Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

4904 results found.

  1. GRB030329, SPM optical observations
  2. GRB 030329, the review of the sky area in plate archive (1950-1998)
  3. GRB 030329: Spectral Evolution of SN 2003dh
  4. GRB030329: VR Photometry at TNG
  5. GRB030324: Candidate Optical Afterglow
  6. IPN triangulation of GRB050403 (small error box)
  7. GRB030329: final R-band light curve by MASTER
  8. GRB 030329, BRI photometry
  9. GRB 030329: Additional Mt. Laguna Optical Observations
  10. GRB 030329: Correction to GCN 2056
  11. GRB 030329: fitting parameters and re-brightening
  12. GRB 030329: optical observations
  13. GRB 030324, optical search
  14. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  15. GRB030324 optical observation
  16. Possible GRB030323 localized by INTEGRAL
  17. GRB030323: Detection on 2003/03/24
  18. IPN triangulation of GRB030325 (single small error box)
  19. GRB030324, optical observations
  20. GRB030324, optical observations
  21. GRB030324, Optical Observations
  22. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  23. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  24. VLT/FORS2 spectra of GRB 030323
  25. GRB030323, ROTSE-III detection of possible optical counterpart
  26. GRB030323, optical observations
  27. IPN triangulation of GRB030320
  28. GRB 030227: Optical limit at RIKEN
  29. GRB 030227: Optical observations
  30. GRB030227: Kiso optical upper limit
  31. GRB 030226: Steep Decline
  32. GRB030226: Candidate optical afterglow
  33. IPN triangulation of GRB030208 (annulus)
  34. GRB 030131: afterglow candidate
  35. GRB 030115, simultaneous observations by BOOTES-1
  36. IPN triangulation of GRB030101 (two large error boxes)
  37. GRB 021211: Probable Host and Underlying Supernova
  38. IPN triangulation of GRB021219 - CORRECTION
  39. GRB 021211: CTIO observations
  40. GRB 021211: Optical Observations
  41. Chandra observation of the IPN error box of GRB021201 (short/hard)
  42. IPN detection of continued SGR1900+14 activity
  43. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  44. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  45. IPN triangulation of GRB021023 (small error boc)
  46. IPN triangulation of GRB021013 (single error box)
  47. IPN triangulation of GRB021013 (two small error boxes)
  48. GRB021004: NIR and Optical observations
  49. GRB021004: BVRc photometry
  50. GRB021004, Optical Observations
  51. GRB 021004: Optical Photometry at 1.5 Days
  52. GRB 021004, SPM optical observations
  53. GRB 021004: steepening of the optical decay slope
  54. GRB021004: Upper limits from recent and historical observations
  55. XRF 020903: Supernova
  56. IPN annulus for GRB020923
  57. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  58. INTEGRAL GRBs added to GCN
  59. GRB 020812: early time optical observation at Ouda Station
  60. GRB020813: optical and NIR observations
  61. GRB 020813: addendum to GCN 1498
  62. GRB020812: NIR observations
  63. GRB020813, optical observations
  64. Further refinement to IPN error box for GRB020531
  65. GRB020625 (=H2081): A Long Burst Localized by HETE
  66. GRB020531: Second epoch Chandra observations
  67. GRB020531 Optical observations with TAROT
  68. GRB020531: Observations with the Chandra X-ray Observatory
  69. Refined IPN error box for GRB020531
  70. IPN triangulation of the short, hard GRB020531 (=H2042)
  71. GRB020321 : Optical observations.
  72. GRB 020124: Optical observations
  73. GRB 020409: Optical observations
  74. GRB 020409: No Evidence for an Optical Afterglow
  75. GRB 020331 Kyoto observation on March 31
  76. GRB 020409
  77. GRB020124 optical observations with RIBOTS/RIMOTS
  78. Short RXTE/ASM transient 020406; may be a GRB
  79. GRB 020321, Radio Observations
  80. GRB 020321: Optical observations
  81. GRB 020322 optical observations
  82. GRB020317 : Near IR Observations from Mt Abu Observatory
  83. GRB 020317 : KISO Optical Observations
  84. GRB 020317: Optical observations
  85. GRB011130 (XRF011130) Second Epoch Chandra Observations
  86. IPN detection and localization of Cygnus X-1 flares
  87. IPN Upper Limits to a GRB Associated With SN2002ap
  88. GRB020124: Optical observations
  89. GRB 020124: Optical observations
  90. GRB020124(=H1896): Localization of a Long GRB by HETE
  91. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  92. GRB 011121
  93. GRB011030, optical observation
  94. GRB010923 as seen by BeppoSAX GRBM
  95. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  96. GRB001109, Host Galaxy Astrometry
  97. GRB000926, Host Galaxy Observations
  98. GRB001109, Host Galaxy Spectroscopic Observations
  99. BeppoSAX/GRBM detection of GRB010728
  100. SGR1900+14: Second Burst Localized by HETE

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