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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

68 results found.

  1. Fermi trigger No 723149952: Global MASTER-Net observations report
  2. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  3. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  4. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  5. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  6. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  7. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  8. AXP CXOU J164710.2-455216: Fermi GBM observation
  9. Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
  10. Swift Trigger on AXP CXOU J164710.2-455216
  11. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  12. GRB 150301A: Fermi GBM observation
  13. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  14. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  15. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  16. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  17. GRB 130604A: Swift/UVOT Upper Limits
  18. AXP 4U 1042+61: Mondy optical observations
  19. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  20. Swift detection of an SGR burst from AXP 4U 0142+61
  21. AXP 4U 0142+61: Fermi GBM detection
  22. AXP 4U 0142+61: Swift-BAT refined analysis
  23. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  24. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  25. Swift-BAT refined analysis of trigger 421262
  26. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  27. GRB100316A: Swift/UVOT Upper Limits
  28. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  29. ATCA observation of SGR J1550-5418
  30. Konus-RF catches first GRB and SGR bursts
  31. SGR J1550-5418
  32. Ongoing activity of AXP/SGR 1E1547.0-5408
  33. SGR activity seen by BAT during ICSP Ionospheric Events
  34. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  35. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  36. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  37. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  38. IBAS Alert N. 5442 is not a GRB
  39. Suzaku ToO Observation of AXP 1E 1547.0-5408
  40. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  41. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  42. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  43. 1E1547.0-5408: Swift detection of dust halo
  44. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  45. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  46. Swift-BAT trigger 340734 is not a GRB
  47. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  48. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  49. AXP 1E1547.0-5408: Fermi GBM observations
  50. Trigger 340734: Swift detection of a possible short burst
  51. AXP 1E1547.0-5408 activity with SGR bursts
  52. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  53. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  54. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  55. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  56. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  57. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  58. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  59. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  60. Trigger 330353: Swift detection of a Galactic short soft burst
  61. GRB 071017: a SHORT GRB detected by INTEGRAL
  62. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  63. IPN detection of continued activity from SGR1806-20
  64. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  65. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  66. AXP 1E2259+586: quasi-simultaneous optical observation
  67. AXP 1E2259+586 optical observations
  68. SGR-like Bursts from the AXP 1E 2259+586

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