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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"

37612 results found.

  1. GRB 151030A: Fermi GBM observation
  2. GRB 151031A: Swift-XRT refined Analysis
  3. GRB 151027B: RATIR Late-Time Upper Limits
  4. GRB 151031A: Swift-BAT refined analysis
  5. GRB 151031A: Enhanced Swift-XRT position
  6. GRB 151031A: VLT/X-shooter optical counterpart and redshift
  7. GRB 151027A: optical follow-up observations
  8. GRB 151031A: Swift detection of a burst
  9. GRB 151027A: Continued P60 Monitoring
  10. Correction to the Trigger Time for Swift GRB 151029A
  11. GRB 151029A: MITSuME Ishigakijima upper limits
  12. GRB 151027A: Optical counterpart detection
  13. GRB 151029A: Swift-XRT refined Analysis
  14. GRB 151029A: Swift/UVOT Detection
  15. GRB 151029A: LCOGT-FTS afterglow observations
  16. GRB 151027B: Swift UVOT detection
  17. GRB 151029A: Swift-BAT refined analysis
  18. GRB 151029A: Enhanced Swift-XRT position
  19. GRB 151027A: MAXI/GSC detection
  20. GRB 151029A VLT/X-shooter redshift
  21. GRB 151029A: GROND afterglow observations
  22. GRB 151029A: Swift detection of a burst with an optical counterpart
  23. GRB 151027A: SAO RAS optical observations
  24. GRB 151027B: LCOGT FTN afterglow observations
  25. GRB 151027A: NOT optical and NIR observations
  26. GRB 151027A: T100 observations
  27. GRB 151027B: Swift/UVOT Upper Limits
  28. Konus-Wind observation of GRB 151027A
  29. GRB 151027A : Xinglong TNT optical observation
  30. GRB 151027B: Swift-BAT refined analysis
  31. GRB 151027A: continued GMG observation
  32. GRB 151027B: RATIR Observations
  33. GRB 151027B: MASTER-NET early OT detection
  34. GRB 151027A: LCOGT-McDonald afterglow observations
  35. GRB 151027B: Swift-XRT refined Analysis
  36. GRB 151027A: VLA detection
  37. GRB 151027B: GROND Optical/NIR Afterglow Detection
  38. GRB 151027B: VLT/X-shooter redshift
  39. GRB 151027B: Enhanced Swift-XRT position
  40. GRB 151027A: THO optical observations
  41. GRB 151027A: UVOT Observations
  42. GRB 151027B: NOT optical afterglow candidate
  43. GRB 151027B: Swift detection of its 1000-th burst
  44. GRB 151027A: Swift-BAT refined analysis
  45. GRB 151027A: Early RAPTOR Observations
  46. GRB 151027A: GMG observation
  47. GRB 151027A: Fermi GBM observation
  48. GRB 151027A: MITSuME Akeno Optical observation
  49. GRB 151027A: Swift-XRT refined Analysis
  50. GRB 151027A: Keck/HIRES redshift
  51. LIGO/Virgo G194575: GROND multi-color observations
  52. GRB 151027A: Weihai optical observations
  53. Tentative redshift for GRB 151027A from Swift-XRT data
  54. GRB 151027A: Enhanced Swift-XRT position
  55. GRB 151027A: P60 afterglow confirmation and rebrightening
  56. GRB 151027A : ISON-NM early optical detection
  57. GRB 151027A: KAIT optical afterglow confirmation
  58. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  59. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  60. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  61. GRB 151023A: Swift-BAT refined analysis
  62. LIGO/Virgo G194575: Pi of the Sky observations
  63. GRB 151022A: OSN optical upper limit
  64. GRB 151023A: RATIR Observations
  65. GRB 151023A: Swift-XRT refined Analysis
  66. GRB 151023A: Swift/UVOT Upper Limits
  67. GRB 151023A
  68. GRB 151023A: Enhanced Swift-XRT position
  69. Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575
  70. GRB 151022A: Swift/UVOT Upper Limits
  71. LIGO/Virgo G194575: INTEGRAL search of temporally coincident prompt hard X-ray emission
  72. GRB 151022A: Swift-BAT refined analysis
  73. GRB 151023A: Swift detection of a burst
  74. GRB 151022A: RATIR Upper Limits
  75. GRB 151022A: Swift-XRT refined Analysis
  76. LIGO/Virgo G194575: Fermi GBM Observations
  77. GRB 151022A: MITSuME Okayama upper limits
  78. GRB 151022A: Enhanced Swift-XRT position
  79. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  80. GRB 151022A: Mondy optical upper limit
  81. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  82. GRB 151022A: Kanata/HOWPol optical observation
  83. GRB 151022A: Prompt enhanced Swift-XRT position
  84. GRB 151022A: MASTER-Ural observations
  85. GRB 151022A: Swift detection of a burst
  86. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  87. GRB 151021B: Fermi GBM detection
  88. Konus-Wind observation of GRB 151021A
  89. GRB 151021A: Swift/UVOT Detection
  90. GRB 151021A: MITSuME Okayama upper limits
  91. GRB 151021A: Swift-XRT refined Analysis
  92. GRB 151021A: Swift-BAT refined analysis
  93. GRB 151021A: Enhanced Swift-XRT position
  94. GRB 151021A: MASTER-NET bright OT detection
  95. GRB 151021A: Optical counterpart and redshift from X-shooter
  96. GRB 151021A: Swift detection of a burst
  97. GRB 151004A: Swift-XRT follow-up observations
  98. GRB 151006A: Astrosat CZTI detection
  99. Fermi GBM trigger 466602792/151015495 is not a GRB
  100. Fermi GBM trigger 466316973/151012187 is not a GRB

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