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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"

37766 results found.

  1. GRB 111016A: Gemini Detection of the NIR Counterpart
  2. GRB 111016A: Swift/UVOT Detection of a Source
  3. GRB 111016A: Swift-BAT refined analysis
  4. GRB 111016A: P60 Afterglow Candidate
  5. GRB 111016A: MITSuME Akeno Optical upper limits
  6. GRB 111016A: Swift-XRT refined Analysis
  7. GRB 111016A: Enhanced Swift-XRT position
  8. GRB 111016A: Swift-XRT observations
  9. GRB 111016A: Swift detection of a burst
  10. GRB 110921A: optical observations
  11. GRB 111008A : miniTAO/ANIR NIR observations
  12. EVLA 22 GHz Detection of GRB 111008A
  13. GRB 111005A: ATCA 18 GHz decay
  14. GRB 111008A: Swift/UVOT Upper Limits
  15. Konus-Wind observation of GRB 111008A
  16. GRB 111008A: IAC80 I-band observations
  17. GRB 111008A: VLT/X-shooter spectroscopy
  18. GRB 111008A: Swift-XRT refined Analysis
  19. GRB 111008A: Gemini spectroscopic redshift
  20. GRB 111008A, GROND observations
  21. GRB 111008A: NOT optical observation
  22. GRB 111008A: Gemini optical counterpart
  23. GRB 111008A: Enhanced Swift-XRT position
  24. GRB 111008A, Swift-BAT refined analysis,
  25. GRB 111008A: Swift detection of a burst
  26. GRB 111005A: ATCA 18 GHz detection
  27. GRB 111005A: ATCA radio upper limit
  28. GRB 111005A : miniTAO/ANIR NIR observations
  29. GRB 111005A: EVLA Observations
  30. GRB 111005A: VLT optical observations
  31. GRB 111005A: GROND NIR observations
  32. GRB 111005A: VLT IR observations
  33. GRB 111005A: Swift-BAT refined analysis
  34. GRB 111005A: bright galaxy in error circle
  35. GRB 111005A: Swift detection of a burst
  36. GRB 111003A: Fermi GBM detection
  37. GRB 110905A / MAXI J1836-194: optical monitoring
  38. GRB 110921A: MITSuME-Akeno Optical photometry
  39. Skynet/Dolomiti observations of GRB 110928A
  40. Skynet observations of GRB 110928A
  41. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  42. GRB 110928A: Swift/UVOT Upper Limits
  43. GRB 110928A: Swift-XRT refined Analysis
  44. GRB 110825A: GROND Observations
  45. GRB 110928A: Enhanced Swift-XRT position
  46. GRB 110928A: P60 Observations
  47. GRB 110928A: Further PAIRITEL NIR Observations
  48. GRB 110928A: Swift-BAT refined analysis
  49. GRB 110928A: Swift-XRT observations
  50. GRB 110928A: Swift/UVOT finding chart observation
  51. GRB 110928A: PAIRITEL NIR Observations
  52. GRB 110928A: ROTSE-III Optical Limits
  53. GRB 110928A: Swift detection of a burst
  54. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  55. GRB 110924A: Swift detection of a possible burst
  56. GCN for GRB 110921B
  57. GRB 110921A: Swift/UVOT Observations
  58. GRB110918A: Lick Observations
  59. GRB 110921A: NOT observations
  60. GRB 110921A: Fermi GBM observation
  61. GRB 110921A: TNT astrometry
  62. GRB 110921A: Swift-XRT refined Analysis
  63. GRB 110921A, Swift-BAT refined analysis
  64. GRB 110918A: Liverpool Telescope optical observations
  65. GRB 110918A: submm observations from APEX
  66. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  67. GRB 110921A: Enhanced Swift-XRT position
  68. GRB 110921A: MITSuME Akeno Optical Observation
  69. GRB 110921A : TNT optical counterpart candidate
  70. GRB 110918A: Swift-XRT refined Analysis
  71. GRB 110918A: Spectroscopy from GTC
  72. GRB 110921A: MASTER-Net early limit
  73. GRB 110921A: Swift detection of a burst
  74. GRB 110915B : X-ray afterglow confirmation
  75. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  76. GRB 110918A: rest-frame energetics in gamma-gays
  77. GRB 110918A optical observation
  78. GRB 110918A: Gemini-N redshift
  79. GRB 110918A: Afterglow Confirmation from PTF
  80. GRB 110918A: GROND detection of the afterglow candidate
  81. GRB 110918A: INT optical detection of Swift candidate afterglow
  82. GRB 110918A: Swift-XRT observations
  83. GRB 110918A: pseudo-z= from prompt emission spectrum
  84. Konus-Wind observation of GRB 110918A
  85. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  86. IPN triangulation of GRB 110918A (long duration, extremely intense)
  87. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  88. GRB 110915A: Swift/UVOT Upper Limits
  89. GRB 110915B: Swift/UVOT Upper Limits
  90. GRB 110915A: GROND Upper limits
  91. GRB 110915A, Swift-BAT refined analysis
  92. GRB 110915A: Swift-XRT refined Analysis
  93. GRB 110915B: Afterglow candidate from OSN
  94. GRB 110915A: Deep Near-IR Limits from Magellan
  95. GRB 110915B: XRT afterglow candidate
  96. GRB 110903A: Suzaku WAM observation of the prompt emission
  97. GRB 110915A: Deep Gemini-South i/z-band imaging
  98. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  99. GRB 110915A: NOT observations
  100. GRB 110915A: 1.23m CAHA I-band observations

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