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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"

18515 results found.

  1. GRB 111022A: Swift/UVOT Upper Limits
  2. GRB 111016A: optical upper limit
  3. GRB 111022B: NOT observations
  4. GRB 111022B: Enhanced Swift-XRT position
  5. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  6. GRB 111022B: Swift detection of a burst
  7. GRB 111022A: Swift detection of a burst
  8. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  9. GRB 111020A: Swift/UVOT Upper Limits
  10. GRB 111020A: Enhanced Swift-XRT position
  11. GRB 111020A: BOOTES-3 Optical Upper Limit.
  12. GRB 111020A: Swift detection of a short burst
  13. GRB 111018A: Swift/UVOT Upper Limits
  14. GRB 111018A: GROND Upper Limits
  15. GRB 111018A: Enhanced Swift-XRT position
  16. IPN Triangulation of GRB 111016B (long duration, intense)
  17. GRB111016A : WIYN 3.5m NIR observations
  18. GRB 111018A: Swift detection of a burst
  19. GRB111016A: D50 optical limit
  20. GRB 111016A: Gemini Detection of the NIR Counterpart
  21. GRB 111016A: Swift/UVOT Detection of a Source
  22. GRB 111016A: P60 Afterglow Candidate
  23. GRB 111016A: Enhanced Swift-XRT position
  24. GRB 111016A: Swift-XRT observations
  25. GRB 111016A: Swift detection of a burst
  26. GRB 110921A: optical observations
  27. GRB 111008A: Swift/UVOT Upper Limits
  28. GRB 111008A: IAC80 I-band observations
  29. GRB 111008A: Swift-XRT refined Analysis
  30. GRB 111008A, GROND observations
  31. GRB 111008A: NOT optical observation
  32. GRB 111008A: Gemini optical counterpart
  33. GRB 111008A: Enhanced Swift-XRT position
  34. GRB 111008A, Swift-BAT refined analysis,
  35. GRB 111008A: Swift detection of a burst
  36. GRB 111005A: ATCA 18 GHz detection
  37. GRB 111005A: ATCA radio upper limit
  38. GRB 111005A : miniTAO/ANIR NIR observations
  39. GRB 111005A: GROND NIR observations
  40. GRB 111005A: VLT IR observations
  41. GRB 110921A: MITSuME-Akeno Optical photometry
  42. Skynet/Dolomiti observations of GRB 110928A
  43. Skynet observations of GRB 110928A
  44. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  45. GRB 110928A: Swift/UVOT Upper Limits
  46. GRB 110825A: GROND Observations
  47. GRB 110928A: Enhanced Swift-XRT position
  48. GRB 110928A: P60 Observations
  49. GRB 110928A: Further PAIRITEL NIR Observations
  50. GRB 110928A: Swift-XRT observations
  51. GRB 110928A: Swift/UVOT finding chart observation
  52. GRB 110928A: PAIRITEL NIR Observations
  53. GRB 110928A: ROTSE-III Optical Limits
  54. GRB 110924A: Swift detection of a possible burst
  55. GRB 110921A: Swift/UVOT Observations
  56. GRB 110921A: NOT observations
  57. GRB 110921A: Fermi GBM observation
  58. GRB 110921A: TNT astrometry
  59. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  60. GRB 110921A: Enhanced Swift-XRT position
  61. GRB 110921A: Swift detection of a burst
  62. GRB 110915B : X-ray afterglow confirmation
  63. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  64. GRB 110918A optical observation
  65. GRB 110918A: GROND detection of the afterglow candidate
  66. GRB 110918A: INT optical detection of Swift candidate afterglow
  67. GRB 110918A: Swift-XRT observations
  68. Swift detection of short bursts from PSR J1647-4552
  69. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  70. GRB 110915A: Swift/UVOT Upper Limits
  71. GRB 110915B: Swift/UVOT Upper Limits
  72. GRB 110915A: GROND Upper limits
  73. GRB 110915B: Afterglow candidate from OSN
  74. GRB 110915A: Deep Near-IR Limits from Magellan
  75. GRB 110915B: XRT afterglow candidate
  76. GRB 110915A: Deep Gemini-South i/z-band imaging
  77. GRB110915A MITSuME Okayama J-band upper-limit
  78. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  79. GRB 110915A: NOT observations
  80. GRB 110915A: 1.23m CAHA I-band observations
  81. GRB 110915A: Enhanced Swift-XRT position
  82. GRB 110915A: GMG optical upper limit
  83. GRB 110915A: MASTER-Net early limit
  84. GRB 110915A: Swift detection of a burst
  85. GRB 110825A: Further Swift/XRT Observations
  86. GRB 110731A: SAO RAS and Terskol observations
  87. GRB 110903A: Swift/UVOT Upper Limits
  88. GRB 110903A: Swift-XRT observations
  89. GRB 110820A: optical upper limit
  90. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  91. Trigger 502024: Swift detection of KS 1741-293
  92. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  93. GRB 110825A: GMG optical observation
  94. GRB 110827A, Swift-BAT refined analysis
  95. GRB 110825A: optical afterglow candidate
  96. GRB 110825A: field inspection and possible host galaxy
  97. GRB110825A: Swift target of opportunity observation
  98. IPN triangulation of GRB110825A (very intense, long-duration)
  99. Swift-BAT Trigger 501485 is noise
  100. IPN triangulation of GRB 110820B (very long duration, extremely intense)

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