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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"

36192 results found.

  1. GRB 180514A: MITSuME Akeno optical upper limits
  2. GRB 180514A: Detection limits from 2.5m NOT
  3. GRB 180510A: MITSuME Ishigakijima optical upper limits
  4. GRB 180514A: 1.5m OSN optical observations
  5. GRB 180514A: GOTO Optical Observations
  6. GRB 180514A: Swift-BAT refined analysis
  7. GRB 180514A: Swift-XRT refined Analysis
  8. GRB 180514A: Enhanced Swift-XRT position
  9. GRB 180512A: VLT/HAWK-I NIR Observations
  10. GRB 180514A: Swift detection of a burst
  11. Konus-Wind observation of GRB 180510A
  12. GRB 180512A: Swift-XRT refined Analysis
  13. GRB 180512A: Swift-BAT refined analysis
  14. GRB 180512A: RATIR Optical Observations
  15. GRB 180512A: LBT optical detection
  16. GRB 180512A: Swift/UVOT Upper Limits
  17. GRB 180512A: LT prompt observations
  18. GRB 180512A: Enhanced Swift-XRT position
  19. GRB 180512A: GROND upper limits
  20. GRB 180512A: NOT upper limits
  21. GRB 180512A: OASDG optical observations
  22. GRB 180512A: Upper limits from OSN
  23. GRB 180512A: Swift detection of a burst
  24. GRB 180510A: Swift/UVOT followup observations
  25. GRB 180510B: Swift-XRT refined Analysis
  26. GRB 180510A: Swift-XRT refined Analysis
  27. GRB 180510B: Swift-BAT refined analysis
  28. GRB 180510B: VLT/X-shooter observations
  29. GRB 180510B: GROND detection in all bands
  30. GRB 180510B: TAROT La Silla observatory optical observations
  31. Swift Trigger 831888: a possible GRB or Galactic transient
  32. GRB 180510B: Enhanced Swift-XRT position
  33. GRB 180418A: 15 GHz upper limits from AMI
  34. GRB 180510B: Swift detection of a burst with an optical counterpart
  35. GRB 180510A: Swift detection of a burst
  36. GRB 180427A: AstroSat CZTI detection
  37. GRB 180504A: Swift/UVOT Upper Limits
  38. GRB 180504A: Swift-BAT refined analysis
  39. GRB 180505A: Fermi GBM detection
  40. GRB 180416A: AstroSat CZTI detection
  41. GRB 180504A: ePESSTO NTT NIR observations
  42. Correction to Swift-XRT light curve fit for GRB 180504A in GCN 22685
  43. GRB 180504A: Swift-XRT refined Analysis
  44. GRB 180504A: NOT afterglow candidate
  45. GRB 180504A: Prompt enhanced Swift-XRT position
  46. GRB 180504A: Swift detection of a burst
  47. GRB 180416B: AstroSat CZTI detection
  48. Konus-Wind observation of GRB 180427A
  49. IPN Triangulation of GRB 180427A
  50. GRB 180427A: Fermi GBM detection
  51. GRB 180425A: Swift-XRT refined Analysis
  52. GRB 180425A: Swift-BAT refined analysis
  53. GRB 180425A: Swift/UVOT Upper Limits
  54. GRB 180425A: Enhanced Swift-XRT position
  55. GRB 180425A: Swift detection of a burst
  56. GRB 180418A: TAROT La Silla observatory early optical observations
  57. GRB 180418A: MITSuME Ishigakijima Optical Observation
  58. GRB 180418A : SQUEAN observations
  59. Fermi GBM trigger 545979055/180421202 is not a GRB
  60. GRB 180418A: Further GROND observations
  61. GRB 180418A: Swift/UVOT Detection
  62. GRB 180418A: Continued RATIR Optical Observations
  63. GRB 180418A: Imaging of the optical afterglow with the 1.3 m DFOT and 3.6 m DOT in ARIES, India
  64. GRB 180418A GROND observations
  65. GRB 180418A: Xinglong TNT optical upper limit
  66. GRB 180418A: NOT optical observations
  67. GRB 180418A: Gemini-North imaging and spectroscopy
  68. GRB 180418A: Swift-BAT refined analysis
  69. GRB 180418A: 1.5m OSN optical observations
  70. GRB 180418A: Fermi GBM observation
  71. GRB 180418A: Swift-XRT refined Analysis
  72. GRB 180416B: CALET Gamma-Ray Burst Monitor detection
  73. GRB 180418A: RATIR Optical Observations
  74. GRB 180418A: Enhanced Swift-XRT position
  75. GRB 180418A: Swift-XRT observations
  76. GRB 180418A: LCO FTN afterglow confirmation
  77. GRB 180418A: KAIT Optical Afterglow Candidate
  78. GRB 180418A: Swift detection of a short burst
  79. GRB 180404B: AstroSat CZTI detection
  80. GRB 180416A: Fermi GBM detection
  81. GRB 180409A: Swift-XRT afterglow detection
  82. GRB 180411A: CALET Gamma-Ray Burst Monitor detection
  83. GRB 180411B: CALET Gamma-Ray Burst Monitor detection
  84. Konus-Wind observation of GRB 180411A
  85. GRB 180411A: Swift/UVOT Upper Limit
  86. GRB 180411A: Tautenburg observations
  87. GRB 180410A: Fermi GBM observation
  88. GRB 180409A CALET Gamma-Ray Burst Monitor detection
  89. GRB 180411A: Fermi GBM detection
  90. GRB 180411A: Swift-BAT refined analysis
  91. GRB 180411A: Swift-XRT refined Analysis
  92. GRB 180410A: RATIR Optical Observations
  93. GRB 180411A: Swift detection of a burst
  94. GRB 180410A: Swift-XRT refined Analysis
  95. GRB 180410A: Swift-BAT refined analysis
  96. GRB 180410A: Swift/UVOT Upper Limits
  97. GRB 180409A: Fermi GBM observation
  98. GRB 180409A: Swift-XRT observations
  99. Konus-Wind observation of GRB 180404C
  100. GRB 180410A: MITSuME Akeno optical upper limits

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