Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

37750 results found.

  1. GRB040825A: optical limit before GRB
  2. GRB 040825B: Optical observations
  3. GRB040827 optical observations
  4. GRB 040827 : Planned XMM-Newton observation
  5. GRB 040827 - Refined position
  6. GRB 040827 : peak flux
  7. GRB 040827 - A long GRB detected by INTEGRAL
  8. GRB040825B, BVRcIc field photometry
  9. GRB040825A, BVRcIc field photometry
  10. GCN GRB OBSERBATION REPORT
  11. GRB 040825A,optical observations
  12. Increase of SGR 1806-20 activity
  13. GRB 040825A: Optical observations.
  14. GRB040825B: Correction to GCN 2657
  15. GRB 040825: Optical observations
  16. GRB 040812: Second epoch CXO Observations
  17. GRB040823,optical observation
  18. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  19. XRF 040812: optical observation at VLT
  20. GRB 040812: Optical counterparts of CXO sources
  21. XRF040812: possible afterglow
  22. CXO observation of GRB 040812
  23. IPN/HETE localizations of GRB040810 (=H3489)
  24. GRB 040812: Keck and LCO optical observations
  25. GRB 040812: Keck and LCO observations
  26. GRB 040812: radio observations
  27. GRB040812, optical/IR observations
  28. Konus-Wind observation of GRB040810 (=H3489)
  29. GRB 040812: a long GRB detected by INTEGRAL
  30. GRB 040810: Optical observations of a limited region
  31. IPN/HETE triangulation of GRB040802 (=H3485)
  32. GRB 040730, infrared observations
  33. GRB 040730: Optical observations
  34. GRB 040730: a long GRB detected with INTEGRAL
  35. Ongoing activity of SGR 1806-20
  36. GRB040624: optical monitoring at TNG
  37. Cancellation of IBAS/INTEGRAL GRB alerts
  38. IBAS Alert 1836: NOT a real GRB
  39. GRB040709 J,H-band observations
  40. GRB 040624: optical observations
  41. GRB 040624: optical observations at TNG and VLT
  42. MASTER: GRB 040624 optical observation after 0,48d
  43. GRB 040624: R-band observations
  44. GRB 040624, optical observations
  45. GRB 040624 - A long GRB detected with INTEGRAL
  46. GRB 030329: Rebrightening of hyperluminal ejecta.
  47. IPN Summary of SGR1806-20 Activity in 2004
  48. GRB040511: Retraction of redshift identification
  49. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  50. GRB 040606: Optical observations
  51. MASTER: HETE Alert 3274 optical observation
  52. Activivty of SGR 1806-20
  53. IPN triangulation of an intense intermediate burst from SGR1806-20
  54. GRB 040511, very fast decay?
  55. GRB 030324: Detection and Color of Host Galaxy
  56. GRB 040511: NIR observations with REM
  57. GRB040511: Redshift identifcation
  58. GRB 040511: Optical limit
  59. IBAS GRB Alerts n.1785 to 1791
  60. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  61. GRB 040511: Second Epoch Optical Observations
  62. IBAS GRB Alerts 1781-4
  63. GRB 040511: Optical observations
  64. GRB 040511: Optical Observations
  65. GRB040511: Optical Observations
  66. GRB040511: Optical Observations
  67. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  68. IBAS GRB Alert number 1774: NOT a real GRB
  69. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  70. IBAS Alerts 1771 and 1772: NOT a real GRB
  71. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  72. IPN triangulation of GRB040425 (=H3183)
  73. GRB040422: optical observations at CrAO
  74. GRB 040423 (=H3175): A Long GRB Localized by HETE
  75. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  76. GRB040422, BVRcIc field calibration
  77. GRB 040422,optical observation
  78. GRB 040422: a long GRB detected with INTEGRAL
  79. GRB 040403, deep optical observations
  80. INTEGRAL-SPI/ACS GRB data: timing correction
  81. IBAS GRB alerts 1739, 1740, 1741
  82. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  83. GRB 040403: Optical Observations
  84. GRB 040403 Optical Observations
  85. GRB 040403: Optical observations
  86. GRB 040403: optical observations
  87. GRB 040403: Optical Observations
  88. GRB 040403: a long GRB detected with INTEGRAL
  89. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  90. IBAS GRB Alert 1694
  91. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  92. GRB 040323, a dark GRB ?
  93. short hard GRB 040322
  94. GRB 040323: a long GRB detected with INTEGRAL
  95. IBAS GRB alerts 1679, 1680, 1681
  96. GRB040223: Deep NIR NTT data re-analysis
  97. GRB 040223: XMM-Newton results
  98. GRB040223, improved XMM position
  99. IBAS Alert 1678: not a GRB
  100. GRB 031203: spectoscopic evidence for a 1998bw-like SN

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