Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

900 results found.

  1. GRB 100316D: Pre-burst emission measured by BAT
  2. Swift Trigger #382159 is due to XTE J1752-223
  3. GRB 090709A: Quasiperiodic variations in the BAT light curve
  4. XRF 090702: Swift-XRT refined analysis
  5. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  6. RXTE Discovery of Pulsations from SGR 0418+5729
  7. Konus-RF observation of SGR burst 090605A
  8. Discovery of a new soft gamma repeater source, SGR 0418+5729
  9. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  10. GRB 090417A: Early-type nature of the putative host
  11. GRB 090417A: nearby galaxy redshift
  12. SGR J1550-5418: two Fermi GBM triggers on March 22
  13. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  14. ATCA observation of SGR J1550-5418
  15. GRB 090303: Fermi GBM detection
  16. Konus-RF catches first GRB and SGR bursts
  17. SGR J1550-5418
  18. Ongoing activity of AXP/SGR 1E1547.0-5408
  19. SGR activity seen by BAT during ICSP Ionospheric Events
  20. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  21. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  22. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  23. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  24. IBAS Alert N. 5442 is not a GRB
  25. Suzaku ToO Observation of AXP 1E 1547.0-5408
  26. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  27. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  28. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  29. Trigger 340734: Swift detection of a possible short burst
  30. AXP 1E1547.0-5408 activity with SGR bursts
  31. GRB 090111: Swift UVOT Upper Limits
  32. GRB 081222: Swift XRT refined analysis
  33. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  34. SGR 1806-20: Fermi GBM detection.
  35. SGR 1806-20: Fermi GBM detection
  36. SGR 0501+4516: optical observations in August
  37. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  38. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  39. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  40. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  41. GRB 081024: Swift detection of a burst
  42. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  43. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  44. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  45. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  46. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  47. Trigger 330353: Swift detection of a Galactic short soft burst
  48. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  49. SGR 0501+4516 : P200 i-band observations
  50. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  51. Recent VLA non-detection of SGR 0501+4516
  52. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  53. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  54. nIR observations of SGR 0501+4516
  55. INTEGRAL ToO observation of SGR0501+4516
  56. SGR 0501+4516: Confirmation of the NIR counterpart
  57. SGR 0501+4516: Detection of possible optical counterpart
  58. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  59. VLA non-detection of SGR 0501+4516
  60. Radio Detection of SGR 0501+4516: Retraction
  61. SGR 0501+4516: XMM-Newton monitoring schedule
  62. SGR 0501+4516: Decline in Activity
  63. SGR 0501+4516: Proximity to supernova remnant HB9
  64. Enhanced Swift-XRT position of SGR 0501+4516
  65. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  66. SGR 0501+4516: Swift XRT measure of the spin period
  67. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  68. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  69. Suzaku ToO Observation of SGR 0501+4516
  70. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  71. Konus-Wind observations of new SGR 0501+4516
  72. INTEGRAL ToO Observation of SGR0501+4516
  73. Radio Detection of SGR 0501+4516
  74. SGR 0501+4516: MDM Optical Observations
  75. SGR 0501+4516: Astrotel-Caucasus optical observations
  76. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  77. SGR 0501+4516: WSRT Radio Observations
  78. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  79. SGR 0501+4516: optical observations
  80. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  81. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  82. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  83. GRB080818B: GLAST Burst Monitor detection
  84. Third event from SGR 0501+4516
  85. GRB 080822 (SGR 0501+4516): archival optical observations
  86. New Soft Gamma Repeater 0501+4516 was GRB 080822
  87. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  88. Konus-Wind observation of reactivation of SGR 1627-41
  89. Reactivation of SGR 1627-41
  90. GRB 080520: Swift XRT Refined Analysis
  91. GRB 080205: Swift XRT refined analysis
  92. GRB 080121: Upper limit on X-ray afterglow
  93. GRB080120: Swift XRT position
  94. Disregard the "GRB 071126" position
  95. Swift XRT follow-up observations of GRB071008
  96. GRB 071017: a SHORT GRB detected by INTEGRAL
  97. GRB 071003: XRT refined analysis
  98. INTEGRAL ToO observations of SGR1806-20
  99. SGR1806-20: Swift-BAT detection of enhanced activity
  100. Intense burst from SGR 1806-20 detected on September 7

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov