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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"

37583 results found.

  1. GRB 151027B: Swift-BAT refined analysis
  2. GRB 151027A: continued GMG observation
  3. GRB 151027B: RATIR Observations
  4. GRB 151027B: MASTER-NET early OT detection
  5. GRB 151027A: LCOGT-McDonald afterglow observations
  6. GRB 151027B: Swift-XRT refined Analysis
  7. GRB 151027A: VLA detection
  8. GRB 151027B: GROND Optical/NIR Afterglow Detection
  9. GRB 151027B: VLT/X-shooter redshift
  10. GRB 151027B: Enhanced Swift-XRT position
  11. GRB 151027A: THO optical observations
  12. GRB 151027A: UVOT Observations
  13. GRB 151027B: NOT optical afterglow candidate
  14. GRB 151027B: Swift detection of its 1000-th burst
  15. GRB 151027A: Swift-BAT refined analysis
  16. GRB 151027A: Early RAPTOR Observations
  17. GRB 151027A: GMG observation
  18. GRB 151027A: Fermi GBM observation
  19. GRB 151027A: MITSuME Akeno Optical observation
  20. GRB 151027A: Swift-XRT refined Analysis
  21. GRB 151027A: Keck/HIRES redshift
  22. LIGO/Virgo G194575: GROND multi-color observations
  23. GRB 151027A: Weihai optical observations
  24. Tentative redshift for GRB 151027A from Swift-XRT data
  25. GRB 151027A: Enhanced Swift-XRT position
  26. GRB 151027A: P60 afterglow confirmation and rebrightening
  27. GRB 151027A : ISON-NM early optical detection
  28. GRB 151027A: KAIT optical afterglow confirmation
  29. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  30. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  31. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  32. GRB 151023A: Swift-BAT refined analysis
  33. LIGO/Virgo G194575: Pi of the Sky observations
  34. GRB 151022A: OSN optical upper limit
  35. GRB 151023A: RATIR Observations
  36. GRB 151023A: Swift-XRT refined Analysis
  37. GRB 151023A: Swift/UVOT Upper Limits
  38. GRB 151023A
  39. GRB 151023A: Enhanced Swift-XRT position
  40. Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575
  41. GRB 151022A: Swift/UVOT Upper Limits
  42. LIGO/Virgo G194575: INTEGRAL search of temporally coincident prompt hard X-ray emission
  43. GRB 151022A: Swift-BAT refined analysis
  44. GRB 151023A: Swift detection of a burst
  45. GRB 151022A: RATIR Upper Limits
  46. GRB 151022A: Swift-XRT refined Analysis
  47. LIGO/Virgo G194575: Fermi GBM Observations
  48. GRB 151022A: MITSuME Okayama upper limits
  49. GRB 151022A: Enhanced Swift-XRT position
  50. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  51. GRB 151022A: Mondy optical upper limit
  52. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  53. GRB 151022A: Kanata/HOWPol optical observation
  54. GRB 151022A: Prompt enhanced Swift-XRT position
  55. GRB 151022A: MASTER-Ural observations
  56. GRB 151022A: Swift detection of a burst
  57. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  58. GRB 151021B: Fermi GBM detection
  59. Konus-Wind observation of GRB 151021A
  60. GRB 151021A: Swift/UVOT Detection
  61. GRB 151021A: MITSuME Okayama upper limits
  62. GRB 151021A: Swift-XRT refined Analysis
  63. GRB 151021A: Swift-BAT refined analysis
  64. GRB 151021A: Enhanced Swift-XRT position
  65. GRB 151021A: MASTER-NET bright OT detection
  66. GRB 151021A: Optical counterpart and redshift from X-shooter
  67. GRB 151021A: Swift detection of a burst
  68. GRB 151004A: Swift-XRT follow-up observations
  69. GRB 151006A: Astrosat CZTI detection
  70. Fermi GBM trigger 466602792/151015495 is not a GRB
  71. Fermi GBM trigger 466316973/151012187 is not a GRB
  72. GRB 151006A: Mondy optical upper limit
  73. GRB 151006A: MITSuME Akeno optical upper limits
  74. Fermi GBM trigger 466059859/151009211 is not a GRB
  75. Konus-Wind observation of GRB 151006A
  76. Swift Trigger 658045 is not a GRB
  77. GRB 151006A: OSN optical upper limit
  78. GRB 151006A: Swift-BAT refined analysis
  79. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  80. GRB 151006A: Swift-XRT refined Analysis
  81. GRB 151006A: Fermi-LAT detection
  82. GRB 151006A: Swift/UVOT Upper Limits
  83. GRB 151006A: Fermi GBM detection
  84. GRB 151006A: Enhanced Swift-XRT position
  85. GRB 151006A: MITSuME Okayama upper limits
  86. Konus-Wind observation of GRB 151001B
  87. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  88. GRB 151006A: Prompt enhanced Swift-XRT position
  89. GRB 151006A: Swift detection of a burst
  90. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  91. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  92. Swift Trigger 657564: MASTER-NET early optical observations.
  93. Swift Trigger 657564: XRT prompt analysis
  94. Swift Trigger 657564: a probable GRB
  95. GRB 151001A: Swift-BAT refined analysis
  96. GRB 151001A: RATIR Observations
  97. GRB 151001B: Swift/UVOT Upper Limits
  98. GRB 151001B: Swift-XRT refined Analysis
  99. GRB 151001B: Swift-BAT refined analysis
  100. GRB 151001A: Swift/UVOT Detection

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