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"

5183 results found.

  1. GRB 200524A: Fermi-LAT detection
  2. CGBM-SPI-ACS triangulation of short GRB 200521A
  3. GRB 200522A: Swift-XRT refined Analysis
  4. Fermi GRB 200522B: Global MASTER-Net observations report
  5. GRB 200514B: Fermi GBM observation
  6. GRB 200519A: Swift-BAT refined analysis
  7. Fermi trigger No 611676654: Global MASTER-Net observations report
  8. GRB 200519A: Swift-XRT refined Analysis
  9. IPN triangulation of GRB 200514B (short)
  10. Fermi trigger No 611434353: Global MASTER-Net observations report
  11. GRB 200517A: MAXI/GSC detection
  12. GRB 200514A: MITSuME Akeno optical upper limits
  13. GRB 200514A: MAXI/GSC detection
  14. GRB 200512A: Swift-XRT refined Analysis
  15. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  16. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  17. GRB 200506A: Fermi GBM Final Real-time Localization
  18. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  19. SGR 1935+2154: MASTER optical observations
  20. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  21. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  22. A Forest of Bursts from SGR 1935+2154
  23. SGR 1935+2154 the Insight-HXMT observation plan
  24. IceCube-200425A: No significant detection in HAWC
  25. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  26. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  27. GRB 200424A: Swift/UVOT Upper Limits
  28. GRB 200424A: AstroSat CZTI detection
  29. GRB 200425A: Swift-XRT refined Analysis
  30. GRB 200424A: LCO Optical Upper Limit
  31. GRB 200424A: a long GRB detected by INTEGRAL
  32. Fermi GRB 200423A: Global MASTER-Net observations report
  33. Konus-Wind observation of a bright burst from SGR 1935+2154
  34. Fermi GRB 200421A: Global MASTER-Net observations report
  35. IceCube-200421A: No significant detection in HAWC
  36. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  37. Fermi trigger No 608935505: Global MASTER-Net observations report
  38. GRB 200415A: MASTER imspection and possible localisation
  39. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  40. GRB 200416A: Swift-XRT refined Analysis
  41. GRB 200412B: Mondy optical observations
  42. Konus-Wind observation of GRB 200412B
  43. GRB 200412B: Swift-XRT afterglow detection
  44. Fermi GRB 200412A: Global MASTER-Net observations report
  45. Swift GRB 200411A: Global MASTER-Net observations report
  46. GRB 200411A: Swift-XRT refined Analysis
  47. IceCube Alert 200410.97: Global MASTER-Net observations report
  48. Fermi trigger No 608204639: Global MASTER-Net observations report
  49. GRB 200410A: Swift-XRT refined Analysis
  50. Baksan Neutrino Observatory Alert 200408.26: Global MASTER-Net observations report
  51. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  52. GRB 200409A: Swift-XRT refined Analysis
  53. Fermi GRB 200407B: Global MASTER-Net observations report
  54. Fermi GRB 200403A: Global MASTER-Net observations report
  55. LIGO/Virgo S200224ca: Upper limits from Konus-Wind observations
  56. Fermi GRB 200402C: Global MASTER-Net observations report
  57. Fermi GRB 200402A: Global MASTER-Net observations report
  58. Fermi GRB 200401A: Global MASTER-Net observations report
  59. IPN triangulation of GRB 200327A (short)
  60. GRB 200326B: AstroSat LAXPC detection
  61. Fermi trigger No 606799116: Global MASTER-Net observations report
  62. GRB 200326A: Fermi GBM Final Real-time Localization
  63. GRB 200324A: AROMA-N Optical Observation
  64. Fermi trigger No 606840801: Global MASTER-Net observations report
  65. GRB 200324A:: TSHAO optical upper limit
  66. GRB 200324A: Swift-XRT refined Analysis
  67. Swift GRB200324.69: Global MASTER-Net observations report
  68. Fermi trigger No 606681997: Global MASTER-Net observations report
  69. LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
  70. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC observations
  71. LIGO/Virgo S200316bj: No neutrino candidates at Pierre Auger Observatory
  72. LIGO/Virgo S200316bj: No Counterparts in DDOTI/OAN Optical Observations
  73. LIGO/Virgo S200316bj: Coverage and upper limits from MAXI/GSC observations
  74. IPN triangulation of GRB 200313A
  75. Fermi trigger No 605756501: Global MASTER-Net observations report
  76. LIGO/Virgo S200224ca: DESGW Summary of DECam Observations
  77. GRB 200310A: MAXI/GSC detection
  78. Fermi trigger No 605309224: Global MASTER-Net observations report
  79. GRB 200306C: Swift-XRT refined Analysis
  80. GRB 200306A: Swift-XRT refined Analysis
  81. LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
  82. Swift GRB200306.01: Global MASTER-Net observations report
  83. GRB 200303A: Swift-XRT refined Analysis
  84. LIGO/Virgo S200302c: No counterpart candidates in KAIT observations
  85. LIGO/Virgo S200302c: Coverage and upper limits from MAXI/GSC observations
  86. GRB 200228B: Mondy, TSHAO, AbAO and CrAO optical observations, afterglow candidate
  87. LIGO/Virgo S200225q : No significant candidates in TAROT - FRAM - GRANDMA observations.
  88. GRB 200228B: Swift-XRT refined Analysis
  89. GRB 200227A: Swift-XRT refined Analysis
  90. GRB 200224A: Mondy optical upper limit
  91. GRB 200227A: Fermi GBM observation
  92. LIGO/Virgo S200224ca : No significant candidates in TAROT - FRAM - GRANDMA observations
  93. LIGO/Virgo S200224ca: Upper limits from CALET observations.
  94. LIGO/Virgo S200225q: no counterpart candidate in SVOM/GWAC observations
  95. GRB 200224B: DDOTI/OAN optical observations report
  96. LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
  97. LIGO/Virgo S200224ca: GRAWITA-Campo Imperatore observations.
  98. Fermi trigger No 604231129: Global MASTER-Net observations report
  99. LIGO/Virgo S200224ca: Subaru/Hyper Suprime-Cam follow-up observations
  100. LIGO/Virgo S200224ca: No counterpart candidates in Fermi-LAT 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