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"

27321 results found.

  1. IPN triangulation of GRB030101 (two large error boxes)
  2. GRB 021211: Probable Host and Underlying Supernova
  3. GRB 021112: Evidence for Another Dark Optical Afterglow
  4. GRB 021219: OSN optical observations
  5. GRB021219, optical observations
  6. GRB021219, optical observation by MASTER
  7. VLT spectra of GRB 021211 revisited
  8. GRB021219: a long GRB localized by INTEGRAL
  9. GRB021211: APO optical observations
  10. XRF 020903 : HST observations
  11. GRB 021201: Optical Observations
  12. GRB 021211: CTIO observations
  13. GRB021211, BVRI field photometry
  14. GRB021211: Optical observations in CrAO
  15. GRB 021211, optical observations
  16. GRB021211: Kiso Observations
  17. GRB 021201, optical observations
  18. GRB021211: Optical observations
  19. GRB 021201 (short/hard), NOT observations
  20. SUB-MM SEARCH FOR GRB 021211
  21. Chandra observation of the IPN error box of GRB021201 (short/hard)
  22. GRB 021211, R- and I-band observations
  23. GRB021211 - Upper limits from recent and historical observations
  24. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  25. IPN triangulation of GRB021206 (small error box)
  26. IPN triangulation of GRB021205 (large error box)
  27. GRB021201, BVRcIc field photometry
  28. GRB 021201: BOOTES simultaneous optical observations
  29. IPN triangulation of GRB021201 (short/hard burst, small error box)
  30. GRB021004, late time optical observations
  31. GRB021004 Chandra Observation
  32. IPN detection of continued SGR1900+14 activity
  33. Improved IPN error box for GRB021125
  34. IPN BURST POSITION
  35. IPN triangulation of GRB021125 (INTEGRAL BURST)
  36. GRB021125 : A long GRB localized by INTEGRAL
  37. IPN confirmation of the reactivation of SGR1900+14
  38. GRB021113, SPI ACS observation
  39. GRB 021112: Afterglow or Variable Star?
  40. GRB021113: optical observations at Bisei
  41. GRB 021113: Evidence for a Dark Optical Afterglow
  42. GRB021112, BVRI field photometry
  43. GRB 021112: Variable Source in R-band search
  44. GRB021112: Optical Observations
  45. IPN triangulation of GRB021113 (=H2449; annulus)
  46. GRB 021113: Optical observations
  47. GRB 021112: RAPTOR Observations
  48. GRB021113 (=H2449): A Long GRB Localized by HETE
  49. GRB021112 (=H2448): A Long GRB Localized by HETE
  50. GRB 021016: Optical Observations
  51. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  52. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  53. SGR1900+14 activity, November 2-4, 2002
  54. GRB021104: optical observations
  55. Detection of activity from SGR 1900+14 with the RXTE/PCA
  56. IPN triangulation of GRB021027 (single large error box)
  57. IPN triangulation of GRB021027 (two large error boxes)
  58. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  59. GRB 021004: optical observations
  60. IPN triangulation of GRB021023 (small error boc)
  61. GRB 020813; likely host galaxy.
  62. IPN triangulation of GRB021020 (smaller error box)
  63. IPN triangulation of GRB021020
  64. GRB 021008, optical observations
  65. IPN triangulation of GRB021016 (small error box)
  66. IPN triangulation of GRB021014 (large error box)
  67. IPN triangulation of GRB021013 (single error box)
  68. GRB 021004: optical spectroscopy on Oct 11
  69. IPN triangulation of GRB021013 (two small error boxes)
  70. GRB021004: High-resolution optical spectroscopy
  71. XRF 020903: flattening of the optical light curve.
  72. GRB021004, UBVRcIc field photometry update
  73. IPN triangulation of GRB021008 (single error box)
  74. GRB 021004 submm observations
  75. IPN triangulation of GRB021008 (two small error boxes)
  76. GRB021004 Chandra HETG Observations
  77. GRB 021004: Optical/NIR Observations
  78. GRB 021004: Additional V-band Polarimetric Observations
  79. GRB021004: optical observation
  80. GRB 021004: Host Galaxy Star Formation Rate
  81. GRB 021004 submm observations
  82. GRB 021004: WC wind?
  83. GRB021004: NIR and Optical observations
  84. GRB 021004: Optical observations, AUDE network
  85. GRB 021004 - VLA Radio Observations
  86. GRB 021004 - Unusual Radio-to-Submm Spectrum
  87. GRB 021004: optical spectroscopy
  88. IPN triangulation of GRB021007 (annulus)
  89. GRB021004: optical observations and predicted break time
  90. GRB021004: BVRc photometry
  91. GRB021004 radio observation
  92. HETE fluences for GRB021004
  93. GRB 021004: Optical Photometry at 2.5 Days
  94. GRB 021004: polarimetric observations
  95. GRB 021004: V-band Polarimetric Observations
  96. GRB021004: Update Bisei photometric data
  97. IRAM Millimeter detection of GRB 021004
  98. GRB 021004 radio observation
  99. GRB 021004: Optical Photometry at 1.5 Days
  100. GRB021004, BVRcIc field photometry

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