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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"

22194 results found.

  1. GRB240122A: PRIME near infrared detection
  2. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  3. Fermi-LAT gamma-ray observations of IceCube-240123A
  4. GRB 240123A: further SAO RAS optical observations
  5. IceCube Alert 240123.48: Global MASTER-Net observations report
  6. GRB 240123A: Mondy continued optical observations and the PL decay index
  7. GRB 240123A: SAO RAS optical observations
  8. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  9. Fermi GRB 240123B: Global MASTER-Net observations report
  10. GRB 240122A: Swift/UVOT Upper Limits
  11. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  12. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  13. GRB 240118A: Swift/UVOT Upper Limits
  14. GRB 240123A: Mondy optical afterglow observations
  15. Swift GRB240123.46: Global MASTER-Net observations report
  16. GRB 240122A: Swift-XRT afterglow detection
  17. GRB 240122A: VLT/X-shooter redshift confirmation
  18. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  19. GRB 240122A: GOTO optical counterpart candidate
  20. GRB 240122A: Tiled Swift observations
  21. GRB 240118A: Mondy optical observations
  22. GRB 240118A: Swift-XRT afterglow detection
  23. Fermi GRB 240119A: Global MASTER-Net observations report
  24. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  25. GRB 240118C: Swift/BAT-GUANO detection of a burst
  26. GRB 240118A: Swift ToO observations
  27. Fermi GRB 240118B: Global MASTER-Net observations report
  28. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  29. Konus-Wind detection of GRB 240118A
  30. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A
  31. LAT GRB240118.08: Global MASTER-Net observations report
  32. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  33. Swift Triggers 1209369 and 1209370 are not astrophysical events
  34. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  35. Integral GRB240115.70: Global MASTER-Net observations report
  36. Fermi GRB 240115B: Global MASTER-Net observations report
  37. Fermi GRB 240115A: Global MASTER-Net observations report
  38. GRB 240112C: Swift/UVOT Detection
  39. Fermi trigger No 726773850: Global MASTER-Net observations report
  40. GRB 240112C: SAO RAS optical observations
  41. Fermi GRB 240112D: Global MASTER-Net observations report
  42. Fermi trigger No 726774492: Global MASTER-Net observations report
  43. Swift GRB 240112C: Global MASTER-Net observations report
  44. Fermi GRB 240112B: Global MASTER-Net observations report
  45. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  46. GRB 231214A: ATCA Radio Upper Limits
  47. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  48. GRB 231215A: radio detection with the VLA
  49. GRB 230818A: further radio observations with the VLA
  50. GRB 230812B: further radio observations with the VLA
  51. Swift GRB240109.17: Global MASTER-Net observations report
  52. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  53. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  54. Fermi trigger No 726347794: Global MASTER-Net observations report
  55. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  56. Fermi trigger No 726194053: Global MASTER-Net observations report
  57. IceCube Alert 240105.52: Global MASTER-Net observations report
  58. GRB 240101A: 1.3m DFOT optical observations
  59. GRB 240102A: 1.3m DFOT optical upper limit
  60. GRB 240101B: 1.3m DFOT optical upper limit
  61. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  62. GRB 231220A: Swift-UVOT upper limit
  63. GRB 240102A: Swift/UVOT Upper Limits
  64. Fermi trigger No 725857207: Global MASTER-Net observations report
  65. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  66. GRB 240101A: Terskol Zeiss-2000 optical observations
  67. GRB 240101B: Swift/UVOT Upper Limits
  68. GRB 240101A: Swift/UVOT Upper Limits
  69. Swift GRB240101.85: Global MASTER-Net observations report
  70. Fermi trigger No 725806648: Global MASTER-Net observations report
  71. GRB 231230A: GOTO optical upper limits
  72. GRB 231230A: Swift/UVOT Upper Limits
  73. GRB 231230A: NOT optical upper limits
  74. Fermi trigger No 725592555: Global MASTER-Net observations report
  75. Swift GRB231230.06: Global MASTER-Net observations report
  76. LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO
  77. Fermi trigger No 725143760: Global MASTER-Net observations report
  78. GRB 231222B: Swift-XRT afterglow detection
  79. LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate
  80. Fermi trigger No 724921799: Global MASTER-Net observations report
  81. LAT GRB231222.31: Global MASTER-Net observations report
  82. GRB 231222A: Tiled Swift observations
  83. IceCube-231211A: GRANDMA observations of PKS2047+098
  84. GRB 231220A: Swift-XRT follow-up observations
  85. GRB 231220A: Swift ToO observations
  86. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  87. Fermi trigger No 724781422: Global MASTER-Net observations report
  88. GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position
  89. Fermi trigger No 724698747: Global MASTER-Net observations report
  90. GRB 231216A: GAD Observatory, La Spezia, Italy upper limit
  91. GRB 231216A: optical upper limits from the INAF Asiago Observatory
  92. GRB 231215A: AMI-LA radio detection
  93. GRB 231216A: Nanshan/HMT optical upper limit
  94. GRB 231216A: Osservatorio Astronomico Nastro Verde upper limit
  95. GRB 231215A: Osservatorio Astronomico Nastro Verde upper limit
  96. GRB 231216A: REM NIR upper limits
  97. GRB 231216A: Swift/UVOT Upper Limits
  98. GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence
  99. GRB 231216A: GIT optical upper limit
  100. GRB 231216A: NOT optical upper limits

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