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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"

39371 results found.

  1. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  4. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  5. GRB 230712B: Fermi GBM Final Localization
  6. GRB 230707A: Swift/BAT-GUANO position correction
  7. GRB 230712A: Fermi GBM Final Real-time Localization
  8. Fermi trigger No 710741042: Global MASTER-Net observations report
  9. GRB 230709C: GRBAlpha detection
  10. GRB 230709B: GRBAlpha detection
  11. GRB 230709C: Fermi GBM Detection
  12. GRB 230709C: Fermi GBM Final Localization
  13. GRB 230707B: Fermi GBM Observation
  14. GRB 230710A: Fermi GBM Final Real-time Localization
  15. GRB 230709C: AstroSat CZTI detection
  16. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  17. GRB 230703A detected with multiple GRID detectors
  18. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  19. Fermi-LAT gamma-ray observations of IceCube-230708A
  20. Fermi-LAT gamma-ray observations of IceCube-230707B
  21. Fermi-LAT gamma-ray observations of IceCube-230707A
  22. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  23. Swift Trigger 1178410: possible GRB 230709A
  24. GRB 230628C: GRID Detection
  25. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  26. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  27. GRB 230707A: Swift-XRT observations
  28. IceCube Alert 230708.35: Global MASTER-Net observations report
  29. GRB 230707B: Fermi GBM Final Real-time Localization
  30. IceCube Alert 230707.71: Global MASTER-Net observations report
  31. GRB 230707A: Fermi GBM Detection
  32. GRB 230707A: Swift ToO observations
  33. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  34. Fermi GRB 230707A: Global MASTER-Net observations report
  35. GRB 230707A: Fermi GBM Final Real-time Localization
  36. Integral GRB230706.70: Global MASTER-Net observations report
  37. IBAS trigger number 10311: not a real GRB
  38. GRB 230625A: Detection by GRID
  39. LIGO/Virgo/KAGRA S230627c: GECKO optical follow-up observations of host galaxy candidates and ZTF23aaptsuy/AT2023lxu
  40. Fermi trigger No 710117592: Global MASTER-Net observations report
  41. GRB 230626A: VZLUSAT-2 detection
  42. GRB 230328B: LBT detection of the likely host galaxy
  43. Konus-Wind detection of GRB 220623A
  44. GRB 230701B: AstroSat CZTI detection
  45. GRB 230628E: Swift/UVOT Detection
  46. GRB 230628E: Swift-BAT refined analysis
  47. GRB 230702A: Fermi GBM Final Real-time Localization
  48. GRB 230628E: ATCA rapid radio follow-up
  49. GRB 230701A: Fermi GBM Final Real-time Localization
  50. LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230701z: one counterpart neutrino candidate from IceCube neutrino searches
  51. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  52. IPN triangulation of GRB 230625B (ultra-long)
  53. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  54. GRB 230628E - VLT spectroscopic observations
  55. Fermi GRB 230628C: Global MASTER-Net observations report
  56. GRB 230625B: AstroSat CZTI detection
  57. GRB230628E: VLT optical identification of afterglow candidate
  58. GRB 230628E: Swift-XRT refined Analysis
  59. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  60. GRB 230628A: Enhanced Swift-XRT position
  61. Fermi GRB 230628D: Global MASTER-Net observations report
  62. GRB 230628E: LCOGT Optical Upper Limit
  63. Swift GRB230628.93: Global MASTER-Net observations report
  64. GRB 230628E: Swift detection of a burst
  65. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  66. GRB 230628D: Fermi GBM Final Real-time Localization
  67. LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230628aj: one counterpart neutrino candidate from IceCube neutrino searches
  68. GRB 230628C: Fermi GBM Final Real-time Localization
  69. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  70. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 230628A: Fermi GBM Final Localization
  72. GRB 230626A: GRBAlpha detection
  73. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  74. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  75. GRB230626A: Fermi GBM Detection
  76. LIGO/Virgo/KAGRA S230627c: Global MASTER-Net observations report
  77. LIGO/Virgo/Kagra S230627c: NED Galaxies in the Localization Volume
  78. Konus-Wind detection of GRB 230616A
  79. LIGO/Virgo/KAGRA S230627c: Zwicky Transient Facility observations and candidates
  80. GRB 230618A: Swift-BAT refined analysis
  81. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  82. GRB 230622A: Swift-BAT refined analysis
  83. GRB 230623A: Swift-XRT observations
  84. GRB 230625A: Fermi GBM Final Real-time Localization
  85. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  86. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  87. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  88. GRB 230623A: Tiled Swift observations
  89. MAXI GRB 230623A: MASTER optical observations
  90. GRB 230623A: Tiled Swift observations
  91. GRB 230622A: ATCA rapid radio follow-up
  92. GRB 230622A: Swift-XRT refined Analysis
  93. GRB 230623A: MAXI/GSC detection
  94. Swift GRB 230622A: Global MASTER-Net observations report
  95. LIGO/Virgo S230622e: Global MASTER-Net observations report
  96. LIGO/Virgo S230621bq: Global MASTER-Net observations report
  97. LIGO/Virgo S230621ad: Global MASTER-Net observations report
  98. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  99. GRB 230622A: Swift detection of a burst
  100. GRB 230621A: Fermi GBM Final Localization Correction

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