Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28231 results found.

  1. On the Lensing Interpretation of GRB 990123
  2. Search for Potential Images of GRB 990123
  3. Search for Potential Images of GRB 990123
  4. GRB990123, Optical BVRI Observations
  5. GRB 990123: near-infrared observations.
  6. GRB990123, OSSE observations
  7. GRB990123: NIR Observation
  8. GRB990123, ASCA X-ray observation of afterglow
  9. "GRB 990123: New BV Observations"
  10. GRB 990123 Optical Follow-Up
  11. GRB 990123: BATSE Observations
  12. GRB990123 Optical Observations
  13. GRB 990123: New Optical Observations, Decay Measure
  14. GRB 990123 Optical Follow-Up
  15. GRB 990123: Possible Gravitationally Lensed Burst?
  16. GRB990123, optical observation
  17. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  18. GRB990123, Optical observation
  19. GRB 990123: Optical Decay Slope
  20. GRB 990123 r-band photometry
  21. GRB 990123 Optical Follow-up
  22. GRB990123, early optical counterpart detection
  23. GRB990123 Optical Observation
  24. Possible identification of SN1999E with GRB980910
  25. Optical Observations of GRB 981220
  26. GRB 981226: radio variable
  27. GRB981220
  28. GRB981220, Correction to GCN 179
  29. GRB 981220 Optical observations
  30. GRB 981226 Optical Observations
  31. GRB 981220 and GRB 981226, optical observations
  32. GRB981226 Optical Observations
  33. GRB981226 BeppoSAX follow up
  34. GRB 981226
  35. GRB 981226 optical observations
  36. GRB981220 B, R and I band observations
  37. Optical Observations of GRB981226
  38. GRB 981220:Optical Observations
  39. GRB 981226 optical observations
  40. GRB 981220
  41. GRB 981220, radio observations
  42. GRB981220 I-band Observations
  43. GRB 981220
  44. GRB 980326/Host Galaxy
  45. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  46. BeppoSAX NFI Observation of GRB980425
  47. GRB980329 R,I flux calibration and R,I,K upper limits
  48. GRB980425 Optical Follow-up
  49. GRB 980923 BATSE Observations
  50. SGR1900+14, BeppoSAX-GRBM observations
  51. GRB970508 optical observations
  52. GRB971214, association with a Galactic star?
  53. GRB980519, Optical Observations
  54. GRB980703 - BeppoSAX/GRBM detection
  55. GRB980703 optical photometry
  56. GRB 980703: BATSE Observations
  57. GRB980703 optical observations
  58. GRB980703: Radio transient
  59. GRB 980703: Spectrum of the proposed optical counterpart
  60. GRB980703 Transient Optical Follow-Up
  61. GRB980703: LOTIS observation at early times
  62. GRB980613 Optical Observations
  63. GRB980703 (I band observations)
  64. BeppoSAX NFI observations of GRB 980703
  65. GRB980519 observation report
  66. GRB980703 optical followup
  67. Radio observations of SGRs
  68. SGR1900+14 field optical observations
  69. GRB980613, optical observations
  70. GRB 980613: Optical transient and its host galaxy
  71. SGR1627-41, RXTE/ASM observations
  72. GRB 980613: Detection of the probable host galaxy
  73. Reduced error box of SGR 1627-41
  74. GRB 980613: BATSE Observations
  75. GRB 980613 Optical Observations
  76. GRB 980613 optical observations
  77. Discovery of a new SGR source, SGR1627-41
  78. GRB980613 Optical Observations
  79. GRB980613 observations from Palomar
  80. GRB 980613 optical/IR obs.
  81. GRB980613 Near Infra-Red Observations
  82. GRB971214 Secondary Standards
  83. GRB980519 Secondary Standards
  84. BATSE on-board GRB trigger change
  85. GRB 980519 Optical Observations
  86. GRB 980519
  87. GRB980519 optical observations
  88. GRB 980519 Optical Observations
  89. GRB980519 BATSE Observations
  90. GRB980519 Optical Observations
  91. GRB980519 Optical Observations
  92. GRB 980519 Optical Observations
  93. GRB980515, BeppoSAX IAUC to be submitted
  94. BSAX Observations of GRB980425 field
  95. IPN web site of GRBs
  96. GRB980425 BATSE observations
  97. SAX J0840.7+2248 Optical Observations
  98. GRB980425: optical obs.
  99. GRB980425: Radio Observations
  100. report on BSAX observations of GRB980425

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