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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"

37704 results found.

  1. GRB 240511A: Prompt enhanced Swift-XRT position
  2. GRB 240511A: Swift detection of a burst
  3. GRB 240511A: Fermi GBM Final Real-time Localization
  4. Fermi trigger No 737102480: Global MASTER-Net observations report
  5. Fermi trigger No 737111207: Global MASTER-Net observations report
  6. Fermi Gamma-ray Burst Monitor trigger 737076431/240510977 is not a GRB
  7. Fermi trigger No 736967879: Global MASTER-Net observations report
  8. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  9. EP240506a: CrAO ZTSH optical upper limit
  10. GRB 240504A: Fermi GBM Observation
  11. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  12. Fermi trigger No 736733320: Global MASTER-Net observations report
  13. IPN triangulation of GRB 240504A
  14. GRB 240502A: 1.3m DFOT Optical upper limit
  15. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  16. Fermi GBM triggers 736668287/240506253 and 736669277/240506265 are not GRBs
  17. Fermi trigger No 736564880: Global MASTER-Net observations report
  18. IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
  19. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  20. Fermi trigger No 736461232: Global MASTER-Net observations report
  21. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB
  22. Fermi GRB 240504A: Global MASTER-Net observations report
  23. Fermi trigger No 736472503: Global MASTER-Net observations report
  24. GRB 240503A: AstroSat CZTI detection
  25. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  26. GRB 240504A: Fermi GBM Final Real-time Localization
  27. Fermi trigger No 736387941: Global MASTER-Net observations report
  28. LXT 240402A / GRB 240402B: VLT X-shooter redshift of host
  29. GRB 240502A: GOTO optical upper limit
  30. Fermi trigger No 736379109: Global MASTER-Net observations report
  31. GRB 240502A: Fermi GBM Observation
  32. GRB 240415A 1.3m DFOT Optical upper limit
  33. GRB 240502C: GOTO possible optical counterpart candidates
  34. Fermi GRB 240502B: Global MASTER-Net observations report
  35. GRB 240502C: Fermi GBM Final Localization
  36. Fermi GRB 240502A: Global MASTER-Net observations report
  37. GRB 240501B: GRBAlpha detection
  38. GRB 240430A: GRBAlpha detection
  39. GRB 240502B: Fermi GBM Final Real-time Localization
  40. GRB 240502A long GRB detected by INTEGRAL
  41. GRB 240502A: Fermi GBM Final Real-time Localization
  42. Fermi GRB 240501A: Global MASTER-Net observations report
  43. Fermi trigger No 736197684: Global MASTER-Net observations report
  44. GRB 240426A: VZLUSAT-2 detection
  45. GRB 240425A: VZLUSAT-2 detection
  46. GRB240430A: Fermi GBM Final Localization
  47. GRB 240501B: AstroSat CZTI detection
  48. GRB 240501A: Fermi GBM Final Real-time Localization
  49. GRB 240408B: VZLUSAT-2 detection
  50. GRB 240407A: VZLUSAT-2 detection
  51. X-ray transient EP240414a: Detection of associated supernova
  52. GRB 240425A: GRBAlpha detection
  53. Fermi-LAT gamma-ray observations of IceCube-240424A
  54. GRB 240429A: Fermi GBM Final Real-time Localization
  55. Fermi GRB 240428A: Global MASTER-Net observations report
  56. GRB 240428A: Fermi GBM Final Real-time Localization
  57. GRB 240426A: AstroSat CZTI detection
  58. GRB 240414A: NOEMA detection
  59. LIGO/Virgo/KAGRA S240422ed: Upper limits from GECAM Observations
  60. GRB 240425A: Fermi GBM Final Real-time Localization
  61. Fermi trigger No 735697285: Global MASTER-Net observations report
  62. GRB 240419B: Swift-BAT refined analysis
  63. GRB 240421B: Swift-BAT refined analysis
  64. GRB 240422A: Glowbug gamma-ray detection
  65. IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event
  66. GRB 240421B: GRBAlpha detection
  67. GRB 240419A: Swift-BAT refined analysis
  68. GRB 240418A: Swift-BAT refined analysis
  69. LXT240402A/GRB240402B: Chandra X-ray detection
  70. GRB 240419A: Possible ATCA radio detection
  71. GRB 240421B: ATCA radio observations
  72. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  73. LIGO/Virgo/KAGRA S240422ed: AstroSat CZTI non-detection and upper limits
  74. LIGO/Virgo/KAGRA S240422ed: Upper limits from Fermi-GBM Observations
  75. LIGO/Virgo/KAGRA S240421ar: Upper limits from Swift/BAT-GUANO
  76. Fermi trigger No 735470374: Global MASTER-Net observations report
  77. GRB 240421A: Glowbug gamma-ray detection
  78. GRB 240414A: radio detection with the VLA
  79. Fermi-LAT gamma-ray observations of IceCube-240419A
  80. GRB 240414A: AMI-LA radio observations
  81. GRB 240414A: LBT optical detection
  82. GRB 240419B : MITSuME Akeno optical upper limits
  83. GRB 240415B: Swift-XRT observations
  84. GRB 240415A: Swift-XRT refined Analysis
  85. Fermi GRB 240422A: Global MASTER-Net observations report
  86. GRB 240421B: AstroSat CZTI detection
  87. GRB 240422A: Fermi GBM Final Real-time Localization
  88. GRB240421B: Zadko Observations
  89. Fermi GRB 240421B: Global MASTER-Net observations report
  90. Swift GRB 240421B: Global MASTER-Net observations report
  91. GRB 240421B: Fermi GBM Observation
  92. GRB 240421B: Swift-XRT refined Analysis
  93. GRB240421B: BOOTES-5/JGT optical upper limit
  94. GRB 240421B: J-band upper limits from WINTER
  95. GRB 240421B: Swift/UVOT Upper Limits
  96. GRB 240421B: Enhanced Swift-XRT position
  97. Fermi GRB 240421A: Global MASTER-Net observations report
  98. GRB 240421B: Swift detection of a burst
  99. EP240420a: Nanshan optical counterpart observations
  100. GRB 240421A: Fermi GBM Final Real-time Localization

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