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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"

27600 results found.

  1. GRB 160104A: Swift-BAT refined analysis
  2. GRB 160104A: Fermi GBM observation
  3. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  4. GRB 160104A: GWAC upper limit during prompt emission phase
  5. GRB 160104A: MASTER early OT detection
  6. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  7. GRB 160104A: LCOGT-FTN afterglow candidate
  8. GRB 160104A: Swift detection of a burst
  9. LIGO/Virgo G211117: Fermi/LAT observations
  10. LIGO/Virgo G211117: Gemini classification of 7 Pan-STARRS transients
  11. LIGO/Virgo G211117: LOFAR follow-up
  12. LIGO/Virgo G211117: MASTER OTs 26.XII.2015 - 01.I.2016
  13. GRB 160101B: Fermi-LAT detection
  14. GRB 160101B: Fermi GBM detection
  15. GRB 160101A: Fermi GBM observation
  16. LIGO/Virgo G211117: FLOYDS Classification of SMTJ13331687-1607330 as a Two-Week-Old Type Ia Supernova
  17. GRB 151231B: Fermi GBM observation
  18. GRB 151231A: Fermi GBM observation
  19. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  20. Trigger 668949: Swift detection of V 404 Cyg
  21. LIGO/Virgo G211117: MAXI/GSC observations
  22. MASTER-NET observations of V404Cyg Swift Trigger 668877
  23. Trigger 668879: Swift detection of V 404 Cyg again
  24. Trigger 668877: Swift detection of V 404 Cyg
  25. LIGO/Virgo G211117: MAGIC very-high energy gamma-ray observations
  26. IPN Triangulation of GRB 151227B
  27. GRB 151228A: Correction to GCN 18770
  28. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  29. GRB 151228A: Swift-XRT refined Analysis
  30. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  31. LIGO/Virgo G211117: MASTER Observations of the 3 iPTF candidates
  32. V404Cyg Swift Trigger 668097: AbAO optical observations
  33. GRB 151228B: Swift/UVOT Detection
  34. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  35. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  36. GRB 151229A Swift-BAT Spectral lag analysis
  37. GRB 151229A: Swift-XRT refined Analysis
  38. GRB 151229A: Fermi GBM observation
  39. GRB 151228B: Fermi GBM observation
  40. GRB 151228A: Swift-BAT refined analysis
  41. GRB 151229A: Swift/UVOT observations
  42. GRB 151228B: Swift-BAT refined analysis
  43. GRB 151229A: Swift-BAT refined analysis
  44. GRB 151228B: Swift-XRT refined Analysis
  45. LIGO/Virgo G211117: Further Swift-XRT sources
  46. GRB 151228A: MITSuME Akeno optical upper limits
  47. GRB 151228A: T60 observations
  48. GRB 151229A: Swift detection of a short burst
  49. LIGO/Virgo G211117: DESGW program observations with DECam
  50. GRB 151228B: Swift detection of a burst with an optical detection
  51. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  52. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  53. GRB 151228A: Fermi GBM observation
  54. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  55. LIGO/Virgo G211117: Further Swift-XRT sources
  56. LIGO/Virgo G211117: Swift-XRT sources
  57. GRB 151228A: Swift detection of a short burst
  58. GRB 151227B: Fermi GBM detection
  59. GRB 151227A: Fermi GBM detection
  60. GRB 151212A iTelescope observation
  61. GRB 151225A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  62. Konus-Wind observation of GRB 151222A
  63. Fermi GBM trigger 472694170/151224997 is not a GRB
  64. V404Cyg Swift Trigger 668097: TSHAO optical observations
  65. Fermi GBM trigger 151221730 is not a GRB
  66. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  67. V404Cyg Swift Trigger 668097:
  68. Trigger 668097: Swift detection of V 404 Cyg
  69. GRB 151222A: Fermi GBM detection
  70. Fermi GBM trigger 151221690 is not a GRB
  71. Fermi GBM trigger 472271765/151220108 is not a GRB
  72. Fermi GBM trigger 472166503/151218890 is not a GRB
  73. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  74. GRB151215A: Continued P60 Observations
  75. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  76. GRB 151210B: Fermi GBM observation
  77. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  78. GRB 151215A: Swift-XRT refined Analysis
  79. GRB 151215A: Swift-BAT refined analysis
  80. GRB151215A: Swift/UVOT detection
  81. GRB 151215A: MASTER early OT detection and light curve
  82. GRB 151215A: NOT spectroscopy and redshift
  83. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  84. GRB151215A: P60 Optical Afterglow Candidate
  85. GRB 151215A: Swift detection of a burst
  86. LIGO/Virgo G184098: LOFAR follow-up
  87. GRB151212A: Swift/UVOT observations
  88. GRB 151212A: GROND Optical Afterglow Candidate
  89. GRB 151210A: Swift/UVOT Upper Limits
  90. GRB 151210A: Swift-BAT refined analysis
  91. GRB 151210A: Swift-XRT refined Analysis
  92. GRB 151210A: GROND Afterglow Confirmation
  93. GRB 151210A: Swift detection of a burst
  94. GRB 151205A: Khureltogot upper limit
  95. Swift detection of 4U 1850-03
  96. GRB 151205B: Deep GROND Upper limits
  97. GRB 130831A: MASTER early OT detection and LC
  98. GRB 151205B: further Swift-XRT observations
  99. GRB 151205B, Swift-BAT refined analysis
  100. GRB 151205A: Swift-XRT refined Analysis

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