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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19605 results found.

  1. GRB 231118A: AstroSat CZTI detection
  2. GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor
  3. GRB 231118A: Las Cumbres optical detection
  4. GRB 231118A: LCOGT Optical Observations
  5. GRB 231118A: MASTER OT observation
  6. Swift GRB231118.72: Global MASTER-Net observations report
  7. GRB 231118A: Enhanced Swift-XRT position
  8. GRB 231117A: Kinder observations with Lulin observatory for AT 2023yba without fading in r band
  9. GRB 231118A: Swift-XRT position
  10. GRB 231118A: Skynet Optical Afterglow Discovery
  11. GRB 231118A: Swift detection of a burst
  12. GRB 231117A: GRBAlpha detection
  13. GRB 231117A: GIT optical follow-up
  14. GRB 231117A: AKO Optical Upper Limit
  15. GRB 231117A: afterglow candidate detection from Kinder observations with Lulin observatory
  16. Swift GRB 231117A: Global MASTER-Net observations report
  17. GRB 231117A (short): Glowbug gamma-ray detection
  18. GRB 231117A: ATLAS non-detection of an optical counterpart
  19. Konus-Wind detection of GRB 231117A (short/hard)
  20. GRB 231115A: optical observations from INAF observatories
  21. GRB 231117A : MITSuME Akeno optical upper limits
  22. GRB 231117A: AGILE detection of a bright short burst
  23. GRB 231117A: Enhanced Swift-XRT position
  24. GRB 231117A: GOTO optical upper limits
  25. GRB 231117A: AstroSat CZTI detection of a bright short burst
  26. GRB 231117A: Swift detection of a bright short burst
  27. GRB 231111A: Swift/UVOT Detection
  28. GRB 231115A: Swift/BAT-GUANO detection of a short burst
  29. GRB 231115A: Swift-XRT and Swift-UVOT observations
  30. GRB 231115A: Swift ToO observations
  31. GRB 231111A: Swift-BAT refined analysis
  32. GECAM-B observation of a short burst from SGR J1555-5402
  33. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  34. GRB 231110A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 231110A: Swift-BAT refined analysis
  36. GRB231111A: MDM 2.4m Hiltner Telescope Observation
  37. GRB 231111A: Xinglong-2.16m optical observations
  38. GRB 231110A: Swift-UVOT Upper Limits
  39. GRB 231104A: VZLUSAT-2 detection
  40. GRB 231110A: Glowbug gamma-ray detection
  41. GRB 231110A: AstroSat CZTI detection
  42. GRB 231111A: Leavitt Observatory optical observations
  43. GRB231111A: Optical follow-up observations with Mephisto
  44. GRB 231111A: Osservatorio Astronomico "Nastro Verde" optical observations with detection of an optical counterpart
  45. GRB 231110A: Terskol Zeiss-2000 optical upper limit
  46. GRB 231111A: Swift-XRT refined Analysis
  47. GRB 231111A: Mondy optical observations
  48. GRB 231111A: GECAM-C detection of a long burst (correction)
  49. GRB 231110A: GECAM-B detection (correction)
  50. GRB 231111A: Enhanced Swift-XRT position
  51. GRB 231111A: GECAM-C detection of a long burst
  52. GRB 231110A: GECAM detection
  53. GRB 231110A: SAO RAS optical observations
  54. GRB 231110A: Swift-XRT afterglow detection
  55. GRB231111A: YAHPT Observations
  56. GRB231111A: GIT confirmation of the optical afterglow
  57. GRB 231111A: MASTER OT earlier detection
  58. GRB 231111A: Nanshan/HMT optical observations
  59. GRB 231111A: Swift detection of a burst with an optical counterpart
  60. Swift GRB231111.60: Global MASTER-Net observations report
  61. GRB231110A: WFST Observation and upper limits
  62. Swift GRB231110.89: Global MASTER-Net observations report
  63. GRB 231110A: Swift detection of a burst
  64. GRB 231104A: Swift-BAT refined analysis
  65. GRB 231104A: FRAM-ORM optical limit
  66. LIGO/Virgo/KAGRA S231102w: Upper limits from Swift/BAT-GUANO
  67. GRB 231104A: NuSTAR Observation of the prompt emission
  68. GRB 231104A: 3.6m DOT optical upper limit
  69. GRB 231104A: NOT upper limit
  70. GRB 231104A: Fermi GBM Observation
  71. GRB 231104A: AKO Upper Limit
  72. GRB 231104A: AstroSat CZTI detection
  73. GRB 231104A: Swift-XRT refined Analysis
  74. GRB 231104A: Fermi-LAT detection
  75. GRB 231104A: Swift/UVOT Upper Limits
  76. GRB 231104A: Enhanced Swift-XRT position
  77. GRB231104A: LCOGT Optical Upper Limits
  78. GRB 231104A: Swift detection of a bright burst
  79. Swift GRB231104.07: Global MASTER-Net observations report
  80. New Swift-BAT/GUANO and IceCube Notices Available via GCN Kafka
  81. IPN triangulation of GRB 231020A
  82. GRB 231028A: Swift-BAT refined analysis
  83. LIGO/Virgo/KAGRA S231029y: Upper limits from Swift/BAT-GUANO
  84. GRB 231028A: CALET Gamma-Ray Burst Monitor detection
  85. GRB 231028A: AstroSat CZTI detection
  86. GRB 231028A: Glowbug gamma-ray detection
  87. GRB 231028A: Fermi GBM Detection
  88. Swift GRB 231028A: Global MASTER-Net observations report
  89. GRB 231028A: Swift detection of a burst
  90. GRB 231025A: Fermi GBM Observation
  91. GRB 231025A: Swift/BAT-GUANO detection of a likely short burst
  92. GRB 231018A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  93. LIGO/Virgo/KAGRA S231020bw: Upper limits from Swift/BAT-GUANO
  94. GRB 231017A: Mondy optical observations. A possible candidate for an afterglow or host galaxy.
  95. GRB 231017A: 1.3m DFOT Optical upper limit
  96. GRB 231018A: Glowbug gamma-ray detection
  97. IPN triangulation of GRB 231018A
  98. GRB 231017A: Swift/UVOT Upper Limit
  99. GRB 230911C: ATCA detection of possible radio counterpart
  100. GRB 231017A: GOTO optical upper limits

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