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"

16200 results found.

  1. GRB041006 (=HETE3570): optical observations
  2. ROTSE-IIIa Observations of GRB 041006
  3. GRB041006, optical observation
  4. GRB041006: MASTER optical observations
  5. GRB041006,optical observation
  6. GRB 041006: Optical decay
  7. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  8. GRB041006: Fading of optical afterglow candidate
  9. GRB 041006 : Optical follow-up observation at KISO
  10. GRB 041006: Finding chart
  11. GRB 041006: Optical afterglow candidate
  12. GRB 040924: Second Epoch WSRT Radio Observations
  13. radio observations, GRB 040924
  14. GRB040929,optical observation
  15. GRB040929: MASTER optical observations
  16. GRB040924,optical observation
  17. GRB040924, RTT150 optical observation
  18. GRB040924,optical observation
  19. GRB040924, RTT150 optical observation
  20. GRB040924: Afterglow magnitude at t=17.5hr
  21. GRB 040924: WSRT Radio Observations
  22. GRB040924 : Optical candidate observations at Lulin observatory
  23. GRB040924 : Optical candidate observations at Lulin observatory
  24. GRB 040924: Subaru NIR observation
  25. GRB040924: Optical afterglow properties
  26. GRB 040924: RTT150 optical observations
  27. GRB 040924, optical follow-up
  28. GRB040924: MASTER: OT decay
  29. GRB040924: MASTER Optical observations
  30. IPN triangulation of GRB040924 (H3564)
  31. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  32. GRB040924 (H3564): Optical afterglow candidate
  33. XRF 040916: Radio Observations
  34. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  35. XRF040916: continuing decay of OT
  36. GRB040912(=H3557): Candidate Optical Afterglow
  37. XRF040916, optical observations
  38. XRF040916: Optical Transient Candidate by Subaru
  39. GRB040916 optical limits 17 min after GRB
  40. XRF 040912, identification of CXO sources
  41. XRF 040912 (=H3557): Spectral and Temporal Properties
  42. XRF040916: optical follow-up observations
  43. GRB040916: Archival optical observations
  44. XRF 040916, optical follow-up
  45. GRB040916: Optical observations
  46. GRB040916 (= H3558): Improved Localization from HETE WXM
  47. GRB040916 (= H3558): A Long XRF Localized by HETE
  48. GRB040912 (= H3557): Chandra Observations Scheduled
  49. GRB 040912: Optical Observations
  50. GRB/XRF040912,optical observations
  51. Optical observations of GRB/XRF 040912 = HETE 3557
  52. GRB040912 : Kiso Optical follow-up observation
  53. Optical observations of field of GRB040912
  54. HETE 3557: Optical observations
  55. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  56. GRB040827: analysis of the XMM-Newton observation
  57. GRB040825A: Optical observations
  58. GRB040825A: Optical observations
  59. GRB 040827: optical and NIR observations at the VLT
  60. GRB 040827: Detection of NIR afterglow
  61. GRB 040827: Possible detection of optical afterglow
  62. GRB 040827: RTT150 optical observations
  63. GRB040825A: optical limit before GRB
  64. MASTER: GRB040827 possible OT
  65. GRB 040825B: Optical observations
  66. GRB040827 optical observations
  67. GRB 040825A,optical observations
  68. GRB040825A: optical observations
  69. GRB040825B: optical observations
  70. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  71. GRB 040825A: Optical observations.
  72. MASTER: GRB040825a optical observation
  73. MASTER: GRB040825b optical observation
  74. GRB 040825: Optical observations
  75. GRB040823,optical observation
  76. XRF 040812: optical observation at VLT
  77. GRB 040812: Optical counterparts of CXO sources
  78. CXO observation of GRB 040812
  79. GRB 040812: Keck and LCO optical observations
  80. GRB040812, optical/IR observations
  81. GRB 040810: Optical observations of a limited region
  82. XRF040701: Optical Observations at ESO
  83. GRB 040730: Optical observations
  84. GRB040624: optical monitoring at TNG
  85. XRF 040701 - optical observations of the decaying Chandra source
  86. GRB040624, optical observations
  87. XRF 040701, optical observations
  88. XRF040701 (=U11548): a bright XRF detected by HETE
  89. GRB 040624: optical observations
  90. Optical Observations of GRB040624
  91. GRB 040624: optical observations at TNG and VLT
  92. MASTER: GRB 040624 optical observation after 0,48d
  93. GRB 040624: R-band observations
  94. GRB 040624, optical observations
  95. GRB 030329: Rebrightening of hyperluminal ejecta.
  96. GRB040511: Retraction of redshift identification
  97. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  98. GRB 040606: Optical observations
  99. MASTER: HETE Alert 3274 optical observation
  100. GRB 040511: NIR observations with REM

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