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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').
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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.

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

95 results found.

  1. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  2. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  3. LIGO/Virgo G298048: Brightening X-ray Emission from GW170817/GRB170817A/SSS17a
  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. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  14. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  15. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  16. AXP 4U 1042+61: Mondy optical observations
  17. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  18. Swift detection of an SGR burst from AXP 4U 0142+61
  19. Swift detection of short bursts from PSR J1647-4552
  20. SGR J1834.9-0846: A Neutron Star in W41?
  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. GRB 091117: Chandra Observations
  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. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  36. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  37. IBAS Alert N. 5442 is not a GRB
  38. Suzaku ToO Observation of AXP 1E 1547.0-5408
  39. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  40. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  41. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  42. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  43. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  44. Swift-BAT trigger 340734 is not a GRB
  45. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  46. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  47. AXP 1E1547.0-5408: Fermi GBM observations
  48. Trigger 340734: Swift detection of a possible short burst
  49. AXP 1E1547.0-5408 activity with SGR bursts
  50. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  51. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  52. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  53. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  54. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  55. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  56. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  57. Trigger 330353: Swift detection of a Galactic short soft burst
  58. GRB 071017: a SHORT GRB detected by INTEGRAL
  59. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  60. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  61. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  62. XRF040701: Optical Observations at ESO
  63. XRF040701: VLA Observations
  64. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  65. XRF040701: First-Epoch Chandra Observations
  66. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  67. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  68. IPN detection of continued activity from SGR1806-20
  69. XRF030723(=H2777): Chandra Observations
  70. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  71. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  72. GRB 030528: Optical Observations
  73. GRB 030528: tentative NIR counterpart
  74. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  75. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  76. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  77. AXP 1E2259+586: quasi-simultaneous optical observation
  78. AXP 1E2259+586 optical observations
  79. SGR-like Bursts from the AXP 1E 2259+586
  80. GRB 020531/Candidate Redshift
  81. GRB020531: Detection of Candidate Host Galaxy
  82. GRB020531: Second epoch Chandra observations
  83. GRB020531 Optical observations with TAROT
  84. GRB020531 Optical observations with TAROT
  85. GRB020531: Observations with the Chandra X-ray Observatory
  86. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  87. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  88. GRB 020321: Candidate X-ray Counterparts
  89. GRB011130 (XRF011130) Second Epoch Chandra Observations
  90. GRB 011130: Optical Observations of X-ray and Radio Sources
  91. GRB 011130, Radio/X-ray Comparison
  92. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  93. GRB 011130: Optical Observations of Chandra Sources
  94. GRB 011130: Optical Observations of Chandra sources
  95. GRB011130 (XRF011130) Chandra Observations

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