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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"

37724 results found.

  1. GRB 110928A: Swift-XRT refined Analysis
  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-BAT refined analysis
  7. GRB 110928A: Swift-XRT observations
  8. GRB 110928A: Swift/UVOT finding chart observation
  9. GRB 110928A: PAIRITEL NIR Observations
  10. GRB 110928A: ROTSE-III Optical Limits
  11. GRB 110928A: Swift detection of a burst
  12. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  13. GRB 110924A: Swift detection of a possible burst
  14. GCN for GRB 110921B
  15. GRB 110921A: Swift/UVOT Observations
  16. GRB110918A: Lick Observations
  17. GRB 110921A: NOT observations
  18. GRB 110921A: Fermi GBM observation
  19. GRB 110921A: TNT astrometry
  20. GRB 110921A: Swift-XRT refined Analysis
  21. GRB 110921A, Swift-BAT refined analysis
  22. GRB 110918A: Liverpool Telescope optical observations
  23. GRB 110918A: submm observations from APEX
  24. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  25. GRB 110921A: Enhanced Swift-XRT position
  26. GRB 110921A: MITSuME Akeno Optical Observation
  27. GRB 110921A : TNT optical counterpart candidate
  28. GRB 110918A: Swift-XRT refined Analysis
  29. GRB 110918A: Spectroscopy from GTC
  30. GRB 110921A: MASTER-Net early limit
  31. GRB 110921A: Swift detection of a burst
  32. GRB 110915B : X-ray afterglow confirmation
  33. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  34. GRB 110918A: rest-frame energetics in gamma-gays
  35. GRB 110918A optical observation
  36. GRB 110918A: Gemini-N redshift
  37. GRB 110918A: Afterglow Confirmation from PTF
  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. GRB 110918A: pseudo-z= from prompt emission spectrum
  42. Konus-Wind observation of GRB 110918A
  43. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  44. IPN triangulation of GRB 110918A (long duration, extremely intense)
  45. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  46. GRB 110915A: Swift/UVOT Upper Limits
  47. GRB 110915B: Swift/UVOT Upper Limits
  48. GRB 110915A: GROND Upper limits
  49. GRB 110915A, Swift-BAT refined analysis
  50. GRB 110915A: Swift-XRT refined Analysis
  51. GRB 110915B: Afterglow candidate from OSN
  52. GRB 110915A: Deep Near-IR Limits from Magellan
  53. GRB 110915B: XRT afterglow candidate
  54. GRB 110903A: Suzaku WAM observation of the prompt emission
  55. GRB 110915A: Deep Gemini-South i/z-band imaging
  56. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  57. GRB 110915A: NOT observations
  58. GRB 110915A: 1.23m CAHA I-band observations
  59. GRB 110915B: SuperAGILE localization of a long GRB
  60. GRB 110915A: Enhanced Swift-XRT position
  61. GRB 110915A: GMG optical upper limit
  62. GRB 110915A: MITSuME Akeno Optical upper limits
  63. GRB 110915A: MASTER-Net early limit
  64. GRB 110915A: Prompt enhanced Swift-XRT position
  65. GRB 110915A: Swift detection of a burst
  66. GRB 110825A: Further Swift/XRT Observations
  67. GRB 110731A: SAO RAS and Terskol observations
  68. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  69. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  70. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  71. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  72. GRB 110905A: KAIT observations
  73. GRB 110905A: Swift detection of a burst
  74. GRB 110903A: Fermi GBM observation
  75. GRB 110903A: Swift/UVOT Upper Limits
  76. GRB 110903A: Swift-XRT observations
  77. Konus-Wind observation of GRB 110903A
  78. GRB 110903A: a long GRB detected by INTEGRAL
  79. GRB 110820A: optical upper limit
  80. GRB110825A: Fermi GBM observation
  81. GRB 110825A: Suzaku WAM observation of the prompt emission
  82. GRB 110825A: GMG optical observation
  83. GRB110825A: ROTSE early time optical limit
  84. GRB 110827A, Swift-BAT refined analysis
  85. GRB 110825A: optical afterglow candidate
  86. GRB 110827A: Swift detection of a burst
  87. GRB 110825A: field inspection and possible host galaxy
  88. IPN triangulation of GRB110825A (very intense, long-duration)
  89. GRB 110820A, the review of the sky area in plate archives
  90. Fermi GBM trigger 110823.518 is not a GRB
  91. Konus-Wind observation of GRB 110820B
  92. GRB 110820A: MASTER-NET first hour observations
  93. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  94. GRB 110820A: Swift/UVOT Upper Limits
  95. GRB 110820A: Position udpate + 2nd epoch data
  96. GRB 110820A: i-band finding chart + correction to 12295
  97. GRB 110820A: CQUEAN izY Observation
  98. GRB 110820A: Swift-XRT refined Analysis
  99. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  100. GRB 110820A: Swift-BAT refined analysis

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