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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"

5386 results found.

  1. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  2. GRB 180316A: RATIR Optical Observations
  3. GRB 180314A: MITSuME Okayama optical upper limits
  4. GRB180316A: MASTER-IAC OT light curve
  5. GRB180316A: MASTER-IAC optical detection
  6. GRB 180314B: RATIR Optical Observations
  7. GRB 180314B: Zeiss-1000/CrAO optical upper limit
  8. GRB 180314A: MASTER-Net OT dtetction
  9. GRB 180311A: Swift detection of a burst
  10. GRB 180305A: RATIR Optical Observations
  11. GRB 180305A: Mondy optical observations
  12. GRB 180305A: RATIR Optical Afterglow Candidate
  13. GRB180224A: Global MASTER-Net bright OT detection
  14. GRB 180222A: Swift detection of a burst
  15. GRB 180205A: Mondy optical observations
  16. IPN Triangulation of GRB 180218A (long/bright)
  17. GRB 180115A: Swift detection of a burst with an optical counterpart.
  18. GRB 180113A: KAIT Optical Observations
  19. GRB 180102A: MASTER-Net robotic report
  20. GRB 171222A: MASTER-Net OT observations
  21. GRB 171216A: Swift detection of a burst
  22. GRB 171209A: MASTER-Net optical observations
  23. LIGO/Virgo GW170817: X-ray observations confirm prediction made from radio data
  24. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  25. GRB 171123A: OSN Upper Limit
  26. GRB 171112A: MAXI/GSC detection
  27. IceCube-171106A: Swift Observations
  28. GRB 171010A: afterglow and SN 2017htp optical observations
  29. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  30. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  31. GRB 171102B: MITSuME Akeno optical upper limits
  32. IPN Triangulation of GRB 171022A
  33. GRB 171011A: Swift-BAT refined analysis
  34. IPN Triangulation of GRB 171011B (long/very bright)
  35. GRB 171011A: MASTER-SAAO optical observations
  36. GRB 171011A: Swift detection of a burst
  37. LIGO/Virgo G299232: MAGIC Cherenkov Telescopes observations
  38. GRB 171003A: LT early optical observations
  39. LIGO/Virgo G298048: Record of all e-MERLIN results to date on SSS17a
  40. LIGO/VIRGO G298048: Further MeerKAT observations of SSS17a
  41. IceCube-170922A: Swift-XRT observations
  42. IPN Triangulation of GRB 170921B
  43. LIGO/Virgo G298048: SRT observations of SSS17a in NGC 4993
  44. LIGO/Virgo G297595: NIR Observations following GW170814
  45. LIGO/Virgo G298048: AST3-2 observations of SSS17a/DLT17ck from Antarctica
  46. LIGO/Virgo G297595: Las Cumbres Observatory Optical Follow-Up
  47. LIGO/Virgo G299232: Swift-XRT sources
  48. LIGO/Virgo G298048: ATCA observations of of SSS17a in NGC 4993
  49. LIGO/VIRGO G298048: Radio detection of SSS17a at 6 GHz with the VLA
  50. LIGO/Virgo G299232: LOFAR follow-up
  51. GRB 170903A: UAFO /ISON optical upper limit
  52. GRB 170903A: MITSuME Okayama upper limits
  53. GRB 170903A: Nanshan optical upper limit
  54. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  55. GRB 170830A: Fermi GBM observation
  56. GRB 170830A: Astrosat CZTI detection
  57. GRB 170830A: MAXI/GSC detection
  58. LIGO/Virgo G299232: Liverpool Telescope observations
  59. LIGO/Virgo G299232: COATLI Observations of MASTER OT J033744.97+723159.0
  60. LIGO/Virgo G299232 : MAXI/GSC observations
  61. IPN Triangulation of GRB 170826A (short)
  62. LIGO/Virgo G299232 TZAC/TAROT observations
  63. LIGO/Virgo G298936 TAROT/TZAC observations
  64. LIGO/Virgo G298048: MASTER Global-Net early optical observations and the Possible KiloNova SSS17a in NGC 4993 photometry and merging rate
  65. LIGO/Virgo G298936: GWFUNC/CNEOST optical observations and an optical transient
  66. GRB 170823A: Swift detection of a burst
  67. LIGO/Virgo G298048: ATCA 8.5 GHz observations of galaxies in the localisation volume
  68. LIGO/Virgo G298048: TOROS optical counterpart search
  69. LIGO/Virgo G298048: HSC observations of the OT candidate of G298048
  70. GRB 170818A: Fermi GBM detection
  71. LIGO/Virgo G298048: Subaru HSC follow-up observations
  72. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume
  73. LIGO/Virgo G297595: Swift-XRT sources
  74. LIGO/Virgo G297595: MASTER MASTER Bright PSN detection in error-box
  75. LIGO/Virgo G297595: INAF VST-ESO PARANAL observations
  76. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  77. LIGO/Virgo G297595: REM optical/NIR observations
  78. GRB 170810A: VLA Detection
  79. LIGO/Virgo G296853: Liverpool Telescope classification of MASTER OT J013646.48-140323.5
  80. GRB 170810A: Swift/UVOT Detection
  81. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  82. GRB 170808A: MAXI/GSC detection
  83. GRB 170807A: Swift detection of a burst
  84. GRB 170804A: Swift detection of a burst with optical counterpart
  85. Swift Trigger 765783 is not an astrophysical event.
  86. GRB 170728B: time correction to MASTER GCN Circular 21391
  87. Konus-Wind observation of GRB 170728B
  88. GRB 170726A: AstroSat CZTI detection
  89. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  90. GRB 170728B iTelescope observation
  91. GRB 170728A: Swift/UVOT Detection
  92. GRB 170728B: Fermi GBM detection
  93. GRB 170728B: Swift detection of a short burst
  94. GRB 170714A: TNG NIR observations
  95. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  96. GRB 170712A: AstroSat CZTI detection
  97. GRB 170711A: ISON/Terskol and AbAO optical observations
  98. GRB 170711A: Prompt enhanced Swift-XRT position
  99. Correction to GCN Circular 21305: Trigger 760835: Swift misidentification of GRS1716-249
  100. Trigger 760835: Swift misidentification of GRS1716-249

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