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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"

23562 results found.

  1. GRB 111008A: Enhanced Swift-XRT position
  2. GRB 111008A: Swift detection of a burst
  3. GRB 111005A: ATCA 18 GHz detection
  4. GRB 111005A: ATCA radio upper limit
  5. GRB 111005A : miniTAO/ANIR NIR observations
  6. GRB 111005A: GROND NIR observations
  7. GRB 111005A: VLT IR observations
  8. GRB 111005A: Swift detection of a burst
  9. GRB 111003A: Fermi GBM detection
  10. GRB 110921A: MITSuME-Akeno Optical photometry
  11. Skynet/Dolomiti observations of GRB 110928A
  12. Skynet observations of GRB 110928A
  13. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  14. GRB 110928A: Swift/UVOT Upper Limits
  15. Trigger 504307: Swift detection of MAXI J1836-194
  16. GRB 110825A: GROND Observations
  17. GRB 110928A: Enhanced Swift-XRT position
  18. GRB 110928A: P60 Observations
  19. GRB 110928A: Further PAIRITEL NIR Observations
  20. GRB 110928A: Swift-XRT observations
  21. GRB 110928A: Swift/UVOT finding chart observation
  22. GRB 110928A: PAIRITEL NIR Observations
  23. GRB 110928A: ROTSE-III Optical Limits
  24. GRB 110928A: Swift detection of a burst
  25. Swift-BAT trigger 503926 is noise
  26. GRB 110924A: Swift detection of a possible burst
  27. GCN for GRB 110921B
  28. GRB 110921A: Swift/UVOT Observations
  29. GRB 110921A: NOT observations
  30. GRB 110921A: TNT astrometry
  31. GRB 110918A: submm observations from APEX
  32. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  33. GRB 110921A: Enhanced Swift-XRT position
  34. GRB 110921A: Swift detection of a burst
  35. GRB 110915B : X-ray afterglow confirmation
  36. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  37. GRB 110918A optical observation
  38. GRB 110918A: GROND detection of the afterglow candidate
  39. GRB 110918A: INT optical detection of Swift candidate afterglow
  40. GRB 110918A: Swift-XRT observations
  41. Swift detection of short bursts from PSR J1647-4552
  42. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  43. IPN triangulation of GRB 110918A (long duration, extremely intense)
  44. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  45. GRB 110915A: Swift/UVOT Upper Limits
  46. GRB 110915B: Swift/UVOT Upper Limits
  47. GRB 110915A: GROND Upper limits
  48. GRB 110915B: Afterglow candidate from OSN
  49. GRB 110915A: Deep Near-IR Limits from Magellan
  50. GRB 110915B: XRT afterglow candidate
  51. GRB 110915A: Deep Gemini-South i/z-band imaging
  52. GRB110915A MITSuME Okayama J-band upper-limit
  53. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  54. GRB 110915A: NOT observations
  55. GRB 110915A: 1.23m CAHA I-band observations
  56. GRB 110915A: Enhanced Swift-XRT position
  57. GRB 110915A: GMG optical upper limit
  58. GRB 110915A: MASTER-Net early limit
  59. GRB 110915A: Swift detection of a burst
  60. GRB 110825A: Further Swift/XRT Observations
  61. GRB 110731A: SAO RAS and Terskol observations
  62. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  63. GRB 110905A: Swift detection of a burst
  64. GRB 110903A: Fermi GBM observation
  65. GRB 110903A: Swift/UVOT Upper Limits
  66. GRB 110903A: Swift-XRT observations
  67. GRB 110903A: a long GRB detected by INTEGRAL
  68. GRB 110820A: optical upper limit
  69. Trigger 502024: Swift detection of KS 1741-293
  70. Swift detection of an SGR burst from Swift J1834.9-0846
  71. GRB 110825A: Suzaku WAM observation of the prompt emission
  72. GRB 110825A: GMG optical observation
  73. GRB110825A: ROTSE early time optical limit
  74. GRB 110827A, Swift-BAT refined analysis
  75. GRB 110825A: optical afterglow candidate
  76. GRB 110827A: Swift detection of a burst
  77. GRB 110825A: field inspection and possible host galaxy
  78. GRB110825A: Swift target of opportunity observation
  79. IPN triangulation of GRB110825A (very intense, long-duration)
  80. Swift-BAT Trigger 501485 is noise
  81. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  82. GRB 110820A: Swift/UVOT Upper Limits
  83. GRB 110820A: Position udpate + 2nd epoch data
  84. GRB 110820A: CQUEAN izY Observation
  85. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  86. GRB 110820A: Enhanced Swift-XRT position
  87. GRB 110820A: CrAO optical upper limit
  88. GRB 110820A: Swift detection of a burst
  89. GRB 110818A: Swift/UVOT Upper Limits
  90. GRB 110818A: Enhanced Swift-XRT position
  91. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  92. GRB 110818A: Swift-XRT refined Analysis
  93. GRB 110815A: Swift-XRT and UVOT refined Analysis
  94. GRB 110818A: Swift detection of a burst
  95. IPN triangulation of GRB110815A (long, intense)
  96. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  97. GRB 110801A: optical observations at Mt. Terskol observatory
  98. GRB 110812A: SuperAGILE localization of a long GRB.
  99. IPN triangulation of GRB 110808B (short/hard/intense)
  100. A new photometric resource for GRB observers

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