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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"

19600 results found.

  1. GRB170111A: REM optical/NIR observations
  2. LIGO/Virgo G268556: Early SWASP limits of ATLAS17aeu
  3. LIGO/Virgo G268556: Additional GROWTH follow up observation of iPTF Optical Transient Candidates
  4. GRB 170111A: Enhanced Swift-XRT position
  5. GRB 170111A: Swift detection of a burst
  6. LIGO/Virgo G268556: Swift/BAT data search
  7. LIGO/Virgo G268556: Lijiang Observatory GMG Telescope Upper Limit on ATLAS17aeu
  8. LIGO/Virgo G268556: NOWT of EWE, Xinglong 0.6/0.9m, Xuyi 1m optical upper limits of ATLAS17aeu and a reminder of GCN 20394
  9. LIGO/Virgo G268556/GW170104: TNG observations of ATLAS17aeu
  10. LIGO/Virgo G268556: Pan-STARRS1 observations and summary of transient sources
  11. LIGO/Virgo G268556: GWAC_F60B (60cm) follow-up two events of EWE001 and EWE002
  12. LIGO/Virgo G268556: Swift/UVOT observations of ATLAS17aeu
  13. LIGO/Virgo G268556: CALET Observations
  14. LIGO/Virgo G268556: EWE001 and EWE002- two events close to GCN 20382 with the skymap
  15. LIGO/Virgo G268556/GW170104: Global MASTER Net second OT detection
  16. Swift Trigger 730874 is not astrophysical
  17. LIGO/Virgo G268556: HAWC follow-up of northern sky
  18. LIGO/Virgo G268556/GW170104: Global MASTER Net observations and first OT detection
  19. Swift Trigger 730513 is not an astrophysical event
  20. LIGO/Virgo G268556: ATLAS imaging of the skymap
  21. LIGO/Virgo G268556: AGILE MCAL and Super-AGILE Observations
  22. LIGO/Virgo G268556: Fermi-LAT search for high-energy gamma-ray counterpart
  23. LIGO/Virgo G268556: Mini-MegaTORTORA follow-up observations
  24. LIGO/Virgo G211117 / GW151226: LOFAR follow-up
  25. LIGO/Virgo G268556: ANTARES search
  26. LIGO/Virgo G268556: observation regions by Project Mini-GWAC of SVOM
  27. LIGO/Virgo G268556: INTEGRAL search of temporally coincident prompt hard X-ray emission
  28. LIGO/Virgo G268556: Fermi GBM Observations
  29. GRS 1716-249/GRO J1719-24/V2293 Oph, Swift-BAT refined analysis
  30. GRB 170101A: Swift-BAT refined analysis
  31. GRB 170101B: Astrosat CZTI detection
  32. GRB 161224A: TSHAO optical observations
  33. GRB 161224A: Swift/UVOT Upper limits
  34. GRB 161224A: Swift-XRT refined Analysis
  35. Trigger 728094, Swift-BAT refined analysis
  36. GRB 161219B: UKIRT near-IR afterglow detection
  37. GRB 161219B: SALT observations
  38. GRB 161220A: GROND Upper Limits
  39. GRB 161219B: ISON/Terskol optical observations
  40. GRB 161219B: Swift-BAT refined analysis
  41. GRB 161220A: Swift/UVOT Upper Limits
  42. GRB 161219B: Swift/UVOT Detection
  43. GRB 161219B: Watcher optical observations
  44. Konus-Wind observation of GRB 161218B
  45. IPN Triangulation of GRB 161218B (long/very bright)
  46. GRB 161220A: Swift detection of a burst
  47. GRB 161219B: GROND afterglow observations
  48. GRB 161219B: Enhanced Swift-XRT position
  49. GRB 161219B: Swift detection of a burst with an optical afterglow
  50. Konus-Wind observation of GRB 161218A
  51. Swift Trigger 727422 is not an astrophysical event.
  52. GRB 161218A: TAROT Calern observatory optical observations
  53. GRB 161217A: TAROT Calern observatory optical observations
  54. GRB 161217A: MITSuME Okayama upper limits
  55. GRB 161217A: Swift/UVOT Upper Limits
  56. GRB 161214B: AbAO and ISON/Terskol optical observations
  57. GRB 161217A: Enhanced Swift-XRT position
  58. GRB 161217A: Swift detection of a burst
  59. GRB 161214B: Mondy optical observations
  60. Fermi-LAT Gamma-ray Observations of IceCube-161210
  61. GRB 161214B: Swift/UVOT Afterglow Confirmation
  62. GRB 161214B: RATIR Optical and Near-Infrared Observations
  63. GRB 161214B: Enhanced Swift-XRT position
  64. GRB 161214B: TAROT Calern observatory optical observations
  65. GRB 161214B: Chante-perdrix observatory optical observations
  66. GRB 161214B: Swift/UVOT Observations
  67. GRB 161214B: NOT optical observations, possible counterpart
  68. GRB 161214A: NOT observations of the afterglow
  69. GRB 161214B: Swift detection of a burst
  70. GRB 161214A: GROND afterglow observations
  71. GRB 161214A: TAROT Calern observatory optical observations
  72. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  73. HAWC follow-up on IceCube-161210
  74. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  75. GRB 161129A: GTC redshift of the likely host galaxy
  76. GRB 161129A: KWFC z-band photometry
  77. GRB 161202A: RATIR Optical and NIR Observations
  78. GRB 161202A: Swift-BAT refined analysis
  79. GRB 161202A: Swift/UVOT Upper Limits
  80. GRB 161202A: MITSuME Okayama upper limits
  81. GRB 161202A: Fermi-LAT detection
  82. GRB 161202A: Enhanced Swift-XRT position
  83. GRB 161202A: Swift detection of a burst
  84. GRB 161129A: Mondy optical observations
  85. GRB 161129A: ISON/UAFO optical observations
  86. GRB 161129A: MITSuME Okayama Ks-band Observation
  87. GRB 160821B: HST detection of the optical and IR counterpart
  88. GRB 161129A: MITSuME Okayama Optical Observation
  89. GRB 161129A: Swift/UVOT Detection
  90. GRB 161129A: Tautenburg Ic-band observations
  91. GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy
  92. GRB 161129A: Enhanced Swift-XRT position
  93. GRB 161129A: Swift detection of a burst
  94. GRB 161123A: Swift-XRT observations
  95. GRB 161123A: Tiled Swift observations
  96. GRB 161117A: SMARTS optical/IR afterglow observations
  97. Swift Trigger 723124 is probably not a GRB
  98. GRB 161117A iTelescope observation
  99. GRB 161117A: TAROT La Silla observatory optical observations
  100. GRB 161117A: GMG observation limit

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