Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

5516 results found.

  1. Trigger 324561: IGR J08408-4503 detected by Swift
  2. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  3. GRB 080916B, Swift-BAT refined analysis
  4. GRB 080916B: Enhanced Swift-XRT position
  5. GRB 080916B: Swift-XRT afterglow detection
  6. GRB 080915: ROTSE-III Optical Limits
  7. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  8. GRB 080903: Liverpool Telescope observations
  9. GRB 080828: SuperAGILE GRB Localization
  10. SGR 0501+4516: Decline in Activity
  11. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  12. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  13. GLAST Burst Monitor detection of GRB 080817
  14. GRB 080810: Liverpool Telescope observations
  15. GRB 080727B: IR photometry
  16. GRB 080727B: KAIT photometry and an early lightcurve break
  17. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  18. GRB 080603A: CrAO optical observations
  19. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  20. Trigger 316063: Swift detection of a transient
  21. GRB 080701A, VATT optical upper limit
  22. GRB 080701A: Early Super-LOTIS Observations
  23. GRB 0800603A: optical observation
  24. GRB 080603B: TLS Afterglow Observation
  25. GRB 080603B : Liverpool Telescope Observations
  26. GRB 080603B: Swift-XRT refined analysis
  27. GRB 080603B: Swift/UVOT detection of the afterglow
  28. GRB 080603B, Swift-BAT refined analysis
  29. GRB080603B: RTT150 optical observations, break in light curves
  30. GRB 080603B: Swift detection of a burst with optical afterglow
  31. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  32. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  33. GRB 080503: 2nd Epoch Chandra X-ray Observations
  34. GRB 080523, Swift-BAT refined analysis
  35. GRB 080523: Swift detection of a burst
  36. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  37. GRB 080514B, GROND observations
  38. GRB 080506: NAYUTA Optical Observation
  39. GRB 080507: Keck photometry
  40. GRB 080503: MITSuME Ishigakijima optical upper limits
  41. GRB 080503: MITSuME Akeno optical upper limits
  42. GRB 080503: New candidate afterglow/host in Gemini imaging
  43. GRB960202B - on the association with SN 1996cr
  44. Possible GRB 080315: XRT non-detection of afterglow
  45. GRB 080413A: MOA-II optical afterglow observations
  46. GRB080330: MAGIC telescope GeV observation
  47. GRB 080330: RAPTOR detection of prompt optical flash
  48. GRB 080405: Swift-XRT position
  49. GRB 080330: REM optical observations
  50. GRB 080330, SMARTS optical/IR afterglow observations
  51. GRB 080330 Swift-UVOT refined analysis
  52. GRB 080328: Suzaku WAM observation of the prompt emission
  53. Konus-Wind observation of GRB 080328
  54. GRB 080330: GROND Observations
  55. GRB 080330: TAROT Calern observatory optical observations
  56. GRB 080330A: PAIRITEL Infrared Detections
  57. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  58. GRB 080330: Swift detection of a burst with an optical counterpart
  59. GRB 080328: Swift detection of a burst with an optical counterpart
  60. GRB 080319C: UVOT Observations
  61. GRB 080319B: Gemini-South photometry
  62. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  63. GRB 080319b light curve by Pi-of-the-Sky
  64. GRB 080319b: Early IR Imaging from PAIRITEL
  65. Swift Trigger 306745 is not a GRB
  66. GRB 080315: TAROT Calern observatory optical observations
  67. GRB 080310: ROTSE-III Observations of Optical Counterpart
  68. GRB080310: Optical observation by MITSuME telescope
  69. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  70. GRB 080310: Swift-XRT refined analysis
  71. GRB 080310: RRM optical photometry with the VLT
  72. GRB080310: Super-LOTIS suggestion of brightening
  73. GRB 080310, SMARTS optical/IR afterglow observations
  74. GRB080229, optical upper limit (Correction)
  75. GRB080229, optical upper limit
  76. GRB 080307: Early RAPTOR Limits
  77. GRB080307: Optical upper limits
  78. GRB 080303: REM NIR afterglow candidate
  79. ESO optical and NIR observations of GRB 080218B
  80. GRB 080218b, SMARTS optical/IR limits
  81. GRB 080121: Upper limit on X-ray afterglow
  82. GRB 071227: optical afterglow
  83. GRB 071227: Magellan observations
  84. GRB071227: Swift/UVOT refined analysis
  85. GRB 071129: Swift detection of a burst
  86. GRB 071122: Swift detection of a burst
  87. GRB071118 MITSuME OAO optical observation
  88. GRB071109: Super-LOTIS observations
  89. GRB071010b: optical observation
  90. GRB0711101: Two new source from Xinglong TNT observation
  91. GRB 071101: a nearby galaxy
  92. GRB 071031: Swift-XRT Team refined analysis
  93. GRB 071031: GROND detection in all bands
  94. GRB 071031: Swift detection of a burst with an optical counterpart
  95. GRB 071025: Kuiper Telescope Optical Observations
  96. GRB071021: MITSuME Okayama Optical Upper Limits
  97. GRB 071020: Swift-XRT refined analysis
  98. GRB 071020: Swift detection of a bright burst
  99. GRB 071013: TNT optical data refined analysis
  100. GRB 071010B correction to GCN 6892 optical observations

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