fermi-LAT refined analysis
  70. GRB 131108A: NOT optical observations
  71. GRB 131105A: Swift detection of a burst
  72. GRB 131103A: Swift detection of a burst
  73. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  74. IPN Triangulation of GRB 131014A
  75. GRB 131018B: Swift-XRT observations
  76. GRB 131018A: Swift detection of a burst
  77. GRB 131014A: Suzaku WAM observation of the prompt emission
  78. Konus-Wind observation of GRB 131014A
  79. GRB 131014A: Fermi-LAT detection
  80. GRB 131014A: Fermi GBM detection
  81. GRB 130930A: Swift detection of a burst
  82. GRB 130831A: Continued RATIR Optical and NIR Observations
  83. GRB 130929A: Swift detection of a burst
  84. Fermi LAT Upper Limits on GRB 130925A
  85. GRB 130925A: optical upper limit
  86. GRB 130925A: Continued RATIR Optical and NIR Observations
  87. GRB 130925A: Fermi GBM Detection
  88. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  89. GRB 130925A: RATIR Optical and NIR Observations
  90. Fermi GBM detection of GRB 130925A and a possible precursor
  91. GRB 130925A: Enhanced Swift-XRT position
  92. GRB 130925A: VLT/X-shooter redshift
  93. GRB 130925A: MAXI/GSC detection
  94. GRB 130925A: GROND afterglow candidate
  95. GRB 130925A: Swift detection of a burst
  96. GRB 130831A: RTT150 optical observations
  97. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  98. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  99. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  100. GRB 130913A detected in ground analysis of Swift-BAT data

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