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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

3040 results found.

  1. GRB 180703A: Swift/UVOT Upper Limits
  2. GRB 180701A: MAXI/GSC detection
  3. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  4. Konus-Wind observation of GRB 180626B
  5. IPN Triangulation of GRB 180626B (short)
  6. GRB 180624A: Swift-BAT refined analysis
  7. GRB 180624A: MITSuME Okayama optical upper limits
  8. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  9. GRB 180614A: MASTER observation
  10. Konus-Wind observation of GRB 180611A
  11. GRB 180602A: MITSuME Okayama optical upper limits
  12. IPN Triangulation of GRB 180526A (long)
  13. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  14. GRB 180512A: NOT upper limits
  15. GRB 180512A: Swift detection of a burst
  16. Swift trigger 831888: misidentification of 4U 1416-62
  17. GRB 180425A: Swift detection of a burst
  18. GRB 180410A: Fermi GBM observation
  19. GRB 180411A: Swift-BAT refined analysis
  20. GRB 180411A: Swift-XRT refined Analysis
  21. GRB 180411A: Swift detection of a burst
  22. GRB 180404A: Swift detection of a burst with an optical afterglow
  23. GRB 180402A: Swift-XRT refined Analysis
  24. GRB 180402A: KAIT Optical Upper Limit
  25. GRB180314A: GROND detection of the afterglow
  26. GRB 180305A: Fermi-LAT detection
  27. IPN Triangulation of GRB 180223A (long)
  28. GRB 180113A: AstroSat CZTI detection
  29. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  30. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  31. Konus-Wind observation of GRB 180113B
  32. GRB 180116A: MAXI/GSC detection
  33. Konus-Wind observation of GRB 180113A
  34. GRB 180113A: Fermi GBM observation
  35. GRB 180113A: Swift detection of a burst
  36. GRB 180102A: MASTER-Net robotic report
  37. IPN Triangulation of GRB 171216B
  38. GRB 171205A: CHILESCOPE optical observations
  39. GRB 171123A: Swift detection of a burst
  40. GRB 171112A: MAXI/GSC detection
  41. IPN Triangulation of GRB 171108A (short)
  42. GRB 171108A: Fermi GBM detection
  43. GRB 171102B: TShAO optical upper limit
  44. Konus-Wind observation of GRB 171027A
  45. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  46. GRB 171011A: MASTER-SAAO optical observations
  47. GRB 171011A: Swift detection of a burst
  48. LIGO/Virgo G299232: LOFAR follow-up
  49. GRB 170921A: Swift-XRT refined Analysis
  50. LIGO/Virgo G297595: NIR Observations following GW170814
  51. LIGO/Virgo G298048: AST3-2 observations of SSS17a/DLT17ck from Antarctica
  52. GRB 170912B: Swift detection of a burst
  53. LIGO/Virgo G297595: Las Cumbres Observatory Optical Follow-Up
  54. GRB 170906A: Swift/UVOT Detection
  55. LIGO/Virgo G299232: Swift-XRT sources
  56. GRB 170906A: MASTER-OAFA (Argentina) early automatic OT detection
  57. GRB 170906C: Swift-XRT observations
  58. GRB 170906A: Swift detection of a burst with an optical afterglow
  59. LIGO/Virgo G299232: LOFAR follow-up
  60. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  61. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  62. LIGO/Virgo G298048: Chandra monitoring of the X-ray emission from SSS17a
  63. LIGO/Virgo G299232: GRAWITA Asiago optical observations
  64. GRB 170827A: ePESSTO NTT afterglow candidate
  65. LIGO/Virgo G299232: LOFAR follow-up
  66. LIGO/Virgo G297595: INTEGRAL pointed follow-up observations
  67. LIGO/Virgo G299232: FOUND COINCIDENT IceCube neutrino observation
  68. LIGO/Virgo G298936 TAROT/TZAC observations
  69. LIGO/Virgo G298048: MASTER Global-Net early optical observations and the Possible KiloNova SSS17a in NGC 4993 photometry and merging rate
  70. LIGO/Virgo G298048: Near-infrared fading from Gemini-South
  71. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  72. LIGO/Virgo G298936 : Fermi-LAT search for a high-energy gamma-ray counterpart
  73. LIGO/Virgo G298389 : MAXI/GSC observations
  74. LIGO/Virgo G298048: TOROS Spectra observation with CASLEO
  75. LIGO/Virgo G298048: TOROS optical counterpart search (continuation)
  76. GRB 170817B: Insight-HXMT observation
  77. LIGO/Virgo G298048: HSC observations of the OT candidate of G298048
  78. LIGO/Virgo G298048: Observation of the potential optical counterpart in NGC 4993
  79. LIGO/Virgo G298048: REM optical/NIR observations
  80. LIGO/Virgo G298048: Subaru HSC follow-up observations
  81. GRB 170817B: Fermi GBM detection
  82. LIGO/Virgo G298048: Potential optical counterpart discovered by Swope telescope
  83. GRB 170817A: Fermi GBM detection
  84. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  85. LIGO/Virgo G297595: REM optical/NIR observations
  86. GRB 170808A: MAXI/GSC detection
  87. GRB 170804A: Swift/UVOT Detection
  88. GRB 170804A: Enhanced Swift-XRT position
  89. GRB 170804A: Swift detection of a burst with optical counterpart
  90. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  91. GRB 170728B, Swift-BAT refined analysis
  92. GRB 170728B: LT afterglow confirmation
  93. Fermi GBM trigger 522470841/170723116 is not a GRB
  94. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  95. GRB 170711A: ISON/Terskol and AbAO optical observations
  96. GRB 170711A: Prompt enhanced Swift-XRT position
  97. IPN Triangulation of GRB 170708A (short)
  98. GRB 170710A: Swift detection of a burst
  99. GRB 170705A: MASTER-OAFA early OT observations
  100. GRB 170705A: Swift detection of a burst with an optical counterpart

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