Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

892 results found.

  1. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  2. GRB 090417A: Early-type nature of the putative host
  3. GRB 090417A: nearby galaxy redshift
  4. SGR J1550-5418: two Fermi GBM triggers on March 22
  5. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  6. ATCA observation of SGR J1550-5418
  7. GRB 090303: Fermi GBM detection
  8. Konus-RF catches first GRB and SGR bursts
  9. SGR J1550-5418
  10. Ongoing activity of AXP/SGR 1E1547.0-5408
  11. SGR activity seen by BAT during ICSP Ionospheric Events
  12. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  13. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  14. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  15. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  16. IBAS Alert N. 5442 is not a GRB
  17. Suzaku ToO Observation of AXP 1E 1547.0-5408
  18. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  19. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  20. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  21. Trigger 340734: Swift detection of a possible short burst
  22. AXP 1E1547.0-5408 activity with SGR bursts
  23. GRB 090111: Swift UVOT Upper Limits
  24. GRB 081222: Swift XRT refined analysis
  25. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  26. SGR 1806-20: Fermi GBM detection.
  27. SGR 1806-20: Fermi GBM detection
  28. SGR 0501+4516: optical observations in August
  29. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  30. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  31. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  32. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  33. GRB 081024: Swift detection of a burst
  34. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  35. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  36. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  37. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  38. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  39. Trigger 330353: Swift detection of a Galactic short soft burst
  40. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  41. SGR 0501+4516 : P200 i-band observations
  42. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  43. Recent VLA non-detection of SGR 0501+4516
  44. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  45. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  46. nIR observations of SGR 0501+4516
  47. INTEGRAL ToO observation of SGR0501+4516
  48. SGR 0501+4516: Confirmation of the NIR counterpart
  49. SGR 0501+4516: Detection of possible optical counterpart
  50. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  51. VLA non-detection of SGR 0501+4516
  52. Radio Detection of SGR 0501+4516: Retraction
  53. SGR 0501+4516: XMM-Newton monitoring schedule
  54. SGR 0501+4516: Decline in Activity
  55. SGR 0501+4516: Proximity to supernova remnant HB9
  56. Enhanced Swift-XRT position of SGR 0501+4516
  57. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  58. SGR 0501+4516: Swift XRT measure of the spin period
  59. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  60. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  61. Suzaku ToO Observation of SGR 0501+4516
  62. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  63. Konus-Wind observations of new SGR 0501+4516
  64. INTEGRAL ToO Observation of SGR0501+4516
  65. Radio Detection of SGR 0501+4516
  66. SGR 0501+4516: MDM Optical Observations
  67. SGR 0501+4516: Astrotel-Caucasus optical observations
  68. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  69. SGR 0501+4516: WSRT Radio Observations
  70. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  71. SGR 0501+4516: optical observations
  72. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  73. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  74. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  75. GRB080818B: GLAST Burst Monitor detection
  76. Third event from SGR 0501+4516
  77. GRB 080822 (SGR 0501+4516): archival optical observations
  78. New Soft Gamma Repeater 0501+4516 was GRB 080822
  79. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  80. Konus-Wind observation of reactivation of SGR 1627-41
  81. Reactivation of SGR 1627-41
  82. GRB 080520: Swift XRT Refined Analysis
  83. GRB 080205: Swift XRT refined analysis
  84. GRB 080121: Upper limit on X-ray afterglow
  85. GRB080120: Swift XRT position
  86. Disregard the "GRB 071126" position
  87. Swift XRT follow-up observations of GRB071008
  88. GRB 071017: a SHORT GRB detected by INTEGRAL
  89. GRB 071003: XRT refined analysis
  90. INTEGRAL ToO observations of SGR1806-20
  91. SGR1806-20: Swift-BAT detection of enhanced activity
  92. Intense burst from SGR 1806-20 detected on September 7
  93. Swift detection of a outburst from SAX J1810.8-2609
  94. AGILE-ACS position for the SGR 1806-20 July 27 burst
  95. Intense burst from SGR 1806-20 detected on July 27
  96. GRB 070729: Swift-XRT refined analysis
  97. GRB 070520B: Swift-XRT refined analysis
  98. GRB 070520A: Swift-XRT refined analysis
  99. Suzaku ToO observation of SGR 1806-20
  100. INTEGRAL ToO Observation of SGR1806-20

Advanced

Download all Circulars as a .tar.gz archive:
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