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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"

39404 results found.

  1. GRB 221009A: MeerKAT detection
  2. GRB 221009A: Lowell Discovery Telescope Afterglow Detection
  3. GRB221009A: LCOGT Continued Observations - Optical Upper Limits
  4. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  5. GRB 221009A/Swift J1913.1+1946: low-frequency ASKAP observations
  6. Fermi trigger No 687345829: Global MASTER-Net observations report
  7. Fermi trigger No 687344475: Global MASTER-Net observations report
  8. Fermi trigger No 687340841: Global MASTER-Net observations report
  9. Fermi trigger No 687337536: Global MASTER-Net observations report
  10. GRB 221006A: Swift-XRT afterglow detection
  11. GRB 221009A: MITSuME Okayama optical observation
  12. GRB 221009A: Sayan observatory 1.6-m telescope observations
  13. Fermi trigger No 687281393: Global MASTER-Net observations report
  14. GRB 221009A: GMG observation
  15. GRB 221013B: Fermi GBM Final Real-time Localization
  16. Integral GRB221013.04: Global MASTER-Net observations report
  17. GRB 221013A: Fermi GBM Final Real-time Localization
  18. Integral GRB221013.00: Global MASTER-Net observations report
  19. Integral GRB221012.99: Global MASTER-Net observations report
  20. Integral GRB221012.94: Global MASTER-Net observations report
  21. Integral GRB221012.91: Global MASTER-Net observations report
  22. Integral GRB221012.88: Global MASTER-Net observations report
  23. Integral GRB221012.87: Global MASTER-Net observations report
  24. Integral GRB221012.77: Global MASTER-Net observations report
  25. Integral GRB221012.74: Global MASTER-Net observations report
  26. Integral GRB221012.72: Global MASTER-Net observations report
  27. Integral GRB221012.71: Global MASTER-Net observations report
  28. Integral GRB221012.68: Global MASTER-Net observations report
  29. Integral GRB221012.68: Global MASTER-Net observations report
  30. Integral GRB221012.98: Global MASTER-Net observations report
  31. Afterglow limits of GRB 221006A from OHP
  32. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  33. GRB 221009A/Swift J1913.1+1946: SMA observations
  34. GRB 221009A: COATLI Continued Monitoring of the Afterglow
  35. Integral GRB221012.63: Global MASTER-Net observations report
  36. Integral GRB221012.61: Global MASTER-Net observations report
  37. Integral GRB221012.60: Global MASTER-Net observations report
  38. Integral GRB221012.53: Global MASTER-Net observations report
  39. GRB 221009A/Swift J1913.1+1946: eMERLIN observations
  40. Fermi trigger No 687205006: Global MASTER-Net observations report
  41. GRB 220829A: Detection by GRBAlpha
  42. GRB 220826B: Detection by GRBAlpha
  43. GRB 221009A: NuSTAR Detection
  44. GRB 221009A: NICER follow-up observations
  45. GRB 221009A: LCOGT Optical Afterglow Detection
  46. GRB 221009A: COATLI Detection of the Afterglow
  47. GRB 221009A: planned observation with the Imaging X-ray Polarimetry Explorer (IXPE)
  48. Fermi trigger No 687190301: Global MASTER-Net observations report
  49. GRB 221009A (Swift J1913.1+1946): Swift-BAT refined analysis
  50. Fermi Gamma-ray Burst Monitor trigger 221011452/687178284 is not a GRB
  51. GRB 221009A: 10.4m GTC spectroscopic redshift confirmation
  52. GRB 221009A: Detection by GRBAlpha
  53. GRB 221009A: Sintez-Newton/CrAO optical observations
  54. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  55. GRB 221006A: Swift ToO observations
  56. GRB 221011A: Fermi GBM Final Real-time Localization
  57. Swift/XRT discovery of multiple dust-scattering X-ray rings around GRB 221009A
  58. GRB 221009A (Swift J1913.1+1946): iTelescope optical observation
  59. GRB 221009A: BlackGEM optical observations
  60. LHAASO observed GRB 221009A with more than 5000 VHE photons up to around 18 TeV
  61. GRB 221009A: NOEMA mm detection
  62. GRB 221006A: CALET Gamma-Ray Burst Monitor detection
  63. Integral GRB221010.89: Global MASTER-Net observations report
  64. Fermi trigger No 687077239: Global MASTER-Net observations report
  65. GRB 221009A: Continued Swift/XRT observations
  66. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  67. GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
  68. Konus-Wind detection of GRB 221009A
  69. GRB 221009A: Lulin SLT-40cm optical observations
  70. Swift J1913.1+1946: New Photometry
  71. GRB 221009A: Upper limits from a neutrino search with IceCube
  72. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  73. GRB221009A/Swift J1913.1+1946: SRG/ART-XC observation
  74. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  75. GRB221009A/Swift J1913.1+1946: Solar Orbiter STIX measurements
  76. GRB221009A/Swift J1913.1+1946: INTEGRAL SPI/ACS observations
  77. ​GRB 221009A: Multi-color detection of the optical
  78. GRB 221009A: Fermi-LAT refined analysis
  79. GRB 221009A (Swift J1913.1+1946): AGILE/GRID detection
  80. GRB 221009: Swift/UVOT Detection
  81. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  82. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  83. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  84. GRB 221009A: REM optical and NIR detection of the afterglow
  85. GRB 221009A: Swift-XRT refined Analysis
  86. GRB 221009A (Swift J1913.1+1946): AGILE/MCAL detection
  87. GRB 221009A: Redshift from X-shooter/VLT
  88. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  89. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  90. GRB 221009A (Swift J1913.1+1946): Mondy optical observations
  91. GRB 221009A BOOTES-2/TELMA and OSN optical detections
  92. GRB 221009A: Fermi GBM observation
  93. IPN triangulation of extremely bright GRB 221009A
  94. Swift J1913.1+1946: Optical photometry
  95. Fermi trigger No 687014224: Global MASTER-Net observations report
  96. Swift J1913.1+1946: Liverpool Telescope imaging and spectroscopy
  97. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  98. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB
  99. GRB 221009A: Swift detected transient may be GRB
  100. Swift GRB221009.59: Global MASTER-Net OT detection

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