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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"

28231 results found.

  1. GRB 221009A: COATLI Continued Monitoring of the Afterglow
  2. INTEGRAL detection of a burst from SGR J1935+2154
  3. GRB 221009A: NICER follow-up observations
  4. GRB 221009A: LCOGT Optical Afterglow Detection
  5. GRB 221009A: COATLI Detection of the Afterglow
  6. GRB 221009A (Swift J1913.1+1946): Swift-BAT refined analysis
  7. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  8. Swift/XRT discovery of multiple dust-scattering X-ray rings around GRB 221009A
  9. GRB 221009A: BlackGEM optical observations
  10. GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
  11. Konus-Wind detection of GRB 221009A
  12. GRB 221009A: Lulin SLT-40cm optical observations
  13. GRB 221009A: Upper limits from a neutrino search with IceCube
  14. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  15. GRB221009A/Swift J1913.1+1946: SRG/ART-XC observation
  16. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  17. GRB221009A/Swift J1913.1+1946: Solar Orbiter STIX measurements
  18. GRB221009A/Swift J1913.1+1946: INTEGRAL SPI/ACS observations
  19. ​GRB 221009A: Multi-color detection of the optical
  20. GRB 221009A: Fermi-LAT refined analysis
  21. GRB 221009: Swift/UVOT Detection
  22. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  23. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  24. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  25. GRB 221009A: REM optical and NIR detection of the afterglow
  26. GRB 221009A: Swift-XRT refined Analysis
  27. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  28. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  29. Swift J1913.1+1946 : Pre-discovery limits from ZTF
  30. Swift J1913.1+1946: Optical photometry
  31. Fermi trigger No 687014224: Global MASTER-Net observations report
  32. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  33. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB
  34. Swift GRB221009.59: Global MASTER-Net OT detection
  35. GRB 221008A: Swift-XRT observations
  36. Swift J1913.1+1946 a new bright hard X-ray and optical transient
  37. GRB 221008A: MAXI/GSC detection
  38. GRB 221006A: Swift-XRT observations
  39. GRB 221006A: MAXI/GSC detection
  40. GRB 220930A: MITSuME Akeno optical upper limits
  41. GRB 220912A: Detection by VZLUSAT-2
  42. Fermi trigger No 686588176: Global MASTER-Net observations report
  43. Fermi GBM trigger 686350260/221001869 is not a GRB
  44. GRB 220930A: AbAO Optical Upper Limit
  45. GRB 220930A: Swift-BAT refined analysis
  46. GRB 220930A: Swift-XRT refined Analysis
  47. GRB 220930A: LCOGT Optical Upper Limits
  48. GRB 220930A: Swift/UVOT Upper Limits
  49. GRB 220930A: Enhanced Swift-XRT position
  50. GRB 220930A: COATLI Upper Limits
  51. GRB 220930A: Swift detection of a burst
  52. Fermi-LAT gamma-ray observations of IceCube-220928A
  53. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  54. IPN triangulation of GRB 220927A (long)
  55. GRB 220921A: LCOGT Optical Observations
  56. GRB 220927A: Fermi GBM Final Localization
  57. GRB 220924A: Fermi GBM detection
  58. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  59. Swift Trigger 1125354 (GRB 220926A) is not a GRB
  60. Analysis of long GRB 220926B detected by INTEGRAL
  61. GRB 220926A: Swift detection of a burst
  62. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  63. GRB 220921A: further MeerLICHT observations
  64. GRB 220921A: DDOTI Detection of the Afterglow
  65. GRB 220921A: Fermi GBM detection
  66. GRB 220921A: MeerLICHT afterglow observations
  67. GRB 220921A: Swift-XRT Observations
  68. GRB 220921A: Fermi-LAT detection
  69. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  70. IceCube-220918A: Upper limits from a search for additional neutrino events in IceCube
  71. Fermi trigger No 684894705: Global MASTER-Net observations report
  72. IceCube-220907A: No significant detection in HAWC
  73. GRB 220909A: Fermi GBM observation
  74. GRB 220910A: Fermi GBM observation
  75. GRB 220909A: Swift-XRT observations
  76. IPN triangulation of GRB 220905A
  77. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  78. IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube
  79. GRB 220907A: Swift-BAT refined analysis
  80. IPN triangulation of GRB 220903A (long)
  81. GRB 220907A: Fermi GBM observation
  82. GRB 220907A: Nanshan/NEXT optical upper limits
  83. GRB 220907A: Swift/UVOT Upper Limits
  84. GRB 220907A: Swift-XRT refined Analysis
  85. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  86. GRB 220907A: Swift detection of a burst
  87. Swift GRB220907.59: Global MASTER-Net observations report
  88. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  89. GRB 220831A: DECam detection of a possible optical counterpart
  90. GRB 220831A: Fermi GBM observation
  91. GRB 220831A: Swift-XRT observations
  92. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  93. IceCube-220822A: No significant detection in HAWC
  94. Fermi trigger No 683476673: Global MASTER-Net observations report
  95. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  96. GRB 220826A: Swift-BAT refined analysis
  97. GRB 220826A: Fermi GBM observation
  98. GRB 220826A: Swift-XRT refined Analysis
  99. GRB 220825A: Fermi GBM observation
  100. GRB 220826A: Lesedi optical afterglow detection

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