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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"

3735 results found.

  1. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  2. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  3. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  4. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  5. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  6. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  7. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  8. GRB 110328A: Swift detection of a burst
  9. GRB 110319B Swift-XRT afterglow confirmation
  10. GRB 110319A: Swift-BAT refined analysis
  11. GRB 110318A: Swift-BAT refined analysis
  12. GRB 110315A: Swift-BAT refined analysis
  13. GRB 110315A: Swift detection of a burst
  14. GRB 110312A: GROND Upper Limits
  15. GRB110305A: MITSuME Ishigakijima Optical upper limits
  16. GRB 110213B: Swift/UVOT observations
  17. GRB110213B: X-ray afterglow confirmation
  18. Swift XRT and UVOT Observations of OT 110215
  19. GRB 110213B: P60 Optical Afterglow Candidate
  20. GRB 110213B: Swift XRT observation
  21. Konus-Wind observation of GRB 110213B
  22. GRB 110213B: MAXI/GSC refined analysis
  23. GRB 110213B: MAXI/GSC detection of a probable GRB
  24. GRB 110212A, Swift-BAT refined analysis
  25. SGR-like outburst from the magnetar 1E 1841-04.5
  26. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  27. GRB 110206A: TAROT La Silla observatory optical observations
  28. GRB 101112A: Maidanak and CrAO optical observations
  29. GRB 110128A: Afterglow detection from NOT
  30. IPN triangulation of GRB 110120A
  31. New feature in Fermi GBM GRB Ground Position Notices
  32. GRB 110106B: MASTER optical observations
  33. Short GRB 110106A: MASTER OT observations
  34. Konus-Wind observation of GRB 110102A
  35. GRB 101225A: MAXI/GSC observations
  36. Trigger 441015 / GRB 101225A: Further NOT optical observation
  37. GRB 101224A, Swift-BAT refined analysis
  38. XRF 101117A, RIMOTS optical upper limits
  39. Swift detection of MAXIJ1409-619
  40. GRB 101123A: Fermi GBM detection
  41. XRF 101117A: Palomar Transient Factory Observations
  42. GRB 101117B: Swift-BAT refined analysis
  43. XRF101117A: MAXI/GSC detection of a short X-ray transient
  44. GRB 101112A: optical observations
  45. GRB 101030A: Swift detection of a burst
  46. Konus-Wind observation of GRB 101023A
  47. GRB 101024A: Swift-BAT refined analysis
  48. GRB 101023A: Swift-BAT refined analysis
  49. GRB 101008A: optical observations
  50. GRB 100925A / MAXI J1659-152: MASTER optical observations
  51. GRB 100924A: Fermi GBM observation
  52. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  53. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  54. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  55. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  56. GRB 100925A / MAXI J1659-152: SARA-S Observations
  57. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  58. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  59. GRB 100925A/MAXI J1659-152 - NOT optical observations
  60. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  61. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  62. GRB 100915A: Swift-BAT refined analysis
  63. GRB100906A: R band observations
  64. GRB 100901A: ISON-NM optical observations
  65. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  66. GRB 100902A: MASTER Prompt Optical Observations
  67. GRB100901A: MITSuME Okayama Optical Observation
  68. GRB 100823A: MAXI/GSC detection
  69. GRB 100816A, Swift-BAT refined analysis
  70. GRB 100814A: CQUEAN r- and i-band Observation
  71. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  72. GRB 100805A: optical observation in CrAO
  73. Trigger 430975: Swift detection of a possible burst
  74. GRB 100725B: Swift-BAT refined analysis
  75. GRB 100725B: Enhanced Swift-XRT position
  76. GRB 100725B: Swift detection of a burst
  77. GRB 100719A: Swift-BAT refined analysis
  78. GRB 100719A: Swift detection of a burst
  79. Konus-Wind observation of GRB 100707A
  80. XRF 100701A : MAXI/GSC detection of a probable XRF
  81. GRB 100628A: Swift-BAT refined analysis
  82. GRB 100625A: Swift detection of a short hard burst
  83. Konus-Wind observation of GRB 100621A
  84. XRF 100616a : MAXI/GSC detection of a probable XRF
  85. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  86. GRB 100513A: CrAO optical observations
  87. GRB 100514A: Faulkes Telescope South observations
  88. GRB 100510A: Fermi GBM detection/observation
  89. GRB 100510A: MAXI/GSC detection
  90. GRB 100420A: Gemini discovery of infrared afterglow
  91. Konus-Wind observation of GRB 100423A
  92. GRB 100424A: CrAO optical observations
  93. GRB 100424A: Gemini/NIRI Candidate Afterglow
  94. GRB 100415A: MAXI/GSC detection of a probable GRB
  95. GRB 100413A: SARA upper limit
  96. Konus-Wind observation of GRB 100324B
  97. Short X-ray Transient detected by MAXI/GSC
  98. GRB 100322A: Suzaku WAM observation of the prompt emission
  99. Swift-BAT refined analysis of the probable new SGR 1833-0832
  100. XRF 100315A: MAXI/GSC detection of a short X-ray transient

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