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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"

19681 results found.

  1. GRB 170208A: Swift detection of a burst
  2. IPN Triangulation of GRB 170207A (long/very bright)
  3. GRB 170206B: Swift/UVOT Upper Limits
  4. GRB 170206B: Swift-XRT refined Analysis
  5. GRB 170206B: Enhanced Swift-XRT position
  6. GRB 170206B: Swift detection of a burst
  7. GRB 170205A: Swift/UVOT Detection of a Fading Afterglow
  8. GRB 170205A: NOT afterglow observations
  9. GRB 170205A: Enhanced Swift-XRT position
  10. GRB 170205A: RATIR Optical and NIR Observations
  11. GRB 170202A: SMARTS optical/IR afterglow observations
  12. GRB 170205A: Swift detection of a burst with an optical counterpart
  13. GRB 170202A: Zadko observatory - Gingin optical observations
  14. GRB 170202A: Etelman Observatory optical observations
  15. GRB 170202A: RATIR Optical and NIR Observations
  16. GRB 170202A: SQUEAN Observation
  17. GRB 170202A: T100 observations
  18. GRB 170202A: Swift/UVOT Detection
  19. GRB 170202A: Enhanced Swift-XRT position
  20. GRB 170202A: NOT afterglow observations
  21. GRB 170202A: Zadko observatory - Gingin optical observations
  22. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  23. GRB 170202A: Mini-MegaTORTORA upper limits
  24. GRB 170202A: Swift detection of a burst with an optical afterglow
  25. GRB 170131A: Swift/UVOT Upper Limits
  26. GRB 170131A: Swift ToO observations
  27. GRB 170127B: Swift-BAT refined analysis
  28. GRB 170127C: Swift-XRT observations
  29. GRB 170127A: GROND Upper limits
  30. GRB 170124A: CALET Gamma-Ray Burst Monitor detection
  31. GRB 170127B: Swift/UVOT Upper Limits
  32. GRB 170127A: Swift/UVOT Upper Limits
  33. GRB 170127B: Enhanced Swift-XRT position
  34. GRB 170127B: NOT r-band upper limits
  35. GRB 170127A: Enhanced Swift-XRT position
  36. GRB 170127C: Tiled Swift observations
  37. GRB 170127C: Fermi-LAT detection
  38. LIGO/Virgo G270580: HAWC follow-up observations
  39. GRB 170127B: Swift detection of a short burst
  40. GRB 170127A: Swift detection of a burst
  41. GRB 170126A: Swift/UVOT Detection of a Fading Afterglow
  42. GRB 170126A: Enhanced Swift-XRT position
  43. GRB 170126A: Swift detection of a burst with an optical counterpart
  44. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  45. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  46. GRB 170121B: AbAO optical observations
  47. LIGO/Virgo G270580: CALET Observations
  48. GRB 170121B: Swift-XRT and UVOT observations
  49. GRB 170121B: Swift ToO observations
  50. LIGO/Virgo G270580: ATLAS coverage and 4 optical transients
  51. LIGO/Virgo G270580: Fermi-LAT search for a high-energy gamma-ray counterpart
  52. LIGO/Virgo G270580: Two optical counterpart candidates from CNEOST
  53. LIGO/Virgo G270580: Swift/BAT data search
  54. LIGO/Virgo G268556: Global MASTER Net 21 OTs detection
  55. LIGO/Virgo G270580: Mini-MegaTORTORA follow-up observations
  56. LIGO/Virgo G270580: Pan-STARRS and ATLAS observations of the skymap
  57. LIGO/Virgo G270580: Observations of initial skymap by Project Mini-GWAC of SVOM
  58. LIGO/Virgo G270580: AGILE MCAL and Super-AGILE Observations
  59. LIGO/Virgo G270580 ANTARES search
  60. GRB 170117A: Swift/UVOT Upper Limits
  61. GRB 170117A: Swift-XRT observations
  62. GRB 170117A: Swift ToO observations
  63. GRB 170115A : AbAO optical upper limit
  64. GRB 170115A: Swift/UVOT Upper Limits
  65. GRB 170112A : AbAO optical observations
  66. GRB 170115B: Tiled Swift observations
  67. GRB 170115A: Enhanced Swift-XRT position
  68. GRB 170115A: Swift detection of a burst
  69. GRB 170113A: GROND afterglow observations
  70. GRB 170113A: Swift/UVOT Observations
  71. GRB 170112A: Swift/UVOT Upper Limits
  72. GRB 170113A: Enhanced Swift-XRT position
  73. GRB 170113A: Swift detection of a burst with an optical counterpart
  74. LIGO/Virgo G268556: TZAC TAROT network observations with TRE/TCA/TCH
  75. GRB 170112A: RATIR Optical and NIR Observations
  76. GRB 170112A: Swift-BAT refined analysis
  77. GRB 161219B: afterglow and SN2016jca optical observations
  78. GRB 170111A: Swift/UVOT Upper Limits
  79. GRB 170112A: Swift-XRT observations
  80. GRB 170112A: REM optical/NIR observations
  81. GRB 170112A: Swift detection of a short burst
  82. GRB170111A: REM optical/NIR observations
  83. LIGO/Virgo G268556: Early SWASP limits of ATLAS17aeu
  84. LIGO/Virgo G268556: Additional GROWTH follow up observation of iPTF Optical Transient Candidates
  85. GRB 170111A: Enhanced Swift-XRT position
  86. GRB 170111A: Swift detection of a burst
  87. LIGO/Virgo G268556: Swift/BAT data search
  88. LIGO/Virgo G268556: Lijiang Observatory GMG Telescope Upper Limit on ATLAS17aeu
  89. LIGO/Virgo G268556: NOWT of EWE, Xinglong 0.6/0.9m, Xuyi 1m optical upper limits of ATLAS17aeu and a reminder of GCN 20394
  90. LIGO/Virgo G268556/GW170104: TNG observations of ATLAS17aeu
  91. LIGO/Virgo G268556: Pan-STARRS1 observations and summary of transient sources
  92. LIGO/Virgo G268556: GWAC_F60B (60cm) follow-up two events of EWE001 and EWE002
  93. LIGO/Virgo G268556: Swift/UVOT observations of ATLAS17aeu
  94. LIGO/Virgo G268556: CALET Observations
  95. LIGO/Virgo G268556: EWE001 and EWE002- two events close to GCN 20382 with the skymap
  96. LIGO/Virgo G268556/GW170104: Global MASTER Net second OT detection
  97. Swift Trigger 730874 is not astrophysical
  98. LIGO/Virgo G268556: HAWC follow-up of northern sky
  99. LIGO/Virgo G268556/GW170104: Global MASTER Net observations and first OT detection
  100. Swift Trigger 730513 is not an astrophysical event

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