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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"

39368 results found.

  1. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  2. GRB 230712B: Fermi GBM Final Localization
  3. GRB 230707A: Swift/BAT-GUANO position correction
  4. GRB 230712A: Fermi GBM Final Real-time Localization
  5. Fermi trigger No 710741042: Global MASTER-Net observations report
  6. GRB 230709C: GRBAlpha detection
  7. GRB 230709B: GRBAlpha detection
  8. GRB 230709C: Fermi GBM Detection
  9. GRB 230709C: Fermi GBM Final Localization
  10. GRB 230707B: Fermi GBM Observation
  11. GRB 230710A: Fermi GBM Final Real-time Localization
  12. GRB 230709C: AstroSat CZTI detection
  13. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  14. GRB 230703A detected with multiple GRID detectors
  15. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  16. Fermi-LAT gamma-ray observations of IceCube-230708A
  17. Fermi-LAT gamma-ray observations of IceCube-230707B
  18. Fermi-LAT gamma-ray observations of IceCube-230707A
  19. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  20. Swift Trigger 1178410: possible GRB 230709A
  21. GRB 230628C: GRID Detection
  22. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  23. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  24. GRB 230707A: Swift-XRT observations
  25. IceCube Alert 230708.35: Global MASTER-Net observations report
  26. GRB 230707B: Fermi GBM Final Real-time Localization
  27. IceCube Alert 230707.71: Global MASTER-Net observations report
  28. GRB 230707A: Fermi GBM Detection
  29. GRB 230707A: Swift ToO observations
  30. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  31. Fermi GRB 230707A: Global MASTER-Net observations report
  32. GRB 230707A: Fermi GBM Final Real-time Localization
  33. Integral GRB230706.70: Global MASTER-Net observations report
  34. IBAS trigger number 10311: not a real GRB
  35. GRB 230625A: Detection by GRID
  36. LIGO/Virgo/KAGRA S230627c: GECKO optical follow-up observations of host galaxy candidates and ZTF23aaptsuy/AT2023lxu
  37. Fermi trigger No 710117592: Global MASTER-Net observations report
  38. GRB 230626A: VZLUSAT-2 detection
  39. GRB 230328B: LBT detection of the likely host galaxy
  40. Konus-Wind detection of GRB 220623A
  41. GRB 230701B: AstroSat CZTI detection
  42. GRB 230628E: Swift/UVOT Detection
  43. GRB 230628E: Swift-BAT refined analysis
  44. GRB 230702A: Fermi GBM Final Real-time Localization
  45. GRB 230628E: ATCA rapid radio follow-up
  46. GRB 230701A: Fermi GBM Final Real-time Localization
  47. LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230701z: one counterpart neutrino candidate from IceCube neutrino searches
  48. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  49. IPN triangulation of GRB 230625B (ultra-long)
  50. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  51. GRB 230628E - VLT spectroscopic observations
  52. Fermi GRB 230628C: Global MASTER-Net observations report
  53. GRB 230625B: AstroSat CZTI detection
  54. GRB230628E: VLT optical identification of afterglow candidate
  55. GRB 230628E: Swift-XRT refined Analysis
  56. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  57. GRB 230628A: Enhanced Swift-XRT position
  58. Fermi GRB 230628D: Global MASTER-Net observations report
  59. GRB 230628E: LCOGT Optical Upper Limit
  60. Swift GRB230628.93: Global MASTER-Net observations report
  61. GRB 230628E: Swift detection of a burst
  62. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  63. GRB 230628D: Fermi GBM Final Real-time Localization
  64. LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230628aj: one counterpart neutrino candidate from IceCube neutrino searches
  65. GRB 230628C: Fermi GBM Final Real-time Localization
  66. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  67. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  68. GRB 230628A: Fermi GBM Final Localization
  69. GRB 230626A: GRBAlpha detection
  70. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  71. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  72. GRB230626A: Fermi GBM Detection
  73. LIGO/Virgo/KAGRA S230627c: Global MASTER-Net observations report
  74. LIGO/Virgo/Kagra S230627c: NED Galaxies in the Localization Volume
  75. Konus-Wind detection of GRB 230616A
  76. LIGO/Virgo/KAGRA S230627c: Zwicky Transient Facility observations and candidates
  77. GRB 230618A: Swift-BAT refined analysis
  78. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  79. GRB 230622A: Swift-BAT refined analysis
  80. GRB 230623A: Swift-XRT observations
  81. GRB 230625A: Fermi GBM Final Real-time Localization
  82. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  83. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  84. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  85. GRB 230623A: Tiled Swift observations
  86. MAXI GRB 230623A: MASTER optical observations
  87. GRB 230623A: Tiled Swift observations
  88. GRB 230622A: ATCA rapid radio follow-up
  89. GRB 230622A: Swift-XRT refined Analysis
  90. GRB 230623A: MAXI/GSC detection
  91. Swift GRB 230622A: Global MASTER-Net observations report
  92. LIGO/Virgo S230622e: Global MASTER-Net observations report
  93. LIGO/Virgo S230621bq: Global MASTER-Net observations report
  94. LIGO/Virgo S230621ad: Global MASTER-Net observations report
  95. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  96. GRB 230622A: Swift detection of a burst
  97. GRB 230621A: Fermi GBM Final Localization Correction
  98. Fermi trigger No 709083929: Global MASTER-Net observations report
  99. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  100. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations

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