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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"

45736 results found.

  1. GRB 110918A optical observation
  2. GRB 110918A: Gemini-N redshift
  3. GRB 110918A: Afterglow Confirmation from PTF
  4. GRB 110918A: GROND detection of the afterglow candidate
  5. GRB 110918A: INT optical detection of Swift candidate afterglow
  6. GRB 110918A: Swift-XRT observations
  7. GRB 110918A: pseudo-z= from prompt emission spectrum
  8. Konus-Wind observation of GRB 110918A
  9. GRB110918A: BOOTES-1 optical limit
  10. MAXI/GSC detection of a short soft X-ray transient
  11. Swift detection of short bursts from PSR J1647-4552
  12. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  13. IPN triangulation of GRB 110918A (long duration, extremely intense)
  14. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  15. GRB 110915A: Swift/UVOT Upper Limits
  16. GRB 110915B: Swift/UVOT Upper Limits
  17. GRB 110915A: GROND Upper limits
  18. GRB 110915A, Swift-BAT refined analysis
  19. GRB 110915A: Swift-XRT refined Analysis
  20. GRB 110915B: Afterglow candidate from OSN
  21. GRB 110915A: Deep Near-IR Limits from Magellan
  22. GRB 110915B: XRT afterglow candidate
  23. GRB 110903A: Suzaku WAM observation of the prompt emission
  24. GRB 110915A: Deep Gemini-South i/z-band imaging
  25. GRB110915A MITSuME Okayama J-band upper-limit
  26. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  27. GRB 110915A: NOT observations
  28. GRB 110915A: 1.23m CAHA I-band observations
  29. GRB 110915B: SuperAGILE localization of a long GRB
  30. GRB 110915A: Enhanced Swift-XRT position
  31. GRB 110915A: GMG optical upper limit
  32. GRB 110915A: MITSuME Akeno Optical upper limits
  33. GRB 110915A: MASTER-Net early limit
  34. GRB 110915A: Prompt enhanced Swift-XRT position
  35. GRB 110915A: Swift detection of a burst
  36. GRB 110825A: Further Swift/XRT Observations
  37. GRB 110731A: SAO RAS and Terskol observations
  38. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  39. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  40. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  41. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  42. GRB 110905A: KAIT observations
  43. GRB 110905A: Swift detection of a burst
  44. GRB 110903A: Fermi GBM observation
  45. GRB 110903A: Swift/UVOT Upper Limits
  46. GRB 110903A: Swift-XRT observations
  47. Konus-Wind observation of GRB 110903A
  48. GRB 110903A: a long GRB detected by INTEGRAL
  49. GRB 110820A: optical upper limit
  50. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  51. Trigger 502024: Swift detection of KS 1741-293
  52. GRB110825A: Fermi GBM observation
  53. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  54. Swift detection of an SGR burst from Swift J1834.9-0846
  55. GRB 110825A: Suzaku WAM observation of the prompt emission
  56. GRB 110825A: GMG optical observation
  57. GRB110825A: ROTSE early time optical limit
  58. GRB 110827A, Swift-BAT refined analysis
  59. GRB 110825A: optical afterglow candidate
  60. GRB 110827A: Swift detection of a burst
  61. GRB 110825A: field inspection and possible host galaxy
  62. GRB110825A: Swift target of opportunity observation
  63. IPN triangulation of GRB110825A (very intense, long-duration)
  64. GRB 110820A, the review of the sky area in plate archives
  65. Swift-BAT Trigger 501485 is noise
  66. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  67. Fermi GBM trigger 110823.518 is not a GRB
  68. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  69. Konus-Wind observation of GRB 110820B
  70. GRB 110820A: MASTER-NET first hour observations
  71. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  72. GRB 110820A: Swift/UVOT Upper Limits
  73. GRB 110820A: Position udpate + 2nd epoch data
  74. GRB 110820A: i-band finding chart + correction to 12295
  75. GRB 110820A: CQUEAN izY Observation
  76. GRB 110820A: Swift-XRT refined Analysis
  77. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  78. GRB 110820A: Swift-BAT refined analysis
  79. GRB 110820A: Enhanced Swift-XRT position
  80. GRB 110820A: CrAO optical upper limit
  81. GRB 110820A: MASTER-NET observations
  82. GRB 110820A: Swift detection of a burst
  83. GRB 110818A: Fermi GBM observation
  84. GRB 110818A: Swift/UVOT Upper Limits
  85. GRB 110818A: Enhanced Swift-XRT position
  86. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  87. GRB 110818A: Swift-XRT refined Analysis
  88. GRB 110815A: Swift-XRT and UVOT refined Analysis
  89. GRB 110818A, Swift-BAT refined analysis
  90. GRB 110815A : Suzaku WAM observation of the prompt emission
  91. GRB 110818A: Swift detection of a burst
  92. Konus-Wind observation of GRB 110815A
  93. IPN triangulation of GRB110815A (long, intense)
  94. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  95. GRB 110801A: optical observations at Mt. Terskol observatory
  96. GRB 110812A: SuperAGILE localization of a long GRB.
  97. Reprocessed enhanced Swift-XRT positions and GRB products: update
  98. SGR 1834.9-0846/ GRB 110807A, I-band observations
  99. Konus-Wind observation of GRB 110808B
  100. Konus-Wind observation of GRB 110808A

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