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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"

28224 results found.

  1. GRB 110915B : X-ray afterglow confirmation
  2. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  3. GRB 110918A: rest-frame energetics in gamma-gays
  4. GRB 110918A: Gemini-N redshift
  5. GRB 110918A: Afterglow Confirmation from PTF
  6. GRB 110918A: GROND detection of the afterglow candidate
  7. GRB 110918A: INT optical detection of Swift candidate afterglow
  8. GRB 110918A: Swift-XRT observations
  9. MAXI/GSC detection of a short soft X-ray transient
  10. Swift detection of short bursts from PSR J1647-4552
  11. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  12. GRB 110915A: Swift/UVOT Upper Limits
  13. GRB 110915B: Swift/UVOT Upper Limits
  14. GRB 110915A: GROND Upper limits
  15. GRB 110915A: Swift-XRT refined Analysis
  16. GRB 110915B: Afterglow candidate from OSN
  17. GRB 110915A: Deep Near-IR Limits from Magellan
  18. GRB 110915B: XRT afterglow candidate
  19. GRB 110915A: Deep Gemini-South i/z-band imaging
  20. GRB110915A MITSuME Okayama J-band upper-limit
  21. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  22. GRB 110915A: NOT observations
  23. GRB 110915A: 1.23m CAHA I-band observations
  24. GRB 110915A: Enhanced Swift-XRT position
  25. GRB 110915A: GMG optical upper limit
  26. GRB 110915A: MITSuME Akeno Optical upper limits
  27. GRB 110915A: Prompt enhanced Swift-XRT position
  28. GRB 110915A: Swift detection of a burst
  29. GRB 110825A: Further Swift/XRT Observations
  30. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  31. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  32. GRB 110905A: Swift detection of a burst
  33. GRB 110903A: Swift/UVOT Upper Limits
  34. GRB 110903A: Swift-XRT observations
  35. GRB 110820A: optical upper limit
  36. Trigger 502024: Swift detection of KS 1741-293
  37. Swift detection of an SGR burst from Swift J1834.9-0846
  38. GRB 110825A: GMG optical observation
  39. GRB110825A: ROTSE early time optical limit
  40. GRB 110825A: optical afterglow candidate
  41. GRB 110827A: Swift detection of a burst
  42. GRB 110825A: field inspection and possible host galaxy
  43. GRB110825A: Swift target of opportunity observation
  44. Swift-BAT Trigger 501485 is noise
  45. GRB 110820A: Swift/UVOT Upper Limits
  46. GRB 110820A: Position udpate + 2nd epoch data
  47. GRB 110820A: CQUEAN izY Observation
  48. GRB 110820A: Swift-XRT refined Analysis
  49. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  50. GRB 110820A: Enhanced Swift-XRT position
  51. GRB 110820A: CrAO optical upper limit
  52. GRB 110820A: Swift detection of a burst
  53. GRB 110818A: Swift/UVOT Upper Limits
  54. GRB 110818A: Enhanced Swift-XRT position
  55. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  56. GRB 110818A: Swift-XRT refined Analysis
  57. GRB 110815A: Swift-XRT and UVOT refined Analysis
  58. GRB 110818A: Swift detection of a burst
  59. GRB 110801A: optical observations at Mt. Terskol observatory
  60. Reprocessed enhanced Swift-XRT positions and GRB products: update
  61. SGR 1834.9-0846/ GRB 110807A, I-band observations
  62. A new photometric resource for GRB observers
  63. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  64. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  65. GRB 110808A: Swift/UVOT Detection
  66. GRB 110808A: Swift-XRT refined Analysis
  67. SGR J1834.9-0846: A Neutron Star in W41?
  68. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  69. GRB 110808A: VLT/X-shooter spectroscopy
  70. GRB 110808A: Enhanced Swift-XRT position
  71. GRB 110808A: Swift detection of a burst with optical counterpart
  72. Fermi GBM detection of a SGR-like burst
  73. GRB 110807A: SAO RAS observations
  74. GRB 110807A: Swift detection of a burst or a posible new SGR
  75. Reprocessed enhanced Swift-XRT positions and GRB products
  76. EVLA observation for Fermi burst GRB 110721A
  77. GRB 110726A: Swift-XRT refined Analysis
  78. GRB110731A: MOA optical observations of the steeply fading afterglow
  79. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  80. GRB 110801A: Evidence for a jet break
  81. Swift/UVOT observations of GRB110801A
  82. GRB 110801A: Swift-XRT refined Analysis
  83. GRB 110801A: Afterglow redshift from 10.4m GTC
  84. GRB110801A: MITSuME Ishigakijima Optical Observation
  85. GRB 110801A: Enhanced Swift-XRT position
  86. AXP 4U 0142+61: Fermi GBM detection
  87. GRB 110801A: TLS Optical afterglow confirmation
  88. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  89. GRB 110801A: Swift detection of a burst with an optical counterpart
  90. GRB 110731A / EVLA upper limits
  91. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  92. GRB 110731A Gemini-N redshift
  93. GRB 110731A: Swift-XRT refined Analysis
  94. GRB110731A: Swift/UVOT Observations
  95. GRB 110731A: NOT photometry
  96. GRB 110731A: Enhanced Swift-XRT position
  97. Fermi-LAT Detection of GRB110731A
  98. GRB 110731A: FTN+FTS afterglow observations
  99. GRB 110731A: Swift detection of a burst with an optical counterpart
  100. INTEGRAL Weak trigger #6331: GRT Optical Observation

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