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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"

32769 results found.

  1. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  2. GRB 111020A: EVLA observations
  3. GRB 111020A: Swift-XRT refined Analysis
  4. GRB 111020A: Gemini-South i-band observations
  5. GRB 111020A: Swift/UVOT Upper Limits
  6. GRB 111020A: Faulkes Telescope South observations
  7. GRB 111020A: Swift-BAT refined analysis
  8. GRB 111018A: Swift/UVOT Upper Limits
  9. GRB 110918A: Optical light curve for days 1.4 to 16.3
  10. GRB 111018A: Swift-BAT refined analysis
  11. Konus-Wind observation of GRB 111016B
  12. GRB 111018A: Swift-XRT refined Analysis
  13. GRB 111018A: GROND Upper Limits
  14. IPN Triangulation of GRB 111016B (long duration, intense)
  15. GRB111016A : WIYN 3.5m NIR observations
  16. GRB111016A: D50 optical limit
  17. GRB 111016A: Gemini Detection of the NIR Counterpart
  18. GRB 111016A: Swift/UVOT Detection of a Source
  19. GRB 111016A: Swift-BAT refined analysis
  20. GRB 111016A: P60 Afterglow Candidate
  21. GRB 111016A: Swift-XRT refined Analysis
  22. GRB 110921A: optical observations
  23. GRB 111008A : miniTAO/ANIR NIR observations
  24. EVLA 22 GHz Detection of GRB 111008A
  25. GRB 111005A: ATCA 18 GHz decay
  26. GRB 111008A: Swift/UVOT Upper Limits
  27. Konus-Wind observation of GRB 111008A
  28. GRB 111008A: IAC80 I-band observations
  29. GRB 111008A: VLT/X-shooter spectroscopy
  30. GRB 111008A: Swift-XRT refined Analysis
  31. GRB 111008A: Gemini spectroscopic redshift
  32. GRB 111008A, GROND observations
  33. GRB 111008A: NOT optical observation
  34. GRB 111008A: Gemini optical counterpart
  35. GRB 111008A, Swift-BAT refined analysis,
  36. GRB 111005A: ATCA 18 GHz detection
  37. GRB 111005A: ATCA radio upper limit
  38. GRB 111005A : miniTAO/ANIR NIR observations
  39. GRB 111005A: EVLA Observations
  40. GRB 111005A: VLT optical observations
  41. GRB 111005A: GROND NIR observations
  42. GRB 111005A: VLT IR observations
  43. GRB 111005A: Swift-BAT refined analysis
  44. GRB 111005A: bright galaxy in error circle
  45. GRB 110905A / MAXI J1836-194: optical monitoring
  46. Skynet/Dolomiti observations of GRB 110928A
  47. Skynet observations of GRB 110928A
  48. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  49. GRB 110928A: Swift/UVOT Upper Limits
  50. GRB 110928A: Swift-XRT refined Analysis
  51. GRB 110825A: GROND Observations
  52. GRB 110928A: P60 Observations
  53. GRB 110928A: Further PAIRITEL NIR Observations
  54. GRB 110928A: Swift-BAT refined analysis
  55. GRB 110928A: Swift/UVOT finding chart observation
  56. GRB 110928A: PAIRITEL NIR Observations
  57. GRB 110928A: ROTSE-III Optical Limits
  58. Swift-BAT trigger 503926 is noise
  59. GCN for GRB 110921B
  60. GRB 110921A: Swift/UVOT Observations
  61. GRB110918A: Lick Observations
  62. GRB 110921A: NOT observations
  63. GRB 110921A: Fermi GBM observation
  64. GRB 110921A: TNT astrometry
  65. GRB 110921A: Swift-XRT refined Analysis
  66. GRB 110921A, Swift-BAT refined analysis
  67. GRB 110918A: Liverpool Telescope optical observations
  68. GRB 110918A: submm observations from APEX
  69. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  70. GRB 110921A : TNT optical counterpart candidate
  71. GRB 110918A: Swift-XRT refined Analysis
  72. GRB 110918A: Spectroscopy from GTC
  73. GRB 110915B : X-ray afterglow confirmation
  74. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  75. GRB 110918A: rest-frame energetics in gamma-gays
  76. GRB 110918A optical observation
  77. GRB 110918A: Afterglow Confirmation from PTF
  78. GRB 110918A: GROND detection of the afterglow candidate
  79. GRB 110918A: INT optical detection of Swift candidate afterglow
  80. GRB 110918A: Swift-XRT observations
  81. Konus-Wind observation of GRB 110918A
  82. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  83. IPN triangulation of GRB 110918A (long duration, extremely intense)
  84. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  85. GRB 110915A: Swift/UVOT Upper Limits
  86. GRB 110915B: Swift/UVOT Upper Limits
  87. GRB 110915A: GROND Upper limits
  88. GRB 110915A, Swift-BAT refined analysis
  89. GRB 110915A: Swift-XRT refined Analysis
  90. GRB 110915A: Deep Near-IR Limits from Magellan
  91. GRB 110915B: XRT afterglow candidate
  92. GRB 110903A: Suzaku WAM observation of the prompt emission
  93. GRB 110915A: Deep Gemini-South i/z-band imaging
  94. GRB 110915A: NOT observations
  95. GRB 110915A: 1.23m CAHA I-band observations
  96. GRB 110915A: GMG optical upper limit
  97. GRB 110915A: MASTER-Net early limit
  98. GRB 110825A: Further Swift/XRT Observations
  99. GRB 110731A: SAO RAS and Terskol observations
  100. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis

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