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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"

41910 results found.

  1. GRB 160501A: SMARTS optical/IR observations
  2. VERITAS rapid follow-up observations of IceCube event 160427A
  3. GRB 160501A: Swift-BAT refined analysis
  4. GRB 160501A: GROND Upper limits
  5. GRB 160501A: MITSuME Okayama upper limits
  6. GRB 160501A: UKIRT near-IR upper limits
  7. GRB 160501A: Swift/UVOT Upper Limits
  8. GRB 160501A: Swift-XRT refined Analysis
  9. GRB 160501A: RATIR Optical and NIR Observations
  10. GRB 160501A: TAROT Calern observatory optical observations
  11. GRB 160501A MASTER-NET early observations
  12. GRB 160501A: NOT optical and NIR observations
  13. GRB 160501A: Swift detection of a burst
  14. IceCube-160427A: Fermi GBM Observations
  15. ICECUBE-160427A neutrino candidate event: updated direction information
  16. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  17. Archival observations by HAWC of IceCube HESE event of April 27, 2016
  18. Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
  19. GRB 160422A: XRT Afterglow Confirmation
  20. LSGT observation of GRB 160425A
  21. GRB 160425A: Swift/UVOT Detection
  22. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  23. GRB 160425A: Swift-BAT refined analysis
  24. GRB 160425A: SMARTS optical/IR observations
  25. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  26. GRB 160422A: GROND NIR afterglow detection
  27. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  28. GRB 160425A VLT/X-shooter redshift
  29. GRB 160425A: GROND observation
  30. GRB 160425A: Swift-XRT refined Analysis
  31. GRB 160422A: Swift/UVOT Afterglow Confirmation
  32. GRB 160422A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 160425A : MASTER earlier optical observations
  34. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  35. Konus-Wind observation of GRB 160424A
  36. LIGO/Virgo G197392 / LVT151012: Identification of a GW CBC Candidate
  37. GRB 160424A: Fermi GBM observation
  38. GRB 160424A - XRT position uncertain
  39. GRB 160424A: Swift-BAT refined analysis
  40. GRB 160424A: Swift/UVOT Upper Limit
  41. GRB 160424A: Swift-XRT observations
  42. GRB 160424A: Swift detection of a burst
  43. GRB 160422A: Swift-XRT afterglow detection
  44. GRB 160422A: Swift/UVOT Candidate Afterglow
  45. GRB 160419A: CALET Gamma-Ray Burst Monitor detection
  46. GRB 160422A: Fermi GBM observation
  47. GRB 160422A: Swift ToO observations
  48. GRB 160422A: Fermi-LAT Detection
  49. GRB 160419A, Swift-BAT refined analysis
  50. GRB 160419A: Fermi GBM detection
  51. GRB 160419A: Swift detection of a burst
  52. Fermi GBM trigger 482632364/160418023 is not a GRB
  53. GRB 160417A: GMG observations
  54. GRB 160417A: Swift-BAT refined analysis
  55. GRB 160417A: Swift/UVOT Detection
  56. GRB 160417A: Swift-XRT refined Analysis
  57. GRB 160417A: MITSuME Okayama upper limits
  58. GRB 160417A: KAIT optical afterglow confirmation
  59. GRB 160417A: Swift detection of a burst with an optical counterpart
  60. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  61. GRB 160412A: GROND upper limits
  62. GRB 160411A - Gemini-S afterglow candidate
  63. Konus-Wind observation of GRB 160409A
  64. GRB 160410A: SMARTS optical/IR observations
  65. GRB 160410A: TLS Tautenburg observations
  66. GRB 160412A: Swift/UVOT Upper Limits
  67. GRB 160410A: JCMT SCUBA-2 sub-mm observation
  68. GRB 160409A: Swift-XRT observations
  69. GRB 160409A found in Swift BAT ground analysis
  70. GRB 160412A: Swift-XRT refined Analysis
  71. GRB 160411A: Swift-BAT refined analysis of the short burst
  72. GRB 160412A: Swift-BAT refined analysis
  73. GRB 160410A: further NOT optical observations
  74. GRB 160412A: Swift detection of a burst
  75. GRB 160408A: CALET Gamma-Ray Burst Monitor detection
  76. GRB 160409A: Swift ToO observations
  77. GRB 160410A: NOT observations of the afterglow
  78. GRB 160408A: 6.0 GHz VLA upper limit
  79. GRB 160411A: Gemini-S optical observations
  80. GRB 160411A: GROND Optical/NIR upper limits
  81. GRB 160411A: Swift/UVOT Upper Limits
  82. GRB 160410A: UKIRT near-IR upper limits
  83. GRB 160411A: Fermi GBM detection
  84. Konus-Wind observation of GRB 160410A (short/hard)
  85. GRB 160410A: TAROT La Silla observatory early optical observations
  86. GRB 160411A: Swift-XRT refined Analysis
  87. GRB 160410A: MITSuME Akeno optical upper limits
  88. GRB 160411A: MASTER-NET early optical observations.
  89. GRB 160410A: Swift-XRT refined Analysis
  90. GRB 160410A: GMG observation
  91. GRB 160411A: Swift detection of a short burst
  92. GRB 160410A: Keck-I/LRIS redshift
  93. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  94. GRB 160410A: Swift-BAT refined analysis of the short GRB
  95. GRB 160410A: Swift/UVOT Detection
  96. GRB 160410A: VLT/X-shooter redshift
  97. GRB 160410A: GROND optical detection
  98. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  99. GRB 160408A: GMG observation limit
  100. GRB 160408A: Gemini afterglow confirmation

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