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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"

19701 results found.

  1. GRB 110928A: Swift/UVOT Upper Limits
  2. GRB 110825A: GROND Observations
  3. GRB 110928A: Enhanced Swift-XRT position
  4. GRB 110928A: P60 Observations
  5. GRB 110928A: Further PAIRITEL NIR Observations
  6. GRB 110928A: Swift-XRT observations
  7. GRB 110928A: Swift/UVOT finding chart observation
  8. GRB 110928A: PAIRITEL NIR Observations
  9. GRB 110928A: ROTSE-III Optical Limits
  10. GRB 110924A: Swift detection of a possible burst
  11. GRB 110921A: Swift/UVOT Observations
  12. GRB 110921A: NOT observations
  13. GRB 110921A: TNT astrometry
  14. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  15. GRB 110921A: Enhanced Swift-XRT position
  16. GRB 110921A : TNT optical counterpart candidate
  17. GRB 110921A: Swift detection of a burst
  18. GRB 110915B : X-ray afterglow confirmation
  19. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  20. GRB 110918A optical observation
  21. GRB 110918A: Afterglow Confirmation from PTF
  22. GRB 110918A: GROND detection of the afterglow candidate
  23. GRB 110918A: INT optical detection of Swift candidate afterglow
  24. GRB 110918A: Swift-XRT observations
  25. Swift detection of short bursts from PSR J1647-4552
  26. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  27. GRB 110915A: Swift/UVOT Upper Limits
  28. GRB 110915B: Swift/UVOT Upper Limits
  29. GRB 110915A: GROND Upper limits
  30. GRB 110915B: Afterglow candidate from OSN
  31. GRB 110915A: Deep Near-IR Limits from Magellan
  32. GRB 110915B: XRT afterglow candidate
  33. GRB 110915A: Deep Gemini-South i/z-band imaging
  34. GRB110915A MITSuME Okayama J-band upper-limit
  35. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  36. GRB 110915A: NOT observations
  37. GRB 110915A: 1.23m CAHA I-band observations
  38. GRB 110915A: Enhanced Swift-XRT position
  39. GRB 110915A: GMG optical upper limit
  40. GRB 110915A: MASTER-Net early limit
  41. GRB 110915A: Swift detection of a burst
  42. GRB 110825A: Further Swift/XRT Observations
  43. GRB 110731A: SAO RAS and Terskol observations
  44. GRB 110905A: Swift detection of a burst
  45. GRB 110903A: Swift/UVOT Upper Limits
  46. GRB 110903A: Swift-XRT observations
  47. GRB 110820A: optical upper limit
  48. Trigger 502024: Swift detection of KS 1741-293
  49. GRB 110825A: Suzaku WAM observation of the prompt emission
  50. GRB 110825A: GMG optical observation
  51. GRB110825A: ROTSE early time optical limit
  52. GRB 110827A, Swift-BAT refined analysis
  53. GRB 110825A: optical afterglow candidate
  54. GRB 110825A: field inspection and possible host galaxy
  55. GRB110825A: Swift target of opportunity observation
  56. IPN triangulation of GRB110825A (very intense, long-duration)
  57. Swift-BAT Trigger 501485 is noise
  58. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  59. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  60. GRB 110820A: Swift/UVOT Upper Limits
  61. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  62. GRB 110820A: Enhanced Swift-XRT position
  63. GRB 110820A: CrAO optical upper limit
  64. GRB 110820A: Swift detection of a burst
  65. GRB 110818A: Swift/UVOT Upper Limits
  66. GRB 110818A: Enhanced Swift-XRT position
  67. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  68. GRB 110818A: Swift-XRT refined Analysis
  69. GRB 110815A: Swift-XRT and UVOT refined Analysis
  70. GRB 110818A: Swift detection of a burst
  71. Konus-Wind observation of GRB 110815A
  72. GRB 110801A: optical observations at Mt. Terskol observatory
  73. Konus-Wind observation of GRB 110808B
  74. Konus-Wind observation of GRB 110808A
  75. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  76. GRB 110808A: Swift/UVOT Detection
  77. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  78. GRB 110808A: VLT/X-shooter spectroscopy
  79. GRB 110808A: Enhanced Swift-XRT position
  80. GRB 110808A: Swift detection of a burst with optical counterpart
  81. Fermi GBM detection of a SGR-like burst
  82. GRB 110807A: SAO RAS observations
  83. GRB 110807A: Swift detection of a burst or a posible new SGR
  84. GRB 110726A: two epochs of SAO RAS optical observations
  85. IPN triangulation of GRB110802A (short/hard burst)
  86. GRB 110801A: optical observations in CrAO
  87. EVLA observation for Fermi burst GRB 110721A
  88. GRB 110801A: SAO RAS optical observations
  89. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  90. Swift/UVOT observations of GRB110801A
  91. GRB110801A: MITSuME Ishigakijima Optical Observation
  92. GRB 110801A: Enhanced Swift-XRT position
  93. GRB 110801A: Swift detection of a burst with an optical counterpart
  94. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  95. GRB 110731A: Swift-XRT refined Analysis
  96. GRB110731A: Swift/UVOT Observations
  97. GRB 110731A: NOT photometry
  98. GRB 110731A: Enhanced Swift-XRT position
  99. GRB 110731A: Swift-BAT refined analysis
  100. GRB 110731A: Swift detection of a burst with an optical counterpart

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