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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"

43902 results found.

  1. Swift Trigger 730513 is not an astrophysical event
  2. LIGO/Virgo G268556: ATLAS imaging of the skymap
  3. LIGO/Virgo G268556: DESGW/DECam observations
  4. LIGO/Virgo G268556: AGILE MCAL and Super-AGILE Observations
  5. LIGO/Virgo G268556: Fermi-LAT search for high-energy gamma-ray counterpart
  6. LIGO/Virgo G211117 / GW151226: LOFAR follow-up
  7. LIGO/Virgo G268556: Swift-XRT sources
  8. LIGO/Virgo G268556: ANTARES search
  9. LIGO/Virgo G268556: observation regions by Project Mini-GWAC of SVOM
  10. GRB 170102A: Astrosat CZTI detection
  11. GRB170104.78 MASTER-Net OT detection
  12. LIGO/Virgo G268556: INTEGRAL search of temporally coincident prompt hard X-ray emission
  13. LIGO/Virgo G268556: Fermi GBM Observations
  14. LIGO/Virgo G268556: Identification of a GW CBC Candidate
  15. GRB 170102A: POLAR observation
  16. Konus-Wind observation of GRB 170101A
  17. GRB 170101B: POLAR observation
  18. GRB 170101B: Lomonosov BDRG gamma ray discovery
  19. GRB 170101A: Lomonosov BDRG gamma ray discovery
  20. Swift trigger 729600 is not an astrophysical event
  21. GRB 161228C: POLAR observation
  22. GRS 1716-249/GRO J1719-24/V2293 Oph, Swift-BAT refined analysis
  23. GRB 170101A: POLAR observation
  24. GRB 161229A: POLAR observation
  25. GRB 170101A: Swift-BAT refined analysis
  26. Trigger 729410: Swift detection of V2293 Oph
  27. GRB 170101B: Astrosat CZTI detection
  28. GRB 170101B: Fermi GBM detection
  29. GRB 170101A: Swift detection of a burst
  30. GRB 161228B: POLAR Observation
  31. GRB 161228A: POLAR Observation
  32. GRB161219B - Anticipated hyperluminal evidence
  33. GRB 161214B: MASTER-Kislovodsk early optical observations
  34. GMRT radio detection of GRB 161219B
  35. GRB 161214A: MASTER-IAC early optical observations
  36. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  37. Fermi GBM trigger 504490076/161227005 is not a GRB
  38. GRB 161224A: TSHAO optical observations
  39. GRB 161224A: Swift/UVOT Upper limits
  40. GRB 161224A: Swift-XRT refined Analysis
  41. GRB 161224A: Swift-BAT refined analysis
  42. Trigger 728094, Swift-BAT refined analysis
  43. Swift Trigger 728268: a possible GRB
  44. Fermi GBM trigger 504233075/161224301 is not a GRB
  45. Swift Trigger 728094: a possible GRB
  46. GRB 161219B: UKIRT near-IR afterglow detection
  47. GRB 161219B: POLAR Observation
  48. GRB161219.78 MASTER-Net OT detection
  49. Fermi GBM trigger 504061556/161222046 is not a GRB
  50. GRB 161219B: Rapid ALMA Observations & Detection
  51. Fermi GBM trigger 504043585/161221838 is not a GRB
  52. GRB 161220A: Swift-BAT refined analysis
  53. GRB 161218B: Astrosat CZTI detection
  54. Konus-Wind observation of GRB 161219B
  55. GRB 161219B: SALT observations
  56. GRB 161219B: VLT/X-shooter redshift
  57. Fermi GBM trigger 503982114/161221126 is not a GRB
  58. GRB 161214B: optical spectroscopy of the foreground SDSS object
  59. GRB 161202A: 15 GHz upper limits from AMI
  60. GRB 161129A: 15 GHz upper limits from AMI
  61. GRB 161220A: Swift-XRT refined Analysis
  62. GRB 161220A: LCO-FTS observations
  63. GRB 161219B: MITSuME Akeno Optical Observation
  64. GRB 161219B: VLA Detection
  65. GRB 161220A: GROND Upper Limits
  66. GRB 161217C: POLAR observation
  67. GRB 161217B: POLAR Observation
  68. GRB 161219B: ISON/Terskol optical observations
  69. GRB 161219B: Swift-BAT refined analysis
  70. GRB 161219B: Swift/UVOT Detection
  71. GRB 161219B: Watcher optical observations
  72. Konus-Wind observation of GRB 161218B
  73. IPN Triangulation of GRB 161218B (long/very bright)
  74. GRB 161220A: Swift detection of a burst
  75. GRB 161212A: POLAR Detection
  76. GRB 161219B: LCO Sutherland observations
  77. GRB 161219B: GROND afterglow observations
  78. GRB 161219B: Swift-XRT refined Analysis
  79. GRB 161219B: Enhanced Swift-XRT position
  80. GRB 161219B: Swift detection of a burst with an optical afterglow
  81. GRB 161219A: a long GRB detected by INTEGRAL
  82. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  83. GRB 161218A: Swift-BAT refined analysis
  84. Konus-Wind observation of GRB 161218A
  85. Swift Trigger 727422 is not an astrophysical event.
  86. GRB 161218A: TAROT Calern observatory optical observations
  87. GRB 161217A: TAROT Calern observatory optical observations
  88. GRB 161218B: POLAR observation
  89. GRB 161218A: POLAR observation
  90. GRB 161218B: Fermi GBM detection
  91. GRB 161217A: Swift-BAT refined analysis
  92. GRB 161218A: Swift detection of a burst
  93. GRB 161217A: Swift-XRT refined Analysis
  94. GRB 161214B: AbAO and ISON/Terskol optical observations
  95. GRB 161217A: Enhanced Swift-XRT position
  96. GRB 161207A: POLAR observation
  97. GRB 161217A: Swift detection of a burst
  98. GRB 161214B: Mondy optical observations
  99. GRB 161213A: POLAR Observation
  100. GRB 161207B: POLAR observation

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