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"

4254 results found.

  1. GRB 021112: RAPTOR Observations
  2. GRB021112 (=H2448): A Long GRB Localized by HETE
  3. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  4. SGR1900+14 activity, November 2-4, 2002
  5. Detection of activity from SGR 1900+14 with the RXTE/PCA
  6. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  7. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  8. IPN triangulation of GRB021020 (smaller error box)
  9. IPN triangulation of GRB021020
  10. GRB021016(=H2397): A Long GRB Localized by HETE
  11. IPN triangulation of GRB021013 (two small error boxes)
  12. GRB021004: BVRc photometry
  13. GRB 021004: Optical Observations
  14. IPN triangulation of GRB020914
  15. IPN detection of a burst from SGR1900+14
  16. IPN triangulation of GRB020715 (=GRB150702)
  17. IPN triangulation of GRB150702
  18. IPN triangulation of GRB020708
  19. IPN triangulation of GRB020708
  20. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  21. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  22. AXP 1E2259+586: quasi-simultaneous optical observation
  23. AXP 1E2259+586 optical observations
  24. SGR-like Bursts from the AXP 1E 2259+586
  25. GRB 020604, optical observations
  26. GRB020604, optical observations
  27. IPN triangulation of GRB020604
  28. GRB020531: Optical observations
  29. GRB020525, optical observations
  30. IPN detection of possible bursts from SGR1806-20
  31. IPN triangulation of GRB020525
  32. XRF 020427: Sudden Ionospheric Disturbance (SID)
  33. Mars Odyssey joins the IPN
  34. Short RXTE/ASM transient 020406; may be a GRB
  35. XRF/GRB 011030: Detection of the Probable Host Galaxy
  36. IPN detection and localization of Cygnus X-1 flares
  37. RXTE Observations of SGR 1900+14
  38. SGR1900+14 activity
  39. IPN/HETE Detection of Bursts from SGR1900+14
  40. IPN Upper Limits to a GRB Associated With SN2002ap
  41. IPN detection of further activity from SGR1806-20
  42. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  43. GRB010923 as seen by BeppoSAX GRBM
  44. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  45. Probable SGR or Short Duration GRB Detected by HETE
  46. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  47. GRB 010629 Optical Observations
  48. GRB010629: A Burst Localized by HETE
  49. Possible burst from SGR1806-20
  50. IPN detection of SGR1900+14
  51. X-ray precursors to the large flare from SGR 1900+14
  52. SGR 1900+14: No evidence of extended X-ray emission
  53. SGR 1900+14 : RXTE observations
  54. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  55. SGR1900+14
  56. SGR 1900+14: Correction to GCN 1049
  57. Millimeter observation of SGR 1900+14
  58. SGR 1900+14: Detection of extended X-ray emission
  59. Chandra Observations of SGR 1900+14
  60. SGR 1900+14, Chandra observations
  61. Chandra Observations of SGR 1900+14
  62. SGR1900+14, I-band observations
  63. GRB 980326: Late-time HST/STIS observations
  64. GRB 010214, I-band data
  65. GRB010214 Optical Observation
  66. GRB010126 optical observations
  67. Optical Observations of GRB 001018 at Keck
  68. IPN triangulation of GRB001219
  69. GRB 001109: deep JHK upper limits
  70. IPN TRIANGULATION OF GRB001105
  71. IPN TRIANGULATION OF GRB001020
  72. GRB 000926 Chandra Observation
  73. GRB000926 K'-band Observation
  74. HST/STIS observations of the host galaxy of GRB 980329
  75. SGR 1806-20 burst activity
  76. IPN localization of GRB000730B
  77. IPN localization of GRB000730B
  78. GRB 990510: Possible detection of a host galaxy
  79. GRB 990510 Host Galaxy Discovery
  80. GRB 990712: Late time HST/STIS Observations
  81. GRB 000630: Detection of the Optical Afterglow
  82. GRB000616 [IPN Position]
  83. GRB 000418: Detection of the Host Galaxy
  84. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  85. GRB000529: BeppoSAX WFC position
  86. GRB000528: BeppoSAX GRBM observations
  87. GRB000419 [IPN Position]
  88. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  89. GRB 000326: Optical Observations
  90. GRB 000301C, Optical Observation
  91. GRB000301C
  92. GRB 000301C : Optical Candidate
  93. GRB000226 [IPN Position]
  94. HST Observations of GRB 990712
  95. IPN annulus for GRB000214
  96. GRB000126, optical observations
  97. IPN localization of GRB000126
  98. GRB991216 late optical observation
  99. BEPPOSAX GRBM Localization of GRB991226
  100. IPN error boxes for GRB991229

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