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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"

675 results found.

  1. GRB 100319A: Swift detection of a burst; possible SGR
  2. Swift Trigger #382159 is due to XTE J1752-223
  3. GRB 090926B: Swift detection of a burst
  4. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  5. RXTE Discovery of Pulsations from SGR 0418+5729
  6. Konus-RF observation of SGR burst 090605A
  7. Discovery of a new soft gamma repeater source, SGR 0418+5729
  8. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  9. GRB 090417A: Early-type nature of the putative host
  10. GRB 090417A: nearby galaxy redshift
  11. SGR J1550-5418: two Fermi GBM triggers on March 22
  12. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  13. ATCA observation of SGR J1550-5418
  14. GRB 090303: Fermi GBM detection
  15. Konus-RF catches first GRB and SGR bursts
  16. SGR J1550-5418
  17. Ongoing activity of AXP/SGR 1E1547.0-5408
  18. SGR activity seen by BAT during ICSP Ionospheric Events
  19. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  20. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  21. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  22. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  23. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  24. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  25. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  26. Trigger 340734: Swift detection of a possible short burst
  27. AXP 1E1547.0-5408 activity with SGR bursts
  28. GRB 081222: Gemini-South absorption redshift
  29. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  30. SGR 1806-20: Fermi GBM detection.
  31. SGR 1806-20: Fermi GBM detection
  32. SGR 0501+4516: optical observations in August
  33. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  34. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  35. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  36. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  37. GRB 081029: Redshift Confirmation from Gemini-South
  38. GRB 081024: Swift detection of a burst
  39. GRB 081016B: Swift detection of a burst
  40. GRB 081008: Gemini-South Absorption Redshiftt
  41. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  42. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  43. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  44. Trigger 330353: Swift detection of a Galactic short soft burst
  45. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  46. SGR 0501+4516 : P200 i-band observations
  47. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  48. Recent VLA non-detection of SGR 0501+4516
  49. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  50. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  51. nIR observations of SGR 0501+4516
  52. INTEGRAL ToO observation of SGR0501+4516
  53. SGR 0501+4516: Confirmation of the NIR counterpart
  54. SGR 0501+4516: Detection of possible optical counterpart
  55. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  56. VLA non-detection of SGR 0501+4516
  57. Radio Detection of SGR 0501+4516: Retraction
  58. SGR 0501+4516: XMM-Newton monitoring schedule
  59. SGR 0501+4516: Decline in Activity
  60. SGR 0501+4516: Proximity to supernova remnant HB9
  61. Enhanced Swift-XRT position of SGR 0501+4516
  62. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  63. SGR 0501+4516: Swift XRT measure of the spin period
  64. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  65. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  66. Suzaku ToO Observation of SGR 0501+4516
  67. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  68. Konus-Wind observations of new SGR 0501+4516
  69. INTEGRAL ToO Observation of SGR0501+4516
  70. Radio Detection of SGR 0501+4516
  71. SGR 0501+4516: MDM Optical Observations
  72. SGR 0501+4516: Astrotel-Caucasus optical observations
  73. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  74. SGR 0501+4516: WSRT Radio Observations
  75. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  76. SGR 0501+4516: optical observations
  77. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  78. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  79. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  80. Third event from SGR 0501+4516
  81. GRB 080822 (SGR 0501+4516): archival optical observations
  82. New Soft Gamma Repeater 0501+4516 was GRB 080822
  83. Konus-Wind observation of GRB 080607
  84. GRB 080607: Swift-XRT refined analysis
  85. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  86. Konus-Wind observation of reactivation of SGR 1627-41
  87. Reactivation of SGR 1627-41
  88. GRB 080411: Continued Swift Monitoring
  89. Disregard the "GRB 071126" position
  90. GRB 071017: a SHORT GRB detected by INTEGRAL
  91. GRB 071011: XRT afterglow detection
  92. INTEGRAL ToO observations of SGR1806-20
  93. SGR1806-20: Swift-BAT detection of enhanced activity
  94. Intense burst from SGR 1806-20 detected on September 7
  95. Swift detection of a outburst from SAX J1810.8-2609
  96. AGILE-ACS position for the SGR 1806-20 July 27 burst
  97. Intense burst from SGR 1806-20 detected on July 27
  98. Suzaku ToO observation of SGR 1806-20
  99. INTEGRAL ToO Observation of SGR1806-20
  100. long burst from SGR 1806-20 detected on March 26

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