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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"

19594 results found.

  1. GRB 200806A: AbAO optical upper limit
  2. GRB 200806A: MITSuME Akeno optical upper limits
  3. GRB 200806A: Enhanced Swift-XRT position
  4. GRB 200806A: Swift detection of a burst
  5. GRB 200803B: MASTER possibly OT discovery
  6. GRB 200803A: Fermi GBM detection
  7. GRB 200803A: Swift-XRT afterglow detection
  8. GRB 200803A: Tiled Swift observations
  9. AX J1846.4-0258: Swift-BAT refined analysis
  10. GRB 200729A: RT-22 observations at 36.8 GHz
  11. GRB 200729A: Nanshan/NEXT optical upper limit
  12. GRB 200729A: Swift/UVOT Upper Limits
  13. GRB 200729A: TNG NIR upper limits
  14. GRB 200729A: NOT optical upper limits
  15. GRB 200729A: Enhanced Swift-XRT position
  16. GRB 200729A: Swift detection of a burst
  17. GRB 200723A: Swift ToO observations
  18. GRB 200723A: GOTO candidate afterglow and host galaxy
  19. GRB 200714E: Swift-XRT afterglow detection
  20. GRB 200716C: VIRT optical detection.
  21. AMON IC_HAWC 170720: No Neutrino Counterpart detected with ANTARES
  22. GRB 200716C: Optical observations from HCT
  23. GRB 200716C: Enhanced Swift-XRT position
  24. GRB 200716C: Swift detection of a burst with an optical counterpart
  25. IPN triangulation of GRB 200716A
  26. GRB 200715A: Swift ToO observations
  27. GRB 200714E: Swift ToO observations
  28. Fermi GRB 200714D: Global MASTER-Net observations report
  29. GRB 200713A: Enhanced Swift-XRT position
  30. GRB 200713A: Swift detection of a burst
  31. GRB 200711A: AbAO optical upper limit
  32. GRB 200711A: Swift/UVOT Upper Limits
  33. GRB 200711A: Swift-BAT refined analysis
  34. GRB 200711A: Swift-XRT refined Analysis
  35. GRB 200711A: Swift detection of a burst
  36. Update of alert from the HAWC Burst Monitor HAWC-200709A
  37. GRB 200709B/HAWC-200907A: Swift-XRT further observations
  38. HAWC-200907A: No Neutrino Counterpart detected with ANTARES
  39. GRB 200709B: Tiled Swift observations
  40. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  41. GRB 200630A: Swift/UVOT Upper Limits
  42. GRB 200623A: Swift XRT further observations
  43. GRB 200630A: Enhanced Swift-XRT position
  44. GRB 200630A: Swift detection of a burst
  45. GRB 200625A: Fermi-LAT detection is likely a flare from PKS 1127-14
  46. GRB 200623A: LBT optical observations
  47. GRB 200625A: Swift ToO observations
  48. GRB 200623A: MMT observations at XRT Source #3
  49. GRB 200623A: Swift/UVOT Upper Limits
  50. IPN triangulation of GRB 200623B (short)
  51. GRB 200623A: OAJ deep multi-color imaging, XRT #2 is pre-detected
  52. GRB 200623A: TNG optical observations
  53. GRB 200623A: AbAO afterglow candidate within XRT #2
  54. GRB 200623A: Swift ToO observations
  55. IceCube-200620A: No significant detection in HAWC
  56. Fermi-LAT Gamma-ray Observations of IceCube-200620A
  57. GRB 200613A: R-band observations from HCT
  58. GRB 200613A: Further Liverpool Telescope observations
  59. GRB 200613A: SAO RAS optical observations
  60. IceCube-200530A - SN2020lls likely unrelated
  61. Swift/UVOT Observations of IceCube 200615A
  62. Swift-XRT observations of IceCube 200615A
  63. IceCube-200615A: No significant detection in HAWC
  64. GRB 200613A: Jet-break from Xinglong-2.16m optical observations
  65. Fermi-LAT Gamma-ray Observations of IceCube-200615A
  66. IceCube-200614A: No significant detection in HAWC
  67. Fermi-LAT Gamma-ray Observations of IceCube-200614A and detection of a new gamma-ray source, Fermi J0202.8+3132
  68. GRB 200613A: MITSuME Akeno optical upper limits
  69. IceCube-200615A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  70. IceCube-200614A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  71. GRB 200613A: Continued Xinglong-2.16m optical observations
  72. GRB 200613A: Swift/UVOT Detection
  73. GRB 200613A: Xinglong-2.16m optical observations
  74. GRB 200613A: Liverpool Telescope observations
  75. GRB 200613A: Swift-XRT afterglow detection
  76. GRB 200613A: Swift ToO observations
  77. GRB 200612A: Swift/UVOT Upper Limits
  78. GRB 200612A: Enhanced Swift-XRT position
  79. GRB 200612A: Swift detection of a burst
  80. GRB 200608A: Swift detection of a burst
  81. IPN triangulation of GRB 200605A (short)
  82. GRB 200529A: Swift/UVOT Upper Limits
  83. Fermi-LAT Gamma-ray Observations of IceCube-200530A
  84. GRB 200529A: MITSuME Akeno optical upper limits
  85. IceCube-200530A: No significant detection in HAWC
  86. IceCube-200530A: No ANTARES neutrino counterpart
  87. IceCube-200530A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  88. GRB 200529A: Swift-XRT refined Analysis
  89. GRB 200528A: Assy optical upper limit
  90. GRB 200529A: Enhanced Swift-XRT position
  91. GRB 200529A: KAIT Optical Afterglow Confirmation
  92. GRB 200529A: NOT optical afterglow
  93. GRB 200529A: Swift detection of a burst
  94. GRB 200528A: NOT optical upper limits
  95. GRB 200528A: Swift/UVOT Upper Limits
  96. GRB 200528A: Nanshan/NEXT optical upper limit
  97. GRB 200528A: Enhanced Swift-XRT position
  98. GRB 200528A: MITSuME Akeno optical upper limits
  99. GRB 200528A: Swift detection of a burst
  100. GRB 200524A: Assy optical observations

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