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"

37682 results found.

  1. XRF040916, BVRcIc field calibration
  2. GRB040916: Archival optical observations
  3. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  4. GRB040916: Optical observations
  5. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  6. GRB040912 (= H3557): Chandra Observations Scheduled
  7. GRB 040912: Optical Observations
  8. GRB/XRF040912,optical observations
  9. GRB 040912, BVRI observations
  10. Optical observations of GRB/XRF 040912 = HETE 3557
  11. An intense burst from SGR1806-20
  12. IBAS GRB Alerts 1978-1980
  13. Optical observations of field of GRB040912
  14. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  15. GRB 040827: XMM-Newton data
  16. GRB040903 - A XRF?
  17. GRB040827: analysis of the XMM-Newton observation
  18. GRB 040903 - INTEGRAL data analysis
  19. IBAS Alert 1974. Not a real GRB
  20. Very bright burst detected from SGR 1806-20
  21. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  22. Possible GRB 040903 - further analysis
  23. Possible GRB 040903 detected with INTEGRAL
  24. GRB 040827 - Radio Observations
  25. XMM-Newton Images of GRB 040827
  26. GRB 040827: optical and NIR observations at the VLT
  27. GRB 040827: UKIRT - 2nd epoch K-band imaging
  28. GRB 040827: 2nd epoch of Magellan K-band imaging
  29. GRB 040827: K imaging - no evidence of variability
  30. GRB 040827: Detection of NIR afterglow
  31. GRB 040827: Possible detection of optical afterglow
  32. GRB 040827: RTT150 optical observations
  33. GRB040825A: optical limit before GRB
  34. GRB 040825B: Optical observations
  35. GRB040827 optical observations
  36. GRB 040827 : Planned XMM-Newton observation
  37. GRB 040827 - Refined position
  38. GRB 040827 : peak flux
  39. GRB 040827 - A long GRB detected by INTEGRAL
  40. GRB040825B, BVRcIc field photometry
  41. GRB040825A, BVRcIc field photometry
  42. GCN GRB OBSERBATION REPORT
  43. GRB 040825A,optical observations
  44. Increase of SGR 1806-20 activity
  45. GRB 040825A: Optical observations.
  46. GRB040825B: Correction to GCN 2657
  47. GRB 040825: Optical observations
  48. GRB 040812: Second epoch CXO Observations
  49. GRB040823,optical observation
  50. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  51. XRF 040812: optical observation at VLT
  52. GRB 040812: Optical counterparts of CXO sources
  53. XRF040812: possible afterglow
  54. CXO observation of GRB 040812
  55. IPN/HETE localizations of GRB040810 (=H3489)
  56. GRB 040812: Keck and LCO optical observations
  57. GRB 040812: Keck and LCO observations
  58. GRB 040812: radio observations
  59. GRB040812, optical/IR observations
  60. Konus-Wind observation of GRB040810 (=H3489)
  61. GRB 040812: a long GRB detected by INTEGRAL
  62. GRB 040810: Optical observations of a limited region
  63. IPN/HETE triangulation of GRB040802 (=H3485)
  64. GRB 040730, infrared observations
  65. GRB 040730: Optical observations
  66. GRB 040730: a long GRB detected with INTEGRAL
  67. Ongoing activity of SGR 1806-20
  68. GRB040624: optical monitoring at TNG
  69. Cancellation of IBAS/INTEGRAL GRB alerts
  70. IBAS Alert 1836: NOT a real GRB
  71. GRB040709 J,H-band observations
  72. GRB 040624: optical observations
  73. GRB 040624: optical observations at TNG and VLT
  74. MASTER: GRB 040624 optical observation after 0,48d
  75. GRB 040624: R-band observations
  76. GRB 040624, optical observations
  77. GRB 040624 - A long GRB detected with INTEGRAL
  78. GRB 030329: Rebrightening of hyperluminal ejecta.
  79. IPN Summary of SGR1806-20 Activity in 2004
  80. GRB040511: Retraction of redshift identification
  81. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  82. GRB 040606: Optical observations
  83. MASTER: HETE Alert 3274 optical observation
  84. Activivty of SGR 1806-20
  85. IPN triangulation of an intense intermediate burst from SGR1806-20
  86. GRB 040511, very fast decay?
  87. GRB 030324: Detection and Color of Host Galaxy
  88. GRB 040511: NIR observations with REM
  89. GRB040511: Redshift identifcation
  90. GRB 040511: Optical limit
  91. IBAS GRB Alerts n.1785 to 1791
  92. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  93. GRB 040511: Second Epoch Optical Observations
  94. IBAS GRB Alerts 1781-4
  95. GRB 040511: Optical observations
  96. GRB 040511: Optical Observations
  97. GRB040511: Optical Observations
  98. GRB040511: Optical Observations
  99. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  100. IBAS GRB Alert number 1774: NOT a real GRB

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